opencv/modules/imgproc/test/test_distancetransform.cpp

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#include "test_precomp.hpp"

namespace opencv_test { namespace {

BIGDATA_TEST(Imgproc_DistanceTransform, large_image_12218)
{
    const int lls_maxcnt = 79992000;   // labels's maximum count
    const int lls_mincnt = 1;          // labels's minimum count
    int i, j, nz;
    Mat src(8000, 20000, CV_8UC1), dst, labels;
    for( i = 0; i < src.rows; i++ )
        for( j = 0; j < src.cols; j++ )
            src.at<uchar>(i, j) = (j > (src.cols / 2)) ? 0 : 255;

    distanceTransform(src, dst, labels, cv::DIST_L2, cv::DIST_MASK_3, DIST_LABEL_PIXEL);

    double scale = (double)lls_mincnt / (double)lls_maxcnt;
    labels.convertTo(labels, CV_32SC1, scale);
    Size size = labels.size();
    nz = cv::countNonZero(labels);
    EXPECT_EQ(nz, (size.height*size.width / 2));
}

}} // namespace