how to separate an image into several areas according to some reference points in it?

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neda 2013-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/77895-how-to-separate-an-image-into-several-areas-according-to-some-reference-points-in-it

关闭： MATLAB Answer Bot 2021-8-20

Dear all I have a face image with some certain points in it(the irises and middle point of the mouth). I want to separate it into several areas for example 20 of 13*13 patches according to these three points as reference points.something like determining 20 ROIs in a face image.

If anyone can give me a hand about this?