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Why doesn’t findContours() detect my circle even though it is clearly visible after thresholding?

Hi everyone, I’m learning OpenCV and working on detecting a circular fiducial. My current pipeline is: Image → threshold → findContours() → drawContours() After thresholding, I can clearly see the fiducial as a clean circular region in the binary image. However, when I use cv2.findContours() and th…

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  1. 2026-10-02 13:57 · r/computervision
    Why doesn’t findContours() detect my circle even though it is clearly visible after thresholding?

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