principle component analysis for 4D images
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Dear All, I am trying to apply PCA on 4D image, where the 4th D is time. and once I center the data (by subtracting from mean), I should get negative values, which is not acceptable in my case. First, how to get red of negative values. Second thing, I wish to get time back. Third, how to apply rotation to get the factors.
Any suggestions on these two things. Thank you so much.
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Image Analyst
2017 年 11 月 23 日
If you cast your images to uint8 or uint16 before subtracting, you won't get any negative values because they will be clipped off. (Not sure why you want to do this though).
Not sure what you mean by the "second and third things"
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