Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccmain/equationdetect.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 ///////////////////////////////////////////////////////////////////////
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2 // File: equationdetect.h
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3 // Description: The equation detection class that inherits equationdetectbase.
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4 // Author: Zongyi (Joe) Liu (joeliu@google.com)
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5 //
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6 // (C) Copyright 2011, 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_CCMAIN_EQUATIONDETECT_H_
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20 #define TESSERACT_CCMAIN_EQUATIONDETECT_H_
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22 #include <tesseract/unichar.h> // for UNICHAR_ID
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23 #include "blobbox.h" // for BLOBNBOX (ptr only), BlobSpecialText...
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24 #include "equationdetectbase.h" // for EquationDetectBase
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25 #include "tesseractclass.h" // for Tesseract
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27 class TBOX;
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28 class UNICHARSET;
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30 namespace tesseract {
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32 class Tesseract;
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33 class ColPartition;
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34 class ColPartitionGrid;
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35 class ColPartitionSet;
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37 class TESS_API EquationDetect : public EquationDetectBase {
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38 public:
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39 EquationDetect(const char *equ_datapath, const char *equ_language);
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40 ~EquationDetect() override;
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42 enum IndentType { NO_INDENT, LEFT_INDENT, RIGHT_INDENT, BOTH_INDENT, INDENT_TYPE_COUNT };
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44 // Reset the lang_tesseract_ pointer. This function should be called before we
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45 // do any detector work.
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46 void SetLangTesseract(Tesseract *lang_tesseract);
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48 // Iterate over the blobs inside to_block, and set the blobs that we want to
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49 // process to BSTT_NONE. (By default, they should be BSTT_SKIP). The function
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50 // returns 0 upon success.
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51 int LabelSpecialText(TO_BLOCK *to_block) override;
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53 // Find possible equation partitions from part_grid. Should be called
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54 // after the special_text_type of blobs are set.
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55 // It returns 0 upon success.
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56 int FindEquationParts(ColPartitionGrid *part_grid, ColPartitionSet **best_columns) override;
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58 // Reset the resolution of the processing image. TEST only function.
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59 void SetResolution(const int resolution);
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61 protected:
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62 // Identify the special text type for one blob, and update its field. When
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63 // height_th is set (> 0), we will label the blob as BSTT_NONE if its height
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64 // is less than height_th.
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65 void IdentifySpecialText(BLOBNBOX *blob, const int height_th);
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67 // Estimate the type for one unichar.
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68 BlobSpecialTextType EstimateTypeForUnichar(const UNICHARSET &unicharset,
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69 const UNICHAR_ID id) const;
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71 // Compute special text type for each blobs in part_grid_.
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72 void IdentifySpecialText();
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74 // Identify blobs that we want to skip during special blob type
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75 // classification.
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76 void IdentifyBlobsToSkip(ColPartition *part);
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78 // The ColPartitions in part_grid_ maybe over-segmented, particularly in the
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79 // block equation regions. So we like to identify these partitions and merge
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80 // them before we do the searching.
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81 void MergePartsByLocation();
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83 // Staring from the seed center, we do radius search. And for partitions that
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84 // have large overlaps with seed, we remove them from part_grid_ and add into
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85 // parts_overlap. Note: this function may update the part_grid_, so if the
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86 // caller is also running ColPartitionGridSearch, use the RepositionIterator
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87 // to continue.
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88 void SearchByOverlap(ColPartition *seed, std::vector<ColPartition *> *parts_overlap);
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90 // Insert part back into part_grid_, after it absorbs some other parts.
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91 void InsertPartAfterAbsorb(ColPartition *part);
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93 // Identify the colparitions in part_grid_, label them as PT_EQUATION, and
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94 // save them into cp_seeds_.
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95 void IdentifySeedParts();
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97 // Check the blobs count for a seed region candidate.
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parents:
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98 bool CheckSeedBlobsCount(ColPartition *part);
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99
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100 // Compute the foreground pixel density for a tbox area.
