Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/outfeat.cpp @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /******************************************************************************
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2 ** Filename: outfeat.c
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3 ** Purpose: Definition of outline-features.
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4 ** Author: Dan Johnson
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5 **
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6 ** (c) Copyright Hewlett-Packard Company, 1988.
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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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18 #include "outfeat.h"
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20 #include "classify.h"
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21 #include "featdefs.h"
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22 #include "mfoutline.h"
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23 #include "ocrfeatures.h"
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25 #include <cstdio>
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27 namespace tesseract {
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29 /*----------------------------------------------------------------------------
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30 Public Code
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31 ----------------------------------------------------------------------------*/
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33 /**
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34 * Convert each segment in the outline to a feature
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35 * and return the features.
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36 * @param Blob blob to extract pico-features from
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37 * @return Outline-features for Blob.
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38 * @note Globals: none
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39 */
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40 FEATURE_SET Classify::ExtractOutlineFeatures(TBLOB *Blob) {
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41 auto FeatureSet = new FEATURE_SET_STRUCT(MAX_OUTLINE_FEATURES);
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42 if (Blob == nullptr) {
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43 return (FeatureSet);
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44 }
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46 auto Outlines = ConvertBlob(Blob);
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48 float XScale, YScale;
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49 NormalizeOutlines(Outlines, &XScale, &YScale);
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50 auto RemainingOutlines = Outlines;
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51 iterate(RemainingOutlines) {
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52 auto Outline = static_cast<MFOUTLINE>(RemainingOutlines->first_node());
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53 ConvertToOutlineFeatures(Outline, FeatureSet);
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54 }
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55 if (classify_norm_method == baseline) {
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56 NormalizeOutlineX(FeatureSet);
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57 }
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58 FreeOutlines(Outlines);
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59 return (FeatureSet);
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60 } /* ExtractOutlineFeatures */
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61
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62 /*----------------------------------------------------------------------------
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63 Private Code
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64 ----------------------------------------------------------------------------*/
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65 /*---------------------------------------------------------------------------*/
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66 /**
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67 * This routine computes the midpoint between Start and
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68 * End to obtain the x,y position of the outline-feature. It
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69 * also computes the direction from Start to End as the
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70 * direction of the outline-feature and the distance from
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71 * Start to End as the length of the outline-feature.
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72 * This feature is then
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73 * inserted into the next feature slot in FeatureSet.
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74 * @param Start starting point of outline-feature
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75 * @param End ending point of outline-feature
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76 * @param FeatureSet set to add outline-feature to
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77 */
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78 void AddOutlineFeatureToSet(FPOINT *Start, FPOINT *End, FEATURE_SET FeatureSet) {
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79 auto Feature = new FEATURE_STRUCT(&OutlineFeatDesc);
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80 Feature->Params[OutlineFeatDir] = NormalizedAngleFrom(Start, End, 1.0);
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81 Feature->Params[OutlineFeatX] = AverageOf(Start->x, End->x);
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82 Feature->Params[OutlineFeatY] = AverageOf(Start->y, End->y);
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83 Feature->Params[OutlineFeatLength] = DistanceBetween(*Start, *End);
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84 AddFeature(FeatureSet, Feature);
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85
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86 } /* AddOutlineFeatureToSet */
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87
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88 /*---------------------------------------------------------------------------*/
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89 /**
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90 * This routine steps converts each section in the specified
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91 * outline to a feature described by its x,y position, length
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92 * and angle.
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93 * Results are returned in FeatureSet.
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94 * @param Outline outline to extract outline-features from
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95 * @param FeatureSet set of features to add outline-features to
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96 */
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97 void ConvertToOutlineFeatures(MFOUTLINE Outline, FEATURE_SET FeatureSet) {
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98 MFOUTLINE Next;
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99 MFOUTLINE First;
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100 FPOINT FeatureStart;
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101 FPOINT FeatureEnd;
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102
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103 if (DegenerateOutline(Outline)) {
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104 return;
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105 }
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106
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107 First = Outline;
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108 Next = First;
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109 do {
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110 FeatureStart = PointAt(Next)->Point;
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111 Next = NextPointAfter(Next);
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112
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113 /* note that an edge is hidden if the ending point of the edge is
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114 marked as hidden. This situation happens because the order of
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115 the outlines is reversed when they are converted from the old
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116 format. In the old format, a hidden edge is marked by the
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117 starting point for that edge. */
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118 if (!PointAt(Next)->Hidden) {
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119 FeatureEnd = PointAt(Next)->Point;
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120 AddOutlineFeatureToSet(&FeatureStart, &FeatureEnd, FeatureSet);
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121 }
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122 } while (Next != First);
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123 } /* ConvertToOutlineFeatures */
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124
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125 /*---------------------------------------------------------------------------*/
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126 /**
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127 * This routine computes the weighted average x position
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128 * over all of the outline-features in FeatureSet and then
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129 * renormalizes the outline-features to force this average
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130 * to be the x origin (i.e. x=0).
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131 * FeatureSet is changed.
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132 * @param FeatureSet outline-features to be normalized
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133 */
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134 void NormalizeOutlineX(FEATURE_SET FeatureSet) {
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135 int i;
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136 FEATURE Feature;
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137 float Length;
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138 float TotalX = 0.0;
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139 float TotalWeight = 0.0;
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140 float Origin;
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141
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142 if (FeatureSet->NumFeatures <= 0) {
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143 return;
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144 }
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145
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146 for (i = 0; i < FeatureSet->NumFeatures; i++) {
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147 Feature = FeatureSet->Features[i];
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148 Length = Feature->Params[OutlineFeatLength];
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149 TotalX += Feature->Params[OutlineFeatX] * Length;
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150 TotalWeight += Length;
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151 }
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152 Origin = TotalX / TotalWeight;
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153
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154 for (i = 0; i < FeatureSet->NumFeatures; i++) {
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155 Feature = FeatureSet->Features[i];
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156 Feature->Params[OutlineFeatX] -= Origin;
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157 }
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158 } /* NormalizeOutlineX */
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159
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160 } // namespace tesseract