Re: Best measure to find difference between 2 images?

Nasser Abbasi wrote:
> hello;
> 
> I have 2 images (of same size), both gray levels.  Say A and B.  B is a 
> modified version of A, and I'd like to measure how far B is from A.
> 
> I currently use RMSE and also use relative error,absolute error and 
> histogram difference. But I 'like' RMSE the most so far.
> 
> Is there a better method to quantify, in one number, the difference
between 
> 2 images that I am overlooking ?

You might find this interesting:

http://vision.arc.nasa.gov/dctune/

I will also point out that most of the measures
you seem to be considering break down badly
under affine (etc) transformations.

   BugBear