Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/doc/unicharset.5.asc @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 UNICHARSET(5)
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2 =============
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3 :doctype: manpage
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4
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5 NAME
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6 ----
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7 unicharset - character properties file used by tesseract(1)
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8
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9 DESCRIPTION
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10 -----------
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11 Tesseract's unicharset file contains information on each symbol
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12 (unichar) the Tesseract OCR engine is trained to recognize.
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13
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14 A unicharset file (i.e. 'eng.unicharset') is distributed as part of a
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15 Tesseract language pack (i.e. 'eng.traineddata'). For information on
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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16 extracting the unicharset file, see combine_tessdata(1).
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17
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18 The first line of a unicharset file contains the number of unichars in
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19 the file. After this line, each subsequent line provides information for
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20 a single unichar. The first such line contains a placeholder reserved for
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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21 the space character. Each unichar is referred to within Tesseract by its
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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22 Unichar ID, which is the line number (minus 1) within the unicharset file.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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23 Therefore, space gets unichar 0.
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24
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25 Each unichar line in the unicharset file (v2+) may have four space-separated fields:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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27 'character' 'properties' 'script' 'id'
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28
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29 Starting with Tesseract v3.02, more information may be given for each unichar:
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30
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31 'character' 'properties' 'glyph_metrics' 'script' 'other_case' 'direction' 'mirror' 'normed_form'
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32
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33 Entries:
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34
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35 'character':: The UTF-8 encoded string to be produced for this unichar.
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36 'properties':: An integer mask of character properties, one per bit.
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37 From least to most significant bit, these are: isalpha, islower, isupper,
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38 isdigit, ispunctuation.
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39 'glyph_metrics':: Ten comma-separated integers representing various standards
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40 for where this glyph is to be found within a baseline-normalized coordinate
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41 system where 128 is normalized to x-height.
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42 * min_bottom, max_bottom: the ranges where the bottom of the character can
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43 be found.
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44 * min_top, max_top: the ranges where the top of the character may be found.
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45 * min_width, max_width: horizontal width of the character.
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46 * min_bearing, max_bearing: how far from the usual start position does the
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47 leftmost part of the character begin.
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48 * min_advance, max_advance: how far from the printer's cell left do we
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49 advance to begin the next character.
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50 'script':: Name of the script (Latin, Common, Greek, Cyrillic, Han, null).
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51 'other_case':: The Unichar ID of the other case version of this character
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52 (upper or lower).
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53 'direction':: The Unicode BiDi direction of this character, as defined by
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54 ICU's enum UCharDirection. (0 = Left to Right, 1 = Right to Left,
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55 2 = European Number...)
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56 'mirror':: The Unichar ID of the BiDirectional mirror of this character.
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57 For example the mirror of open paren is close paren, but Latin Capital C
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58 has no mirror, so it remains a Latin Capital C.
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59 'normed_form':: The UTF-8 representation of a "normalized form" of this unichar
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60 for the purpose of blaming a module for errors given ground truth text.
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61 For instance, a left or right single quote may normalize to an ASCII quote.
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62
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63
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64 EXAMPLE (v2)
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65 ------------
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66 ..............
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67 ; 10 Common 46
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68 b 3 Latin 59
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69 W 5 Latin 40
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70 7 8 Common 66
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71 = 0 Common 93
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72 ..............
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73
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74 ";" is a punctuation character. Its properties are thus represented by the
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75 binary number 10000 (10 in hexadecimal).
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76
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77 "b" is an alphabetic character and a lower case character. Its properties are
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78 thus represented by the binary number 00011 (3 in hexadecimal).
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79
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80 "W" is an alphabetic character and an upper case character. Its properties are
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81 thus represented by the binary number 00101 (5 in hexadecimal).
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82
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83 "7" is just a digit. Its properties are thus represented by the binary number
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84 01000 (8 in hexadecimal).
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85
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86 "=" is not punctuation nor a digit nor an alphabetic character. Its properties
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87 are thus represented by the binary number 00000 (0 in hexadecimal).
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88
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89 Japanese or Chinese alphabetic character properties are represented by the
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90 binary number 00001 (1 in hexadecimal): they are alphabetic, but neither
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91 upper nor lower case.
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92
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93 EXAMPLE (v3.02)
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94 ---------------
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95 ..................................................................
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96 110
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97 NULL 0 NULL 0
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98 N 5 59,68,216,255,87,236,0,27,104,227 Latin 11 0 1 N
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99 Y 5 59,68,216,255,91,205,0,47,91,223 Latin 33 0 2 Y
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100 1 8 59,69,203,255,45,128,0,66,74,173 Common 3 2 3 1
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101 9 8 18,66,203,255,89,156,0,39,104,173 Common 4 2 4 9
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102 a 3 58,65,186,198,85,164,0,26,97,185 Latin 56 0 5 a
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103 . . .
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104 ..................................................................
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105
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106 CAVEATS
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107 -------
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108 Although the unicharset reader maintains the ability to read unicharsets
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109 of older formats and will assign default values to missing fields,
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110 the accuracy will be degraded.
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111
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112 Further, most other data files are indexed by the unicharset file,
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113 so changing it without re-generating the others is likely to have dire
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114 consequences.
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115
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116 HISTORY
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117 -------
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118 The unicharset format first appeared with Tesseract 2.00, which was the
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119 first version to support languages other than English. The unicharset file
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120 contained only the first two fields, and the "ispunctuation" property was
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121 absent (punctuation was regarded as "0", as "=" is in the above example.
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122
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123 SEE ALSO
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124 --------
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125 tesseract(1), combine_tessdata(1), unicharset_extractor(1)
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126
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127 <https://tesseract-ocr.github.io/tessdoc/Training-Tesseract.html>
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128
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129
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130 AUTHOR
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131 ------
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132 The Tesseract OCR engine was written by Ray Smith and his research groups
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133 at Hewlett Packard (1985-1995) and Google (2006-2018).