TEST(Features2D_ORB, MaskValue)
{
    Mat gray = imread(cvtest::findDataFile("features2d/tsukuba.png"), IMREAD_GRAYSCALE);
    ASSERT_FALSE(gray.empty());

    cv::Rect roi(gray.cols/4, gray.rows/4, gray.cols/2, gray.rows/2);

    Mat mask255 = Mat::zeros(gray.size(), CV_8UC1);
    mask255(roi).setTo(255);

    Mat mask1 = Mat::zeros(gray.size(), CV_8UC1);
    mask1(roi).setTo(1);

    Ptr<ORB> orb = cv::ORB::create();

    vector<KeyPoint> keypoints_mask255;
    Mat descriptors_mask255;
    orb->detectAndCompute(gray, mask255, keypoints_mask255, descriptors_mask255, false);
    std::cout << "keypoints_mask255.size(): " << keypoints_mask255.size() << std::endl;
    std::cout << "descriptors_mask255.size(): " << descriptors_mask255.size()  << std::endl;


    vector<KeyPoint> keypoints_mask1;
    Mat descriptors_mask1;
    orb->detectAndCompute(gray, mask1, keypoints_mask1, descriptors_mask1, false);
    std::cout << "keypoints_mask1.size(): " << keypoints_mask1.size() << std::endl;
    std::cout << "descriptors_mask1.size(): " << descriptors_mask1.size()  << std::endl;

    Mat diff = descriptors_mask1 != descriptors_mask255;
    ASSERT_EQ(countNonZero(diff), 0) << "descriptors are not identical";
}

[ RUN      ] Features2D_ORB.MaskValue
keypoints_mask255.size(): 496
descriptors_mask255.size(): [32 x 496]
keypoints_mask1.size(): 109
descriptors_mask1.size(): [32 x 109]
unknown file: Failure
C++ exception with description "OpenCV(4.10.0-dev) /home/alexander/Projects/OpenCV/opencv-master/modules/core/src/arithm.cpp:1345: error: (-209:Sizes of input arguments do not match) The operation is neither 'array op array' (where arrays have the same size and the same type), nor 'array op scalar', nor 'scalar op array' in function 'compare'
" thrown in the test body.
[  FAILED  ] Features2D_ORB.MaskValue (15 ms)
[----------] 1 test from Features2D_ORB (15 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (15 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] Features2D_ORB.MaskValue