Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/tablerecog.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: tablerecog.h
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3 // Description: Functions to detect structure of tables.
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4 // Author: Nicholas Beato
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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 TABLERECOG_H_
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20 #define TABLERECOG_H_
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22 #include "colpartitiongrid.h"
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24 namespace tesseract {
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26 // There are 2 classes in this file. They have 2 different purposes.
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27 // - StructuredTable contains the methods to find the structure given
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28 // a specific bounding box and grow that structure.
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29 // - TableRecognizer contains the methods to adjust the possible positions
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30 // of a table without worrying about structure.
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31 //
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32 // To use these classes, the assumption is that the TableFinder will
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33 // have a guess of the location of a table (or possibly over/undersegmented
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34 // tables). The TableRecognizer is responsible for finding the table boundaries
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35 // at a high level. The StructuredTable class is responsible for determining
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36 // the structure of the table and trying to maximize its bounds while retaining
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37 // the structure.
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38 // (The latter part is not implemented yet, but that was the goal).
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39 //
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40 // While on the boundary discussion, keep in mind that this is a first pass.
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41 // There should eventually be some things like internal structure checks,
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42 // and, more importantly, surrounding text flow checks.
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43 //
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44
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45 // Usage:
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46 // The StructuredTable class contains methods to query a potential table.
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47 // It has functions to find structure, count rows, find ColPartitions that
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48 // intersect gridlines, etc. It is not meant to blindly find a table. It
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49 // is meant to start with a known table location and enhance it.
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50 // Usage:
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51 // ColPartitionGrid text_grid, line_grid; // init
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52 // TBOX table_box; // known location of table location
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53 //
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54 // StructuredTable table;
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55 // table.Init(); // construction code
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56 // table.set_text_grid(/* text */); // These 2 grids can be the same!
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57 // table.set_line_grid(/* lines */);
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58 // table.set_min_text_height(10); // Filter vertical and tall text.
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59 // // IMPORTANT! The table needs to be told where it is!
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60 // table.set_bounding_box(table_box); // Set initial table location.
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61 // if (table.FindWhitespacedStructure()) {
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62 // // process table
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63 // table.column_count(); // number of columns
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64 // table.row_count(); // number of rows
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65 // table.cells_count(); // number of cells
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66 // table.bounding_box(); // updated bounding box
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67 // // etc.
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68 // }
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69 //
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70 class TESS_API StructuredTable {
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71 public:
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72 StructuredTable();
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73 ~StructuredTable() = default;
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74
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75 // Initialization code. Must be called after the constructor.
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76 void Init();
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77
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78 // Sets the grids used by the table. These can be changed between
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79 // calls to Recognize. They are treated as read-only data.
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80 void set_text_grid(ColPartitionGrid *text);
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81 void set_line_grid(ColPartitionGrid *lines);
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82 // Filters text partitions that are ridiculously tall to prevent
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83 // merging rows.
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84 void set_max_text_height(int height);
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85
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86 // Basic accessors. Some are treated as attributes despite having indirect
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87 // representation.
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88 bool is_lined() const;
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89 unsigned row_count() const;
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90 unsigned column_count() const;
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91 unsigned cell_count() const;
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92 void set_bounding_box(const TBOX &box);
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93 const TBOX &bounding_box() const;
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94 int median_cell_height();
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95 int median_cell_width();
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96 int row_height(unsigned row) const;
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97 int column_width(unsigned column) const;
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98 int space_above() const;
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99 int space_below() const;
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100
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101 // Given enough horizontal and vertical lines in a region, create this table
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102 // based on the structure given by the lines. Return true if it worked out.
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103 // Code assumes the lines exist. It is the caller's responsibility to check
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104 // for lines and find an appropriate bounding box.
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105 bool FindLinedStructure();
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106
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107 // The main subroutine for finding generic table structure. The function
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108 // finds the grid structure in the given box. Returns true if a good grid
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109 // exists, implying that "this" table is valid.
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110 bool FindWhitespacedStructure();
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111
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112 ////////
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113 //////// Functions to query table info.
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114 ////////
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115
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116 // Returns true if inserting part into the table does not cause any
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117 // cell merges.
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118 bool DoesPartitionFit(const ColPartition &part) const;
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119 // Checks if a sub-table has multiple data cells filled.
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120 int CountFilledCells();
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121 int CountFilledCellsInRow(int row);
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122 int CountFilledCellsInColumn(int column);
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123 int CountFilledCells(unsigned row_start, unsigned row_end, unsigned column_start, unsigned column_end);
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124
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125 // Makes sure that at least one cell in a row has substantial area filled.
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126 // This can filter out large whitespace caused by growing tables too far
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127 // and page numbers.
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128 // (currently bugged for some reason).
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129 bool VerifyRowFilled(int row);
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130 // Finds the filled area in a cell.
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131 double CalculateCellFilledPercentage(unsigned row, unsigned column);
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132
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133 // Debug display, draws the table in the given color. If the table is not
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134 // valid, the table and "best" grid lines are still drawn in the given color.
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135 void Display(ScrollView *window, ScrollView::Color color);
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136
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137 protected:
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138 // Clear the structure information.
