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#include "test_precomp.hpp"
#include "opencv2/photo.hpp"
#include <string>

using namespace cv;
using namespace std;

static const double numerical_precision = 10.;

TEST(Photo_Decolor, regression)
{
        string folder = string(cvtest::TS::ptr()->get_data_path()) + "decolor/";
        string original_path = folder + "color_image_1.png";

        Mat original = imread(original_path, IMREAD_COLOR);

        ASSERT_FALSE(original.empty()) << "Could not load input image " << original_path;
        ASSERT_FALSE(original.channels()!=3) << "Load color input image " << original_path;

        Mat grayscale, color_boost;
        decolor(original, grayscale, color_boost);

        Mat reference_grayscale = imread(folder + "grayscale_reference.png", 0 /* == grayscale image*/);
        double error_grayscale = cvtest::norm(reference_grayscale, grayscale, NORM_L1);
        EXPECT_LE(error_grayscale, numerical_precision);

        Mat reference_boost = imread(folder + "boost_reference.png");
        double error_boost = cvtest::norm(reference_boost, color_boost, NORM_L1);
        EXPECT_LE(error_boost, numerical_precision);
}
