OpenCV/opencv_contrib/modules/line_descriptor/samples/compute_descriptors.cpp

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#include <iostream>
#include <opencv2/opencv_modules.hpp>

#ifdef HAVE_OPENCV_FEATURES2D

#include <opencv2/line_descriptor.hpp>
#include <opencv2/core/utility.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/features2d.hpp>
#include <opencv2/highgui.hpp>

using namespace cv;
using namespace cv::line_descriptor;


static const char* keys =
{ "{@image_path | | Image path }" };

static void help()
{
  std::cout << "\nThis example shows the functionalities of lines extraction " << "and descriptors computation furnished by BinaryDescriptor class\n"
            << "Please, run this sample using a command in the form\n" << "./example_line_descriptor_compute_descriptors <path_to_input_image>"
            << std::endl;
}

int main( int argc, char** argv )
{
  /* get parameters from command line */
  CommandLineParser parser( argc, argv, keys );
  String image_path = parser.get<String>( 0 );

  if( image_path.empty() )
  {
    help();
    return -1;
  }

  /* load image */
  cv::Mat imageMat = imread( image_path, 1 );
  if( imageMat.data == NULL )
  {
    std::cout << "Error, image could not be loaded. Please, check its path" << std::endl;
  }

  /* create a binary mask */
  cv::Mat mask = Mat::ones( imageMat.size(), CV_8UC1 );

  /* create a pointer to a BinaryDescriptor object with default parameters */
  Ptr<BinaryDescriptor> bd = BinaryDescriptor::createBinaryDescriptor();

  /* compute lines */
  std::vector<KeyLine> keylines;
  bd->detect( imageMat, keylines, mask );

  /* compute descriptors */
  cv::Mat descriptors;

  bd->compute( imageMat, keylines, descriptors);

}

#else

int main()
{
    std::cerr << "OpenCV was built without features2d module" << std::endl;
    return 0;
}

#endif // HAVE_OPENCV_FEATURES2D