1OCRAD(1)                         User Commands                        OCRAD(1)
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3
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NAME

6       ocrad - command line text recognition tool
7

SYNOPSIS

9       ocrad [options] [files]
10

DESCRIPTION

12       GNU  Ocrad is an OCR (Optical Character Recognition) program based on a
13       feature extraction  method.  It  reads  images  in  pbm  (bitmap),  pgm
14       (greyscale) or ppm (color) formats and produces text in byte (8-bit) or
15       UTF-8 formats. The pbm, pgm and ppm formats are collectively  known  as
16       pnm.
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18       Ocrad includes a layout analyser able to separate the columns or blocks
19       of text normally found on printed pages.
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21       For best results the characters should be at least 20 pixels  high.  If
22       they are smaller, try the --scale option. Scanning the image at 300 dpi
23       usually produces a character size good enough for ocrad.  Merged,  very
24       bold or very light (broken) characters are normally not recognized cor‐
25       rectly. Try to avoid them.
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OPTIONS

28       -h, --help
29              display this help and exit
30
31       -V, --version
32              output version information and exit
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34       -a, --append
35              append text to output file
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37       -c, --charset=<name>
38              try '--charset=help' for a list of names
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40       -e, --filter=<name>
41              try '--filter=help' for a list of names
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43       -E, --user-filter=<file>
44              user-defined filter, see manual for format
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46       -f, --force
47              force overwrite of output file
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49       -F, --format=<fmt>
50              output format (byte, utf8)
51
52       -i, --invert
53              invert image levels (white on black)
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55       -l, --layout
56              perform layout analysis
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58       -o, --output=<file>
59              place the output into <file>
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61       -q, --quiet
62              suppress all messages
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64       -s, --scale=[-]<n>
65              scale input image by [1/]<n>
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67       -t, --transform=<name>
68              try '--transform=help' for a list of names
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70       -T, --threshold=<n%>
71              threshold for binarization (0-100%)
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73       -u, --cut=<l,t,w,h>
74              cut input image by given rectangle
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76       -v, --verbose
77              be verbose
78
79       -x, --export=<file>
80              export results in ORF format to <file>
81
82       If no files are specified, ocrad reads the image from  standard  input.
83       If the -o option is not specified, ocrad sends text to standard output.
84
85       Exit  status:  0  for a normal exit, 1 for environmental problems (file
86       not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt  or
87       invalid input file, 3 for an internal consistency error (eg, bug) which
88       caused ocrad to panic.
89

REPORTING BUGS

91       Report bugs to bug-ocrad@gnu.org
92       Ocrad home page: http://www.gnu.org/software/ocrad/ocrad.html
93       General help using GNU software: http://www.gnu.org/gethelp
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96       Copyright © 2017 Antonio Diaz Diaz.  License GPLv2+: GNU GPL version  2
97       or later <http://gnu.org/licenses/gpl.html>
98       This  is  free  software:  you  are free to change and redistribute it.
99       There is NO WARRANTY, to the extent permitted by law.
100

SEE ALSO

102       The full documentation for ocrad is maintained as a Texinfo manual.  If
103       the  info  and  ocrad programs are properly installed at your site, the
104       command
105
106              info ocrad
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108       should give you access to the complete manual.
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112ocrad 0.26                        March 2017                          OCRAD(1)
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