opencv/modules/imgproc/test/test_distancetransform.cpp
Alexander Smorkalov fdab565711 Merge branch 4.x
2023-09-13 14:49:25 +03:00

132 lines
5.0 KiB
C++

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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));
}
TEST(Imgproc_DistanceTransform, wide_image_22732)
{
Mat src = Mat::zeros(1, 4099, CV_8U); // 4099 or larger used to be bad
Mat dist(src.rows, src.cols, CV_32F);
distanceTransform(src, dist, DIST_L2, DIST_MASK_PRECISE, CV_32F);
int nz = countNonZero(dist);
EXPECT_EQ(nz, 0);
}
TEST(Imgproc_DistanceTransform, large_square_22732)
{
Mat src = Mat::zeros(8000, 8005, CV_8U), dist;
distanceTransform(src, dist, DIST_L2, DIST_MASK_PRECISE, CV_32F);
int nz = countNonZero(dist);
EXPECT_EQ(dist.size(), src.size());
EXPECT_EQ(dist.type(), CV_32F);
EXPECT_EQ(nz, 0);
Point p0(src.cols-1, src.rows-1);
src.setTo(1);
src.at<uchar>(p0) = 0;
distanceTransform(src, dist, DIST_L2, DIST_MASK_PRECISE, CV_32F);
EXPECT_EQ(dist.size(), src.size());
EXPECT_EQ(dist.type(), CV_32F);
bool first = true;
int nerrs = 0;
for (int y = 0; y < dist.rows; y++)
for (int x = 0; x < dist.cols; x++) {
float d = dist.at<float>(y, x);
double dx = (double)(x - p0.x), dy = (double)(y - p0.y);
float d0 = (float)sqrt(dx*dx + dy*dy);
if (std::abs(d0 - d) > 1) {
if (first) {
printf("y=%d, x=%d. dist_ref=%.2f, dist=%.2f\n", y, x, d0, d);
first = false;
}
nerrs++;
}
}
EXPECT_EQ(0, nerrs) << "reference distance map is different from computed one at " << nerrs << " pixels\n";
}
BIGDATA_TEST(Imgproc_DistanceTransform, issue_23895_3x3)
{
Mat src = Mat::zeros(50000, 50000, CV_8U), dist;
distanceTransform(src.col(0), dist, DIST_L2, DIST_MASK_3);
int nz = countNonZero(dist);
EXPECT_EQ(nz, 0);
}
BIGDATA_TEST(Imgproc_DistanceTransform, issue_23895_5x5)
{
Mat src = Mat::zeros(50000, 50000, CV_8U), dist;
distanceTransform(src.col(0), dist, DIST_L2, DIST_MASK_5);
int nz = countNonZero(dist);
EXPECT_EQ(nz, 0);
}
BIGDATA_TEST(Imgproc_DistanceTransform, issue_23895_5x5_labels)
{
Mat src = Mat::zeros(50000, 50000, CV_8U), dist, labels;
distanceTransform(src.col(0), dist, labels, DIST_L2, DIST_MASK_5);
int nz = countNonZero(dist);
EXPECT_EQ(nz, 0);
}
}} // namespace