vpImageConvert.cpp

/****************************************************************************
 *
 * $Id: vpImageConvert.cpp 5204 2015-01-24 13:18:18Z fspindle $
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2014 by INRIA. All rights reserved.
 *
 * This software is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * ("GPL") version 2 as published by the Free Software Foundation.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact INRIA about acquiring a ViSP Professional
 * Edition License.
 *
 * See http://www.irisa.fr/lagadic/visp/visp.html for more information.
 *
 * This software was developed at:
 * INRIA Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 * http://www.irisa.fr/lagadic
 *
 * If you have questions regarding the use of this file, please contact
 * INRIA at visp@inria.fr
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *
 * Description:
 * Convert image types.
 *
 * Authors:
 * Eric Marchand
 * Fabien Spindler
 * Anthony Saunier
 *
 *****************************************************************************/

#include <sstream>

// image
#include <visp/vpImageConvert.h>

bool vpImageConvert::YCbCrLUTcomputed = false;
int vpImageConvert::vpCrr[256];
int vpImageConvert::vpCgb[256];
int vpImageConvert::vpCgr[256];
int vpImageConvert::vpCbb[256];


void
vpImageConvert::convert(const vpImage<unsigned char> &src, vpImage<vpRGBa> & dest)
{
  dest.resize(src.getHeight(), src.getWidth()) ;

  GreyToRGBa(src.bitmap, (unsigned char *)dest.bitmap,
       src.getHeight() * src.getWidth() );
}

void
vpImageConvert::convert(const vpImage<vpRGBa> &src, vpImage<unsigned char> & dest)
{
  dest.resize(src.getHeight(), src.getWidth()) ;

  RGBaToGrey((unsigned char *)src.bitmap, dest.bitmap,
       src.getHeight() * src.getWidth() );
}


void
vpImageConvert::convert(const vpImage<float> &src, vpImage<unsigned char> &dest)
{
  dest.resize(src.getHeight(), src.getWidth()) ;
  unsigned int max_xy = src.getWidth()*src.getHeight();
  float min, max;

  src.getMinMaxValue(min,max);
  
  for (unsigned int i = 0; i < max_xy; i++) {
    float val = 255.f * (src.bitmap[i] - min) / (max - min);
    if(val < 0)
      dest.bitmap[i] = 0;
    else if(val > 255)
      dest.bitmap[i] = 255;
    else
      dest.bitmap[i] = (unsigned char)val;
  }
}

void
vpImageConvert::convert(const vpImage<unsigned char> &src, vpImage<float> &dest)
{
  dest.resize(src.getHeight(), src.getWidth()) ;
  for (unsigned int i = 0; i < src.getHeight()*src.getWidth(); i++)
    dest.bitmap[i] = (float)src.bitmap[i];
}

void
vpImageConvert::convert(const vpImage<double> &src, vpImage<unsigned char> &dest)
{
  dest.resize(src.getHeight(), src.getWidth()) ;
  unsigned int max_xy = src.getWidth()*src.getHeight();
  double min, max;

  src.getMinMaxValue(min,max);
  
  for (unsigned int i = 0; i < max_xy; i++) {
    double val = 255. * (src.bitmap[i] - min) / (max - min);
    if(val < 0)
      dest.bitmap[i] = 0;
    else if(val > 255)
      dest.bitmap[i] = 255;
    else
      dest.bitmap[i] = (unsigned char)val;
  }
}

void
vpImageConvert::convert(const vpImage<unsigned char> &src, vpImage<double> &dest)
{
  dest.resize(src.getHeight(), src.getWidth()) ;
  for (unsigned int i = 0; i < src.getHeight()*src.getWidth(); i++)
    dest.bitmap[i] = (double)src.bitmap[i];
}

#ifdef VISP_HAVE_OPENCV
// Deprecated: will be removed with OpenCV transcient from C to C++ api
void
vpImageConvert::convert(const IplImage* src, vpImage<vpRGBa> & dest, bool flip)
{
  int nChannel = src->nChannels;
  int depth = src->depth;
  int height = src->height;
  int width = src->width;
  int widthStep = src->widthStep;
  int lineStep = (flip) ? 1 : 0;

  if(nChannel == 3 && depth == 8){
    dest.resize((unsigned int)height, (unsigned int)width);

    //starting source address
    unsigned char* input = (unsigned char*)src->imageData;
    unsigned char* line;
    unsigned char* beginOutput = (unsigned char*)dest.bitmap;
    unsigned char* output = NULL;

    for(int i=0 ; i < height ; i++)
    {
      line = input;
      output = beginOutput + lineStep * ( 4 * width * ( height - 1 - i ) ) + (1-lineStep) * 4 * width * i;
      for(int j=0 ; j < width ; j++)
        {
          *(output++) = *(line+2);
          *(output++) = *(line+1);
          *(output++) = *(line);
          *(output++) = 0;

          line+=3;
        }
      //go to the next line
      input+=widthStep;
    }
  }
  else if(nChannel == 1 && depth == 8 ){
    dest.resize((unsigned int)height, (unsigned int)width);
    //starting source address
    unsigned char * input = (unsigned char*)src->imageData;
    unsigned char * line;
    unsigned char* beginOutput = (unsigned char*)dest.bitmap;
    unsigned char* output = NULL;

    for(int i=0 ; i < height ; i++)
    {
      line = input;
      output = beginOutput + lineStep * ( 4 * width * ( height - 1 - i ) ) + (1-lineStep) * 4 * width * i;
      for(int j=0 ; j < width ; j++)
        {
          *output++ = *(line);
          *output++ = *(line);
          *output++ = *(line);
          *output++ = *(line);;

          line++;
        }
      //go to the next line
      input+=widthStep;
    }
  }
}

void
vpImageConvert::convert(const IplImage* src, vpImage<unsigned char> &dest, bool flip)
{
  int nChannel = src->nChannels;
  int depth = src->depth;
  int height = src->height;
  int width = src->width;
  int widthStep = src->widthStep;
  int lineStep = (flip) ? 1 : 0;

  if (flip == false)
  {
    if(widthStep == width){
      if(nChannel == 1 && depth == 8){
        dest.resize((unsigned int)height, (unsigned int)width) ;
        memcpy(dest.bitmap, src->imageData,
                (size_t)(height*width));
      }
      if(nChannel == 3 && depth == 8){
        dest.resize((unsigned int)height, (unsigned int)width) ;
        BGRToGrey((unsigned char*)src->imageData,dest.bitmap, (unsigned int)width, (unsigned int)height,false);
      }
    }
    else{
      if(nChannel == 1 && depth == 8){
        dest.resize((unsigned int)height, (unsigned int)width) ;
        for (int i =0  ; i < height ; i++){
          memcpy(dest.bitmap+i*width, src->imageData + i*widthStep,
                (size_t)width);
        }
      }
      if(nChannel == 3 && depth == 8){
        dest.resize((unsigned int)height, (unsigned int)width) ;
        for (int i = 0  ; i < height ; i++){
          BGRToGrey((unsigned char*)src->imageData + i*widthStep,
                      dest.bitmap + i*width, (unsigned int)width, 1, false);
        }
      }
    }
  }
  else
  {
    if(nChannel == 1 && depth == 8){
      dest.resize((unsigned int)height, (unsigned int)width) ;
      unsigned char* beginOutput = (unsigned char*)dest.bitmap;
      for (int i =0  ; i < height ; i++){
        memcpy(beginOutput + lineStep * ( 4 * width * ( height - 1 - i ) ) , src->imageData + i*widthStep,
               (size_t)width);
      }
    }
    if(nChannel == 3 && depth == 8){
      dest.resize((unsigned int)height, (unsigned int)width) ;
      //for (int i = 0  ; i < height ; i++){
      BGRToGrey((unsigned char*)src->imageData /*+ i*widthStep*/,
                dest.bitmap /*+ i*width*/, (unsigned int)width, (unsigned int)height/*1*/, true);
      //}
    }
  }
}

void
vpImageConvert::convert(const vpImage<vpRGBa> & src, IplImage *&dest)
{
  int height = (int)src.getHeight();
  int width  = (int)src.getWidth();
  CvSize size = cvSize(width, height);
  int depth = 8;
  int channels = 3;
  if (dest != NULL){
    if(dest->nChannels != channels || dest->depth != depth
       || dest->height != height || dest->width != width){
      if(dest->nChannels != 0) cvReleaseImage(&dest);
      dest = cvCreateImage( size, depth, channels );
    }
  }
  else dest = cvCreateImage( size, depth, channels );


