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


   yuvmedianfilter  [-r  num] [-R num] [-t num] [-T num] [-I num] [-f] [-w
   num] [-s num] [-v num] [-h]


   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 accepts the following options:

   -r num
        Radius for luma median (default: 2 pixels)

   -R num
        Radius for chroma median (default: 2 pixels)

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

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

   -I num
        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.

   -w num
        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.

   -c num
        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.

   -s num
        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.

   -v num
        Verbosity level (0, 1 or 2)

   -h   Print out a help message


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


   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:

   For more info, see our website at


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


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