#include <opencv2/core.hpp>

int count_NaNs_in_image(int rows, int cols) {
    cv::Mat1f test(rows, cols);
    test.setTo(std::numeric_limits<float>::quiet_NaN());
    cv::Mat1b is_nan = test != test;
    return cv::countNonZero(is_nan);
}

int main() {
  assert(16 == count_NaNs_in_image(4, 4)); // succeeds
  assert(44 == count_NaNs_in_image(4, 11)); // fails with 12 NaNs found instead of 44?

  return 0;
}

int count_not_not_nans_in_image(int rows, int cols) {
    cv::Mat1f test(rows, cols);
    test.setTo(std::numeric_limits<float>::quiet_NaN());
    cv::Mat1b is_not_nan = test == test;
    return cv::countNonZero(255 - is_not_nan);
}