Can PCA be applied directly on an image?

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sidra
sidra 2013-11-13
评论： sidra 2013-11-21
Can PCA be applied directly on an image, in contrast to a matrix(in which rows correspond to observations & columns to variables)?
When i try to apply PCA using SVD/Covariance directly on an image i get the following error:
"Error using minus
Integers can only be combined with integers of same class or scalar doubles.
Error in pca2 at 14
data=data-repmat(mn,1,N);"
Thanking you in advance

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采纳的回答

Walter Roberson
Walter Roberson 2013-11-14
Apply it to im2double() of the image.

更多回答（1 个）

sidra
sidra 2013-11-18
Walter, it works fine for a single image but when i try the same on array of images i get the error :
"Array dimensions must match for binary array op.
error in pca2 at 14
data=data-repmat(mn,1,N);
error in db.pca at 18
pc=pca2(imagearray);"

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