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How to extract image region within boundary

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Ynne
Ynne on 7 Jan 2017
Commented: Image Analyst on 27 Jun 2018
Hi, I have to segment the LV from cardiac MRI. The output is an image with a boundary for the specified region (attached image). My question is how can i get only the region within the boundary. how to set the inside of the boundary to 1 and 0 for the rest for a binary image.
Thanks in advance.

Accepted Answer

Image Analyst
Image Analyst on 7 Jan 2017
It sounds like you have already identified the blue boundary somehow, because your question does not ask how to get the boundary in the first place. So, having the boundary, you should have an ordered list of x,y coordinates for it. So then, to create a mask that is 1 inside of the boundary and 0 outside the boundary, use poly2mask():
[rows, columns, numberOfColorChannels] = size(grayImage);
mask = poly2mask(x, y, rows, columns);
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Stalin Samuel
Stalin Samuel on 7 Jan 2017
If you complete the segmentation part probably you will have the information's of circular boundary Once you get the information you can do the remaining stuffs by referring here

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