  //starting source address
  unsigned char * input = (unsigned char*)src.bitmap;//rgba image
  unsigned char * line;
  unsigned char * output = (unsigned char*)dest->imageData;//bgr image

  int j=0;
  int i=0;
  int widthStep = dest->widthStep;

  for(i=0 ; i < height ; i++)
  {
    output = (unsigned char*)dest->imageData + i*widthStep;
    line = input;
    for( j=0 ; j < width ; j++)
      {
        *output++ = *(line+2);  //B
        *output++ = *(line+1);  //G
        *output++ = *(line);  //R

        line+=4;
      }
    //go to the next line
    input+=4*width;
  }
}

void
vpImageConvert::convert(const vpImage<unsigned char> & src, IplImage* &dest)
{
  unsigned int height = src.getHeight();
  unsigned int width  = src.getWidth();
  CvSize size = cvSize((int)width, (int)height);
  int depth = 8;
  int channels = 1;
  if (dest != NULL){
    if(dest->nChannels != channels || dest->depth != depth
       || dest->height != (int) height || dest->width != (int) width){
      if(dest->nChannels != 0) cvReleaseImage(&dest);
      dest = cvCreateImage( size, depth, channels );
    }
  }
  else dest = cvCreateImage( size, depth, channels );

  unsigned int widthStep = (unsigned int)dest->widthStep;

  if ( width == widthStep){
    memcpy(dest->imageData,src.bitmap, width*height);
  }
  else{
    //copying each line taking account of the widthStep
    for (unsigned int i =0  ; i < height ; i++){
          memcpy(dest->imageData + i*widthStep, src.bitmap + i*width,
                width);
    }
  }
}

#if VISP_HAVE_OPENCV_VERSION >= 0x020100

void
vpImageConvert::convert(const cv::Mat& src, vpImage<vpRGBa>& dest, const bool flip)
{
  if(src.type() == CV_8UC4){
    dest.resize((unsigned int)src.rows, (unsigned int)src.cols);
    vpRGBa rgbaVal;
    for(unsigned int i=0; i<dest.getRows(); ++i)
      for(unsigned int j=0; j<dest.getCols(); ++j){
        cv::Vec4b tmp = src.at<cv::Vec4b>((int)i, (int)j);
        rgbaVal.R = tmp[2];
        rgbaVal.G = tmp[1];
        rgbaVal.B = tmp[0];
        rgbaVal.A = tmp[3];
        if(flip)
          dest[dest.getRows()-i-1][j] = rgbaVal;
        else
          dest[i][j] = rgbaVal;
      }
  }else if(src.type() == CV_8UC3){
    dest.resize((unsigned int)src.rows, (unsigned int)src.cols);
    vpRGBa rgbaVal;
    rgbaVal.A = 0;
    for(unsigned int i=0; i<dest.getRows(); ++i){
      for(unsigned int j=0; j<dest.getCols(); ++j){
        cv::Vec3b tmp = src.at<cv::Vec3b>((int)i, (int)j);
        rgbaVal.R = tmp[2];
        rgbaVal.G = tmp[1];
        rgbaVal.B = tmp[0];
        if(flip){
          dest[dest.getRows()-i-1][j] = rgbaVal;
        }else{
          dest[i][j] = rgbaVal;
        }
      }
    }
  }else if(src.type() == CV_8UC1){
    dest.resize((unsigned int)src.rows, (unsigned int)src.cols);
    vpRGBa rgbaVal;
    for(unsigned int i=0; i<dest.getRows(); ++i){
      for(unsigned int j=0; j<dest.getCols(); ++j){
        rgbaVal = src.at<unsigned char>((int)i, (int)j);
        if(flip){
          dest[dest.getRows()-i-1][j] = rgbaVal;
        }else{
          dest[i][j] = rgbaVal;
        }
      }
    }
  }
}

void
vpImageConvert::convert(const cv::Mat& src, vpImage<unsigned char>& dest, const bool flip)
{
  if(src.type() == CV_8UC1){
    dest.resize((unsigned int)src.rows, (unsigned int)src.cols);
    if(src.isContinuous() && !flip){
      memcpy(dest.bitmap, src.data, (size_t)(src.rows*src.cols));
    }
    else{
      if(flip){
        for(unsigned int i=0; i<dest.getRows(); ++i){
          memcpy(dest.bitmap+i*dest.getCols(), src.data+(dest.getRows()-i-1)*src.step1(), (size_t)src.step);
        }
      }else{
        for(unsigned int i=0; i<dest.getRows(); ++i){
          memcpy(dest.bitmap+i*dest.getCols(), src.data+i*src.step1(), (size_t)src.step);
        }
      }
    }
  }else if(src.type() == CV_8UC3){
    dest.resize((unsigned int)src.rows, (unsigned int)src.cols);
    if(src.isContinuous() && !flip){
      BGRToGrey((unsigned char*)src.data, (unsigned char*)dest.bitmap, (unsigned int)src.cols, (unsigned int)src.rows, flip);
    }
    else{
      if(flip){
        for(unsigned int i=0; i<dest.getRows(); ++i){
          BGRToGrey((unsigned char*)src.data+i*src.step1(),
                    (unsigned char*)dest.bitmap+(dest.getRows()-i-1)*dest.getCols(),
                    (unsigned int)dest.getCols(), 1, false);
        }
      }else{
        for(unsigned int i=0; i<dest.getRows(); ++i){
          BGRToGrey((unsigned char*)src.data+i*src.step1(),
                    (unsigned char*)dest.bitmap+i*dest.getCols(),
                    (unsigned int)dest.getCols(), 1, false);
        }
      }
    }
  }
}


void
vpImageConvert::convert(const vpImage<vpRGBa> & src, cv::Mat& dest)
{
  cv::Mat vpToMat((int)src.getRows(), (int)src.getCols(), CV_8UC4, (void*)src.bitmap);

  dest = cv::Mat((int)src.getRows(), (int)src.getCols(), CV_8UC3);
  cv::Mat alpha((int)src.getRows(), (int)src.getCols(), CV_8UC1);

  cv::Mat out[] = {dest, alpha};
  int from_to[] = { 0,2,  1,1,  2,0,  3,3 };
  cv::mixChannels(&vpToMat, 1, out, 2, from_to, 4);
}

void
vpImageConvert::convert(const vpImage<unsigned char> & src, cv::Mat& dest, const bool copyData)
{
  if(copyData){
    cv::Mat tmpMap((int)src.getRows(), (int)src.getCols(), CV_8UC1, (void*)src.bitmap);
    dest = tmpMap.clone();
  }else{
    dest = cv::Mat((int)src.getRows(), (int)src.getCols(), CV_8UC1, (void*)src.bitmap);
  }
}

