Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/ocrfeatures.h @ 41:71bcc18e306f

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MERGE: New upstream PyMuPDF v1.26.5 including MuPDF v1.26.10 BUGS: Needs some additional changes yet. Not yet tested.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 15:24:40 +0200
parents b50eed0cc0ef
children
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1 /******************************************************************************
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2 ** Filename: features.h
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3 ** Purpose: Generic definition of a feature.
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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 #ifndef FEATURES_H
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19 #define FEATURES_H
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21 #include "blobs.h"
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23 #include <cstdio>
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24 #include <string> // for std::string
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26 namespace tesseract {
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28 class DENORM;
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30 #undef Min
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31 #undef Max
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32 #define FEAT_NAME_SIZE 80
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34 // A character is described by multiple sets of extracted features. Each
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35 // set contains a number of features of a particular type, for example, a
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36 // set of bays, or a set of closures, or a set of microfeatures. Each
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37 // feature consists of a number of parameters. All features within a
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38 // feature set contain the same number of parameters. All circular
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39 // parameters are required to be the first parameters in the feature.
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41 struct PARAM_DESC {
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42 bool Circular; // true if dimension wraps around
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43 bool NonEssential; // true if dimension not used in searches
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44 float Min; // low end of range for circular dimensions
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45 float Max; // high end of range for circular dimensions
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46 float Range; // Max - Min
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47 float HalfRange; // (Max - Min)/2
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48 float MidRange; // (Max + Min)/2
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49 };
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51 struct FEATURE_DESC_STRUCT {
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52 uint16_t NumParams; // total # of params
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53 const char *ShortName; // short name for feature
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54 const PARAM_DESC *ParamDesc; // array - one per param
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55 };
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56 using FEATURE_DESC = FEATURE_DESC_STRUCT *;
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58 struct FEATURE_STRUCT {
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59 /// Constructor for a new feature of the specified type.
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60 /// @param FeatureDesc description of feature to be created.
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61 FEATURE_STRUCT(const FEATURE_DESC_STRUCT *FeatureDesc) : Type(FeatureDesc), Params(FeatureDesc->NumParams) {
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62 }
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63 ~FEATURE_STRUCT() {
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64 }
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65 const FEATURE_DESC_STRUCT *Type; // points to description of feature type
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66 std::vector<float> Params; // variable size array - params for feature
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67 };
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68 using FEATURE = FEATURE_STRUCT *;
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70 struct FEATURE_SET_STRUCT {
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71 /// Creator for a new feature set large enough to
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72 /// hold the specified number of features.
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73 /// @param NumFeatures maximum # of features to be put in feature set
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74 FEATURE_SET_STRUCT(int numFeatures) : NumFeatures(0), MaxNumFeatures(numFeatures), Features(numFeatures) {
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75 }
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77 ~FEATURE_SET_STRUCT() {
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78 for (uint16_t i = 0; i < NumFeatures; i++) {
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79 delete Features[i];
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80 }
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81 }
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83 uint16_t NumFeatures; // number of features in set
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84 uint16_t MaxNumFeatures; // maximum size of feature set
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85 std::vector<FEATURE_STRUCT *> Features; // variable size array of features
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86 };
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87 using FEATURE_SET = FEATURE_SET_STRUCT *;
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88
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89 // A generic character description as a char pointer. In reality, it will be
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90 // a pointer to some data structure. Paired feature extractors/matchers need
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91 // to agree on the data structure to be used, however, the high level
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92 // classifier does not need to know the details of this data structure.
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93 using CHAR_FEATURES = char *;
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95 /*----------------------------------------------------------------------
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96 Macros for defining the parameters of a new features
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97 ----------------------------------------------------------------------*/
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98 #define StartParamDesc(Name) const PARAM_DESC Name[] = {
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99 #define DefineParam(Circular, NonEssential, Min, Max) \
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100 {Circular, \
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101 NonEssential, \
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102 Min, \
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103 Max, \
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104 (Max) - (Min), \
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105 (((Max) - (Min)) / 2.0), \
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106 (((Max) + (Min)) / 2.0)},
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107
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108 #define EndParamDesc \
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109 } \
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110 ;
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111
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112 /*----------------------------------------------------------------------
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113 Macro for describing a new feature. The parameters of the macro
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114 are as follows:
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115
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116 DefineFeature (Name, NumLinear, NumCircular, ShortName, ParamName)
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117 ----------------------------------------------------------------------*/
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118 #define DefineFeature(Name, NL, NC, SN, PN) \
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119 const FEATURE_DESC_STRUCT Name = {((NL) + (NC)), SN, PN};
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120
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121 /*----------------------------------------------------------------------
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122 Generic routines that work for all feature types
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123 ----------------------------------------------------------------------*/
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124 bool AddFeature(FEATURE_SET FeatureSet, FEATURE Feature);
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125
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126 FEATURE_SET ReadFeatureSet(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc);
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127
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128 void WriteFeatureSet(FEATURE_SET FeatureSet, std::string &str);
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129
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130 } // namespace tesseract
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131
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132 #endif