How can i make feature extraction using PCA using matlab code on galaxy image ?

Please help me ..

i want to make feature extraction using PCA ,using matlab code on galaxy image like that >>

I was wondering if anyone could help me with a few steps or even code to make feature extraction from images .

I would like to extract the features of galaxy images and then classify them in the classification learner app.

The data I have is a set of galaxy imagse.

The aim is to extract the features and then compare them in the classification app with each other.

Any help is appreciated!

i want to know how pca work ? does it work in gray images only ??

Thanks ..

[Aya Ahmed]

Image Analyst please help me in that question:

[Image Analyst]

What features do you want to measure?

[Aya Ahmed]

Image Analyst

I classify galaxies images into 3 types of galaxies.. spiral, irrigular , elliptical . and these are the steps that i make

1-i have done image preprocessing on the images.

2- I want to make a feature extraction to the images in order to insert it to the classifier and through it ,it can determine what kind of galaxies they are.

this is the phase2 that i want to make >>

i make the step A. Morphological Features of galaxy

and this is the result :-

step B. Principal Component Analysis (PCA) Features

i want to make it .

[Aya Ahmed]

[Aya Ahmed]

Image Analyst any help please?