#endif
#endif

#ifdef VISP_HAVE_YARP

void vpImageConvert::convert(const vpImage<unsigned char> & src,
                             yarp::sig::ImageOf< yarp::sig::PixelMono > *dest, const bool copyData)
{
  if(copyData)
  {
    dest->resize(src.getWidth(),src.getHeight());
    memcpy(dest->getRawImage(), src.bitmap, src.getHeight()*src.getWidth());
  }
  else
    dest->setExternal(src.bitmap, (int)src.getCols(), (int)src.getRows());
}

void vpImageConvert::convert(const yarp::sig::ImageOf< yarp::sig::PixelMono > *src,
                             vpImage<unsigned char> & dest,const bool copyData)
{
  dest.resize(src->height(),src->width());
  if(copyData)
    memcpy(dest.bitmap, src->getRawImage(), src->height()*src->width()*sizeof(yarp::sig::PixelMono));
  else
    dest.bitmap = src->getRawImage();
}
    
void vpImageConvert::convert(const vpImage<vpRGBa> & src,
                             yarp::sig::ImageOf< yarp::sig::PixelRgba > *dest, const bool copyData)
{
  if(copyData){
    dest->resize(src.getWidth(),src.getHeight());
    memcpy(dest->getRawImage(), src.bitmap, src.getHeight()*src.getWidth()*sizeof(vpRGBa));
  }
  else
    dest->setExternal(src.bitmap, (int)src.getCols(), (int)src.getRows());
}

void vpImageConvert::convert(const yarp::sig::ImageOf< yarp::sig::PixelRgba > *src,
                             vpImage<vpRGBa> & dest,const bool copyData)
{
  dest.resize(src->height(),src->width());
  if(copyData)
    memcpy(dest.bitmap, src->getRawImage(),src->height()*src->width()*sizeof(yarp::sig::PixelRgba));
  else
    dest.bitmap = (vpRGBa*)src->getRawImage();
}

void vpImageConvert::convert(const vpImage<vpRGBa> & src, yarp::sig::ImageOf< yarp::sig::PixelRgb > *dest)
{
  dest->resize(src.getWidth(),src.getHeight());
  for(unsigned int i = 0 ; i < src.getRows() ; i++){
    for(unsigned int j = 0 ; j < src.getWidth() ; j++){
    dest->pixel(j,i).r = src[i][j].R;
    dest->pixel(j,i).g = src[i][j].G;
    dest->pixel(j,i).b = src[i][j].B;
    }
  }
}

void vpImageConvert::convert(const yarp::sig::ImageOf< yarp::sig::PixelRgb > *src, vpImage<vpRGBa> & dest)
{
  dest.resize(src->height(),src->width());
  for(int i = 0 ; i < src->height() ; i++){
    for(int j = 0 ; j < src->width() ; j++){
    dest[i][j].R = src->pixel(j,i).r;
    dest[i][j].G = src->pixel(j,i).g;
    dest[i][j].B = src->pixel(j,i).b;
    dest[i][j].A = 0;
    }
  }
}

#endif

#if defined(VISP_HAVE_LIBJPEG)
#if JPEG_LIB_VERSION > 70

void vpImageConvert::convertToJPEGBuffer(const vpImage<unsigned char> &src, 
                                         unsigned char **dest, long unsigned int &destSize, int quality)
{
  struct jpeg_compress_struct cinfo;
  struct jpeg_error_mgr jerr;

  cinfo.err = jpeg_std_error(&jerr);
  jpeg_create_compress(&cinfo);
  
  *dest = NULL;
  destSize = 0;
  
  jpeg_mem_dest(&cinfo, dest, &destSize);

  unsigned int width = src.getWidth();
  unsigned int height = src.getHeight();

  cinfo.image_width = width;
  cinfo.image_height = height;
  cinfo.input_components = 1;
  cinfo.in_color_space = JCS_GRAYSCALE;
  jpeg_set_defaults(&cinfo);
  jpeg_set_quality(&cinfo, quality, TRUE);

  jpeg_start_compress(&cinfo,TRUE);

  unsigned char *line;
  line = new unsigned char[width];
  unsigned char* input = (unsigned char*)src.bitmap;
  while (cinfo.next_scanline < cinfo.image_height)
  {
    for (unsigned int i = 0; i < width; i++)
    {
      line[i] = *(input);
    input++;
    }
  jpeg_write_scanlines(&cinfo, &line, 1);
  }

  jpeg_finish_compress(&cinfo);
  jpeg_destroy_compress(&cinfo);
  delete [] line;
}
  
void vpImageConvert::convertToJPEGBuffer(unsigned char *src, long unsigned int srcSize, 
                                         vpImage<unsigned char> &dest)
{
  struct jpeg_decompress_struct cinfo;
  struct jpeg_error_mgr jerr;

  cinfo.err = jpeg_std_error(&jerr);
  jpeg_create_decompress(&cinfo);

  jpeg_mem_src(&cinfo, src, srcSize);
  jpeg_read_header(&cinfo, TRUE);

  unsigned int width = cinfo.image_width;
  unsigned int height = cinfo.image_height;

  if ( (width != dest.getWidth()) || (height != dest.getHeight()) )
    dest.resize(height,width);

  jpeg_start_decompress(&cinfo);

  unsigned int rowbytes = cinfo.output_width * (unsigned int)(cinfo.output_components);
  JSAMPARRAY buf = (*cinfo.mem->alloc_sarray) ((j_common_ptr) &cinfo, JPOOL_IMAGE, rowbytes, 1);

  if (cinfo.out_color_space == JCS_GRAYSCALE)
  {
    unsigned int row;
    while (cinfo.output_scanline<cinfo.output_height)
    {
      row = cinfo.output_scanline;
      jpeg_read_scanlines(&cinfo,buf,1);
      memcpy(dest[row], buf[0], rowbytes);
    }
  }

  jpeg_finish_decompress(&cinfo);
  jpeg_destroy_decompress(&cinfo);
}
#endif
#endif // defined(VISP_HAVE_LIBJPEG)


#define vpSAT(c) \
        if (c & (~255)) { if (c < 0) c = 0; else c = 255; }

void vpImageConvert::YUYVToRGBa(unsigned char* yuyv, unsigned char* rgba,
                                unsigned int width, unsigned int height)
{
  unsigned char *s;
  unsigned char *d;
  int w, h, c;
  int r, g, b, cr, cg, cb, y1, y2;

  h = (int)height;
  w = (int)width;
  s = yuyv;
  d = rgba;
  while (h--) {
    c = w >> 1;
    while (c--) {
      y1 = *s++;
      cb = ((*s - 128) * 454) >> 8;
      cg = (*s++ - 128) * 88;
      y2 = *s++;
      cr = ((*s - 128) * 359) >> 8;
      cg = (cg + (*s++ - 128) * 183) >> 8;

      r = y1 + cr;
      b = y1 + cb;
      g = y1 - cg;
      vpSAT(r);
      vpSAT(g);
      vpSAT(b);