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139 void ClearStructure();
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140
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141 ////////
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142 //////// Lined tables
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143 ////////
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144
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145 // Verifies the lines do not intersect partitions. This happens when
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146 // the lines are in column boundaries and extend the full page. As a result,
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147 // the grid lines go through column text. The condition is detectable.
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148 bool VerifyLinedTableCells();
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149
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150 ////////
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151 //////// Tables with whitespace
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152 ////////
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153
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154 // This is the function to change if you want to filter resulting tables
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155 // better. Right now it just checks for a minimum cell count and such.
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156 // You could add things like maximum number of ColPartitions per cell or
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157 // similar.
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158 bool VerifyWhitespacedTable();
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159 // Find the columns of a table using whitespace.
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160 void FindWhitespacedColumns();
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161 // Find the rows of a table using whitespace.
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162 void FindWhitespacedRows();
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163
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164 ////////
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165 //////// Functions to provide information about the table.
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166 ////////
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167
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168 // Calculates the whitespace around the table using the table boundary and
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169 // the supplied grids (set_text_grid and set_line_grid).
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170 void CalculateMargins();
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171 // Update the table margins with the supplied grid. This is
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172 // only called by calculate margins to use multiple grid sources.
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173 void UpdateMargins(ColPartitionGrid *grid);
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174 int FindVerticalMargin(ColPartitionGrid *grid, int start_x, bool decrease) const;
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175 int FindHorizontalMargin(ColPartitionGrid *grid, int start_y, bool decrease) const;
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176 // Calculates stats on the table, namely the median cell height and width.
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177 void CalculateStats();
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178
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179 ////////
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180 //////// Functions to try to "fix" some table errors.
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181 ////////
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182
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183 // Given a whitespaced table, this looks for bordering lines that might
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184 // be page layout boxes around the table. It is necessary to get the margins
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185 // correct on the table. If the lines are not joined, the margins will be
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186 // the distance to the line, which is not right.
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187 void AbsorbNearbyLines();
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188
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189 // Nice utility function for finding partition gaps. You feed it a sorted
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190 // list of all of the mins/maxes of the partitions in the table, and it gives
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191 // you the gaps (middle). This works for both vertical and horizontal
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192 // gaps.
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193 //
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194 // If you want to allow slight overlap in the division and the partitions,
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195 // just scale down the partitions before inserting them in the list.
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196 // Likewise, you can force at least some space between partitions.
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197 // This trick is how the horizontal partitions are done (since the page
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198 // skew could make it hard to find splits in the text).
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199 //
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200 // As a result, "0 distance" between closest partitions causes a gap.
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201 // This is not a programmatic assumption. It is intentional and simplifies
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202 // things.
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203 //
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204 // "max_merged" indicates both the minimum number of stacked partitions
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205 // to cause a cell (add 1 to it), and the maximum number of partitions that
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206 // a grid line can intersect. For example, if max_merged is 0, then lines
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207 // are inserted wherever space exists between partitions. If it is 2,
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208 // lines may intersect 2 partitions at most, but you also need at least
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209 // 2 partitions to generate a line.
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210 static void FindCellSplitLocations(const std::vector<int> &min_list,
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211 const std::vector<int> &max_list, int max_merged,
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212 std::vector<int> *locations);
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213
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214 ////////
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215 //////// Utility function for table queries
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216 ////////
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217
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218 // Counts the number of ColPartitions that intersect vertical cell
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219 // division at this x value. Used by VerifyLinedTable.
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220 int CountVerticalIntersections(int x);
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221 int CountHorizontalIntersections(int y);
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222
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223 // Counts how many text partitions are in this box.
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224 int CountPartitions(const TBOX &box);
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225
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226 ////////
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227 //////// Data members.
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228 ////////
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229
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230 // Input data, used as read only data to make decisions.
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231 ColPartitionGrid *text_grid_; // Text ColPartitions
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232 ColPartitionGrid *line_grid_; // Line ColPartitions
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233 // Table structure.
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234 // bounding box is a convenient external representation.
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235 // cell_x_ and cell_y_ indicate the grid lines.
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236 TBOX bounding_box_; // Bounding box
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237 std::vector<int> cell_x_; // Locations of vertical divisions (sorted)
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238 std::vector<int> cell_y_; // Locations of horizontal divisions (sorted)
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239 bool is_lined_; // Is the table backed up by a line structure
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240 // Table margins, set via CalculateMargins
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241 int space_above_;
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242 int space_below_;
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243 int space_left_;
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244 int space_right_;
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245 int median_cell_height_;
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246 int median_cell_width_;
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247 // Filters, used to prevent awkward partitions from destroying structure.
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248 int max_text_height_;
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249 };
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250
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251 class TESS_API TableRecognizer {
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252 public:
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253 TableRecognizer() = default;
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254 ~TableRecognizer() = default;
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255
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256 // Initialization code. Must be called after the constructor.
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257 void Init();
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258
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259 ////////
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260 //////// Pre-recognize methods to initial table constraints.
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261 ////////
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262
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263 // Sets the grids used by the table. These can be changed between
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264 // calls to Recognize. They are treated as read-only data.
