Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/include/tesseract/osdetect.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:
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1 // SPDX-License-Identifier: Apache-2.0
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2 // File: osdetect.h
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3 // Description: Orientation and script detection.
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4 // Author: Samuel Charron
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5 // Ranjith Unnikrishnan
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6 //
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7 // (C) Copyright 2008, 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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18 #ifndef TESSERACT_CCMAIN_OSDETECT_H_
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19 #define TESSERACT_CCMAIN_OSDETECT_H_
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21 #include "export.h" // for TESS_API
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23 #include <vector> // for std::vector
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25 namespace tesseract {
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27 class BLOBNBOX;
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28 class BLOBNBOX_CLIST;
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29 class BLOB_CHOICE_LIST;
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30 class TO_BLOCK_LIST;
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31 class UNICHARSET;
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33 class Tesseract;
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35 // Max number of scripts in ICU + "NULL" + Japanese and Korean + Fraktur
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36 const int kMaxNumberOfScripts = 116 + 1 + 2 + 1;
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38 struct OSBestResult {
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39 OSBestResult()
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40 : orientation_id(0), script_id(0), sconfidence(0.0), oconfidence(0.0) {}
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41 int orientation_id;
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42 int script_id;
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43 float sconfidence;
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44 float oconfidence;
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45 };
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47 struct OSResults {
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48 OSResults() : unicharset(nullptr) {
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49 for (int i = 0; i < 4; ++i) {
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50 for (int j = 0; j < kMaxNumberOfScripts; ++j) {
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51 scripts_na[i][j] = 0;
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52 }
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53 orientations[i] = 0;
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54 }
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55 }
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56 void update_best_orientation();
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57 // Set the estimate of the orientation to the given id.
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58 void set_best_orientation(int orientation_id);
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59 // Update/Compute the best estimate of the script assuming the given
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60 // orientation id.
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61 void update_best_script(int orientation_id);
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62 // Return the index of the script with the highest score for this orientation.
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63 TESS_API int get_best_script(int orientation_id) const;
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64 // Accumulate scores with given OSResults instance and update the best script.
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65 void accumulate(const OSResults &osr);
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66
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67 // Print statistics.
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68 void print_scores(void) const;
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69 void print_scores(int orientation_id) const;
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71 // Array holding scores for each orientation id [0,3].
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72 // Orientation ids [0..3] map to [0, 270, 180, 90] degree orientations of the
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73 // page respectively, where the values refer to the amount of clockwise
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74 // rotation to be applied to the page for the text to be upright and readable.
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75 float orientations[4];
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76 // Script confidence scores for each of 4 possible orientations.
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77 float scripts_na[4][kMaxNumberOfScripts];
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79 UNICHARSET *unicharset;
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80 OSBestResult best_result;
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81 };
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82
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83 class OrientationDetector {
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84 public:
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85 OrientationDetector(const std::vector<int> *allowed_scripts,
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86 OSResults *results);
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87 bool detect_blob(BLOB_CHOICE_LIST *scores);
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88 int get_orientation();
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89
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90 private:
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91 OSResults *osr_;
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92 const std::vector<int> *allowed_scripts_;
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93 };
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94
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95 class ScriptDetector {
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96 public:
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97 ScriptDetector(const std::vector<int> *allowed_scripts, OSResults *osr,
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98 tesseract::Tesseract *tess);
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99 void detect_blob(BLOB_CHOICE_LIST *scores);
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100 bool must_stop(int orientation) const;
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101
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102 private:
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103 OSResults *osr_;
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104 static const char *korean_script_;
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105 static const char *japanese_script_;
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106 static const char *fraktur_script_;
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107 int korean_id_;
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108 int japanese_id_;
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109 int katakana_id_;
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110 int hiragana_id_;
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111 int han_id_;
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112 int hangul_id_;
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113 int latin_id_;
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114 int fraktur_id_;
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115 tesseract::Tesseract *tess_;
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116 const std::vector<int> *allowed_scripts_;
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117 };
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118
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119 int orientation_and_script_detection(const char *filename, OSResults *,
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120 tesseract::Tesseract *);
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121
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122 int os_detect(TO_BLOCK_LIST *port_blocks, OSResults *osr,
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123 tesseract::Tesseract *tess);
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124
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125 int os_detect_blobs(const std::vector<int> *allowed_scripts,
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126 BLOBNBOX_CLIST *blob_list, OSResults *osr,
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127 tesseract::Tesseract *tess);
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128
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129 bool os_detect_blob(BLOBNBOX *bbox, OrientationDetector *o, ScriptDetector *s,
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130 OSResults *, tesseract::Tesseract *tess);
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131
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132 // Helper method to convert an orientation index to its value in degrees.
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133 // The value represents the amount of clockwise rotation in degrees that must be
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134 // applied for the text to be upright (readable).
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135 TESS_API int OrientationIdToValue(const int &id);
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136
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137 } // namespace tesseract
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138
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139 #endif // TESSERACT_CCMAIN_OSDETECT_H_