vpImageMorphology.h

/****************************************************************************
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2017 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://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * 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:
 * Morphology tools.
 *
 * Authors:
 * Fabien Spindler
 *
 *****************************************************************************/


#ifndef vpImageMorphology_H
#define vpImageMorphology_H

#include <visp3/core/vpImage.h>
#include <visp3/core/vpImageException.h>
#include <visp3/core/vpMatrix.h>

#include <fstream>
#include <iostream>
#include <math.h>
#include <string.h>

class VISP_EXPORT vpImageMorphology
{
public:
  typedef enum {
    CONNEXITY_4, 
    CONNEXITY_8 
  } vpConnexityType;

public:
  template<class Type>
  static void erosion(vpImage<Type> &I, Type value, Type value_out,
                      vpConnexityType connexity = CONNEXITY_4);

  template<class Type>
  static void dilatation(vpImage<Type> &I, Type value, Type value_out,
                         vpConnexityType connexity = CONNEXITY_4);

  static void erosion(vpImage<unsigned char> &I, const vpConnexityType &connexity = CONNEXITY_4);
  static void dilatation(vpImage<unsigned char> &I, const vpConnexityType &connexity = CONNEXITY_4);
} ;

template<class Type>
void vpImageMorphology::erosion(vpImage<Type> &I,
    Type value,
    Type value_out,
    vpConnexityType connexity)
{
  if(I.getSize() == 0) {
    std::cerr << "Input image is empty!" << std::endl;
    return;
  }

  vpImage<Type> J(I.getHeight()+2, I.getWidth()+2);
  // Copy I to J and add border
  for (unsigned int i = 0; i < J.getHeight(); i++) {
    if (i == 0 || i == J.getHeight() - 1) {
      for (unsigned int j = 0; j < J.getWidth(); j++) {
        J[i][j] = value;
      }
    } else {
      J[i][0] = value;
      memcpy(J[i]+1, I[i-1], sizeof(unsigned char)*I.getWidth());
      J[i][J.getWidth() - 1] = value;
    }
  }

  if (connexity == CONNEXITY_4) {
    for (unsigned int i = 0; i < I.getHeight(); i++) {
      for (unsigned int j = 0; j < I.getWidth(); j++) {
        if (J[i+1][j+1] == value) {
          // Consider 4 neighbors
          if ((J[i][j+1] == value_out) || //Top
              (J[i+2][j+1] == value_out) || //Bottom
              (J[i+1][j] == value_out) || //Left
              (J[i+1][j+2] == value_out)) { //Right
            I[i][j] = value_out;
          }
        }
      }
    }
  }
  else {
    for (unsigned int i = 0; i < I.getHeight(); i++) {
      for (unsigned int j = 0; j < I.getWidth(); j++) {
        if (J[i+1][j+1] == value) {
          // Consider 8 neighbors
          if ((J[i][j] == value_out) ||
              (J[i][j+1]   == value_out) ||
              (J[i][j+2] == value_out) ||
              (J[i+1][j]   == value_out) ||
              (J[i+1][j+2]   == value_out) ||
              (J[i+2][j] == value_out) ||
              (J[i+2][j+1] == value_out) ||
              (J[i+2][j+2] == value_out) )
            I[i][j] = value_out ;
        }
      }
    }
  }
}

template<class Type>
void vpImageMorphology::dilatation(vpImage<Type> &I,
    Type value,
    Type value_out,
    vpConnexityType connexity)
{
  if(I.getSize() == 0) {
    std::cerr << "Input image is empty!" << std::endl;
    return;
  }

  vpImage<Type> J(I.getHeight()+2, I.getWidth()+2);
  // Copy I to J and add border
  for (unsigned int i = 0; i < J.getHeight(); i++) {
    if (i == 0 || i == J.getHeight() - 1) {
      for (unsigned int j = 0; j < J.getWidth(); j++) {
        J[i][j] = value_out;
      }
    } else {
      J[i][0] = value_out;
      memcpy(J[i]+1, I[i-1], sizeof(unsigned char)*I.getWidth());
      J[i][J.getWidth() - 1] = value_out;
    }
  }

  if (connexity == CONNEXITY_4) {
    for (unsigned int i = 0; i < I.getHeight(); i++) {
      for (unsigned int j = 0; j < I.getWidth(); j++) {
        if (J[i+1][j+1] == value_out) {
          // Consider 4 neighbors
          if ((J[i][j+1] == value) || //Top
              (J[i+2][j+1] == value) || //Bottom
              (J[i+1][j] == value) || //Left
              (J[i+1][j+2] == value)) { //Right
            I[i][j] = value;
          }
        }
      }
    }
  }
  else {
    for (unsigned int i = 0; i < I.getHeight(); i++) {
      for (unsigned int j = 0; j < I.getWidth(); j++) {
        if (J[i+1][j+1] == value_out) {
          // Consider 8 neighbors
          if ((J[i][j] == value) ||
              (J[i][j+1]   == value) ||
              (J[i][j+2] == value) ||
              (J[i+1][j]   == value) ||
              (J[i+1][j+2]   == value) ||
              (J[i+2][j] == value) ||
              (J[i+2][j+1] == value) ||
              (J[i+2][j+2] == value) ) {
            I[i][j] = value ;
          }
        }
      }
    }
  }
}
#endif


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