How to get all the x,y coordinates of inner boundary of an image?

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Mathews Jabaraj Soloman
评论： Mathews Jabaraj Soloman 2020-6-17
I need to draw a polygon shape boundary over the image and access all the coordinate points inside the boundary-
Please help me to draw the arbitary shape boundry over an image and store all the coordinates of [x y] in a variable.
Thanks in advance.

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Image Analyst
Image Analyst 2020-6-14
See my attached freehand drawing/masking demo.
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Image Analyst
Image Analyst 2020-6-17
You can use poly2mask() and bwboundaries(). It will get the boundaries of any blobs, whether exterior or interior (holes of the donut).

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