NAME

       ocrad - command line text recognition tool

SYNOPSIS

       ocrad [options] [files]

DESCRIPTION

       GNU  Ocrad  is  an  OCR  (Optical Character Recognition) program based on a feature extraction method. It
       reads images in pbm (bitmap), pgm (greyscale) or ppm (color) formats and produces text in byte (8-bit) or
       UTF-8 formats. The pbm, pgm and ppm formats are collectively known as pnm.

       Ocrad includes a layout analyser able to separate the columns or blocks of text normally found on printed
       pages.

       For best results the characters should be at least 20 pixels high. If they are smaller, try  the  --scale
       option.  Scanning  the image at 300 dpi usually produces a character size good enough for ocrad.  Merged,
       very bold or very light (broken) characters are normally not recognized correctly. Try to avoid them.

OPTIONS

       -h, --help
              display this help and exit

       -V, --version
              output version information and exit

       -a, --append
              append text to output file

       -c, --charset=<name>
              try '--charset=help' for a list of names

       -e, --filter=<name>
              try '--filter=help' for a list of names

       -E, --user-filter=<file>
              user-defined filter, see manual for format

       -f, --force
              force overwrite of output file

       -F, --format=<fmt>
              output format (byte, utf8)

       -i, --invert
              invert image levels (white on black)

       -l, --layout
              perform layout analysis

       -o, --output=<file>
              place the output into <file>

       -q, --quiet
              suppress all messages

       -s, --scale=[-]<n>
              scale input image by [1/]<n>

       -t, --transform=<name>
              try '--transform=help' for a list of names

       -T, --threshold=<n%>
              threshold for binarization (0-100%)

       -u, --cut=<l,t,w,h>
              cut input image by given rectangle

       -v, --verbose
              be verbose

       -x, --export=<file>
              export results in ORF format to <file>

       If no files are specified, ocrad reads the image from standard input.  If the -o option is not specified,
       ocrad sends text to standard output.

       Exit  status:  0  for  a  normal  exit,  1 for environmental problems (file not found, invalid flags, I/O
       errors, etc), 2 to indicate a corrupt or invalid input file, 3 for an  internal  consistency  error  (eg,
       bug) which caused ocrad to panic.

REPORTING BUGS

       Report bugs to bug-ocrad@gnu.org
       Ocrad home page: http://www.gnu.org/software/ocrad/ocrad.html
       General help using GNU software: http://www.gnu.org/gethelp

COPYRIGHT

       Copyright   ©   2019   Antonio   Diaz   Diaz.    License   GPLv2+:   GNU   GPL   version   2   or   later
       <http://gnu.org/licenses/gpl.html>
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to  the  extent
       permitted by law.

SEE ALSO

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

              info ocrad

       should give you access to the complete manual.