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calculate area of an image occupied by edges - canny edge detection...

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Detect very faint circles, not clear edge. Hough Transform not working...

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why this contour detection code doesn't work properly?...

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How to find the exact edges/binary threshold of a metallic part like drill bit?...

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What is the method for edge detection of a binary image in python?...

OpenCV ret=False, is it reading the video, or not?...

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Using canny on colored image...

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