is an OCR (Optical Character Recognition) program. Pre-release.
| ocrad.info (ocrad-0.25-pre5) | : | ocrad.info (ocrad-0.25-pre6) |
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| File: ocrad.info, Node: Top, Next: Introduction, Up: (dir) | | File: ocrad.info, Node: Top, Next: Introduction, Up: (dir) |
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| GNU Ocrad Manual | | GNU Ocrad Manual |
| **************** | | **************** |
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| This manual is for GNU Ocrad (version 0.25-pre5, 8 January 2015). | | This manual is for GNU Ocrad (version 0.25-pre6, 19 January 2015). |
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| * Menu: | | * Menu: |
| | |
| * Introduction:: Purpose and features of GNU Ocrad | | * 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 | | * 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 |
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| Filters don't enable the recognition of characters, just filter them | | Filters don't enable the recognition of characters, just filter them |
| from the output. Use '--charset' to enable the recognition of a | | from the output. Use '--charset' to enable the recognition of a |
| character set different from the default ISO-8859-15. | | character set different from the default ISO-8859-15. |
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| Ocrad provides both built-in filters and user-defined filters. | | Ocrad provides both built-in filters and user-defined filters. |
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| 4.1 User-defined filters | | 4.1 User-defined filters |
| ======================== | | ======================== |
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| The format of a user-defined filter file (*note --user-filter::) is very | | The format of a user-defined filter file (*note --user-filter::) is very |
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| simple. Each line contains a comma-separated list of quoted characters | | 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 | | ('c'), character sets ([0-9A-Z]), character codes (U0063), or character |
| ranges (U0000 - UFFFF), and an optional conversion (an equal sign (=) | | ranges (U0000 - UFFFF), and an optional conversion (an equal sign (=) |
| followed by a quoted character or a character code). The characters in | | followed by a quoted character or a character code). The characters in |
| the list are converted to the character in the conversion. If no | | the list are converted to the character in the conversion. If no |
| conversion is specified, the character is left unmodified (converted to | | conversion is specified, the character is left unmodified (converted to |
| itself). | | itself). |
| | |
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| Any character not appearing in the file, either by itself or | | The default behaviour is to discard unlisted characters, i.e. those |
| included in a set or range, will be discarded. The destination | | characters not appearing in the file, either by themselves or included |
| character of a conversion is considered as listed by default. Every | | in a set or range. If a line containing just the word 'leave' is found |
| character may be listed more than once, even as part of different | | in the file, unlisted characters are left unmodified. If the word is |
| conversions. The last conversion affecting a given character is the one | | 'mark', unlisted characters are marked as unrecognized. |
| that is performed. | | |
| | 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. | | Character sets and quoted characters may contain escape sequences. |
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| The character '#' at begin of line or after whitespace starts a | | The character '#' at begin of line or after whitespace starts a |
| comment that extends to the end of the line. | | comment that extends to the end of the line. |
| | |
| Ranges of characters may be specified in character sets by writing | | Ranges of characters may be specified in character sets by writing |
| the starting and ending characters with a '-' between them. Thus, | | the starting and ending characters with a '-' between them. Thus, |
| '[A-Z]' matches any ASCII uppercase letter. '-' may be specified by | | '[A-Z]' matches any ASCII uppercase letter. '-' may be specified by |
| placing it first or last. ']' may be specified by placing it first. If | | placing it first or last. ']' may be specified by placing it first. If |
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| skipping to change at line 260 | | skipping to change at line 267 |
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| capital letter y with diaeresis' is specified in a set as '[\xBE]', but | | capital letter y with diaeresis' is specified in a set as '[\xBE]', but |
| its code is 'U0178'. | | its code is 'U0178'. |
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| Spaces and control characters are unaffected by filters, except that | | Spaces and control characters are unaffected by filters, except that |
| leadind, trailing, and duplicate spaces produced by the removal of other | | leadind, trailing, and duplicate spaces produced by the removal of other |
| characters will be themselves removed. | | characters will be themselves removed. |
| | |
| Here is an example user-defined filter file equivalent to the built-in | | Here is an example user-defined filter file equivalent to the built-in |
| filter 'numbers': | | filter 'numbers': |
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|
| U0000 - U00FF # remove this line to get 'numbers_only' | | leave # remove this line to get 'numbers_only' |
| 'D', 'O', 'Q', 'o' = '0' | | 'D', 'O', 'Q', 'o' = '0' |
| 'I', 'L', 'l', '|' = '1' | | 'I', 'L', 'l', '|' = '1' |
| 'Z', 'z' = '2' | | 'Z', 'z' = '2' |
| '3' | | '3' |
| 'A', 'q' = '4' | | 'A', 'q' = '4' |
| 'S', 's' = '5' | | 'S', 's' = '5' |
| 'G', 'b', U00F3 = '6' # latin small letter o with acute | | 'G', 'b', U00F3 = '6' # latin small letter o with acute |
| 'J', 'T' = '7' | | 'J', 'T' = '7' |
| '&', 'B' = '8' | | '&', 'B' = '8' |
| 'g' = '9' | | 'g' = '9' |
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