Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/ocrpara.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 /////////////////////////////////////////////////////////////////////
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2 // File: ocrpara.h
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3 // Description: OCR Paragraph Output Type
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4 // Author: David Eger
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5 //
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6 // (C) Copyright 2010, Google Inc.
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7 // Licensed under the Apache License, Version 2.0 (the "License");
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8 // you may not use this file except in compliance with the License.
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9 // You may obtain a copy of the License at
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 // Unless required by applicable law or agreed to in writing, software
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12 // distributed under the License is distributed on an "AS IS" BASIS,
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13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 // See the License for the specific language governing permissions and
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15 // limitations under the License.
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16 //
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17 ///////////////////////////////////////////////////////////////////////
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19 #ifndef TESSERACT_CCSTRUCT_OCRPARA_H_
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20 #define TESSERACT_CCSTRUCT_OCRPARA_H_
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22 #include "elst.h"
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24 #include <tesseract/publictypes.h>
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26 namespace tesseract {
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28 class ParagraphModel;
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30 struct PARA : public ELIST_LINK {
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31 public:
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32 PARA()
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33 : model(nullptr)
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34 , is_list_item(false)
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35 , is_very_first_or_continuation(false)
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36 , has_drop_cap(false) {}
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38 // We do not own the model, we just reference it.
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39 // model may be nullptr if there is not a good model for this paragraph.
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40 const ParagraphModel *model;
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42 bool is_list_item;
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44 // The first paragraph on a page often lacks a first line indent, but should
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45 // still be modeled by the same model as other body text paragraphs on the
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46 // page.
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47 bool is_very_first_or_continuation;
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49 // Does this paragraph begin with a drop cap?
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50 bool has_drop_cap;
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51 };
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53 ELISTIZEH(PARA)
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54
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55 // A geometric model of paragraph indentation and alignment.
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56 //
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57 // Measurements are in pixels. The meaning of the integer arguments changes
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58 // depending upon the value of justification. Distances less than or equal
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59 // to tolerance apart we take as "equivalent" for the purpose of model
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60 // matching, and in the examples below, we assume tolerance is zero.
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61 //
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62 // justification = LEFT:
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63 // margin the "ignored" margin to the left block edge.
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64 // first_indent indent from the left margin to a typical first text line.
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65 // body_indent indent from the left margin of a typical body text line.
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66 //
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67 // justification = RIGHT:
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68 // margin the "ignored" margin to the right block edge.
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69 // first_indent indent from the right margin to a typical first text line.
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70 // body_indent indent from the right margin of a typical body text line.
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71 //
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72 // justification = CENTER:
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73 // margin ignored
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74 // first_indent ignored
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75 // body_indent ignored
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76 //
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77 // ====== Extended example, assuming each letter is ten pixels wide: =======
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78 //
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79 // +--------------------------------+
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80 // | Awesome | ParagraphModel(CENTER, 0, 0, 0)
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81 // | Centered Title |
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82 // | Paragraph Detection |
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83 // | OCR TEAM |
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84 // | 10 November 2010 |
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85 // | |
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86 // | Look here, I have a paragraph.| ParagraphModel(LEFT, 0, 20, 0)
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87 // |This paragraph starts at the top|
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88 // |of the page and takes 3 lines. |
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89 // | Here I have a second paragraph| ParagraphModel(LEFT, 0, 20, 0)
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90 // |which indicates that the first |
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91 // |paragraph is not a continuation |
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92 // |from a previous page, as it is |
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93 // |indented just like this second |
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94 // |paragraph. |
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95 // | Here is a block quote. It | ParagraphModel(LEFT, 30, 0, 0)
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96 // | looks like the prior text |
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97 // | but it is indented more |
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98 // | and is fully justified. |
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99 // | So how does one deal with | ParagraphModel(LEFT, 0, 20, 0)
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100 // |centered text, block quotes, |
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101 // |normal paragraphs, and lists |
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102 // |like what follows? |
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103 // |1. Make a plan. | ParagraphModel(LEFT, 0, 0, 30)
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104 // |2. Use a heuristic, for example,| ParagraphModel(LEFT, 0, 0, 30)
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105 // | looking for lines where the |
