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Source code changes of the file "doc/ocrad.info" between
ocrad-0.24.tar.gz and ocrad-0.25.tar.gz

About: GNU Ocrad is an OCR (Optical Character Recognition) program.

ocrad.info  (ocrad-0.24):ocrad.info  (ocrad-0.25)
File: ocrad.info, Node: Top, Next: Character sets, Up: (dir) File: ocrad.info, Node: Top, Next: Introduction, Up: (dir)
GNU Ocrad Manual GNU Ocrad Manual
**************** ****************
This manual is for GNU Ocrad (version 0.24, 3 October 2014). This manual is for GNU Ocrad (version 0.25, 31 March 2015).
GNU Ocrad is an OCR (Optical Character Recognition) program and
library 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.
* Menu: * Menu:
* Introduction:: Purpose and features of GNU Ocrad
* Character sets:: Input charsets and output formats * Character sets:: Input charsets and output formats
* Invoking ocrad:: Command line interface * Invoking ocrad:: Command line interface
* Filters:: Postprocessing the produced text
* Library version:: Checking library version * Library version:: Checking library version
* Library functions:: Descriptions of the library functions * Library functions:: Descriptions of the library functions
* Library error codes:: Meaning of codes returned by functions * Library error codes:: Meaning of codes returned by functions
* Image format conversion:: How to convert other formats to pnm * Image format conversion:: How to convert other formats to pnm
* Algorithm:: How ocrad does its job * Algorithm:: How ocrad does its job
* OCR results file:: Description of the ORF file format * OCR results file:: Description of the ORF file format
* Problems:: Reporting bugs * Problems:: Reporting bugs
* Concept index:: Index of concepts * Concept index:: Index of concepts
Copyright (C) 2003-2014 Antonio Diaz Diaz. Copyright (C) 2003-2015 Antonio Diaz Diaz.
This manual is free documentation: you have unlimited permission to This manual is free documentation: you have unlimited permission to
copy, distribute and modify it. copy, distribute and modify it.
File: ocrad.info, Node: Character sets, Next: Invoking ocrad, Prev: Top, Up: File: ocrad.info, Node: Introduction, Next: Character sets, Prev: Top, Up: T
Top op
1 Introduction
**************
1 Character sets GNU Ocrad is an OCR (Optical Character Recognition) program and library
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.
File: ocrad.info, Node: Character sets, Next: Invoking ocrad, Prev: Introduct
ion, Up: Top
2 Character sets
**************** ****************
The character set internally used by ocrad is ISO 10646, also known as The character set internally used by ocrad is ISO 10646, also known as
UCS (Universal Character Set), which can represent over two thousand UCS (Universal Character Set), which can represent over two thousand
million characters (2^31). million characters (2^31).
As it is unpractical to try to recognize one among so many different As it is unpractical to try to recognize one among so many different
characters, you can tell ocrad what character sets to recognize. You do characters, you can tell ocrad what character sets to recognize. You do
this with the '--charset' option. this with the '--charset' option.
skipping to change at line 61 skipping to change at line 72
if a code of 0xFD represents a 'latin small letter i dotless' or a if a code of 0xFD represents a 'latin small letter i dotless' or a
'latin small letter y with acute'. You should use '--format=utf8' 'latin small letter y with acute'. You should use '--format=utf8'
instead. instead.
Of course, you may request UTF-8 output in any case. Of course, you may request UTF-8 output in any case.
NOTE: 10^9 is a thousand millions, a billion is a million millions NOTE: 10^9 is a thousand millions, a billion is a million millions
(million^2), a trillion is a million million millions (million^3), and (million^2), a trillion is a million million millions (million^3), and
so on. Please, don't "embrace and extend" the meaning of prefixes, so on. Please, don't "embrace and extend" the meaning of prefixes,
making communication among all people difficult. Thanks. making communication among all people difficult. Thanks.
