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Correct IPP distanceTransform results with single thread#27432

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asmorkalov merged 7 commits intoopencv:4.xfromdkurt:d.kurtaev/ipp_distTransform
Jun 11, 2025

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Pull Request Readiness Checklist

resolves#24082

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

  • I agree to contribute to the project under Apache 2 License.
  • 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
  • The PR is proposed to the proper branch
  • There is a reference to the original bug report and related work
  • There is accuracy test, performance test and test data in opencv_extra repository, if applicable
    Patch to opencv_extra has the same branch name.
  • The feature is well documented and sample code can be built with the project CMake

asmorkalov and a-mos reacted with hooray emoji
@dkurtdkurt added category: imgproc pr: needs testNew functionality requires minimal tests set labelsJun 10, 2025
@dkurtdkurt added the bug labelJun 11, 2025
@dkurtdkurt marked this pull request as ready for reviewJune 11, 2025 05:38
@dkurtdkurt removed the pr: needs testNew functionality requires minimal tests set labelJun 11, 2025
@dkurtdkurt changed the titleStable IPP distanceTransform with single threadCorrect IPP distanceTransform results with single threadJun 11, 2025
@asmorkalovasmorkalov self-assigned thisJun 11, 2025
@asmorkalovasmorkalov added this to the4.12.0 milestoneJun 11, 2025
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cc@eplankin

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The new test fails on MacOS Intel:

[ RUN      ] Imgproc_DistanceTransform.ipp_deterministic_corner/Users/opencv-cn/GHA-OCV-4/_work/opencv/opencv/opencv/modules/imgproc/test/test_distancetransform.cpp:429: FailureExpected equality of these values:  expected    Which is: 2937  dist.at<float>(0, i)    Which is: 2937diff: 4.882812e-04[  FAILED  ] Imgproc_DistanceTransform.ipp_deterministic_corner (0 ms)
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@asmorkalovasmorkalov merged commitd750d43 intoopencv:4.xJun 11, 2025
53 of 55 checks passed
@dkurtdkurt deleted the d.kurtaev/ipp_distTransform branchJuly 17, 2025 11:07
@asmorkalovasmorkalov mentioned this pull requestJul 21, 2025
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@asmorkalovasmorkalovasmorkalov approved these changes

@vpisarevvpisarevAwaiting requested review from vpisarev

@mshabuninmshabuninAwaiting requested review from mshabunin

@opencv-alalekopencv-alalekAwaiting requested review from opencv-alalek

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Successfully merging this pull request may close these issues.

Non-deterministic behavior in cv2.distanceTransform()

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