Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/wordrec/lm_consistency.h @ 31:baeb8bdeff3a

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 13:11:30 +0200
parents b50eed0cc0ef
children
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2
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: lm_consistency.h
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3 // Description: Struct for recording consistency of the paths representing
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4 // OCR hypotheses.
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5 // Author: Rika Antonova
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6 //
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7 // (C) Copyright 2012, Google Inc.
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8 // Licensed under the Apache License, Version 2.0 (the "License");
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9 // you may not use this file except in compliance with the License.
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10 // You may obtain a copy of the License at
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11 // http://www.apache.org/licenses/LICENSE-2.0
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12 // Unless required by applicable law or agreed to in writing, software
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13 // distributed under the License is distributed on an "AS IS" BASIS,
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14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 // See the License for the specific language governing permissions and
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16 // limitations under the License.
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17 //
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18 ////////////////////////////////////////////////////////////////////////
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19
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20 #ifndef TESSERACT_WORDREC_LM_CONSISTENCY_H_
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21 #define TESSERACT_WORDREC_LM_CONSISTENCY_H_
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22
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23 #include <cstdint> // for INT16_MAX
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24 #include "dawg.h" // for EDGE_REF, NO_EDGE
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25 #include "dict.h" // for XH_GOOD, XH_INCONSISTENT, XHeightConsi...
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26
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27 class BLOB_CHOICE;
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29 namespace tesseract {
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30
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31 static const char *const XHeightConsistencyEnumName[] = {
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32 "XH_GOOD",
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33 "XH_SUBNORMAL",
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34 "XH_INCONSISTENT",
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35 };
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36
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37 // Struct for keeping track of the consistency of the path.
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38 struct LMConsistencyInfo {
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39 enum ChartypeEnum { CT_NONE, CT_ALPHA, CT_DIGIT, CT_OTHER };
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40
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41 // How much do characters have to be shifted away from normal parameters
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42 // before we say they're not normal?
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43 static const int kShiftThresh = 1;
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44
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45 // How much shifting from subscript to superscript and back
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46 // before we declare shenanigans?
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47 static const int kMaxEntropy = 1;
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48
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49 // Script positions - order important for entropy calculation.
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50 static const int kSUB = 0, kNORM = 1, kSUP = 2;
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51 static const int kNumPos = 3;
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52
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53 explicit LMConsistencyInfo(const LMConsistencyInfo *parent_info) {
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54 if (parent_info == nullptr) {
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55 // Initialize from scratch.
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56 num_alphas = 0;
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57 num_digits = 0;
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58 num_punc = 0;
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59 num_other = 0;
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60 chartype = CT_NONE;
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61 punc_ref = NO_EDGE;
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62 invalid_punc = false;
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63 num_non_first_upper = 0;
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64 num_lower = 0;
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65 script_id = 0;
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66 inconsistent_script = false;
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67 num_inconsistent_spaces = 0;
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68 inconsistent_font = false;
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69 // Initialize XHeight stats.
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70 for (int i = 0; i < kNumPos; i++) {
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71 xht_count[i] = 0;
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72 xht_count_punc[i] = 0;
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73 xht_lo[i] = 0;
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74 xht_hi[i] = 256; // kBlnCellHeight
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75 }
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76 xht_sp = -1; // This invalid value indicates that there was no parent.
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77 xpos_entropy = 0;
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78 xht_decision = XH_GOOD;
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79 } else {
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80 // Copy parent info
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81 *this = *parent_info;
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82 }
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83 }
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84 inline int NumInconsistentPunc() const {
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85 return invalid_punc ? num_punc : 0;
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86 }
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87 inline int NumInconsistentCase() const {
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88 return (num_non_first_upper > num_lower) ? num_lower : num_non_first_upper;
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89 }
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90 inline int NumInconsistentChartype() const {
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91 return (NumInconsistentPunc() + num_other +
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92 ((num_alphas > num_digits) ? num_digits : num_alphas));
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93 }
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94 inline bool Consistent() const {
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95 return (NumInconsistentPunc() == 0 && NumInconsistentCase() == 0 &&
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96 NumInconsistentChartype() == 0 && !inconsistent_script && !inconsistent_font &&
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97 !InconsistentXHeight());
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98 }
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99 inline int NumInconsistentSpaces() const {
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100 return num_inconsistent_spaces;
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101 }
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102 inline int InconsistentXHeight() const {
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103 return xht_decision == XH_INCONSISTENT;
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104 }
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105 void ComputeXheightConsistency(const BLOB_CHOICE *b, bool is_punc);
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106 float BodyMinXHeight() const {
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107 if (InconsistentXHeight()) {
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108 return 0.0f;
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109 }
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110 return xht_lo[kNORM];
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111 }
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112 float BodyMaxXHeight() const {
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113 if (InconsistentXHeight()) {
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114 return static_cast<float>(INT16_MAX);
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115 }
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116 return xht_hi[kNORM];
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117 }
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118
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119 EDGE_REF punc_ref;
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120 int num_alphas;
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121 int num_digits;
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122 int num_punc;
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123 int num_other;
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124 ChartypeEnum chartype;
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125 XHeightConsistencyEnum xht_decision;
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126 int num_non_first_upper;
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127 int num_lower;
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128 int script_id;
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129 int num_inconsistent_spaces;
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130 // Metrics clumped by position.
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131 float xht_lo[kNumPos];
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132 float xht_hi[kNumPos];
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133 int16_t xht_count[kNumPos];
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134 int16_t xht_count_punc[kNumPos];
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135 int16_t xht_sp;
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136 int16_t xpos_entropy;
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137 bool invalid_punc;
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138 bool inconsistent_script;
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139 bool inconsistent_font;
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140 };
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141
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142 } // namespace tesseract
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143
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144 #endif // TESSERACT_WORDREC_LM_CONSISTENCY_H_