Re: ImageJ PCA

Posted by aszia787 on Apr 13, 2007; 1:01pm
URL: http://imagej.273.s1.nabble.com/ImageJ-PCA-tp3699745p3699749.html

Hi Gabriel,

Thanks for your reply. By 14 i mean that instead of submitting the entire 56 images, i assumed that i had a feature set of 14 images(not giving a stack of 56 images as its too tedious a task :)). It returned me a stack of 14 eigenimages after the PCA. I just want to extract the principal components. Example, if 14 images were submitted, i wanted to know the eigen values of each of the 14 images, and would have selected the first 3 highest eigen values of the 14 images to have the pricipal component and ignore the rest of the features. Is it possible with the BIJ plugin.

Thanks alot.

Regards,

Ali

Gabriel Landini wrote

On Wednesday 11 April 2007 18:40:30 aszia787 wrote:
> Dear all,
>
> I have a question in regards to the ImageJ plugins for PCA. I am trying to
> extract the principal components of a feature set that comprises of 56
> features. I used the ImageJ plugin for calculating the PCA for a stack of
> images and in the end i get a graph with the eigen values for the
> respective images. Initially i used 14 stacks to calculate the PCA,

Maybe I do not understand.
If you have 56 variables, where does the 14 (image stack?) come from?
I would have expected that each slice represents a different variable when one
submits the stack to the PCA (here I am talking of the BIJ plugin called
PCA).

Cheers,

G.