How to calculate bit error rate of two images?

I have the Formula that i want to implement in Matlab..

Answer 1

[Bjorn Gustavsson]

xor is only really defined for a logical data-type, right? So what you want is to check the difference between each pixel in the two images? Then, if you have images in some comfortable data-type, like uint8, you want to figure out how many bits each difference corresponds to?

2 suggestions:

Have a look at:

absdI = abs(Im1-Im2);

and this should also be a useful hint:

[x1,x2,x3,x4] = ndgrid(0:1);
disp([(0:15)',x4(:),x3(:),x2(:),x1(:),sum([x4(:),x3(:),x2(:),x1(:)],2)])

HTH

[sami ullah]

i have uint8 i.e 0 to 255 values in the images. i think, xor between two images will give logical values.

[Bjorn Gustavsson]

Well you might think whatever you want. If you check the help for xor you will learn what it will return. You can also check what it actually does:

xor(uint8(7),uint8(15))

You can also have a look at the help for bitxor.