how can i implement given formula in image processing?

i have to aplly this foumula for contrast streching plz give me matlab program of this formula

s=(a-rmin)*(L/(rmax-rmin)); where L=256 rmin=0 rimax=255

Answer 1

[Nitin]

There are lots of options for this:

Please check out the Matlab functions here.

You might need to define smaller blocks in your image and apply it locally depending on your requirements

[ibtisam aslam]

thankx nitni... but i have to do contrast straching using given formula no with builtin command.

[Nitin]

try dividing your image into smaller regions and apply your algorithm on each region

[ibtisam aslam]

nitini i agree with you.. can u send me complete program...?

[Image Analyst]

I don't. I see no reason why scaling an image would require doing it region by region. Nothing has been said by the original poster that would require that. And since mat2gray does exactly the operation they requested, I'm not sure why they're not following my answer.

Answer 2

[Image Analyst]

Simply use mat2gray().

Or, if you want to scale to something other than min-to-0 and max-to-255 you can use imadjust.