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OpenCV template/pixel difference detection: why do false detections follow the same shape

I’m using OpenCV to compare a reference image of an empty tray with another image of the same empty tray. There are no ICs/objects in either image, but when I use pixel difference (absdiff), I still get noticeable differences. I’ve taken multiple images under the same setup, and the difference patt…

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  1. 2026-10-08 11:55 · r/computervision
    OpenCV template/pixel difference detection: why do false detections follow the same shape

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