gpu::flip problem when src == dst

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opencv_gpu

JeremyG
16 ●2

Reporting an issue (bug?) with the gpu::flip function in OpenCV 2.4.4. When I call gpu::flip (a, a, 0), the image is flipped but pixels appear corrupted. However when I call gpu::flip (a, b, 0) it works fine. I have not tried 2.4.5 because I have a workaround which is just declare a second matrix to store the result. Reporting it here in case others are having problems with it in the future.

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answered Apr 30 '13

Vladislav Vinogradov

4775 ●4 ●24 ●62

updated Apr 30 '13

gpu::flip doesn't work in-place, you have to store result in other matrix.

Most of gpu functions doesn't work in-place. Only simple per-pixel operations (add, subtract, treshold, etc) can store result to the same matrix.

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Thanks, that make sense. Would be good to add an assertion anyway though to check if src==dst for functions that don't work in place, could save people a lot of trouble.