Trace the boundary of an image starting from the reference.

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Shirah 2013-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/80034-trace-the-boundary-of-an-image-starting-from-the-reference

Hello,

I am working as per the paper http://research.ijcaonline.org/volume42/number7/pxc3877726.pdf

I have already obtained the reference point which is inside the circle as shown in the first picture labelled(d) below. From there, how do I trace along the boundary of the image as per the direction indicated by the arrow in picture(d) such that I obtain the graph as per picture (g) which is distance versus index of boundary pixels. Thank You.

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Image Analyst 2013-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/80034-trace-the-boundary-of-an-image-starting-from-the-reference#answer_89818

Did you try bwtraceboundary()?

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Image Analyst 2013-6-25

bwtraceboundary should not be in a loop. It gets all the boundary pixels in one shot. If I were you though, I'd use bwboundaries() since it does not require you to specify a starting location and starting direction. As long as you don't care about that (most people don't), it's easier.

Shirah 2013-6-26