message: flann: std::vector<size_t> can't be converted into cv::Mat properly
  size_t is not supported cv::Mat type
diff: @@ -354,8 +354,8 @@ inline LshTable<unsigned char>::LshTable(unsigned int feature_size, unsigned int
  mask_ = std::vector<size_t>((feature_size * sizeof(char) + sizeof(size_t) - 1) / sizeof(size_t), 0);
  // A bit brutal but fast to code
  - std::vector<size_t> indices(feature_size * CHAR_BIT);
  - for (size_t i = 0; i < feature_size * CHAR_BIT; ++i) indices[i] = i;
  + std::vector<int> indices(feature_size * CHAR_BIT);
  + for (size_t i = 0; i < feature_size * CHAR_BIT; ++i) indices[i] = (int)i;
  #ifndef OPENCV_FLANN_USE_STD_RAND
  cv::randShuffle(indices);
  #else
  