tony wrote: > I do not have any issues with interlacing (maybe because my screen is > small) on digital signals. I cannot say much about the EPIA TV-out or VGA/DVI, but I do have some experience in de-interlacing technology, so I'm sure this must be an issue. As long as the video material is progressive (like movies usually), everything is fine. But if the material is real interlaced, de-interlacing must be done. Most simple way is weaving, but this gives noticeable comb-like artifacts on anything that moves. Really ugly. Second most simple is bobbing, interpolate missing lines. This degrades vertical resolution noticeably and gives pixel steps on diagonal lines and round corners. Some may know this from DVB still pictures: DVB switches from interlaced to simple bob-like skip-field in pause mode. Another simple is averaging: Blend half frames together. Used together with bobbing to bring back some resolution, but introduces shadow pictures that can be seen even in live video. Most common is adaptive weave/bob or adaptive weave/average: Use weaving for non-moving areas and bobbing/averaging for moving areas. Quality depends noticeable on the quality of the motion detection and will give either weave or bob/average artifacts sometimes. In any case, moving things like stock ticker on news channels will be bobbed/averaged, giving lower quality. High-end are motion interpolation technologies that actually track moving parts of the picture and interpolate missing lines by using motion-interpolated lines. While doing this, its even possible to smoothly increase the frame rate without introducing judder. These high-end systems are used in better 100Hz tube TVs and flat screen TVs, running on specialized signal processors. A computer implementation of this method is available in WinDVD6 , but requires a whopping 3GHz CPU power to run smoothly. (Trimension[1] licensed from Philips) Based on that, my conclusion is that de-interlacing is done best inside the TV, not in the PC, and that means output as PAL720x576noscale without de-interlacing, no matter what connector you use, though this will be challenging on VGA/DVI. Cheers, Udo [1] http://www.trimension.com/index.php?page=products.html