      *d++ = static_cast<unsigned char>(r);
      *d++ = static_cast<unsigned char>(g);
      *d++ = static_cast<unsigned char>(b);
      *d++ = 0;

      r = y2 + cr;
      b = y2 + cb;
      g = y2 - cg;
      vpSAT(r);
      vpSAT(g);
      vpSAT(b);

      *d++ = static_cast<unsigned char>(r);
      *d++ = static_cast<unsigned char>(g);
      *d++ = static_cast<unsigned char>(b);
      *d++ = 0;

    }
  }
}
void vpImageConvert::YUYVToRGB(unsigned char* yuyv, unsigned char* rgb,
                               unsigned int width, unsigned int height)
{
  unsigned char *s;
  unsigned char *d;
  int h, w, c;
  int r, g, b, cr, cg, cb, y1, y2;

  h = (int)height;
  w = (int)width;
  s = yuyv;
  d = rgb;
  while (h--) {
    c = w >> 1;
    while (c--) {
      y1 = *s++;
      cb = ((*s - 128) * 454) >> 8;
      cg = (*s++ - 128) * 88;
      y2 = *s++;
      cr = ((*s - 128) * 359) >> 8;
      cg = (cg + (*s++ - 128) * 183) >> 8;

      r = y1 + cr;
      b = y1 + cb;
      g = y1 - cg;
      vpSAT(r);
      vpSAT(g);
      vpSAT(b);

      *d++ = static_cast<unsigned char>(r);
      *d++ = static_cast<unsigned char>(g);
      *d++ = static_cast<unsigned char>(b);

      r = y2 + cr;
      b = y2 + cb;
      g = y2 - cg;
      vpSAT(r);
      vpSAT(g);
      vpSAT(b);

      *d++ = static_cast<unsigned char>(r);
      *d++ = static_cast<unsigned char>(g);
      *d++ = static_cast<unsigned char>(b);
    }
  }
}
void vpImageConvert::YUYVToGrey(unsigned char* yuyv, unsigned char* grey, unsigned int size)
{
  unsigned int i=0,j=0;

  while( j < size*2)
    {
      grey[i++] = yuyv[j];
      grey[i++] = yuyv[j+2];
      j+=4;
    }
}


void vpImageConvert::YUV411ToRGBa(unsigned char* yuv, unsigned char* rgba, unsigned int size)
{
#if 1
  //  std::cout << "call optimized ConvertYUV411ToRGBa()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1, Y2, Y3;
  for(unsigned int i = size / 4; i; i--) {
    U   = (int)((*yuv++ - 128) * 0.354);
    U5  = 5*U;
    Y0  = *yuv++;
    Y1  = *yuv++;
    V   = (int)((*yuv++ - 128) * 0.707);
    V2  = 2*V;
    Y2  = *yuv++;
    Y3  = *yuv++;
    UV  = - U - V;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    rgba++;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    rgba++;

    //---
    R = Y2 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y2 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y2 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    rgba++;

    //---
    R = Y3 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y3 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y3 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    rgba++;
  }
#else
  // tres tres lent ....
  unsigned int i=0,j=0;
  unsigned char r, g, b;
  while( j < numpixels*3/2)
  {

    YUVToRGB (yuv[j+1], yuv[j], yuv[j+3], r, g, b);
    rgba[i]   = r;
    rgba[i+1] = g;
    rgba[i+2] = b;
    rgba[i+3] = 0;
    i+=4;

    YUVToRGB (yuv[j+2], yuv[j], yuv[j+3], r, g, b);
    rgba[i]   = r;
    rgba[i+1] = g;
    rgba[i+2] = b;
    rgba[i+3] = 0;
    i+=4;

    YUVToRGB (yuv[j+4], yuv[j], yuv[j+3], r, g, b);
    rgba[i]   = r;
    rgba[i+1] = g;
    rgba[i+2] = b;
    rgba[i+3] = 0;
    i+=4;

    YUVToRGB (yuv[j+5], yuv[j], yuv[j+3], r, g, b);
    rgba[i]   = r;
    rgba[i+1] = g;
    rgba[i+2] = b;
    rgba[i+3] = 0;
    i+=4;

    j+=6;
  }
#endif

}

void vpImageConvert::YUV422ToRGBa(unsigned char* yuv, unsigned char* rgba, unsigned int size)
{

#if 1
  //  std::cout << "call optimized convertYUV422ToRGBa()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1;
  for( unsigned int i = size / 2; i; i-- ) {
    U   = (int)((*yuv++ - 128) * 0.354);
    U5  = 5*U;
    Y0  = *yuv++;
    V   = (int)((*yuv++ - 128) * 0.707);
    V2  = 2*V;
    Y1  = *yuv++;
    UV  = - U - V;

    //---
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    rgba++;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    rgba++;
  }

#else
  // tres tres lent ....
 unsigned int i=0,j=0;
 unsigned char r, g, b;

 while( j < size*2)
 {

   YUVToRGB (yuv[j+1], yuv[j], yuv[j+2], r, g, b);
   rgba[i]   = r;
   rgba[i+1] = g;
   rgba[i+2] = b;
   rgba[i+3] = 0;
   i+=4;

   YUVToRGB (yuv[j+3], yuv[j], yuv[j+2], r, g, b);
   rgba[i]   = r;
   rgba[i+1] = g;
   rgba[i+2] = b;
   rgba[i+3] = 0;
   i+=4;
   j+=4;

 }
#endif
}

void vpImageConvert::YUV411ToGrey(unsigned char* yuv, unsigned char* grey, unsigned int size)
{
  unsigned int i=0,j=0;
  while( j < size*3/2)
  {

    grey[i  ] = yuv[j+1];
    grey[i+1] = yuv[j+2];
    grey[i+2] = yuv[j+4];
    grey[i+3] = yuv[j+5];

    i+=4;

    j+=6;
  }
}

void vpImageConvert::YUV422ToRGB(unsigned char* yuv, unsigned char* rgb, unsigned int size)
{
#if 1
  //  std::cout << "call optimized convertYUV422ToRGB()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1;
  for( unsigned int i = size / 2; i; i-- ) {
    U   = (int)((*yuv++ - 128) * 0.354);
    U5  = 5*U;
    Y0  = *yuv++;
    V   = (int)((*yuv++ - 128) * 0.707);
    V2  = 2*V;
    Y1  = *yuv++;
    UV  = - U - V;

    //---
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

  }

#else
  // tres tres lent ....
 unsigned int i=0,j=0;
 unsigned char r, g, b;

 while( j < size*2)
 {

   YUVToRGB (yuv[j+1], yuv[j], yuv[j+2], r, g, b);
   rgb[i]   = r;
   rgb[i+1] = g;
   rgb[i+2] = b;
   i+=3;

   YUVToRGB (yuv[j+3], yuv[j], yuv[j+2], r, g, b);
   rgb[i]   = r;
   rgb[i+1] = g;
   rgb[i+2] = b;
   i+=3;
   j+=4;

 }
#endif
}

void vpImageConvert::YUV422ToGrey(unsigned char* yuv, unsigned char* grey, unsigned int size)
{
 unsigned int i=0,j=0;

 while( j < size*2)
 {
   grey[i++] = yuv[j+1];
   grey[i++] = yuv[j+3];
   j+=4;
 }
}

void vpImageConvert::YUV411ToRGB(unsigned char* yuv, unsigned char* rgb, unsigned int size)
{
#if 1
  //  std::cout << "call optimized ConvertYUV411ToRGB()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1, Y2, Y3;
  for(unsigned int i = size / 4; i; i--) {
    U   = (int)((*yuv++ - 128) * 0.354);
    U5  = 5*U;
    Y0  = *yuv++;
    Y1  = *yuv++;
    V   = (int)((*yuv++ - 128) * 0.707);
    V2  = 2*V;
    Y2  = *yuv++;
    Y3  = *yuv++;
    UV  = - U - V;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y2 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y2 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y2 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y3 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y3 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y3 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;
  }
#else
  // tres tres lent ....

