How to unwrap the circle?

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Umme Tania 2013-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/89630-how-to-unwrap-the-circle

评论： Image Analyst 2014-1-24

采纳的回答： Alex Taylor

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Walter Roberson 2013-10-9

I am not sure what you mean by "unwrap" ? Are you wanting to project from the circle to a rectangle, interpolating to form a rectangular image like from stretching a sheet?

Umme Tania 2013-10-10

yes

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Alex Taylor 2013-10-10

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编辑：Alex Taylor 2013-10-11

在 MATLAB Online 中打开

Use a polar transformation with the center of the transformation set to the center of the circle (roughly [161, 172]).

I like Peter Kovesi's implementation of the polar transformation:

http://www.csse.uwa.edu.au/~pk/research/matlabfns/Misc/polartrans.m

a = imread('http://www.mathworks.com/matlabcentral/answers/uploaded_files/482/crop_image.jpg');
out = polartrans(a,500,500,161,172,'linear','valid');
imshow(out);