File: ocrad.info, Node: Invoking ocrad, Next: Library version, Prev: Characte r sets, Up: Top File: ocrad.info, Node: Invoking ocrad, Next: Filters, Prev: Character sets, Up: Top
2 Invoking ocrad 3 Invoking ocrad
**************** ****************
The format for running ocrad is: The format for running ocrad is:
ocrad [OPTIONS] [FILES] ocrad [OPTIONS] [FILES]
Ocrad supports the following options: Ocrad supports the following options:
'-h' '-h'
'--help' '--help'
skipping to change at line 96 skipping to change at line 107
'--charset=NAME' '--charset=NAME'
Enable recognition of the characters belonging to the given Enable recognition of the characters belonging to the given
character set. You can repeat this option multiple times with character set. You can repeat this option multiple times with
different names for processing a page with characters from different names for processing a page with characters from
different character sets. different character sets.
If no charset is specified, 'iso-8859-15' (latin9) is assumed. If no charset is specified, 'iso-8859-15' (latin9) is assumed.
Try '--charset=help' for a list of valid charset names. Try '--charset=help' for a list of valid charset names.
'-e NAME' '-e NAME'
'--filter=NAME' '--filter=NAME'
Pass the output text through the given postprocessing filter. Pass the output text through the given built-in postprocessing
Several filters can be applied in sequence using more than one filter (*note Filters::). Several filters can be applied in
'--filter' option. The filters are applied in the order they sequence using as many '--filter' and '--user-filter' options as
appear on the command line. needed. The filters are applied in the order they appear on the
command line.
'--filter=letters' forces every character that resembles a letter
to be recognized as a letter. Other characters will be output
without change.
'--filter=letters_only', same as '--filter=letters', but other
characters will be discarded.
'--filter=numbers' forces every character that resembles a number
to be recognized as a number. Other characters will be output
without change.
'--filter=numbers_only', same as '--filter=numbers' but other
characters will be discarded.
'--filter=same_height' discards any character (or noise) whose
height differs in more than 13 percent from the median height of
the characters in the line.
'--filter=upper_num' forces every character that resembles a
uppercase letter or a number to be recognized as such. Other
characters will be output without change.
'--filter=upper_num_only', same as '--filter=upper_num', but other
characters will be discarded.
Try '--filter=help' for a list of valid filter names. Try '--filter=help' for a list of valid filter names.
'-E FILE'
'--user-filter=FILE'
Pass the output text through the postprocessing filter defined in
FILE. See the chapter 'Filters' (*note Filters::) for a
description of the format of FILE. Several filters can be applied
in sequence using as many '--filter' and '--user-filter' options
as needed. The filters are applied in the order they appear on the
command line.
'-f' '-f'
'--force' '--force'
Force overwrite of output files. Force overwrite of output files.
'-F NAME' '-F NAME'
'--format=NAME' '--format=NAME'
Select the output format. The valid names are 'byte' and 'utf8'. Select the output format. The valid names are 'byte' and 'utf8'.
If no output format is specified, 'byte' (8 bit) is assumed. If no output format is specified, 'byte' (8 bit) is assumed.
'-i' '-i'
skipping to change at line 157 skipping to change at line 159
'-s VALUE' '-s VALUE'
'--scale=VALUE' '--scale=VALUE'
Scale up the input image by VALUE before layout analysis and Scale up the input image by VALUE before layout analysis and
recognition. If VALUE is negative, the input image is scaled down recognition. If VALUE is negative, the input image is scaled down
by -VALUE. by -VALUE.
'-t NAME' '-t NAME'
'--transform=NAME' '--transform=NAME'
Perform given transformation (rotation or mirroring) on the input Perform given transformation (rotation or mirroring) on the input
image before scaling, layout analysis and recognition. image before scaling, layout analysis and recognition. Rotations
are made counter-clockwise.
Try '--transform=help' for a list of valid transformation names. Try '--transform=help' for a list of valid transformation names.
'-T VALUE' '-T VALUE'
'--threshold=VALUE' '--threshold=VALUE'
Set binarization threshold for pgm or ppm files or for '--scale' Set binarization threshold for pgm or ppm files or for '--scale'
option (only for scaled down images). VALUE should be a rational option (only for scaled down images). VALUE should be a rational
number between 0 and 1, and may be given as a percentage (50%), a number between 0 and 1, and may be given as a percentage (50%), a
fraction (1/2), or a decimal value (0.5). Image values greater than fraction (1/2), or a decimal value (0.5). Image values greater than
threshold are converted to white. The default value is 0.5. threshold are converted to white. The default value is 0.5.
skipping to change at line 197 skipping to change at line 200
'--export=FILE' '--export=FILE'
Write (export) OCR results file to FILE (*note OCR results file::). Write (export) OCR results file to FILE (*note OCR results file::).
