ocrad (1)

ocrad [\,options\/] [\,files\/]

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.

-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

-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.

Report bugs to [email protected]

Ocrad home page: http://www.gnu.org/software/ocrad/ocrad.html

General help using GNU software: http://www.gnu.org/gethelp

Copyright © 2014 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.

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.