Fix imgwarp at borders when transparent.#23922
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asmorkalov merged 3 commits intoopencv:4.xfrom Jul 12, 2023
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Hi! Thanks for a proposal, can you please provide a test case which is fixed by these changes? |
dkurt
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Jul 4, 2023
dkurt
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Jul 10, 2023
I believe this is a proper fix to opencv#23562 The PR opencv#23754 overwrites data while that should not be the case with transparent data. The original test is failing because points at the border do not get computed because they do not have 4 neighbors to be computed. Still ,we can approximate their computation with whatever neighbors that are available.
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@vrabaud, I agree with your proposal, thanks for the contribution! Let's summarize the behavior. Am I correct that for the border pixels from source image (last row and last col), |
dkurt
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Jul 10, 2023
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@dkurt: kindof. It simply did not consider them (considering them as 0 would have been very ugly because weights were not adapted). So it considered them as whatever but mostly set their weights to 0. |
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Fix imgwarp at borders when transparent. opencv#23922 I believe this is a proper fix to opencv#23562 The PR opencv#23754 overwrites data while that should not be the case with transparent data. The original test is failing because points at the border do not get computed because they do not have 4 neighbors to be computed. Still ,we can approximate their computation with whatever neighbors that are available. ### Pull Request Readiness Checklist 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
thewoz
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May 29, 2024
Fix imgwarp at borders when transparent. opencv#23922 I believe this is a proper fix to opencv#23562 The PR opencv#23754 overwrites data while that should not be the case with transparent data. The original test is failing because points at the border do not get computed because they do not have 4 neighbors to be computed. Still ,we can approximate their computation with whatever neighbors that are available. ### Pull Request Readiness Checklist 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
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I believe this is a proper fix to #23562
The PR #23754 overwrites data while that should not be the case with transparent data. The original test is failing because points at the border do not get computed because they do not have 4 neighbors to be computed. Still ,we can approximate their computation with whatever neighbors that are available.
Pull Request Readiness Checklist
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request
Patch to opencv_extra has the same branch name.