I think that motion has the same effect as "raising the spatial frequency" of the picture, which means that the proper Nyquist filter has effectively a lower bandwidth. The end result is that motion is inevitably more blurred than static pictures. I haven't seen any papers or books which provide a proper mathematical analysis of this effect, but I'm sure that they're out there somewhere. At 08:32 AM 12/11/2004, Tom Barry wrote: >Mark - > >How much do you have to filter so that an image can move smoothly across >or down a fixed pixel display 1/2 pixel at a time without aperture >effect artifacts. Is it just to the Nyquist limit, or more? > >- Tom ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.