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265 void set_text_grid(ColPartitionGrid *text);
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266 void set_line_grid(ColPartitionGrid *lines);
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267 // Sets some additional constraints on the table.
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268 void set_min_height(int height);
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269 void set_min_width(int width);
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270 // Filters text partitions that are ridiculously tall to prevent
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271 // merging rows. Note that "filters" refers to allowing horizontal
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272 // cells to slice through them on the premise that they were
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273 // merged text rows during previous layout.
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274 void set_max_text_height(int height);
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275
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276 // Given a guess location, the RecognizeTable function will try to find a
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277 // structured grid in the area. On success, it will return a new
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278 // StructuredTable (and assumes you will delete it). Otherwise,
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279 // nullptr is returned.
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280 //
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281 // Keep in mind, this may "overgrow" or "undergrow" the size of guess.
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282 // Ideally, there is either a one-to-one correspondence between
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283 // the guess and table or no table at all. This is not the best of
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284 // assumptions right now, but was made to try to keep things simple in
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285 // the first pass.
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286 //
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287 // If a line structure is available on the page in the given region,
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288 // the table will use the linear structure as it is.
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289 // Otherwise, it will try to maximize the whitespace around it while keeping
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290 // a grid structure. This is somewhat working.
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291 //
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292 // Since the combination of adjustments can get high, effort was
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293 // originally made to keep the number of adjustments linear in the number
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294 // of partitions. The underlying structure finding code used to be
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295 // much more complex. I don't know how necessary this constraint is anymore.
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296 // The evaluation of a possible table is kept within O(nlogn) in the size of
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297 // the table (where size is the number of partitions in the table).
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298 // As a result, the algorithm is capable of O(n^2 log n). Depending
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299 // on the grid search size, it may be higher.
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300 //
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301 // Last note: it is possible to just try all partition boundaries at a high
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302 // level O(n^4) and do a verification scheme (at least O(nlogn)). If there
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303 // area 200 partitions on a page, this could be too costly. Effort could go
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304 // into pruning the search, but I opted for something quicker. I'm confident
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305 // that the independent adjustments can get similar results and keep the
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306 // complextiy down. However, the other approach could work without using
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307 // TableFinder at all if it is fast enough. It comes down to properly
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308 // deciding what is a table. The code currently relies on TableFinder's
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309 // guess to the location of a table for that.
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310 StructuredTable *RecognizeTable(const TBOX &guess_box);
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311
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312 protected:
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313 ////////
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314 //////// Lined tables
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315 ////////
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316
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317 // Returns true if the given box has a lined table within it. The
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318 // table argument will be updated with the table if the table exists.
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319 bool RecognizeLinedTable(const TBOX &guess_box, StructuredTable *table);
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320 // Returns true if the given box has a large number of horizontal and
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321 // vertical lines present. If so, we assume the extent of these lines
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322 // uniquely defines a table and find that table via SolveLinedTable.
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323 bool HasSignificantLines(const TBOX &guess);
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324
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325 // Given enough horizontal and vertical lines in a region, find a bounding
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326 // box that encloses all of them (as well as newly introduced lines).
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327 // The bounding box is the smallest box that encloses the lines in guess
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328 // without having any lines sticking out of it.
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329 // bounding_box is an in/out parameter.
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330 // On input, it in the extents of the box to search.
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331 // On output, it is the resulting bounding box.
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332 bool FindLinesBoundingBox(TBOX *bounding_box);
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333 // Iteration in above search.
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334 // bounding_box is an in/out parameter.
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335 // On input, it in the extents of the box to search.
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336 // On output, it is the resulting bounding box.
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337 bool FindLinesBoundingBoxIteration(TBOX *bounding_box);
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338
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339 ////////
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340 //////// Generic "whitespaced" tables
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341 ////////
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342
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343 // Returns true if the given box has a whitespaced table within it. The
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344 // table argument will be updated if the table exists. Also note
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345 // that this method will fail if the guess_box center is not
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346 // mostly within the table.
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347 bool RecognizeWhitespacedTable(const TBOX &guess_box, StructuredTable *table);
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348
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349 // Finds the location of a horizontal split relative to y.
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350 // This function is mostly unused now. If the SolveWhitespacedTable
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351 // changes much, it can be removed. Note, it isn't really as reliable
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352 // as I thought. I went with alternatives for most of the other uses.
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353 int NextHorizontalSplit(int left, int right, int y, bool top_to_bottom);
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354
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355 // Input data, used as read only data to make decisions.
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356 ColPartitionGrid *text_grid_ = nullptr; // Text ColPartitions
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357 ColPartitionGrid *line_grid_ = nullptr; // Line ColPartitions
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358 // Table constraints, a "good" table must satisfy these.
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359 int min_height_ = 0;
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360 int min_width_ = 0;
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361 // Filters, used to prevent awkward partitions from destroying structure.
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362 int max_text_height_ = INT32_MAX; // Horizontal lines may intersect taller text.
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363 };
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364
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365 } // namespace tesseract
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366
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367 #endif /* TABLERECOG_H_ */