Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/wordrec/associate.h @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: associate.h
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3 // Description: Structs, classes, typedefs useful for the segmentation
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4 // search. Functions for scoring segmentation paths according
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5 // to their character widths, gap widths and seam cuts.
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6 // Author: Daria Antonova
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7 // Created: Mon Mar 8 11:26:43 PDT 2010
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8 //
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9 // (C) Copyright 2010, Google Inc.
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10 // Licensed under the Apache License, Version 2.0 (the "License");
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11 // you may not use this file except in compliance with the License.
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12 // You may obtain a copy of the License at
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13 // http://www.apache.org/licenses/LICENSE-2.0
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14 // Unless required by applicable law or agreed to in writing, software
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15 // distributed under the License is distributed on an "AS IS" BASIS,
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16 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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17 // See the License for the specific language governing permissions and
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18 // limitations under the License.
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19 //
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20 ///////////////////////////////////////////////////////////////////////
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21
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22 #ifndef ASSOCIATE_H
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23 #define ASSOCIATE_H
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24
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25 #include "blobs.h"
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26 #include "elst.h"
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27 #include "ratngs.h"
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28 #include "seam.h"
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29 #include "split.h"
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31 namespace tesseract {
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33 class WERD_RES;
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34
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35 // Statistics about character widths, gaps and seams.
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36 struct AssociateStats {
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37 AssociateStats() {
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38 Clear();
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39 }
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41 void Clear() {
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42 shape_cost = 0.0f;
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43 bad_shape = false;
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44 full_wh_ratio = 0.0f;
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45 full_wh_ratio_total = 0.0f;
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46 full_wh_ratio_var = 0.0f;
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47 bad_fixed_pitch_right_gap = false;
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48 bad_fixed_pitch_wh_ratio = false;
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49 gap_sum = 0;
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50 }
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51
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52 void Print() {
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53 tprintf("AssociateStats: s(%g %d)\n", shape_cost, bad_shape);
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54 }
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55
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56 float shape_cost; // cost of blob shape
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57 bool bad_shape; // true if the shape of the blob is unacceptable
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58 float full_wh_ratio; // width-to-height ratio + gap on the right
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59 float full_wh_ratio_total; // sum of width-to-height ratios
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60 // on the path terminating at this blob
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61 float full_wh_ratio_var; // variance of full_wh_ratios on the path
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62 bool bad_fixed_pitch_right_gap; // true if there is no gap before
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63 // the blob on the right
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64 bool bad_fixed_pitch_wh_ratio; // true if the blobs has width-to-height
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65 // ratio > kMaxFixedPitchCharAspectRatio
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66 int gap_sum; // sum of gaps within the blob
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67 };
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69 // Utility functions for scoring segmentation paths according to their
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70 // character widths, gap widths, seam characteristics.
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71 class AssociateUtils {
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72 public:
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73 static const float kMaxFixedPitchCharAspectRatio;
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74 static const float kMinGap;
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75
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76 // Returns outline length of the given blob is computed as:
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77 // rating_cert_scale * rating / certainty
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78 // Since from Wordrec::SegSearch() in segsearch.cpp
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79 // rating_cert_scale = -1.0 * getDict().certainty_scale / rating_scale
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80 // And from Classify::ConvertMatchesToChoices() in adaptmatch.cpp
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81 // Rating = Certainty = next.rating
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82 // Rating *= rating_scale * Results->BlobLength
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83 // Certainty *= -(getDict().certainty_scale)
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84 static inline float ComputeOutlineLength(float rating_cert_scale, const BLOB_CHOICE &b) {
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85 return rating_cert_scale * b.rating() / b.certainty();
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86 }
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87 static inline float ComputeRating(float rating_cert_scale, float cert, int width) {
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88 return static_cast<float>(width) * cert / rating_cert_scale;
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89 }
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90
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91 // Computes character widths, gaps and seams stats given the
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92 // AssociateStats of the path so far, col, row of the blob that
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93 // is being added to the path, and WERD_RES containing information
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94 // about character widths, gaps and seams.
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95 // Fills associate_cost with the combined shape, gap and seam cost
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96 // of adding a unichar from (col, row) to the path (note that since
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97 // this function could be used to compute the prioritization for
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98 // pain points, (col, row) entry might not be classified yet; thus
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99 // information in the (col, row) entry of the ratings matrix is not used).
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100 //
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101 // Note: the function assumes that word_res, stats and
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102 // associate_cost pointers are not nullptr.
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103 static void ComputeStats(int col, int row, const AssociateStats *parent_stats,
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104 int parent_path_length, bool fixed_pitch, float max_char_wh_ratio,
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105 WERD_RES *word_res, bool debug, AssociateStats *stats);
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106
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107 // Returns the width cost for fixed-pitch text.
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108 static float FixedPitchWidthCost(float norm_width, float right_gap, bool end_pos,
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109 float max_char_wh_ratio);
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110
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111 // Returns the gap cost for fixed-pitch text (penalizes vertically
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112 // overlapping components).
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113 static inline float FixedPitchGapCost(float norm_gap, bool end_pos) {
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114 return (norm_gap < 0.05 && !end_pos) ? 5.0f : 0.0f;
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115 }
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116 };
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117
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118 } // namespace tesseract
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119
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120 #endif