Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

yuvmedianfilter(1) [debian man page]

yuvmedianfilter(1)						MJPEG tools manual						yuvmedianfilter(1)

yuvmedianfilter - A filter for yuv images produced by the mjpeg tools SYNOPSIS
yuvmedianfilter [-r num] [-R num] [-t num] [-T num] [-I num] [-f] [-w num] [-s num] [-v num] [-h] DESCRIPTION
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. OPTIONS
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 inter- rupted job without having to duplicate work. -v num Verbosity level (0, 1 or 2) -h Print out a help message BUGS
It is slow. Using a radius greater than the default of 2 is painfully slow. AUTHOR
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 SEE ALSO
mjpegtools(1), jpeg2yuv(1), lav2yuv(1), mpeg2enc(1), ppmtoy4m(1), yuv2lav(1), yuvdenoise(1), yuvscaler(1) MJPEG Linux Square 24 February 2003 yuvmedianfilter(1)

Check Out this Related Man Page

lav2yuv(1)							MJPEG tools manual							lav2yuv(1)

lav2yuv - Convert a MJPEG file to raw yuv SYNOPSIS
lav2yuv [options] lavfile1 [lavfile2 ... lavfileN] DESCRIPTION
lav2yuv converts an MJPEG video sequence described by a sequence of MJPEG video files and/or edit lists pointing to such files into the simple uncompressed planar 4:2:0 Y'CbCr format, as used by mpeg2enc(1) MPEG encoder and image processing filters like yuvscaler(1) or yuv2dfilter(1) or yuvdenoise(1). Output is to stdout so that by piping the output of lav2yuv into a suitable pipeline it is possible to process and then encode or play back video recorded in any of the mjpegtools MJPEG container formats: AVI, quicktime or edit lists describing editted versions of video held in such files. Mixing different files with different video formats is currently not possible. The -S -T -D options are used for scene detection which is used by linux video studio. OPTIONS
lav2yuv accepts the following options: -m Force mono-chrome -c Conceal frames containing corrupt MJPEG data by repeating the preceeding good frame. -S list.el Output a scene list with scene detection -T num Set scene detection threshold to num (default: 4) -D num Width decimation to use for scene detection (default: 2) -o num Frame offset - skip num frames at the beginning. if num is negative all but the last num frames are skipped -f num Only num frames are written to stdout. 0 means that all frames are processed. -A width:height Set/override the sample aspect ratio (SAR) emitted in the output stream header. Currently, the SAR is only auto-detected for DV files, and guessed otherwise. -P width:height Set the intended/approximate display aspect ratio (DAR) for the stream. This value is only used to guess the SAR when it cannot be detected from the input stream. The default DAR is '4:3' (corresponding to a standard TV screen); another useful value is '16:9' (corresponding to widescreen TV). -C chroma Set output chroma (default: '420jpeg'). Currently, '420jpeg', '420mpeg2', '420paldv', '422' are available. -x Exchange fields. Useful if the field order was reversed during editing. AUTHOR
This man page was originally written by Bernhard Praschinger. 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 SEE ALSO
mjpegtools(1), mpeg2enc(1), yuvscaler(1), yuv2lav(1), yuvdenoise(1), yuvplay(1) MJPEG Linux Square 6 March 2002 lav2yuv(1)
Man Page

Featured Tech Videos