'-x -' writes to stdout, overriding text output except if output '-x -' writes to stdout, overriding text output except if output
has been also redirected with the '-o' option. has been also redirected with the '-o' option.
Exit status: 0 for a normal exit, 1 for environmental problems (file 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 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 invalid input file, 3 for an internal consistency error (eg, bug) which
caused ocrad to panic. caused ocrad to panic.
File: ocrad.info, Node: Library version, Next: Library functions, Prev: Invok File: ocrad.info, Node: Filters, Next: Library version, Prev: Invoking ocrad,
ing ocrad, Up: Top Up: Top
4 Postprocessing the produced text
**********************************
Filters replace some characters in the text output with different
characters and remove some other characters from the output. For
example, when recognizing a text that is known to contain just numbers,
any character recognized as a 'Z' will probably be a '2'.
Filters don't enable the recognition of characters, just filter them
from the output. Use '--charset' to enable the recognition of a
character set different from the default ISO-8859-15.
Ocrad provides both built-in filters and user-defined filters.
4.1 User-defined filters
========================
The format of a user-defined filter file (*note --user-filter::) is very
simple. Each line contains either a character conversion or a word that
specifies the default behaviour for unlisted characters.
A character conversion is a comma-separated list of quoted characters
('c'), character sets ([0-9A-Z]), character codes (U0063), or character
ranges (U0000 - UFFFF), and an optional conversion (an equal sign (=)
followed by a quoted character or a character code). The characters in
the list are converted to the character in the conversion. If no
conversion is specified, the character is left unmodified (converted to
itself).
The default behaviour is to discard unlisted characters, i.e. those
characters not appearing in the file, either by themselves or included
in a set or range. If a line containing just the word 'leave' is found
in the file, unlisted characters are left unmodified. If the word is
'mark', unlisted characters are marked as unrecognized.
The destination character of a conversion is considered as listed by
default. Every character may be listed more than once, even as part of
different conversions. The last conversion affecting a given character
is the one that is performed.
Character sets and quoted characters may contain escape sequences.
The character '#' at begin of line or after whitespace starts a
comment that extends to the end of the line.
Ranges of characters may be specified in character sets by writing
the starting and ending characters with a '-' between them. Thus,
'[A-Z]' matches any ASCII uppercase letter. '-' may be specified by
placing it first or last. ']' may be specified by placing it first. If
the first character after the left bracket is '^', it indicates a
"complemented set", which matches any character except the ones between
the brackets.
Literals (quoted characters and character sets) are decoded as
ISO-8859-15. Character codes are decoded as UCS2. Thus, a 'latin
capital letter y with diaeresis' is specified in a set as '[\xBE]', but
its code is 'U0178'.
Spaces and control characters are unaffected by filters, except that
leadind, trailing, and duplicate spaces produced by the removal of other
characters will be themselves removed.
Here is an example user-defined filter file equivalent to the built-in
filter 'numbers':
leave # remove this line to get 'numbers_only'
'D', 'O', 'Q', 'o' = '0'
'I', 'L', 'l', '|' = '1'
'Z', 'z' = '2'
'3'
'A', 'q' = '4'
'S', 's' = '5'
'G', 'b', U00F3 = '6' # latin small letter o with acute
'J', 'T' = '7'
'&', 'B' = '8'
'g' = '9'
4.2 Built-in filters
====================
Ocrad provides the following built-in filters (*note --filter::):
'--filter=letters'
Forces every character that resembles a letter to be recognized as
a letter. Other characters will be output without change.
'--filter=letters_only'
Same as '--filter=letters', but other characters will be discarded.
'--filter=numbers'
Forces every character that resembles a number to be recognized as
a number. Other characters will be output without change.
'--filter=numbers_only'
Same as '--filter=numbers' but other characters will be discarded.
'--filter=same_height'
Discards any character (or noise) whose height differs in more
than 10 percent from the median height of the characters in the
line.
'--filter=text_block'
Discards any character (or noise) outside of a rectangular block
of text lines.
