yuvmedianfilter - A filter for yuv images produced by the mjpeg tools

       This man page was written by Bernhard Praschinger.
       The yuvmedianfilter program was written by Mike Bernson, and  adapted  to  the  yuv4mpeg2  stream  header
       format by Steven M. Schultz.

       If  you  have  questions,  remarks, problems or you just want to contact the developers, the main mailing
       list for the MJPEG-tools is:
         mjpeg-users@lists.sourceforge.net

       For more info, see our website at
              http://mjpeg.sourceforge.net

       It is slow.  Using a radius greater than the default of 2 is painfully slow.

yuvmedianfilter is designed to enhance/filter images.  It takes the input from STDIN and writes output to
       STDOUT.
       This  filter  looks  around  the  current  point  for a radius and averages the values that fall inside a
       threshold.  So the image is softened and the edges become more sharp. If the input material is noisy  (it
       is  always noisy but you do not always see it) the output images are improved and the encoder spends less
       bandwidth encoding noise.  The more sophisticated version of image filtering is yuvdenoise. But  you  can
       use  both  programs  in  the  encoding procces.  It cannot process a recorded file and write the improved
       version to another file.

       yuvmedianfilter - A filter for yuv images produced by the mjpeg tools

yuvmedianfilter accepts the following options:

       -rnum
            Radius for luma median (default: 2 pixels)

       -Rnum
            Radius for chroma median (default: 2 pixels)

       -tnum
            Trigger threshold for luma (default: 2 [0=disable])

       -Tnum
            Trigger threshold for chroma (default: 2 [0=disable])

       -Inum
            Interlacing type (0=no, 1=yes, default: taken from yuv stream)

       -f   Fast mode, i.e. the threshold is ignored, and a simple mean of the surrounding values is calculated.

       -wnum
            In fast mode, the weight given to the current value versus the surrounding values.  Default is 8.
            Note that certain combinations of radii and weights have been optimized to be even faster --  radius
            1 and weight 2.667, radius 1 and weight 8, and radius 2 and weight 8.

       -cnum
            In  slow  mode,  more  than  this fraction of the pixels must be within the threshold; otherwise the
            pixel is simply the weighted mean of pixels within a radius of 1.  Default is 0.33333.

       -snum
            Number of beginning frames to skip.  The first num frames are written to stdout unfiltered.  This is
            useful for resuming an interrupted job without having to duplicate work.

       -vnum
            Verbosity level (0, 1 or 2)

       -h   Print out a help message

mjpegtools(1), jpeg2yuv(1), lav2yuv(1), mpeg2enc(1), ppmtoy4m(1), yuv2lav(1), yuvdenoise(1), yuvscaler(1)

y4mutils                                        24 February 2003                              yuvmedianfilter(1)

yuvmedianfilter [-rnum] [-Rnum] [-tnum] [-Tnum] [-Inum] [-f] [-wnum] [-snum] [-vnum] [-h]