Hi,

perhaps anyone knows if this is possible. comparing image quality is almost imposible to describe without subjective influences. When someone rates an image quality as good there is at least one person, that doesn't think so. human preferences are always different.

So, I would like to know if there is away to "rate" the image quality by an algorithm that compares the original image to the produced one in following issues

• colour change(difference pixel by pixel
• blur rate
• artifacts and macroblocking

the first one would be the easiest one because you could check just the diffeence in colours and can give 3 values in +- of each hex-value both last once I don't know if this is possible, but the blocking could be detected by edge-finding.

and the king's quest would be to do that for more then just one image, because video is done with several frames.

perhaps you expert programmers could tell me, if such an automated algo can be done to bring some objective measurement divice into rating image quality. this could perhaps calm down some h.264 is better than x264 and better than vp8 and blaaah people :)

Andreas

1st posted here http://www.hdtvtotal.com/index.php?name=PNphpBB2&file=viewtopic&p=9705