How to get the boundary points?

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Chathu
Chathu 2016-5-2
评论： Chathu 2016-5-4
I have a mask(mask is for an image) which is saved in .mat format. Now, i want to take the boundary of this mask. Is it possible to convert from mask to boundary? Can anyone kindly guide me?

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Image Analyst
Image Analyst 2016-5-2
Yes. Use bwboundaries() to get a list of (x,y) coorindates. Use bwperim() if you want an image of the outer boundary.
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Image Analyst
Image Analyst 2016-5-4
Well you just have to figure out what the variable names were when they were saved, and then get back those same names, and make sure you're using the right one in the right place. It's just bookkeeping really. I mean, if the name is maskedRgbImage, it's probably an RGB image and don't use it where a gray scale image or binary (logical) image is expected.
Chathu
Chathu 2016-5-4
Thank you so much Image Analyst. Really appreciate your response.

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