Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/mfx.cpp @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> 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
2
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1 /******************************************************************************
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2 ** Filename: mfx.c
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3 ** Purpose: Micro feature extraction routines
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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 "mfx.h"
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20 #include "clusttool.h" //NEEDED
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21 #include "intfx.h"
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22 #include "mfdefs.h"
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23 #include "mfoutline.h"
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24 #include "normalis.h"
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25 #include "params.h"
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27 namespace tesseract {
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29 /* old numbers corresponded to 10.0 degrees and 80.0 degrees */
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30 double_VAR(classify_min_slope, 0.414213562, "Slope below which lines are called horizontal");
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31 double_VAR(classify_max_slope, 2.414213562, "Slope above which lines are called vertical");
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33 /*----------------------------------------------------------------------------
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34 Private Function Prototypes
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35 -----------------------------------------------------------------------------*/
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37 MICROFEATURES ConvertToMicroFeatures(MFOUTLINE Outline, MICROFEATURES MicroFeatures);
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39 MicroFeature ExtractMicroFeature(MFOUTLINE Start, MFOUTLINE End);
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41 /*----------------------------------------------------------------------------
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42 Public Code
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43 ----------------------------------------------------------------------------*/
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45 /**
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46 * This routine extracts micro-features from the specified
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47 * blob and returns a list of the micro-features. All
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48 * micro-features are normalized according to the specified
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49 * line statistics.
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50 * @param Blob blob to extract micro-features from
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51 * @param cn_denorm control parameter to feature extractor
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52 * @return List of micro-features extracted from the blob.
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53 */
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54 MICROFEATURES BlobMicroFeatures(TBLOB *Blob, const DENORM &cn_denorm) {
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55 MICROFEATURES MicroFeatures;
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56 LIST Outlines;
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57 LIST RemainingOutlines;
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58
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59 if (Blob != nullptr) {
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60 Outlines = ConvertBlob(Blob);
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61
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62 RemainingOutlines = Outlines;
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63 iterate(RemainingOutlines) {
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64 auto Outline = static_cast<MFOUTLINE>(RemainingOutlines->first_node());
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65 CharNormalizeOutline(Outline, cn_denorm);
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66 }
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67
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68 RemainingOutlines = Outlines;
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69 iterate(RemainingOutlines) {
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70 auto Outline = static_cast<MFOUTLINE>(RemainingOutlines->first_node());
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71 FindDirectionChanges(Outline, classify_min_slope, classify_max_slope);
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72 MarkDirectionChanges(Outline);
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73 MicroFeatures = ConvertToMicroFeatures(Outline, MicroFeatures);
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74 }
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75 FreeOutlines(Outlines);
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76 }
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77 return MicroFeatures;
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78 } /* BlobMicroFeatures */
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79
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80 /*---------------------------------------------------------------------------
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81 Private Code
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82 ---------------------------------------------------------------------------*/
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83
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84 /**
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85 * Convert Outline to MicroFeatures
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86 * @param Outline outline to extract micro-features from
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87 * @param MicroFeatures list of micro-features to add to
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88 * @return List of micro-features with new features added to front.
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89 * @note Globals: none
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90 */
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91 MICROFEATURES ConvertToMicroFeatures(MFOUTLINE Outline, MICROFEATURES MicroFeatures) {
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92 MFOUTLINE Current;
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93 MFOUTLINE Last;
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94 MFOUTLINE First;
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95
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96 if (DegenerateOutline(Outline)) {
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97 return (MicroFeatures);
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98 }
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99
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100 First = NextExtremity(Outline);
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101 Last = First;
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102 do {
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103 Current = NextExtremity(Last);
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104 if (!PointAt(Current)->Hidden) {
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105 auto NewFeature = ExtractMicroFeature(Last, Current);
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106 MicroFeatures.push_front(NewFeature);
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107 }
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108 Last = Current;
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109 } while (Last != First);
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110
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111 return MicroFeatures;
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112 } /* ConvertToMicroFeatures */
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113
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114 /**
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115 * This routine computes the feature parameters which describe
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116 * the micro-feature that starts and Start and ends at End.
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117 * A new micro-feature is allocated, filled with the feature
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118 * parameters, and returned. The routine assumes that
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119 * Start and End are not the same point. If they are the
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120 * same point, nullptr is returned, a warning message is
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121 * printed, and the current outline is dumped to stdout.
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122 * @param Start starting point of micro-feature
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123 * @param End ending point of micro-feature
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124 * @return New micro-feature or nullptr if the feature was rejected.
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125 * @note Globals: none
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126 */
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127 MicroFeature ExtractMicroFeature(MFOUTLINE Start, MFOUTLINE End) {
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128 MFEDGEPT *P1, *P2;
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129
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130 P1 = PointAt(Start);
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131 P2 = PointAt(End);
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132
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133 MicroFeature NewFeature;
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134 NewFeature[(int)MicroFeatureParameter::MFXPosition] = AverageOf(P1->Point.x, P2->Point.x);
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135 NewFeature[(int)MicroFeatureParameter::MFYPosition] = AverageOf(P1->Point.y, P2->Point.y);
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136 NewFeature[(int)MicroFeatureParameter::MFLength] = DistanceBetween(P1->Point, P2->Point);
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137 NewFeature[(int)MicroFeatureParameter::MFDirection] = NormalizedAngleFrom(&P1->Point, &P2->Point, 1.0);
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138 NewFeature[(int)MicroFeatureParameter::MFBulge1] = 0.0f; // deprecated
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139 NewFeature[(int)MicroFeatureParameter::MFBulge2] = 0.0f; // deprecated
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140
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141 return NewFeature;
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142 } /* ExtractMicroFeature */
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143
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144 } // namespace tesseract