ocrad man page on DragonFly
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OCRAD(1) User Commands OCRAD(1)
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 cor‐
rectly. 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 © 2015 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.
ocrad 0.25 March 2015 OCRAD(1)
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