  unsigned int i=0,j=0;
  unsigned char r, g, b;

  while( j < size*3/2)
  {
    YUVToRGB (yuv[j+1], yuv[j], yuv[j+3], r, g, b);
    rgb[i]   = r;
    rgb[i+1] = g;
    rgb[i+2] = b;
    i+=3;

    YUVToRGB (yuv[j+2], yuv[j], yuv[j+3], r, g, b);
    rgb[i]   = r;
    rgb[i+1] = g;
    rgb[i+2] = b;
    i+=3;

    YUVToRGB (yuv[j+4], yuv[j], yuv[j+3], r, g, b);
    rgb[i]   = r;
    rgb[i+1] = g;
    rgb[i+2] = b;
    i+=3;

    YUVToRGB (yuv[j+5], yuv[j], yuv[j+3], r, g, b);
    rgb[i]   = r;
    rgb[i+1] = g;
    rgb[i+2] = b;
    i+=3;
    //TRACE("r= %d g=%d b=%d", r, g, b);

    j+=6;
  }
#endif

}



void vpImageConvert::YUV420ToRGBa(unsigned char* yuv, unsigned char* rgba,
                                  unsigned int width, unsigned int height)
{
  //  std::cout << "call optimized ConvertYUV420ToRGBa()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1, Y2, Y3;
  unsigned int size = width*height;
  unsigned char* iU = yuv + size;
  unsigned char* iV = yuv + 5*size/4;
  for(unsigned int i = 0; i<height/2; i++)
  {
  for(unsigned int j = 0; j < width/2 ; j++)
    {
    U   = (int)((*iU++ - 128) * 0.354);
    U5  = 5*U;
    V   = (int)((*iV++ - 128) * 0.707);
    V2  = 2*V;
    UV  = - U - V;
    Y0  = *yuv++;
    Y1  = *yuv;
    yuv = yuv+width-1;
    Y2  = *yuv++;
    Y3  = *yuv;
    yuv = yuv-width+1;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba = 0;
    rgba = rgba + 4*width-7;

    //---
    R = Y2 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y2 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y2 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y3 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y3 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y3 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba = 0;
    rgba = rgba -4*width+1;
    }
  yuv+=width;
  rgba+=4*width;
  }
}
void vpImageConvert::YUV420ToRGB(unsigned char* yuv,
                                 unsigned char* rgb,
                                 unsigned int width, unsigned int height)
{
  //  std::cout << "call optimized ConvertYUV420ToRGB()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1, Y2, Y3;
  unsigned int size = width*height;
  unsigned char* iU = yuv + size;
  unsigned char* iV = yuv + 5*size/4;
  for(unsigned int i = 0; i<height/2; i++)
  {
  for(unsigned int j = 0; j < width/2 ; j++)
    {
    U   = (int)((*iU++ - 128) * 0.354);
    U5  = 5*U;
    V   = (int)((*iV++ - 128) * 0.707);
    V2  = 2*V;
    UV  = - U - V;
    Y0  = *yuv++;
    Y1  = *yuv;
    yuv = yuv+width-1;
    Y2  = *yuv++;
    Y3  = *yuv;
    yuv = yuv-width+1;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb = (unsigned char)B;
    rgb = rgb + 3*width-5;

    //---
    R = Y2 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y2 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y2 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y3 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y3 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y3 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb = (unsigned char)B;
    rgb = rgb -3*width+1;
    }
  yuv+=width;
  rgb+=3*width;
  }
}

void vpImageConvert::YUV420ToGrey(unsigned char* yuv, unsigned char* grey, unsigned int size)
{
  for(unsigned int i=0 ; i < size ; i++)
  {
    *grey++ = *yuv++;
  }

}
void vpImageConvert::YUV444ToRGBa(unsigned char* yuv, unsigned char* rgba, unsigned int size)
{
  register int U, V, R, G, B, V2, U5, UV;
  register int Y;
  for(unsigned int i = 0; i<size; i++)
  {
    U   = (int)((*yuv++ - 128) * 0.354);
    U5  = 5*U;
    Y   = *yuv++;
    V   = (int)((*yuv++ - 128) * 0.707);
    V2  = 2*V;
    UV  = - U - V;


    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;
  }
}
void vpImageConvert::YUV444ToRGB(unsigned char* yuv, unsigned char* rgb, unsigned int size)
{
  register int U, V, R, G, B, V2, U5, UV;
  register int Y;
  for(unsigned int i = 0; i<size; i++)
  {

    U   = (int)((*yuv++ - 128) * 0.354);
    U5  = 5*U;
    Y   = *yuv++;
    V   = (int)((*yuv++ - 128) * 0.707);
    V2  = 2*V;
    UV  = - U - V;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;
  }
}

void vpImageConvert::YUV444ToGrey(unsigned char* yuv, unsigned char* grey, unsigned int size)
{
  yuv++;
  for(unsigned int i=0 ; i < size ; i++)
  {
    *grey++ = *yuv;
    yuv = yuv + 3;
  }
}

void vpImageConvert::YV12ToRGBa(unsigned char* yuv, unsigned char* rgba,
                                unsigned int width, unsigned int height)
{
  //  std::cout << "call optimized ConvertYV12ToRGBa()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1, Y2, Y3;
  unsigned int size = width*height;
  unsigned char* iV = yuv + size;
  unsigned char* iU = yuv + 5*size/4;
  for(unsigned int i = 0; i<height/2; i++)
  {
  for(unsigned int j = 0; j < width/2 ; j++)
    {
    U   = (int)((*iU++ - 128) * 0.354);
    U5  = 5*U;
    V   = (int)((*iV++ - 128) * 0.707);
    V2  = 2*V;
    UV  = - U - V;
    Y0  = *yuv++;
    Y1  = *yuv;
    yuv = yuv+width-1;
    Y2  = *yuv++;
    Y3  = *yuv;
    yuv = yuv-width+1;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba = 0;
    rgba = rgba + 4*width-7;

    //---
    R = Y2 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y2 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y2 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y3 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y3 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y3 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba = 0;
    rgba = rgba -4*width+1;
    }
  yuv+=width;
  rgba+=4*width;
  }
}
void vpImageConvert::YV12ToRGB(unsigned char* yuv, unsigned char* rgb,
                               unsigned int height, unsigned int width)
{
  //  std::cout << "call optimized ConvertYV12ToRGB()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1, Y2, Y3;
  unsigned int size = width*height;
  unsigned char* iV = yuv + size;
  unsigned char* iU = yuv + 5*size/4;
  for(unsigned int i = 0; i<height/2; i++)
  {
  for(unsigned int j = 0; j < width/2 ; j++)
    {
    U   = (int)((*iU++ - 128) * 0.354);
    U5  = 5*U;
    V   = (int)((*iV++ - 128) * 0.707);
    V2  = 2*V;
    UV  = - U - V;
    Y0  = *yuv++;
    Y1  = *yuv;
    yuv = yuv+width-1;
    Y2  = *yuv++;
    Y3  = *yuv;
    yuv = yuv-width+1;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb = (unsigned char)B;
    rgb = rgb + 3*width-5;

