support similarity masks #18624
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support similarity masks #18624
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Thank you for contribution! Please add simple test for new feature (reuse existed test code and testdata with adding artificial "rectangle" on input like on example). |
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Added the test, I hope it's good enough |
alalek
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Oct 20, 2020
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I ended up reworking |
alalek
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Oct 22, 2020
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Mar 30, 2023
* support similarity masks * add test for similarity threshold * short license in test * use UMat in buildSimilarityMask * fix win32 warnings * fix test indentation * fix umat/mat sync * no in-place argument for erode/dilate
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Content
This PR adds the necessary code to add a similarity mask to the exposure compensator of the stitching pipeline.
You can configure a
similarity_thresholdwhich defines a threshold on the relative error between the pixels of two images. If the error is above the threshold, it is ignored when calculating the exposure compensation. This allows the removal of ghosting artifacts due to exposure compensation when part of the images are different (for instance a moving car which would only be present on a single picture)Note that by default the behavior is unchanged.
Example
The top 2 images are the source images. The bottom left one used a block, per channel exposure compensation. The bottom right used the same, with a similarity threshold of 0.1.
Despite the seam finder and blender doing their job perfectly, the red artifact persists due to the exposure compensator.
The red rectangle has obviously been added artificially but that kind of artifact can exist naturally (example of a moving car above).
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.
-> The feature is not documented, but neither are the other features are the exposure compensators. They belong to the
detailnamespace, I guess this is why ?