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121 lines
3.4 KiB
Groff
121 lines
3.4 KiB
Groff
'\" t
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.\" Title: unicharambigs
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.\" Author: [see the "AUTHOR" section]
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.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
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.\" Date: 02/09/2012
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.\" Manual: \ \&
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.\" Source: \ \&
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.\" Language: English
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.\"
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.TH "UNICHARAMBIGS" "5" "02/09/2012" "\ \&" "\ \&"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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unicharambigs \- Tesseract unicharset ambiguities
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.SH "DESCRIPTION"
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.sp
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The unicharambigs file (a component of traineddata, see combine_tessdata(1) ) is used by Tesseract to represent possible ambiguities between characters, or groups of characters\&.
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.sp
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The file contains a number of lines, laid out as follow:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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[num] <TAB> [char(s)] <TAB> [num] <TAB> [char(s)] <TAB> [num]
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.TS
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tab(:);
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lt lt
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lt lt
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lt lt
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lt lt
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lt lt.
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T{
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.sp
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Field one
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T}:T{
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.sp
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the number of characters contained in field two
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T}
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T{
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.sp
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Field two
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T}:T{
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.sp
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the character sequence to be replaced
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T}
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T{
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.sp
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Field three
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T}:T{
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.sp
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the number of characters contained in field four
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T}
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T{
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.sp
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Field four
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T}:T{
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.sp
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the character sequence used to replace field two
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T}
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T{
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.sp
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Field five
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T}:T{
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.sp
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contains either 1 or 0\&. 1 denotes a mandatory replacement, 0 denotes an optional replacement\&.
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T}
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.TE
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.sp 1
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.sp
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Characters appearing in fields two and four should appear in unicharset\&. The numbers in fields one and three refer to the number of unichars (not bytes)\&.
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.SH "EXAMPLE"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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2 \*(Aq \*(Aq 1 " 1
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1 m 2 r n 0
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3 i i i 1 m 0
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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In this example, all instances of the \fI2\fR character sequence \fI\*(Aq\fR\*(Aq will \fBalways\fR be replaced by the \fI1\fR character sequence \fI"\fR; a \fI1\fR character sequence \fIm\fR \fBmay\fR be replaced by the \fI2\fR character sequence \fIrn\fR, and the \fI3\fR character sequence \fBmay\fR be replaced by the \fI1\fR character sequence \fIm\fR\&.
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.SH "HISTORY"
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.sp
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The unicharambigs file first appeared in Tesseract 3\&.00; prior to that, a similar format, called DangAmbigs (\fIdangerous ambiguities\fR) was used: the format was almost identical, except only mandatory replacements could be specified, and field 5 was absent\&.
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.SH "BUGS"
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.sp
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This is a documentation "bug": it\(cqs not currently clear what should be done in the case of ligatures (such as \fIfi\fR) which may also appear as regular letters in the unicharset\&.
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.SH "SEE ALSO"
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.sp
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tesseract(1), unicharset(5)
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.SH "AUTHOR"
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.sp
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The Tesseract OCR engine was written by Ray Smith and his research groups at Hewlett Packard (1985\-1995) and Google (2006\-present)\&.
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