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annotate mupdf-source/thirdparty/tesseract/src/textord/baselinedetect.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
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: baselinedetect.h
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3 // Description: Initial Baseline Determination.
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4 // Copyright 2012 Google Inc. All Rights Reserved.
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5 // Author: rays@google.com (Ray Smith)
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6 //
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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_TEXTORD_BASELINEDETECT_H_
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20 #define TESSERACT_TEXTORD_BASELINEDETECT_H_
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22 #include "detlinefit.h"
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23 #include "points.h"
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24 #include "rect.h"
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26 struct Pix;
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28 namespace tesseract {
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30 class Textord;
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31 class BLOBNBOX_LIST;
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32 class TO_BLOCK;
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33 class TO_BLOCK_LIST;
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34 class TO_ROW;
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36 // Class to compute and hold baseline data for a TO_ROW.
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37 class BaselineRow {
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38 public:
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39 BaselineRow(double line_size, TO_ROW *to_row);
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41 const TBOX &bounding_box() const {
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42 return bounding_box_;
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43 }
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44 // Sets the TO_ROW with the output straight line.
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45 void SetupOldLineParameters(TO_ROW *row) const;
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47 // Outputs diagnostic information.
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48 void Print() const;
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49
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50 // Returns the skew angle (in radians) of the current baseline in [-pi,pi].
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51 double BaselineAngle() const;
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52 // Computes and returns the linespacing at the middle of the overlap
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53 // between this and other.
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54 double SpaceBetween(const BaselineRow &other) const;
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55 // Computes and returns the displacement of the center of the line
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56 // perpendicular to the given direction.
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57 double PerpDisp(const FCOORD &direction) const;
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58 // Computes the y coordinate at the given x using the straight baseline
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59 // defined by baseline1_ and baseline2_.
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60 double StraightYAtX(double x) const;
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61
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62 // Fits a straight baseline to the points. Returns true if it had enough
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63 // points to be reasonably sure of the fitted baseline.
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64 // If use_box_bottoms is false, baselines positions are formed by
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65 // considering the outlines of the blobs.
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66 bool FitBaseline(bool use_box_bottoms);
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67 // Modifies an existing result of FitBaseline to be parallel to the given
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68 // vector if that produces a better result.
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69 void AdjustBaselineToParallel(int debug, const FCOORD &direction);
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70 // Modifies the baseline to snap to the textline grid if the existing
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71 // result is not good enough.
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72 double AdjustBaselineToGrid(int debug, const FCOORD &direction, double line_spacing,
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73 double line_offset);
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74
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75 private:
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76 // Sets up displacement_modes_ with the top few modes of the perpendicular
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77 // distance of each blob from the given direction vector, after rounding.
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78 void SetupBlobDisplacements(const FCOORD &direction);
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79
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80 // Fits a line in the given direction to blobs that are close to the given
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81 // target_offset perpendicular displacement from the direction. The fit
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82 // error is allowed to be cheat_allowance worse than the existing fit, and
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83 // will still be used.
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84 // If cheat_allowance > 0, the new fit will be good and replace the current
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85 // fit if it has better fit (with cheat) OR its error is below
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86 // max_baseline_error_ and the old fit is marked bad.
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87 // Otherwise the new fit will only replace the old if it is really better,
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88 // or the old fit is marked bad and the new fit has sufficient points, as
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89 // well as being within the max_baseline_error_.
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90 void FitConstrainedIfBetter(int debug, const FCOORD &direction, double cheat_allowance,
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91 double target_offset);
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92 // Returns the perpendicular distance of the point from the straight
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93 // baseline.
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94 float PerpDistanceFromBaseline(const FCOORD &pt) const;
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95 // Computes the bounding box of the row.
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96 void ComputeBoundingBox();
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97
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98 // The blobs of the row to which this BaselineRow adds extra information
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parents:
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99 // during baseline fitting. Note that blobs_ could easily come from either
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parents:
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100 // a TO_ROW or a ColPartition.
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parents:
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101 BLOBNBOX_LIST *blobs_;
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102 // Bounding box of all the blobs.
