log-polar mapping conversion

Question

amitesh kumar 2011-1-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/164-log-polar-mapping-conversion

I want to change 512*512 pixel gray image into log-polar format. What is the exact procedure to convert it. I tried this with the following command..

function imP = ImToPolar (imR, rMin, rMax, M, N)

but here its showing error as

 imP = ImToPolar(im, 0.6, 1, 40, 200);
 ??? Undefined function or method 'ImToPolar' for input arguments of type 'double'.

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Walter Roberson 2011-1-20

This is an ongoing discussion in the newsgroup that is not capable of effective resolution in this forum. The poster does have a ImToPolar.m file that is not class-based, but there are currently doubts that the poster has the file on the matlab path.

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Answer 1

David Young 2011-1-20

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https://ww2.mathworks.cn/matlabcentral/answers/164-log-polar-mapping-conversion#answer_203

The poster is using ImToPolar from the file exchange, which does a polar transform. However, the text says that a log-polar transform is required, which is a different matter.

A log-polar transform is available as part of this file exchange submission:

http://www.mathworks.com/matlabcentral/fileexchange/27023

[Edited: original gave link to 27093, which incorporates 27023.]

The files logsample.m and logtform.m carry out the required operation, provided the Image Processing Toolbox is available.