I'm looking for a program to compare pixel pictures.
I have thousends of files with pictures (jpeg, pnm, pcx and so on).
To find identical pictures I can cmp two files. They are identical,
if they compare bit by bit identically. Okay, that's very easy.
But in my view two pictures are even identical, if they show the same,
but with different resolutions (eg. 640x480 and 1024x768). The cmp
program will fail in that case, because they are not identical bit
Does anybody know of a program, which analyzes the content of image
files and gives an answer, whether the pictures are the same or very
similar? It has something to do with pattern recognition.
I appreciate any hints and/or links.