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103 TBOX bounding_box_;
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parents:
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104 // Fitter used to fit lines to the blobs.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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105 DetLineFit fitter_;
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parents:
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106 // 2 points on the straight baseline.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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107 FCOORD baseline_pt1_;
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108 FCOORD baseline_pt2_;
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109 // Set of modes of displacements. They indicate preferable baseline positions.
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parents:
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110 std::vector<double> displacement_modes_;
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parents:
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111 // Quantization factor used for displacement_modes_.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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112 double disp_quant_factor_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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113 // Half the acceptance range of blob displacements for computing the
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parents:
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114 // error during a constrained fit.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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115 double fit_halfrange_;
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116 // Max baseline error before a line is regarded as fitting badly.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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117 double max_baseline_error_;
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parents:
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118 // The error of fit of the baseline.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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119 double baseline_error_;
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parents:
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120 // True if this row seems to have a good baseline.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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121 bool good_baseline_;
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parents:
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122 };
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parents:
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123
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 // Class to compute and hold baseline data for a TO_BLOCK.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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125 class BaselineBlock {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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126 public:
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parents:
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127 BaselineBlock(int debug_level, bool non_text, TO_BLOCK *block);
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128
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129 ~BaselineBlock() {
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130 for (auto row : rows_) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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131 delete row;
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132 }
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parents:
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133 }
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134
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parents:
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135 TO_BLOCK *block() const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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136 return block_;
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137 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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138 double skew_angle() const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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139 return skew_angle_;
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parents:
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140 }
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parents:
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141
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142 // Computes and returns the absolute error of the given perp_disp from the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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143 // given linespacing model.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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144 static double SpacingModelError(double perp_disp, double line_spacing, double line_offset);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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145
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parents:
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146 // Fits straight line baselines and computes the skew angle from the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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147 // median angle. Returns true if a good angle is found.
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parents:
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148 // If use_box_bottoms is false, baseline positions are formed by
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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149 // considering the outlines of the blobs.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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150 bool FitBaselinesAndFindSkew(bool use_box_bottoms);
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parents:
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151
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parents:
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152 // Refits the baseline to a constrained angle, using the stored block
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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153 // skew if good enough, otherwise the supplied default skew.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 void ParallelizeBaselines(double default_block_skew);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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155
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parents:
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156 // Sets the parameters in TO_BLOCK that are needed by subsequent processes.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 void SetupBlockParameters() const;
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parents:
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158
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parents:
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159 // Processing that is required before fitting baseline splines, but requires
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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160 // linear baselines in order to be successful:
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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161 // Removes noise if required
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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162 // Separates out underlines
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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163 // Pre-associates blob fragments.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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164 // TODO(rays/joeliu) This entire section of code is inherited from the past
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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165 // and could be improved/eliminated.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 // page_tr is used to size a debug window.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 void PrepareForSplineFitting(ICOORD page_tr, bool remove_noise);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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168
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parents:
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169 // Fits splines to the textlines, or creates fake QSPLINES from the straight
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 // baselines that are already on the TO_ROWs.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 // As a side-effect, computes the xheights of the rows and the block.
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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172 // Although x-height estimation is conceptually separate, it is part of
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 // detecting perspective distortion and therefore baseline fitting.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 void FitBaselineSplines(bool enable_splines, bool show_final_rows, Textord *textord);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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175
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parents:
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176 // Draws the (straight) baselines and final blobs colored according to
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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177 // what was discarded as noise and what is associated with each row.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 void DrawFinalRows(const ICOORD &page_tr);
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parents:
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179
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parents:
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180 // Render the generated spline baselines for this block on pix_in.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 void DrawPixSpline(Image pix_in);
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parents:
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182
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parents:
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183 private:
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parents:
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184 // Top-level line-spacing calculation. Computes an estimate of the line-
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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185 // spacing, using the current baselines in the TO_ROWS of the block, and
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parents:
diff changeset
186 // then refines it by fitting a regression line to the baseline positions
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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187 // as a function of their integer index.
