How to extract features from an image

Sir/madam..

I am new to matlab and my point of interest is image processing...

How to extract color feature from an image..??

Please guide me through this...

Many thanks, Rohit

Answer 1

[Sean de Wolski]

Isolate the channel of the color you care about and threshold. E.g. for blue:

M = Irgb(:,:,3)>56; %map of pixels with some blue

Answer 2

[fatin abbas]

you can compute the color histogram as a color feature , moment color feature , you can compute the color feature as global feature ( it is mean from whole image )or as local feature (partition the image to many parts )and compute the color feature for each feature in this case you can use one or two part in you processing ...