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OCRAD(1) User Commands OCRAD(1) NAME ocrad - optical 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 png or pnm formats and produces text in byte (8-bit) or UTF-8 formats. The formats pbm (bitmap), pgm (greyscale), and ppm (color) 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 option --scale. 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 (0.0-1.0) -u, --cut=<l,t,w,h> cut the input image by the rectangle given -v, --verbose be verbose -x, --export=<file> export results in ORF format to <file> If no files are specified, or if a file is '-', ocrad reads the image from standard input. If the option -o is not specified, ocrad sends text to standard output. Exit status: 0 for a normal exit, 1 for environmental problems (file not found, invalid command-line options, I/O errors, etc), 2 to indi- cate a corrupt or invalid input file, 3 for an internal consistency er- ror (e.g., 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 (C) 2024 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. GNU ocrad 0.29 January 2024 OCRAD(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | REPORTING BUGS | COPYRIGHT | SEE ALSO
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