tutorial-bridge-opencv-image.cpp

#include <iostream>
 
#include <visp3/core/vpImageConvert.h>
#include <visp3/io/vpImageIo.h>
 
#if defined(VISP_HAVE_OPENCV) && defined(HAVE_OPENCV_IMGPROC) && defined(HAVE_OPENCV_IMGCODECS)
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/imgcodecs/imgcodecs.hpp>
 
int main()
{
  // From ViSP to OpenCV conversion
  {
    vpImage<vpRGBa> Irgba;
    vpImageIo::read(Irgba, "monkey.jpeg");
 
    vpImage<unsigned char> Igrey;
    vpImageIo::read(Igrey, "monkey.jpeg");
 
    cv::Mat cv_img_color;
    vpImageConvert::convert(Irgba, cv_img_color);
 
    cv::Mat cv_img_grey;
    vpImageConvert::convert(Igrey, cv_img_grey);
 
    std::cout << "Save converted images from vpImage to cv::Mat" << std::endl;
    std::cout << "- monkey-cv-color.jpeg" << std::endl;
    std::cout << "- monkey-cv-grey.jpeg" << std::endl;
    cv::imwrite("monkey-cv-color.jpeg", cv_img_color);
    cv::imwrite("monkey-cv-grey.jpeg", cv_img_grey);
  }
 
  // From OpenCV to ViSP conversion
  {
#if VISP_HAVE_OPENCV_VERSION >= 0x030000
    cv::Mat cv_img_color = cv::imread("monkey.jpeg", cv::IMREAD_COLOR);
#else
    cv::Mat cv_img_color = cv::imread("monkey.jpeg", CV_LOAD_IMAGE_COLOR);
#endif
 
    vpImage<vpRGBa> Irgba;
    vpImageConvert::convert(cv_img_color, Irgba);
 
#if VISP_HAVE_OPENCV_VERSION >= 0x030000
    cv::Mat cv_img_grey = cv::imread("monkey.jpeg", cv::IMREAD_GRAYSCALE);
#else
    cv::Mat cv_img_grey = cv::imread("monkey.jpeg", CV_LOAD_IMAGE_GRAYSCALE);
#endif
 
    vpImage<unsigned char> Igrey;
    vpImageConvert::convert(cv_img_grey, Igrey);
 
    std::cout << "Save converted images from cv::Mat to vpImage" << std::endl;
    std::cout << "- monkey-vp-color.jpeg" << std::endl;
    std::cout << "- monkey-vp-grey.jpeg" << std::endl;
    vpImageIo::write(Irgba, "monkey-vp-color.jpeg");
    vpImageIo::write(Igrey, "monkey-vp-grey.jpeg");
  }
}
#else
int main()
{
  std::cout << "This tutorial required OpenCV imgproc and imgcodecs modules." << std::endl;
  return EXIT_SUCCESS;
}
#endif