How can I use Principal Component Analysis (PCA) to reduce features?

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wisam kh
wisam kh 2018-9-28
评论： Image Analyst 2018-9-30
Hello
I extract image features using the Gabor filter.
The number of features is large for each image (5670 X 1) row and single column. How can I use Principal Component Analysis to reduce features?

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Image Analyst
Image Analyst 2018-9-28
Call PCA and then only keep the PC's that you want, like 5 or 10 of them. So, how does a Gabor filter give 5670 features? Are you saying each pixel is a feature?
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wisam kh
wisam kh 2018-9-30
Thanks for your cooperation
gabor filter work on 8 orientations, so it give me large number of features.
suppose I have 40 features,
and call pca to reduce them, I got this error
Image Analyst
Image Analyst 2018-9-30
imgaborfilt() gives you two images from every image you give it. Where are your 5670 or 40 different features coming from if they're not the individual pixels in either the magnitude or phase Gabor images?
You can't run pca on just one 1-d vector. It doesn't make sense. If you have 40 features, then you'd need those 40 measurements from at least 40 different images to get PCs.

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