skal wrote: > Are you using edge thinning? I'd be interesting to know if > it improves the ME matching... Refdivx's code uses sobel filtering in an edge detector as part of a perceptual error metric. See http://www.hvsmetrics.com/adapt_quant.c (I cant say I fully understand the rationale of the code though, would be nice if it was accomponied by some text and references if applicable.) Marco