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#include "precomp.hpp"

namespace cv
{
namespace saliency
{

/**
 * StaticSaliency
 */

bool StaticSaliency::computeBinaryMap( InputArray _saliencyMap, OutputArray _binaryMap )
{
  Mat saliencyMap = _saliencyMap.getMat();
  Mat labels = Mat::zeros( saliencyMap.rows * saliencyMap.cols, 1, 1 );
  Mat samples = Mat_<float>( saliencyMap.rows * saliencyMap.cols, 1 );
  Mat centers;
  TermCriteria terminationCriteria;
  terminationCriteria.epsilon = 0.2;
  terminationCriteria.maxCount = 1000;
  terminationCriteria.type = TermCriteria::COUNT + TermCriteria::EPS;

  int elemCounter = 0;
  for ( int i = 0; i < saliencyMap.rows; i++ )
  {
    for ( int j = 0; j < saliencyMap.cols; j++ )
    {
      samples.at<float>( elemCounter, 0 ) = saliencyMap.at<float>( i, j );
      elemCounter++;
    }
  }

  kmeans( samples, 5, labels, terminationCriteria, 5, KMEANS_RANDOM_CENTERS, centers );

  Mat outputMat = Mat_<float>( saliencyMap.size() );
  int intCounter = 0;
  for ( int x = 0; x < saliencyMap.rows; x++ )
  {
    for ( int y = 0; y < saliencyMap.cols; y++ )
    {
      outputMat.at<float>( x, y ) = centers.at<float>( labels.at<int>( intCounter, 0 ), 0 );
      intCounter++;
    }

  }

  //Convert
  outputMat = outputMat * 255;
  outputMat.convertTo( outputMat, CV_8U );

  // adaptative thresholding using Otsu's method, to make saliency map binary
  _binaryMap.createSameSize(outputMat, outputMat.type());
  Mat BinaryMap = _binaryMap.getMat();
  threshold( outputMat, BinaryMap, 0, 255, THRESH_BINARY | THRESH_OTSU );

  return true;

}

}/* namespace saliency */
}/* namespace cv */
