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In case of a Canny edge image findContours will find most of the contour points twice, because the line width is only 1 and findContours is looking for closed contours.
To remove duplicates you can map the contour points to an empty (zero) image. For every contour point add 1 at the image position and only copy the contour point to your new contour vector if the value at this position is zero. That would be the easiest way I think.
