Re: [R] PCA on image data

From: Jorge Ivan Velez <jorgeivanvelez_at_gmail.com>
Date: Thu, 03 Jul 2008 08:19:24 -0400

Dear Marcel,

See ?princomp.

HTH, Jorge

On Thu, Jul 3, 2008 at 5:15 AM, Bio7 <marcel.austenfeld_at_uni-bielefeld.de> wrote:

>
> Dear R users,
>
> i would like to apply a PCA on image data for data reduction.
> The image data is available as three matrices for the
> RGB values. At the moment i use
>
> x <- data.frame(R,G,B)#convert image data to data frame
> pca<-princomp(x,retx = TRUE)
>
> This is working so far.
> >From this results then i want to create a new matrix
> from the first (second..) principal component. Here i stuck.
> So my question is how can i create this matrix from the results of the PCA.
> (Maybe there is also a faster method available for PCA?)
>
> Any answers or advices are appreciated
>
> With kind regards
>
> M.Austenfeld
>
> --
> View this message in context:
> http://www.nabble.com/PCA-on-image-data-tp18255217p18255217.html
> Sent from the R help mailing list archive at Nabble.com.
>
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