Re: About BIJ PCA usage

Posted by Gabriel Landini on Mar 15, 2009; 10:32am
URL: http://imagej.273.s1.nabble.com/About-BIJ-PCA-usage-tp3693307p3693308.html

On Saturday 14 March 2009, Xin ZHOU wrote:
> I would like to use the PCA transformation to reduce the dimension of
> the features.
> However, even it exist PCA components in BIJ plugins, no documents are
> gieven.
> Can some one give an example of how to use it?

You submit a stack of images. Each slice represents a different variable. So
for pixel (x,y) across the stack, the z value are the variables associated to
it.
The result should be another stack in which each slice is a component. You
also get a Eigenvalue spectrum plot which shows the amount of the total
variance explained by each component.

I hope it helps

G.