--- [EMAIL PROTECTED] wrote: > > > So if for example you had an image of a building against a blue sky, if > > you looked closely next to the edge of the building there would be > > ghosts of the building edge adjacent to the edge in the playback image
> > of the blue sky. Credit lettering and station ID bugs also exhibit the > > ghosting due to the sharp edge transitions they create. The ghosts > > will be faint, and from a normal TV viewing distance, you will likely > > not see them, but if you look right up next to the TV, you should see > > them. > > I'm seeing these sorts of artifacts in the DV right from the camera, > actually. Actually a little different - I'll see a ghost image of an > entire dark area shifted off quite a few pixels, Not at all sure what > to make of that. I'm not sure that's the same thing I was seeing from --reduce-hf. A good description of the ghosts is to think of how ripples in a smooth pond would look from a single pebble dropped into the center. Imagine the same effect next to sharp edges in the video and you will have a good idea of what it looks like. Actually, I've seen the identical ringing from still image jpeg done poorly, and since mpeg at it's core is really just a variant on still image jpeg, it's not surprising that the same artifacts can occur. > I'll have to try some clean DV footage in sunlight to see what the > effects are in that case. I guess I shouldn't need any of these > tricks for that. If your camera CCD is decent quality, you should have a markedly better source image than anything I have to use. All of mine were from broadcast (cable) captures of NTSC over DC10+'s. As I indicated in another message, I did not see the ringing effect in the source mjpegs when played over a DC10+, only in the mpeg stream played over an H+, and only when using the --reduce-hf flag. __________________________________________________ Do you Yahoo!? Yahoo! Web Hosting - establish your business online http://webhosting.yahoo.com ------------------------------------------------------- This SF.net email is sponsored by:Crypto Challenge is now open! Get cracking and register here for some mind boggling fun and the chance of winning an Apple iPod: http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
