finding overlapping area between two random contours

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KalMandy 2017-3-24

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评论： KalMandy 2017-3-25

Hi all, I have x and y coordinates of closed contours with random shapes. I want to find the overlapping area in between any of the contours (If they overlap). Can you suggest a method to do this? Thank you.

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Answer 1

Image Analyst 2017-3-24

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You could make digital images with poly2mask() and then AND them and sum them or use bwarea():

overlapImage = bwarea(poly2mask(x1,y1,rows, columns) & poly2mask(x2,y2,rows, columns))

It's a digital approximation, not a 100% accurate analytical answer. The more pixels you use the more accurate it will be. What is the range of your numbers? Any negative values in there?

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KalMandy 2017-3-25

Hi, thanks for the reply. This is how a contour may look like. And there can be overlaps between many contours like this. I want to find the area/ or even the coordinates of points in the overlapping areas.

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