    //---
    R = Y2 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y2 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y2 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y3 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y3 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y3 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb = (unsigned char)B;
    rgb = rgb -3*width+1;
    }
  yuv+=width;
  rgb+=3*width;
  }
}

void vpImageConvert::YVU9ToRGBa(unsigned char* yuv, unsigned char* rgba,
                                unsigned int width, unsigned int height)
{
  //  std::cout << "call optimized ConvertYVU9ToRGBa()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1, Y2, Y3,Y4, Y5, Y6, Y7,Y8, Y9, Y10, Y11,Y12, Y13, Y14, Y15;
  unsigned int size = width*height;
  unsigned char* iV = yuv + size;
  unsigned char* iU = yuv + 17*size/16;
  for(unsigned int i = 0; i<height/4; i++)
  {
  for(unsigned int j = 0; j < width/4 ; j++)
    {
    U   = (int)((*iU++ - 128) * 0.354);
    U5  = 5*U;
    V   = (int)((*iV++ - 128) * 0.707);
    V2  = 2*V;
    UV  = - U - V;
    Y0  = *yuv++;
    Y1  = *yuv++;
    Y2  = *yuv++;
    Y3  = *yuv;
    yuv = yuv+width-3;
    Y4  = *yuv++;
    Y5  = *yuv++;
    Y6  = *yuv++;
    Y7  = *yuv;
    yuv = yuv+width-3;
    Y8  = *yuv++;
    Y9  = *yuv++;
    Y10  = *yuv++;
    Y11  = *yuv;
    yuv = yuv+width-3;
    Y12  = *yuv++;
    Y13  = *yuv++;
    Y14  = *yuv++;
    Y15  = *yuv;
    yuv = yuv-3*width+1;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y2 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y2 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y2 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y3 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y3 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y3 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba = 0;
    rgba = rgba + 4*width-15;

    R = Y4 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y4 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y4 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y5 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y5 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y5 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y6 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y6 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y6 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y7 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y7 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y7 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba = 0;
    rgba = rgba + 4*width-15;

    R = Y8 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y8 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y8 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y9 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y9 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y9 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y10 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y10 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y10 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y11 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y11 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y11 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba = 0;
    rgba = rgba + 4*width-15;

    R = Y12 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y12 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y12 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y13 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y13 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y13 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y14 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y14 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y14 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba++ = 0;

    //---
    R = Y15 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y15 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y15 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgba++ = (unsigned char)R;
    *rgba++ = (unsigned char)G;
    *rgba++ = (unsigned char)B;
    *rgba = 0;
    rgba = rgba -12*width+1;
    }
  yuv+=3*width;
  rgba+=12*width;
  }
}
void vpImageConvert::YVU9ToRGB(unsigned char* yuv, unsigned char* rgb,
                               unsigned int height, unsigned int width)
{
  //  std::cout << "call optimized ConvertYVU9ToRGB()" << std::endl;
  register int U, V, R, G, B, V2, U5, UV;
  register int Y0, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y10, Y11, Y12, Y13, Y14, Y15;
  unsigned int size = width*height;
  unsigned char* iV = yuv + size;
  unsigned char* iU = yuv + 17*size/16;
  for(unsigned int i = 0; i<height/4; i++)
  {
  for(unsigned int j = 0; j < width/4 ; j++)
    {
    U   = (int)((*iU++ - 128) * 0.354);
    U5  = 5*U;
    V   = (int)((*iV++ - 128) * 0.707);
    V2  = 2*V;
    UV  = - U - V;
    Y0  = *yuv++;
    Y1  = *yuv++;
    Y2  = *yuv++;
    Y3  = *yuv;
    yuv = yuv+width-3;
    Y4  = *yuv++;
    Y5  = *yuv++;
    Y6  = *yuv++;
    Y7  = *yuv;
    yuv = yuv+width-3;
    Y8  = *yuv++;
    Y9  = *yuv++;
    Y10  = *yuv++;
    Y11  = *yuv;
    yuv = yuv+width-3;
    Y12  = *yuv++;
    Y13  = *yuv++;
    Y14  = *yuv++;
    Y15  = *yuv;
    yuv = yuv-3*width+1;

    // Original equations
    // R = Y           + 1.402 V
    // G = Y - 0.344 U - 0.714 V
    // B = Y + 1.772 U
    R = Y0 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y0 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y0 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y1 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y1 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y1 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y2 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y2 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y2 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y3 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y3 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y3 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb = (unsigned char)B;
    rgb = rgb + 3*width-11;

    R = Y4 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y4 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y4 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y5 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y5 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y5 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y6 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y6 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y6 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y7 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y7 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y7 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb = (unsigned char)B;
    rgb = rgb + 3*width-11;

    R = Y8 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y8 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y8 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y9 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y9 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y9 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y10 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y10 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y10 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y11 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y11 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y11 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb = (unsigned char)B;
    rgb = rgb + 3*width-11;

    R = Y12 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y12 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y12 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y13 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y13 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y13 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y14 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y14 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y14 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;

    //---
    R = Y15 + V2;
    if ((R >> 8) > 0) R = 255; else if (R < 0) R = 0;

    G = Y15 + UV;
    if ((G >> 8) > 0) G = 255; else if (G < 0) G = 0;

    B = Y15 + U5;
    if ((B >> 8) > 0) B = 255; else if (B < 0) B = 0;

    *rgb++ = (unsigned char)R;
    *rgb++ = (unsigned char)G;
    *rgb++ = (unsigned char)B;
    rgb = rgb -9*width+1;
    }
  yuv+=3*width;
  rgb+=9*width;
  }
}

void vpImageConvert::RGBToRGBa(unsigned char* rgb, unsigned char* rgba, unsigned int size)
{
  unsigned char *pt_input = rgb;
  unsigned char *pt_end = rgb + 3*size;
  unsigned char *pt_output = rgba;

  while(pt_input != pt_end) {
    *(pt_output++) = *(pt_input++) ; // R
    *(pt_output++) = *(pt_input++) ; // G
    *(pt_output++) = *(pt_input++) ; // B
    *(pt_output++) = 0 ; // A
  }
}

void vpImageConvert::RGBaToRGB(unsigned char* rgba, unsigned char* rgb, unsigned int size)
{
  unsigned char *pt_input = rgba;
  unsigned char *pt_end = rgba + 4*size;
  unsigned char *pt_output = rgb;

  while(pt_input != pt_end) {
    *(pt_output++) = *(pt_input++) ; // R
    *(pt_output++) = *(pt_input++) ; // G
    *(pt_output++) = *(pt_input++) ; // B
    pt_input++ ;
  }
}
void vpImageConvert::RGBToGrey(unsigned char* rgb, unsigned char* grey, unsigned int size)
{
  unsigned char *pt_input = rgb;
  unsigned char* pt_end = rgb + size*3;
  unsigned char *pt_output = grey;
  while(pt_input != pt_end) {
    *pt_output = (unsigned char) (0.2126 * (*pt_input)
      + 0.7152 * (*(pt_input + 1))
      + 0.0722 * (*(pt_input + 2)) );
    pt_input += 3;
    pt_output ++;
  }
}
void vpImageConvert::RGBaToGrey(unsigned char* rgba, unsigned char* grey, unsigned int size)
{
  unsigned char *pt_input = rgba;
  unsigned char* pt_end = rgba + size*4;
  unsigned char *pt_output = grey;