'--filter=upper_num'
Forces every character that resembles a uppercase letter or a
number to be recognized as such. Other characters will be output
without change.
'--filter=upper_num_mark'
Same as '--filter=upper_num', but other characters will be marked
as unrecognized.
'--filter=upper_num_only'
Same as '--filter=upper_num', but other characters will be
discarded.
3 Library version File: ocrad.info, Node: Library version, Next: Library functions, Prev: Filte
rs, Up: Top
5 Library version
***************** *****************
-- Function: const char * OCRAD_version ( void ) -- Function: const char * OCRAD_version ( void )
Returns the library version as a string. Returns the library version as a string.
-- Constant: const char * OCRAD_version_string -- Constant: const char * OCRAD_version_string
This constant is defined in the header file 'ocradlib.h'. This constant is defined in the header file 'ocradlib.h'.
The application should compare OCRAD_version and OCRAD_version_string The application should compare OCRAD_version and OCRAD_version_string
for consistency. If the first character differs, the library code for consistency. If the first character differs, the library code
actually used may be incompatible with the 'ocradlib.h' header file actually used may be incompatible with the 'ocradlib.h' header file
used by the application. used by the application.
if( OCRAD_version()[0] != OCRAD_version_string[0] ) if( OCRAD_version()[0] != OCRAD_version_string[0] )
error( "bad library version" ); error( "bad library version" );
File: ocrad.info, Node: Library functions, Next: Library error codes, Prev: L ibrary version, Up: Top File: ocrad.info, Node: Library functions, Next: Library error codes, Prev: L ibrary version, Up: Top
4 Library functions 6 Library functions
******************* *******************
These are the OCRAD library functions. In case of error, all of them These are the OCRAD library functions. In case of error, all of them
return -1 or a null pointer, except 'OCRAD_open' whose return value return -1 or a null pointer, except 'OCRAD_open' whose return value
must be verified by calling 'OCRAD_get_errno' before using it. must be verified by calling 'OCRAD_get_errno' before using it.
-- Function: struct OCRAD_Descriptor * OCRAD_open ( void ) -- Function: struct OCRAD_Descriptor * OCRAD_open ( void )
Initializes the internal library state and returns a pointer that Initializes the internal library state and returns a pointer that
can only be used as the OCRDES argument for the other OCRAD can only be used as the OCRDES argument for the other OCRAD
functions, or a null pointer if the descriptor could not be functions, or a null pointer if the descriptor could not be
skipping to change at line 326 skipping to change at line 449
-- Function: int OCRAD_result_first_character ( struct -- Function: int OCRAD_result_first_character ( struct
OCRAD_Descriptor * const OCRDES ) OCRAD_Descriptor * const OCRDES )
Returns the byte result for the first character in the image. Returns the byte result for the first character in the image.
Returns 0 if the image has no characters or if the first character Returns 0 if the image has no characters or if the first character
could not be recognized. This function is a convenient short cut could not be recognized. This function is a convenient short cut
to the result for images containing a single character. to the result for images containing a single character.
File: ocrad.info, Node: Library error codes, Next: Image format conversion, P rev: Library functions, Up: Top File: ocrad.info, Node: Library error codes, Next: Image format conversion, P rev: Library functions, Up: Top
5 Library error codes 7 Library error codes
********************* *********************
Most library functions return -1 or a null pointer to indicate that they Most library functions return -1 or a null pointer to indicate that they
have failed. But this return value only tells you that an error has have failed. But this return value only tells you that an error has
occurred. To find out what kind of error it was, you need to verify the occurred. To find out what kind of error it was, you need to verify the
error code by calling 'OCRAD_get_errno'. error code by calling 'OCRAD_get_errno'.
Library functions do not change the value returned by Library functions do not change the value returned by
'OCRAD_get_errno' when they succeed; thus, the value returned by 'OCRAD_get_errno' when they succeed; thus, the value returned by
'OCRAD_get_errno' after a successful call is not necessarily OCRAD_ok, 'OCRAD_get_errno' after a successful call is not necessarily OCRAD_ok,
skipping to change at line 364 skipping to change at line 487
-- Constant: enum OCRAD_Errno OCRAD_sequence_error -- Constant: enum OCRAD_Errno OCRAD_sequence_error
A library function was called in the wrong order. For example A library function was called in the wrong order. For example
'OCRAD_result_line' was called before 'OCRAD_recognize'. 'OCRAD_result_line' was called before 'OCRAD_recognize'.