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parents:
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101 float ComputeForegroundDensity(const TBOX &tbox);
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102
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103 // Check if part from seed2 label: with low math density and left indented. We
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parents:
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104 // are using two checks:
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105 // 1. If its left is aligned with any coordinates in indented_texts_left,
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parents:
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106 // which we assume have been sorted.
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parents:
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107 // 2. If its foreground density is over foreground_density_th.
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parents:
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108 bool CheckForSeed2(const std::vector<int> &indented_texts_left,
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parents:
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109 const float foreground_density_th, ColPartition *part);
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110
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111 // Count the number of values in sorted_vec that is close to val, used to
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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112 // check if a partition is aligned with text partitions.
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parents:
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113 int CountAlignment(const std::vector<int> &sorted_vec, const int val) const;
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114
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115 // Check for a seed candidate using the foreground pixel density. And we
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parents:
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116 // return true if the density is below a certain threshold, because characters
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parents:
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117 // in equation regions usually are apart with more white spaces.
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parents:
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118 bool CheckSeedFgDensity(const float density_th, ColPartition *part);
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119
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120 // A light version of SplitCPHor: instead of really doing the part split, we
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parents:
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121 // simply compute the union bounding box of each split part.
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parents:
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122 void SplitCPHorLite(ColPartition *part, std::vector<TBOX> *splitted_boxes);
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123
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124 // Split the part (horizontally), and save the split result into
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parents:
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125 // parts_splitted. Note that it is caller's responsibility to release the
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parents:
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126 // memory owns by parts_splitted. On the other hand, the part is unchanged
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127 // during this process and still owns the blobs, so do NOT call DeleteBoxes
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parents:
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128 // when freeing the colpartitions in parts_splitted.
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parents:
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129 void SplitCPHor(ColPartition *part, std::vector<ColPartition *> *parts_splitted);
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130
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131 // Check the density for a seed candidate (part) using its math density and
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parents:
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132 // italic density, returns true if the check passed.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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133 bool CheckSeedDensity(const float math_density_high, const float math_density_low,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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134 const ColPartition *part) const;
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135
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136 // Check if part is indented.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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137 IndentType IsIndented(ColPartition *part);
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parents:
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138
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parents:
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139 // Identify inline partitions from cp_seeds_, and re-label them.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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140 void IdentifyInlineParts();
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parents:
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141
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parents:
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142 // Compute the super bounding box for all colpartitions inside part_grid_.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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143 void ComputeCPsSuperBBox();
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parents:
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144
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parents:
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145 // Identify inline partitions from cp_seeds_ using the horizontal search.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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146 void IdentifyInlinePartsHorizontal();
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147
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parents:
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148 // Estimate the line spacing between two text partitions. Returns -1 if not
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parents:
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149 // enough data.
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parents:
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150 int EstimateTextPartLineSpacing();
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parents:
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151
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parents:
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152 // Identify inline partitions from cp_seeds_ using vertical search.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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153 void IdentifyInlinePartsVertical(const bool top_to_bottom, const int textPartsLineSpacing);
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154
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parents:
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155 // Check if part is an inline equation zone. This should be called after we
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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156 // identified the seed regions.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 bool IsInline(const bool search_bottom, const int textPartsLineSpacing, ColPartition *part);
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parents:
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158
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parents:
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159 // For a given seed partition, we search the part_grid_ and see if there is
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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160 // any partition can be merged with it. It returns true if the seed has been
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:
diff changeset
161 // expanded.
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:
diff changeset
162 bool ExpandSeed(ColPartition *seed);
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parents:
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163
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parents:
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164 // Starting from the seed position, we search the part_grid_
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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165 // horizontally/vertically, find all partitions that can be
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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166 // merged with seed, remove them from part_grid_, and put them into
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:
diff changeset
167 // parts_to_merge.