  while(pt_input != pt_end) {
    *pt_output = (unsigned char) (0.2126 * (*pt_input)
      + 0.7152 * (*(pt_input + 1))
      + 0.0722 * (*(pt_input + 2)) );
    pt_input += 4;
    pt_output ++;
  }
}

void
vpImageConvert::GreyToRGBa(unsigned char* grey, unsigned char* rgba, unsigned int size)
{
  unsigned char *pt_input = grey;
  unsigned char *pt_end = grey + size;
  unsigned char *pt_output = rgba;

  while(pt_input != pt_end) {
    unsigned char p =  *pt_input ;
    *(pt_output     ) = p ; // R
    *(pt_output  + 1) = p ; // G
    *(pt_output  + 2) = p ; // B
    *(pt_output  + 3) = p ; // A

    pt_input ++;
    pt_output += 4;
  }
}

void
vpImageConvert::GreyToRGB(unsigned char* grey, unsigned char* rgb, unsigned int size)
{
  unsigned char *pt_input = grey;
  unsigned char* pt_end = grey + size;
  unsigned char *pt_output = rgb;

  while(pt_input != pt_end) {
    unsigned char p =  *pt_input ;
    *(pt_output     ) = p ; // R
    *(pt_output  + 1) = p ; // G
    *(pt_output  + 2) = p ; // B

    pt_input ++;
    pt_output += 3;
  }
}


void
vpImageConvert::BGRToRGBa(unsigned char * bgr, unsigned char * rgba,
                          unsigned int width, unsigned int height, bool flip)
{
  //if we have to flip the image, we start from the end last scanline so the
  //step is negative
  int lineStep = (flip) ? -(int)(width*3) : (int)(width*3);

  //starting source address = last line if we need to flip the image
  unsigned char * src = (flip) ? (bgr+(width*height*3)+lineStep) : bgr;
  unsigned char * line;

  unsigned int j=0;
  unsigned int i=0;

  for(i=0 ; i < height ; i++)
  {
    line = src;
    for( j=0 ; j < width ; j++)
    {
      *rgba++ = *(line+2);
      *rgba++ = *(line+1);
      *rgba++ = *(line+0);
      *rgba++ = 0;

      line+=3;
    }
    //go to the next line
    src+=lineStep;
  }

}

void
vpImageConvert::BGRToGrey(unsigned char * bgr, unsigned char * grey,
                          unsigned int width, unsigned int height, bool flip)
{
  //if we have to flip the image, we start from the end last scanline so the
  //step is negative
  int lineStep = (flip) ? -(int)(width*3) : (int)(width*3);

  //starting source address = last line if we need to flip the image
  unsigned char * src = (flip) ? bgr+(width*height*3)+lineStep : bgr;
  unsigned char * line;

  unsigned int j=0;
  unsigned int i=0;

  for(i=0 ; i < height ; i++)
  {
    line = src;
    for( j=0 ; j < width ; j++)
    {
      *grey++ = (unsigned char)( 0.2126 * *(line+2)
         + 0.7152 * *(line+1)
         + 0.0722 * *(line+0)) ;
      line+=3;
    }

    //go to the next line
    src+=lineStep;
  }
}
void
vpImageConvert::RGBToRGBa(unsigned char * rgb, unsigned char * rgba,
                          unsigned int width, unsigned int height, bool flip)
{
  //if we have to flip the image, we start from the end last scanline so the
  //step is negative
  int lineStep = (flip) ? -(int)(width*3) : (int)(width*3);

  //starting source address = last line if we need to flip the image
  unsigned char * src = (flip) ? (rgb+(width*height*3)+lineStep) : rgb;
  unsigned char * line;

  unsigned int j=0;
  unsigned int i=0;

  for(i=0 ; i < height ; i++)
  {
    line = src;
    for( j=0 ; j < width ; j++)
    {
      *rgba++ = *(line++);
      *rgba++ = *(line++);
      *rgba++ = *(line++);
      *rgba++ = 0;
    }
    //go to the next line
    src+=lineStep;
  }
}

void
vpImageConvert::RGBToGrey(unsigned char * rgb, unsigned char * grey,
                          unsigned int width, unsigned int height, bool flip)
{
  //if we have to flip the image, we start from the end last scanline so the
  //step is negative
  int lineStep = (flip) ? -(int)(width*3) : (int)(width*3);

  //starting source address = last line if we need to flip the image
  unsigned char * src = (flip) ? rgb+(width*height*3)+lineStep : rgb;
  unsigned char * line;

  unsigned int j=0;
  unsigned int i=0;

  unsigned r,g,b;

  for(i=0 ; i < height ; i++)
  {
    line = src;
    for( j=0 ; j < width ; j++)
    {
      r = *(line++);
      g = *(line++);
      b = *(line++);
      *grey++ = (unsigned char)( 0.2126 * r + 0.7152 * g + 0.0722 * b) ;
    }

    //go to the next line
    src+=lineStep;
  }
}

void vpImageConvert::computeYCbCrLUT()
{
  if (YCbCrLUTcomputed == false) {
    int index = 256, aux;

    while (index-- ) {

      aux = index - 128;
      vpImageConvert::vpCrr[index] = (int)( 364.6610 * aux) >> 8;
      vpImageConvert::vpCgb[index] = (int)( -89.8779 * aux) >> 8;
      vpImageConvert::vpCgr[index] = (int)(-185.8154 * aux) >> 8;
      vpImageConvert::vpCbb[index] = (int)( 460.5724 * aux) >> 8;
    }

    YCbCrLUTcomputed = true;
  }
}


void vpImageConvert::YCbCrToRGB(unsigned char *ycbcr, unsigned char *rgb, unsigned int size)
{
  unsigned char *cbv;
  unsigned char *crv;
  unsigned char *pt_ycbcr = ycbcr;
  unsigned char *pt_rgb = rgb;
  cbv = pt_ycbcr + 1;
  crv = pt_ycbcr + 3;

  vpImageConvert::computeYCbCrLUT();

  int col = 0;

    while (size--) {
        register int val_r, val_g, val_b;
        if (!(col++ % 2)) {
            cbv = pt_ycbcr + 1;
            crv = pt_ycbcr + 3;
        }

        val_r = *pt_ycbcr + vpImageConvert::vpCrr[*crv];
    val_g = *pt_ycbcr + vpImageConvert::vpCgb[*cbv] + vpImageConvert::vpCgr[*crv];
    val_b = *pt_ycbcr + vpImageConvert::vpCbb[*cbv];

    vpDEBUG_TRACE(5, "[%d] R: %d G: %d B: %d\n", size, val_r, val_g, val_b);

    *pt_rgb++ = (val_r < 0) ? 0u :
      ((val_r > 255) ? 255u : (unsigned char)val_r); // Red component.
    *pt_rgb++ = (val_g < 0) ? 0u :
      ((val_g > 255) ? 255u : (unsigned char)val_g); // Green component.
    *pt_rgb++ = (val_b < 0) ? 0u :
      ((val_b > 255) ? 255u : (unsigned char)val_b); // Blue component.

