is there a version of Principle Component Analysis for images?

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Mohamed Moawed
Mohamed Moawed 2013-4-15
hello everybody, i want to ask about Principle Component Analysis, a tool used for data analysis
is there a version for PCA that is used for analysis the images?
and i want a source code and some examples for that
thanks for your help

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回答（3 个）

Sean de Wolski
Sean de Wolski 2013-4-15
doc pca
and
edit pca
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Sean de Wolski
Sean de Wolski 2013-4-15
Essentially. You need to horizontally concatenate all of your images first.
Mohamed Moawed
Mohamed Moawed 2013-4-15
i = imread ('pout.tif'); x = i( : ); y = princomp(x); x = im2double (x); y = princomp(x); imshow (y)
i get no output!!!
what is the wrong here

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Adam Filion
Adam Filion 2013-4-15
I don't know much PCA myself, but I know we have some built-in tools in Statistics and Wavelet toolboxes that may be of use:
http://www.mathworks.com/help/stats/princomp.html http://www.mathworks.com/help/wavelet/ug/multiscale-principal-components-analysis.html
There are also a number of entries on the File Exchange for PCA:
http://www.mathworks.com/matlabcentral/fileexchange/index?utf8=%E2%9C%93&term=principal+component+analysis
Image Analyst
Image Analyst 2013-4-15
The most famous application of PCA to images is eigenfaces: http://en.wikipedia.org/wiki/Eigenface You can essentially construct any face image by a weighted sum of eigenface (PCA) images.
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Image Analyst
Image Analyst 2013-4-16
Sure, you could do it. Would that be useful to you? Why do you want PCA component images anyway?
Mohamed Moawed
Mohamed Moawed 2013-4-16
i want it to Analyze some fMRI cross-sectional brain images to early diagnosis Alzahimar Disease

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