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I have a rectangular image. I want to crop the AOI which is circular. Please guide me how to do it. I have attached the image here. It is an all sky image.

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skyimager 2016-11-23

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回答： Image Analyst 2016-11-23

采纳的回答： Image Analyst

I have a rectangular image. I want to crop the AOI which is circular. I want to define a suitable radius and only tat part has to be retained.

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Image Analyst 2016-11-23

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Create a circular mask like in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

Then you can multiply it by the image or use it as an index to zero out pixels:

grayImage(circlePixels) = 0;

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