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:
diff changeset
168 void ExpandSeedHorizontal(const bool search_left, ColPartition *seed,
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:
diff changeset
169 std::vector<ColPartition *> *parts_to_merge);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
170 void ExpandSeedVertical(const bool search_bottom, ColPartition *seed,
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:
diff changeset
171 std::vector<ColPartition *> *parts_to_merge);
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parents:
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172
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parents:
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173 // Check if a part_box is the small neighbor of seed_box.
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:
diff changeset
174 bool IsNearSmallNeighbor(const TBOX &seed_box, const TBOX &part_box) const;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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175
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parents:
diff changeset
176 // Perform the density check for part, which we assume is nearing a seed
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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177 // partition. It returns true if the check passed.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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178 bool CheckSeedNeighborDensity(const ColPartition *part) const;
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179
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parents:
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180 // After identify the math blocks, we do one more scanning on all text
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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181 // partitions, and check if any of them is the satellite of:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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182 // math blocks: here a p is the satellite of q if:
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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183 // 1. q is the nearest vertical neighbor of p, and
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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184 // 2. y_gap(p, q) is less than a threshold, and
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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185 // 3. x_overlap(p, q) is over a threshold.
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parents:
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186 // Note that p can be the satellites of two blocks: its top neighbor and
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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187 // bottom neighbor.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 void ProcessMathBlockSatelliteParts();
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parents:
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189
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parents:
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190 // Check if part is the satellite of one/two math blocks. If it is, we return
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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191 // true, and save the blocks into math_blocks.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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192 bool IsMathBlockSatellite(ColPartition *part, std::vector<ColPartition *> *math_blocks);
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parents:
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193
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parents:
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194 // Search the nearest neighbor of part in one vertical direction as defined in
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Franz Glasner <fzglas.hg@dom66.de>
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195 // search_bottom. It returns the neighbor found that major x overlap with it,
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196 // or nullptr when not found.
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197 ColPartition *SearchNNVertical(const bool search_bottom, const ColPartition *part);
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198
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199 // Check if the neighbor with vertical distance of y_gap is a near and math
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200 // block partition.
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201 bool IsNearMathNeighbor(const int y_gap, const ColPartition *neighbor) const;
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202
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203 // Generate the tiff file name for output/debug file.
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204 void GetOutputTiffName(const char *name, std::string &image_name) const;
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205
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206 // Debugger function that renders ColPartitions on the input image, where:
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207 // parts labeled as PT_EQUATION will be painted in red, PT_INLINE_EQUATION
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208 // will be painted in green, and other parts will be painted in blue.
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209 void PaintColParts(const std::string &outfile) const;
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210
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211 // Debugger function that renders the blobs in part_grid_ over the input
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212 // image.
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213 void PaintSpecialTexts(const std::string &outfile) const;
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214
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215 // Debugger function that print the math blobs density values for a
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216 // ColPartition object.
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217 void PrintSpecialBlobsDensity(const ColPartition *part) const;
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218
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219 // The tesseract engine initialized from equation training data.
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220 Tesseract equ_tesseract_;
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221
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222 // The tesseract engine used for OCR. This pointer is passed in by the caller,
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223 // so do NOT destroy it in this class.
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224 Tesseract *lang_tesseract_;
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225
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226 // The ColPartitionGrid that we are processing. This pointer is passed in from
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227 // the caller, so do NOT destroy it in the class.
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228 ColPartitionGrid *part_grid_ = nullptr;
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229
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230 // A simple array of pointers to the best assigned column division at
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231 // each grid y coordinate. This pointer is passed in from the caller, so do
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232 // NOT destroy it in the class.
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233 ColPartitionSet **best_columns_ = nullptr;
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234
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235 // The super bounding box of all cps in the part_grid_.
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236 TBOX *cps_super_bbox_;
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237
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238 // The seed ColPartition for equation region.
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239 std::vector<ColPartition *> cp_seeds_;
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240
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241 // The resolution (dpi) of the processing image.
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242 int resolution_;
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243
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244 // The number of pages we have processed.
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245 int page_count_;
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246 };
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247
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248 } // namespace tesseract
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249
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250 #endif // TESSERACT_CCMAIN_EQUATIONDETECT_H_