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106 // | first word of the next line |
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107 // | would fit on the previous |
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108 // | line. |
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109 // |8. Try to implement the plan in | ParagraphModel(LEFT, 0, 0, 30)
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110 // | Python and try it out. |
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111 // |4. Determine how to fix the | ParagraphModel(LEFT, 0, 0, 30)
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112 // | mistakes. |
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113 // |5. Repeat. | ParagraphModel(LEFT, 0, 0, 30)
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114 // | For extra painful penalty work| ParagraphModel(LEFT, 0, 20, 0)
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115 // |you can try to identify source |
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116 // |code. Ouch! |
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117 // +--------------------------------+
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118 class TESS_API ParagraphModel {
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119 public:
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120 ParagraphModel(tesseract::ParagraphJustification justification, int margin, int first_indent,
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121 int body_indent, int tolerance)
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122 : justification_(justification)
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123 , margin_(margin)
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124 , first_indent_(first_indent)
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125 , body_indent_(body_indent)
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126 , tolerance_(tolerance) {
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127 // Make one of {first_indent, body_indent} is 0.
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128 int added_margin = first_indent;
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129 if (body_indent < added_margin) {
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130 added_margin = body_indent;
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131 }
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132 margin_ += added_margin;
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133 first_indent_ -= added_margin;
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134 body_indent_ -= added_margin;
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135 }
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136
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137 ParagraphModel()
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138 : justification_(tesseract::JUSTIFICATION_UNKNOWN)
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139 , margin_(0)
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140 , first_indent_(0)
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141 , body_indent_(0)
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142 , tolerance_(0) {}
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143
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144 // ValidFirstLine() and ValidBodyLine() take arguments describing a text line
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145 // in a block of text which we are trying to model:
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146 // lmargin, lindent: these add up to the distance from the leftmost ink
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147 // in the text line to the surrounding text block's left
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148 // edge.
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149 // rmargin, rindent: these add up to the distance from the rightmost ink
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150 // in the text line to the surrounding text block's right
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151 // edge.
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152 // The caller determines the division between "margin" and "indent", which
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153 // only actually affect whether we think the line may be centered.
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154 //
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155 // If the amount of whitespace matches the amount of whitespace expected on
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156 // the relevant side of the line (within tolerance_) we say it matches.
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157
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158 // Return whether a given text line could be a first paragraph line according
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159 // to this paragraph model.
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160 bool ValidFirstLine(int lmargin, int lindent, int rindent, int rmargin) const;
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161
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162 // Return whether a given text line could be a first paragraph line according
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163 // to this paragraph model.
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164 bool ValidBodyLine(int lmargin, int lindent, int rindent, int rmargin) const;
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165
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166 tesseract::ParagraphJustification justification() const {
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167 return justification_;
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168 }
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169 int margin() const {
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170 return margin_;
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171 }
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172 int first_indent() const {
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173 return first_indent_;
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174 }
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175 int body_indent() const {
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176 return body_indent_;
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177 }
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178 int tolerance() const {
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179 return tolerance_;
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180 }
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181 bool is_flush() const {
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182 return (justification_ == tesseract::JUSTIFICATION_LEFT ||
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183 justification_ == tesseract::JUSTIFICATION_RIGHT) &&
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184 abs(first_indent_ - body_indent_) <= tolerance_;
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185 }
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186
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187 // Return whether this model is likely to agree with the other model on most
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188 // paragraphs they are marked.
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189 bool Comparable(const ParagraphModel &other) const;
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190
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191 std::string ToString() const;
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192
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193 private:
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194 tesseract::ParagraphJustification justification_;
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195 int margin_;
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196 int first_indent_;
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197 int body_indent_;
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198 int tolerance_;
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199 };
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200
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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201 } // namespace tesseract
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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202
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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203 #endif // TESSERACT_CCSTRUCT_OCRPARA_H_