-- Constant: enum OCRAD_Errno OCRAD_library_error -- Constant: enum OCRAD_Errno OCRAD_library_error
A bug was detected in the library. Please, report it (*note A bug was detected in the library. Please, report it (*note
Problems::). Problems::).
File: ocrad.info, Node: Image format conversion, Next: Algorithm, Prev: Libra ry error codes, Up: Top File: ocrad.info, Node: Image format conversion, Next: Algorithm, Prev: Libra ry error codes, Up: Top
6 Image format conversion 8 Image format conversion
************************* *************************
There are a lot of image formats, but ocrad is able to decode only three There are a lot of image formats, but ocrad is able to decode only three
of them; pbm, pgm and ppm. In this chapter you will find command of them; pbm, pgm and ppm. In this chapter you will find command
examples and advice about how to convert image files to a format that examples and advice about how to convert image files to a format that
ocrad can manage. ocrad can manage.
'.png' '.png'
Portable Network Graphics file. Use the command Portable Network Graphics file. Use the command
'pngtopnm filename.png | ocrad'. 'pngtopnm filename.png | ocrad'.
skipping to change at line 408 skipping to change at line 531
'.pnm.gz' '.pnm.gz'
Pnm file compressed with gzip. Use the command Pnm file compressed with gzip. Use the command
'gzip -cd filename.pnm.gz | ocrad' 'gzip -cd filename.pnm.gz | ocrad'
'.pnm.lz' '.pnm.lz'
Pnm file compressed with lzip. Use the command Pnm file compressed with lzip. Use the command
'lzip -cd filename.pnm.lz | ocrad' 'lzip -cd filename.pnm.lz | ocrad'
File: ocrad.info, Node: Algorithm, Next: OCR results file, Prev: Image format conversion, Up: Top File: ocrad.info, Node: Algorithm, Next: OCR results file, Prev: Image format conversion, Up: Top
7 Algorithm 9 Algorithm
*********** ***********
Ocrad is mainly a research project. Many of the algorithms ocrad uses Ocrad is mainly a research project. Many of the algorithms ocrad uses
are ad hoc, and will change in successive releases as I myself gain are ad hoc, and will change in successive releases as I myself gain
understanding about OCR issues. understanding about OCR issues.
The overall working of ocrad may be described as follows: The overall working of ocrad may be described as follows:
1) Read the image. 1) Read the image.
2) Optionally, perform some transformations (cut, rotate, scale, etc). 2) Optionally, perform some transformations (cut, rotate, scale, etc).
3) Optionally, perform layout detection. 3) Optionally, perform layout detection.
4) Remove frames and pictures. 4) Remove frames and pictures.
5) Detect characters and group them in lines. 5) Detect characters and group them in lines.
6) Recognize characters (very ad hoc; one algorithm per character). 6) Recognize characters (very ad hoc; one algorithm per character).
7) Correct some ambiguities (transform l.OOO into 1.000, etc). 7) Correct some ambiguities (transform l.OOO into 1.000, etc).
8) Output result. 8) Optionally, apply one or more filters to the text.
9) Output text result.
Ocrad recognizes characters by its shape, and the reason it is so Ocrad recognizes characters by its shape, and the reason it is so
fast is that it does not compare the shape of every character against fast is that it does not compare the shape of every character against
some sort of database of shapes and then chooses the best match. some sort of database of shapes and then chooses the best match.
Instead of this, ocrad only compares the shape differences that are Instead of this, ocrad only compares the shape differences that are
relevant to choose between two character categories, mostly like a relevant to choose between two character categories, mostly like a
binary search. binary search.
As there is no such thing as a free lunch, this approach has some As there is no such thing as a free lunch, this approach has some
drawbacks. It makes ocrad very sensitive to character defects, and makes drawbacks. It makes ocrad very sensitive to character defects, and makes
difficult to modify ocrad to recognize new characters. difficult to modify ocrad to recognize new characters.
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.
