Provided by: gnuastro_0.8-1_amd64 bug


       Segment - segmentation based on signal structure


       astsegment [OPTION...] ASTRdata


       Segment is part of GNU Astronomy Utilities 0.8.  Segment will segment an initially labeled
       region based on structure with the signal. It will first find true clumps (local  maxima),
       estimate  which ones have strong connections, and then grow them to cover the full area of
       each detection.

       For more information, please run any of the following commands. In particular  the  second
       contains  a  very  comprehensive  explanation  of Segment's invocation: expected input(s),
       output(s), and a full description of all the options.

       All options and their values:
              $ astsegment -P

       Inputs/Outputs and options:
              $ info astsegment

       Full section in manual/book:
              $ info Segment

       Full Gnuastro manual/book:
              $ info gnuastro

       If you couldn't find your answer in the manual, you can get direct help  from  experienced
       Gnuastro users and developers. For more information, please run:

              $ info help-gnuastro

       Segment options:


              HDU/extension of convolved image in file.

              Convolved image file to avoid convolution.

       -d, --detection=STR
              Filename of detection image (to segment).

              HDU containing detection image.

       -h, --hdu=STR/INT
              Extension name or number of input data.

       -k, --kernel=STR
              Filename of kernel to convolve with input.

              HDU containing kernel image.

              Filename of Sky values image to subtract.

              HDU containing Sky value to subtract.

              Filename of Sky standard deviation.

              HDU containing Sky standard deviation.

              STD input is actually variance.

              Tessellation (tile grid):

              Tile IDs in an image, the size of input.

       -F, --remainderfrac=FLT
              Fraction of remainder to split last tile.

              No. of neighbors to use for interpolation.

              Only interpolate over the blank tiles.

       -L, --largetilesize=INT[,INT]
              Sim. to --tilesize, but for larger tiles.

       -M, --numchannels=INT[,..] No. of channels in dim.s (FITS order).

              Display 1 element/tile, not full input res.

              Work (not tile) over channel edges.

       -Z, --tilesize=INT[,INT]
              Regular tile size on dim.s (FITS order).


       -D, --dontdelete
              Don't delete output if it exists.

       -K, --keepinputdir
              Keep input directory for automatic output.

              Finish after finding true clumps.

       -o, --output=STR
              Output file name.

              Output only object and clump labels.

              `txt', `fits-ascii', `fits-binary'.


       -B, --minskyfrac=FLT
              Min. fraction of undetected area in tile.

              Store segmentation steps in a file.

              Save clump S/N values into a file.

       -c, --snquant=FLT
              S/N Quantile of true sky clumps.

              Save grown clumps instead of original.

       -G, --gthresh=FLT
              Multiple of STD to stop growing clumps.

              Built internal clumps from minima.

       -m, --snminarea=INT
              Minimum area of clumps for S/N estimation.

              Minimum number for S/N estimation.

       -O, --objbordersn=FLT
              Min. S/N for grown clumps as one object.

       -s, --clumpsnthresh=FLT
              S/N threshold of true clumps.

       -v, --keepmaxnearriver
              Keep clumps with peak touching a river.

       -y, --minriverlength=INT
              Minimum len of useful grown clump rivers.

              Operating modes:

       -?, --help
              give this help list

       --cite BibTeX citation for this program.

              Read configuration file STR immediately.

       -C, --continueaftercheck
              Continue processing after checks.

              Do not parse any more configuration files.

              Minimum bytes in array to not use ram RAM.

       -N, --numthreads=INT
              Number of CPU threads to use.

              Only run if the program version is STR.

       -P, --printparams
              Print parameter values to be used and abort.

       -q, --quiet
              Only report errors, remain quiet about steps.

       -S, --setdirconf
              Set default values for this directory and abort.

              give a short usage message

       -U, --setusrconf
              Set default values for this user and abort.

       -V, --version
              print program version

       Mandatory  or  optional  arguments  to long options are also mandatory or optional for any
       corresponding short options.

       GNU Astronomy Utilities home page:


       Report bugs to


       Copyright © 2015-2018, Free Software Foundation, Inc.  License GPLv3+: GNU General  public
       license version 3 or later.
       This  is free software: you are free to change and redistribute it.  There is NO WARRANTY,
       to the extent permitted by law.

       Written/developed by Mohammad Akhlaghi


       The full documentation for Segment is maintained as a Texinfo manual.   If  the  info  and
       Segment programs are properly installed at your site, the command

              info Segment

       should give you access to the complete manual.