Denoising TV-Signals digitally

Software

• pgmfilter to compare various methods of denoising noisy images. The best results you get with linregr_adapt or with linregr_medmean. These filters actually not implemented as a XawTV-Plugin. An analysis can be found in Analyse und Implementation echtzeitfähiger Rauschfilter für digitalisierte Videosignale
• IIR-denoising patch for xawtv-sources (check http://linux.bytesex.org/xawtv/ for latest versions). This filter works good with noisy cartoons or animations. The file above is a gzipped patch to xawtv-3.88:
  • works in all YUV-Modi, RGB24, RGB32 and Gray, packed RGB not supported yet (to use YUV, try to start motv this way "motv -xvport 56", on 24 Bit X11 try "motv -noxv")
  • The normalize-stuff is there, because the FIR tends to darken the image, not useful in adaptive mode
  • The YUV modus filters only the Y-channel (b/w-channel).
  • The adaptive mode does an edge detection. Best use for cartoons. Try a horizontal value about 80%, vertical about 50% and adaptive to 10-12.
  • For normal usage set horizontal and vertical value to 50%, adaptive off or to 2-6
  If you have suggestions, a patch or you find a bug, please do not hesitate to contact me (GPL, 2,6kB)