File: ocrad.info, Node: OCR results file, Next: Problems, Prev: Algorithm, U p: Top File: ocrad.info, Node: OCR results file, Next: Problems, Prev: Algorithm, U p: Top
8 OCR results file 10 OCR results file
****************** *******************
Calling ocrad with option '-x' produces an OCR results file (ORF), that Calling ocrad with option '-x' produces an OCR results file (ORF), that
is, a parsable file containing the OCR results. The ORF format is as is, a parsable file containing the OCR results. The ORF format is as
follows: follows:
- Any line beginning with '#' is a comment line. - Any line beginning with '#' is a comment line.
- The first non-comment line has the form 'source file FILENAME', - The first non-comment line has the form 'source file FILENAME',
where FILENAME is the name of the file being processed ('-' for where FILENAME is the name of the file being processed ('-' for
stdin). This is the only line guaranteed to exist for every input stdin). This is the only line guaranteed to exist for every input
skipping to change at line 490 skipping to change at line 610
W is the width of the bounding box. W is the width of the bounding box.
H is the height of the bounding box. H is the height of the bounding box.
G is the number of different recognition guesses for this G is the number of different recognition guesses for this
character. character.
The result characters follow after the number of guesses in the The result characters follow after the number of guesses in the
form of a comma-separated list of pairs. Every pair is formed by form of a comma-separated list of pairs. Every pair is formed by
the actual recognised char C enclosed in single quotes, followed the actual recognised char C enclosed in single quotes, followed
by the confidence value V, without space between them. The higher by the confidence value V, without space between them. The higher
the value of confidence, the more confident is the result. the value of confidence, the more confident is the result.
Running './ocrad -x test.orf examples/test.pbm' in the source Running './ocrad -x test.orf testsuite/test.pbm' in the source
directory will give you an example ORF file. directory will give you an example ORF file.
File: ocrad.info, Node: Problems, Next: Concept index, Prev: OCR results file , Up: Top File: ocrad.info, Node: Problems, Next: Concept index, Prev: OCR results file , Up: Top
9 Reporting bugs 11 Reporting bugs
**************** *****************
There are probably bugs in ocrad. There are certainly errors and There are probably bugs in ocrad. There are certainly errors and
omissions in this manual. If you report them, they will get fixed. If omissions in this manual. If you report them, they will get fixed. If
you don't, no one will ever know about them and they will remain unfixed you don't, no one will ever know about them and they will remain unfixed
for all eternity, if not longer. for all eternity, if not longer.
If you find a bug in GNU Ocrad, please send electronic mail to If you find a bug in GNU Ocrad, please send electronic mail to
<bug-ocrad@gnu.org>. Include the version number, which you can find by <bug-ocrad@gnu.org>. Include the version number, which you can find by
running 'ocrad --version'. running 'ocrad --version'.
File: ocrad.info, Node: Concept index, Prev: Problems, Up: Top File: ocrad.info, Node: Concept index, Prev: Problems, Up: Top
Concept index Concept index
************* *************
* Menu: * Menu:
* algorithm: Algorithm. (line 6) * algorithm: Algorithm. (line 6)
* bugs: Problems. (line 6) * bugs: Problems. (line 6)
* filters: Filters. (line 6)
* getting help: Problems. (line 6) * getting help: Problems. (line 6)
* image format conversion: Image format conversion. * image format conversion: Image format conversion.
(line 6) (line 6)
* input charsets: Character sets. (line 6) * input charsets: Character sets. (line 6)
* introduction: Introduction. (line 6)
* invoking: Invoking ocrad. (line 6) * invoking: Invoking ocrad. (line 6)
* library error codes: Library error codes. (line 6) * library error codes: Library error codes. (line 6)
* library functions: Library functions. (line 6) * library functions: Library functions. (line 6)
* library version: Library version. (line 6) * library version: Library version. (line 6)
* OCR results file: OCR results file. (line 6) * OCR results file: OCR results file. (line 6)
* options: Invoking ocrad. (line 6) * options: Invoking ocrad. (line 6)
* output format: Character sets. (line 6) * output format: Character sets. (line 6)
* usage: Invoking ocrad. (line 6) * usage: Invoking ocrad. (line 6)
* version: Invoking ocrad. (line 6) * version: Invoking ocrad. (line 6)
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