Hi, i get a DVD, which has very bad quality. The picture is very blocky (seems, that the movie were compressed bad/strong). This is not the only problem. It seems, that the pictures at the end of a scene-change were compressed even stronger that the other pics in the scene, so that the most filter can produce a good pics in the scene, but produce bad pic (with black areas or bad artefacts) at the end of such a scene-end. I've tried many filters. The best filter for now is a simple "blur"-Filter. But then the pic lost the sharpenes. All other (different) Filters has this bad output-Pic at the end of a scene (at a scene-change). Can someone help wich filter i should use? Thanks ---------- EDIT: Below i have added some links to some sample-Pics of the Movie... wich seems to be kicked for now. I put them later online
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Hi, @scharfis_brain: thanks for your help. The block-Artifacts are away. Now i have the problem on the end of scenes (which i have discribed above). I looked now precisely at the picture and think, that this artefact is the result of the deinterlacing (the movie is interlaced). Are there filters, which determinate when is a scene-change, so that no both parts of the picture were used to deinterlace the picture, something like this: at normal frame: Kerneldeint (or something like this) at scene change: Duplicate field-Deinterlacer? And i saw i second problem. In the movie are some frames, which have a noise. The pixel (the noise-pixel) have mostly a different color as the objects were they are (mostly black or white) and are only one pixel big. This noise problem is only on some frames and the frams before and after does not have this noise. I have tried a smoother (smartSmother in VirtualDub), but when i put a high threthold the noise is away but also the sharpenes... Can someone give a tip. Thank you
I've searched around and now i know: The name of the noise is salt-n-pepper. The Name in PSP 7.0 (Englisch-Version) wich i described above is something with "remove salt and pepper" (not the music-group ;)) Well, i searched for a simple Filter, wich can remove such noise but could not find any. There is no specific filter, which can remove salt-n-pepper-noise. UnDot is one filter but can only remove noise of one pixel (correct me if i'm wrong). Other Filters make the picture smoother. I've tried now "SpotRemover" in VDub (Super-Filter, i think). It corrects many of such failures but i have after some time a Debug-View of the filter (Rectangles, which show the spot, which were removed) but the debug-modus is disabled. Well maybe someone can answer me this questions: Is there a Filter, wich removes Salt-N-Pepper-Noise (or is someone in build) and were Does someone know how i can remove the failure of SpotRemover. It seems that not all who use this filter have this problem. Thank you
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Hi. I tried to check the pictures you provided but your web page no longer exists :( Anyway, judging by the decriptions you give of the kind of noise, there a few filters that may help - Conditional Temporal Median Filter (newer version called DeSpot - read the whole thread): and also RemoveDirt: Both are excellent filters when tweaked appropriately.
wow... that's one awful DVD. scene change artefacts are usually caused by the mpeg-2 encoder not detecting scene changes and closing the GOP and inserting an I-frame. the last thing you want is a scenechange on a b-frame :O those can be mitigated a little with mpeg2dec3's postprocessing, but in the end you have to just accept that it's a bad source. Butthead (from Beavis and Butthead) said it best: "you can't polish a turd" removedirt wont help on scenechanges as it uses past and future frames to clean the current one (although I HIGHLY recommend it anyway... fast, light and does wonders for compressibility).
Wow, thanks for your tips. They are all very helpfull. DeSpot i found before yesterday and it do realy a good job. The pics are kicked by the provider and i have only 56k-Modem. But with your tips, i think i would not need to upload the pics. Big Thanks.
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I have upload all pics and modified the links above. All Links should work (hopefully longer, than the first time). @Bogalvator: RemoveDirt seems to be a good filter but i does not have a cpu which support SSE.... that's bad luck. But thanks.