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parents:
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188 // Returns true if it seems that the model is a reasonable fit to the
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parents:
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189 // observations.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 bool ComputeLineSpacing();
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parents:
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191
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parents:
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192 // Computes the deskewed vertical position of each baseline in the block 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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193 // stores them in the given vector.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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194 void ComputeBaselinePositions(const FCOORD &direction, std::vector<double> *positions);
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parents:
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195
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parents:
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196 // Computes an estimate of the line spacing of the block from the median
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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197 // of the spacings between adjacent overlapping textlines.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 void EstimateLineSpacing();
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199
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200 // Refines the line spacing of the block by fitting a regression
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201 // line to the deskewed y-position of each baseline as a function of its
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202 // estimated line index, allowing for a small error in the initial linespacing
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203 // and choosing the best available model.
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204 void RefineLineSpacing(const std::vector<double> &positions);
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205
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206 // Given an initial estimate of line spacing (m_in) and the positions of each
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207 // baseline, computes the line spacing of the block more accurately in m_out,
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208 // and the corresponding intercept in c_out, and the number of spacings seen
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209 // in index_delta. Returns the error of fit to the line spacing model.
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210 double FitLineSpacingModel(const std::vector<double> &positions, double m_in, double *m_out,
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211 double *c_out, int *index_delta);
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212
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213 // The block to which this class adds extra information used during baseline
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214 // calculation.
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215 TO_BLOCK *block_;
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216 // The rows in the block that we will be working with.
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217 std::vector<BaselineRow *> rows_;
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218 // Amount of debugging output to provide.
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219 int debug_level_;
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220 // True if the block is non-text (graphic).
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221 bool non_text_block_;
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222 // True if the block has at least one good enough baseline to compute the
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223 // skew angle and therefore skew_angle_ is valid.
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224 bool good_skew_angle_;
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225 // Angle of skew in radians using the conventional anticlockwise from x-axis.
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226 double skew_angle_;
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227 // Current best estimate line spacing in pixels perpendicular to skew_angle_.
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228 double line_spacing_;
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229 // Offset for baseline positions, in pixels. Each baseline is at
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230 // line_spacing_ * n + line_offset_ for integer n, which represents
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231 // [textline] line number in a line numbering system that has line 0 on or
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232 // at least near the x-axis. Not equal to the actual line number of a line
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233 // within a block as most blocks are not near the x-axis.
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234 double line_offset_;
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235 // The error of the line spacing model.
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236 double model_error_;
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237 };
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238
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239 class BaselineDetect {
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240 public:
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241 BaselineDetect(int debug_level, const FCOORD &page_skew, TO_BLOCK_LIST *blocks);
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242
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243 ~BaselineDetect() {
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244 for (auto block : blocks_) {
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245 delete block;
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246 }
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247 }
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248
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249 // Finds the initial baselines for each TO_ROW in each TO_BLOCK, gathers
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250 // block-wise and page-wise data to smooth small blocks/rows, and applies
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251 // smoothing based on block/page-level skew and block-level linespacing.
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252 void ComputeStraightBaselines(bool use_box_bottoms);
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253
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254 // Computes the baseline splines for each TO_ROW in each TO_BLOCK and
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255 // other associated side-effects, including pre-associating blobs, computing
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256 // x-heights and displaying debug information.
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257 // NOTE that ComputeStraightBaselines must have been called first as this
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258 // sets up data in the TO_ROWs upon which this function depends.
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259 void ComputeBaselineSplinesAndXheights(const ICOORD &page_tr, bool enable_splines,
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260 bool remove_noise, bool show_final_rows, Textord *textord);
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261
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262 private:
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263 // Average (median) skew of the blocks on the page among those that have
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264 // a good angle of their own.
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265 FCOORD page_skew_;
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266 // Amount of debug output to produce.
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267 int debug_level_;
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268 // The blocks that we are working with.
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269 std::vector<BaselineBlock *> blocks_;
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270 };
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271
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272 } // namespace tesseract
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273
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274 #endif // TESSERACT_TEXTORD_BASELINEDETECT_H_