    pt_ycbcr += 2;
    }
}

void vpImageConvert::YCbCrToRGBa(unsigned char *ycbcr, unsigned char *rgba, unsigned int size)
{
  unsigned char *cbv;
  unsigned char *crv;
  unsigned char *pt_ycbcr = ycbcr;
  unsigned char *pt_rgba = rgba;
  cbv = pt_ycbcr + 1;
  crv = pt_ycbcr + 3;

  vpImageConvert::computeYCbCrLUT();

  int col = 0;

  while (size--) {
    register int val_r, val_g, val_b;
    if (!(col++ % 2)) {
      cbv = pt_ycbcr + 1;
      crv = pt_ycbcr + 3;
    }

    val_r = *pt_ycbcr + vpImageConvert::vpCrr[*crv];
    val_g = *pt_ycbcr + vpImageConvert::vpCgb[*cbv] + vpImageConvert::vpCgr[*crv];
    val_b = *pt_ycbcr + vpImageConvert::vpCbb[*cbv];

    vpDEBUG_TRACE(5, "[%d] R: %d G: %d B: %d\n", size, val_r, val_g, val_b);

    *pt_rgba++ = (val_r < 0) ? 0u :
      ((val_r > 255) ? 255u : (unsigned char)val_r); // Red component.
    *pt_rgba++ = (val_g < 0) ? 0u :
      ((val_g > 255) ? 255u : (unsigned char)val_g); // Green component.
    *pt_rgba++ = (val_b < 0) ? 0u :
      ((val_b > 255) ? 255u : (unsigned char)val_b); // Blue component.
    *pt_rgba++ = 0;

    pt_ycbcr += 2;
  }
}


void vpImageConvert::YCbCrToGrey(unsigned char* yuv, unsigned char* grey, unsigned int size)
{
 unsigned int i=0,j=0;

 while( j < size*2)
 {
   grey[i++] = yuv[j];
   grey[i++] = yuv[j+2];
   j+=4;
 }
}

void vpImageConvert::YCrCbToRGB(unsigned char *ycrcb, unsigned char *rgb, unsigned int size)
{
  unsigned char *cbv;
  unsigned char *crv;
  unsigned char *pt_ycbcr = ycrcb;
  unsigned char *pt_rgb = rgb;
  crv = pt_ycbcr + 1;
  cbv = pt_ycbcr + 3;

  vpImageConvert::computeYCbCrLUT();

  int col = 0;

  while (size--) {
    register int val_r, val_g, val_b;
    if (!(col++ % 2)) {
      crv = pt_ycbcr + 1;
      cbv = pt_ycbcr + 3;
    }

    val_r = *pt_ycbcr + vpImageConvert::vpCrr[*crv];
    val_g = *pt_ycbcr + vpImageConvert::vpCgb[*cbv] + vpImageConvert::vpCgr[*crv];
    val_b = *pt_ycbcr + vpImageConvert::vpCbb[*cbv];

    vpDEBUG_TRACE(5, "[%d] R: %d G: %d B: %d\n", size, val_r, val_g, val_b);

    *pt_rgb++ = (val_r < 0) ? 0u :
      ((val_r > 255) ? 255u : (unsigned char)val_r); // Red component.
    *pt_rgb++ = (val_g < 0) ? 0u :
      ((val_g > 255) ? 255u : (unsigned char)val_g); // Green component.
    *pt_rgb++ = (val_b < 0) ? 0u :
      ((val_b > 255) ? 255u : (unsigned char)val_b); // Blue component.

    pt_ycbcr += 2;
  }
}
void vpImageConvert::YCrCbToRGBa(unsigned char *ycrcb, unsigned char *rgba, unsigned int size)
{
  unsigned char *cbv;
  unsigned char *crv;
  unsigned char *pt_ycbcr = ycrcb;
  unsigned char *pt_rgba = rgba;
  crv = pt_ycbcr + 1;
  cbv = pt_ycbcr + 3;

  vpImageConvert::computeYCbCrLUT();

  int col = 0;

  while (size--) {
    register int val_r, val_g, val_b;
    if (!(col++ % 2)) {
      crv = pt_ycbcr + 1;
      cbv = pt_ycbcr + 3;
    }

    val_r = *pt_ycbcr + vpImageConvert::vpCrr[*crv];
    val_g = *pt_ycbcr + vpImageConvert::vpCgb[*cbv] + vpImageConvert::vpCgr[*crv];
    val_b = *pt_ycbcr + vpImageConvert::vpCbb[*cbv];

    vpDEBUG_TRACE(5, "[%d] R: %d G: %d B: %d\n", size, val_r, val_g, val_b);

    *pt_rgba++ = (val_r < 0) ? 0u :
      ((val_r > 255) ? 255u : (unsigned char)val_r); // Red component.
    *pt_rgba++ = (val_g < 0) ? 0u :
      ((val_g > 255) ? 255u : (unsigned char)val_g); // Green component.
    *pt_rgba++ = (val_b < 0) ? 0u :
      ((val_b > 255) ? 255u : (unsigned char)val_b); // Blue component.
    *pt_rgba++ = 0;

    pt_ycbcr += 2;
  }
}

void vpImageConvert::split(const vpImage<vpRGBa> &src,
                           vpImage<unsigned char>* pR,
                           vpImage<unsigned char>* pG,
                           vpImage<unsigned char>* pB,
                           vpImage<unsigned char>* pa)
{
  register size_t n = src.getNumberOfPixel();
  unsigned int height = src.getHeight();
  unsigned int width  = src.getWidth();
  unsigned char* input;
  unsigned char* dst ;

  vpImage<unsigned char>* tabChannel[4];

/*  incrsrc[0] = 0; //init
  incrsrc[1] = 0; //step after the first used channel
  incrsrc[2] = 0; //step after the second used channel
  incrsrc[3] = 0;
  incrsrc[4] = 0;
 */
  tabChannel[0] = pR;
  tabChannel[1] = pG;
  tabChannel[2] = pB;
  tabChannel[3] = pa;

  register size_t    i;    /* ordre    */
  for(unsigned int j = 0;j < 4;j++){
    if(tabChannel[j]!=NULL){
      if(tabChannel[j]->getHeight() != height ||
         tabChannel[j]->getWidth() != width){
        tabChannel[j]->resize(height,width);
      }
      dst = (unsigned char*)tabChannel[j]->bitmap;

      input = (unsigned char*)src.bitmap+j;
      i = 0;
#if 1 //optimization
      if (n >= 4) {    /* boucle deroulee lsize fois    */
        n -= 3;
        for (; i < n; i += 4) {
          *dst = *input; input += 4; dst++;
          *dst = *input; input += 4; dst++;
          *dst = *input; input += 4; dst++;
          *dst = *input; input += 4; dst++;
        }
        n += 3;
      }
#endif
      for (; i < n; i++) {
        *dst = *input; input += 4; dst ++;
      }
    }
  }
}

void vpImageConvert::MONO16ToGrey(unsigned char *grey16, unsigned char *grey, unsigned int size)
{
  register int i = (((int)size)<<1)-1;
  register int j = (int)size-1;
  register int y;

  while (i >= 0) {
    y = grey16[i--];
    grey[j--] = static_cast<unsigned char>( (y+(grey16[i--]<<8))>>8 );
  }
}

void vpImageConvert::MONO16ToRGBa(unsigned char *grey16, unsigned char *rgba, unsigned int size)
{
  register int i = (((int)size)<<1)-1;
  register int j = (int)(size*4-1);
  register int y;
  register unsigned char v;

  while (i >= 0) {
    y = grey16[i--];
    v = static_cast<unsigned char>( (y+(grey16[i--]<<8))>>8 );
    rgba[j--] = 0;
    rgba[j--] = v;
    rgba[j--] = v;
    rgba[j--] = v;
  }
}

/*
 * Local variables:
 * c-basic-offset: 2
 * End:
 */