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Merge pull request #24214 from dkurt:distanceTransform_big_step

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Fix distanceTransform for inputs with large step and height #24214

### Pull Request Readiness Checklist

resolves https://github.com/opencv/opencv/issues/23895

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake
This commit is contained in:
Dmitry Kurtaev
2023-09-05 15:21:10 +03:00
committed by GitHub
parent 21fb10c6a3
commit c4c2e2e796
2 changed files with 51 additions and 20 deletions
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modules/imgproc/test/test_distancetransform.cpp
+24
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@@ -344,4 +344,28 @@ TEST(Imgproc_DistanceTransform, large_square_22732)
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