Thread Subject: eigen face

  
   hello
       i want to see eigen face of an images. i made a
program for find out the eigen vector and eigen vales of
an image.

      so plz help me.

What is look of the eigen face of your program? Eigen face is usually something like ghost image having numerous faces. It also depends on the number of images used in the database.

Yumnam Kirani Singh <kirani.singh@gmail.com> wrote in
message
<14621476.1201606116555.JavaMail.jakarta@nitrogen.mathforum
.org>...
> What is look of the eigen face of your program? Eigen
face is usually something like ghost image having numerous
faces. It also depends on the number of images used in the
database.


hi i want to see that ghostly images.plz tell me how can
i see that using matlab...plz guide me.
       thanks

"Richa Agarwal" <richa86agarwal@mathworks.com> wrote in
message <fnn62m$fuj$1@fred.mathworks.com>...
> Yumnam Kirani Singh <kirani.singh@gmail.com> wrote in
> message
> <14621476.1201606116555.JavaMail.jakarta@nitrogen.mathforum
> .org>...
> > What is look of the eigen face of your program? Eigen
> face is usually something like ghost image having numerous
> faces. It also depends on the number of images used in the
> database.
>
>
> hi i want to see that ghostly images.plz tell me how can
> i see that using matlab...plz guide me.
> thanks

Using PCA or ICA or NMF decomposition, you can receive
eigenface.

We have two toolboxes and you can try

http://www.bsp.brain.riken.jp/ICALAB/
http://www.bsp.brain.riken.jp/ICALAB/nmflab.html

  - Build matrix X whose each column is a face.
  - Set the mixing model is real data
  - Choose ICA algorithm or NMF algorithm
  - XH in NMFLAB or Y in ICALAB is eigenfaces.

There are some open-code algrithms in these toolboxes, open
these files, and you can find how to run and find eigenface.

HTH
Anh Huy Phan
RIKEN - BSI

You wrote that you have writen programs for eigen faces, still you want to see how eigen faces look like. If you are using ICA, the two links given by Huy might be helpful. If you are using PCA, you do some search in google, you may find some matlab codes. Note that you have to have some images, either your digital images or images of your friends. Also, note that images should of same size, otherwise it will generate errors while creatin the eigenface. What more shoul I say!

dear richa!

viewing the eigenface is very easy. first you need to
reshape the vector to the same size as your pics (say
112x92)
using reshape() you can accomplish that very easily.
suppose you want to view your first eigen vector:

eVec = reshape(X(:,1),112,92)

and then display it using:

imagesc(eVec);
 
herez a tutorial which really helped me
http://www.cs.ait.ac.th/~mdailey/matlab/