Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/intmatcher.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 ** Filename: intmatcher.h
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3 ** Purpose: Interface to high level generic classifier routines.
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4 ** Author: Robert Moss
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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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17 #ifndef INTMATCHER_H
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18 #define INTMATCHER_H
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20 #include "intproto.h"
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21 #include "params.h"
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23 namespace tesseract {
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25 // Character fragments could be present in the trained templaes
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26 // but turned on/off on the language-by-language basis or depending
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27 // on particular properties of the corpus (e.g. when we expect the
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28 // images to have low exposure).
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29 extern BOOL_VAR_H(disable_character_fragments);
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31 extern INT_VAR_H(classify_integer_matcher_multiplier);
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33 struct UnicharRating;
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35 struct CP_RESULT_STRUCT {
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36 CP_RESULT_STRUCT() : Rating(0.0f), Class(0) {}
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38 float Rating;
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39 CLASS_ID Class;
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40 };
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42 /**----------------------------------------------------------------------------
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43 Public Function Prototypes
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44 ----------------------------------------------------------------------------**/
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46 #define SE_TABLE_BITS 9
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47 #define SE_TABLE_SIZE 512
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49 struct ScratchEvidence {
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50 uint8_t feature_evidence_[MAX_NUM_CONFIGS];
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51 int sum_feature_evidence_[MAX_NUM_CONFIGS];
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52 uint8_t proto_evidence_[MAX_NUM_PROTOS][MAX_PROTO_INDEX];
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54 void Clear(const INT_CLASS_STRUCT *class_template);
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55 void ClearFeatureEvidence(const INT_CLASS_STRUCT *class_template);
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56 void NormalizeSums(INT_CLASS_STRUCT *ClassTemplate, int16_t NumFeatures);
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57 void UpdateSumOfProtoEvidences(INT_CLASS_STRUCT *ClassTemplate, BIT_VECTOR ConfigMask);
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58 };
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60 class IntegerMatcher {
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61 public:
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62 // Integer Matcher Theta Fudge (0-255).
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63 static const int kIntThetaFudge = 128;
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64 // Bits in Similarity to Evidence Lookup (8-9).
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65 static const int kEvidenceTableBits = 9;
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66 // Integer Evidence Truncation Bits (8-14).
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67 static const int kIntEvidenceTruncBits = 14;
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68 // Similarity to Evidence Table Exponential Multiplier.
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69 static const float kSEExponentialMultiplier;
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70 // Center of Similarity Curve.
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71 static const float kSimilarityCenter;
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73 IntegerMatcher(tesseract::IntParam *classify_debug_level);
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75 void Match(INT_CLASS_STRUCT *ClassTemplate, BIT_VECTOR ProtoMask, BIT_VECTOR ConfigMask,
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76 int16_t NumFeatures, const INT_FEATURE_STRUCT *Features,
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77 tesseract::UnicharRating *Result, int AdaptFeatureThreshold, int Debug,
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78 bool SeparateDebugWindows);
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80 // Applies the CN normalization factor to the given rating and returns
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81 // the modified rating.
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82 float ApplyCNCorrection(float rating, int blob_length, int normalization_factor,
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83 int matcher_multiplier);
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85 int FindGoodProtos(INT_CLASS_STRUCT *ClassTemplate, BIT_VECTOR ProtoMask, BIT_VECTOR ConfigMask,
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86 int16_t NumFeatures, INT_FEATURE_ARRAY Features, PROTO_ID *ProtoArray,
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87 int AdaptProtoThreshold, int Debug);
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89 int FindBadFeatures(INT_CLASS_STRUCT *ClassTemplate, BIT_VECTOR ProtoMask, BIT_VECTOR ConfigMask,
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90 int16_t NumFeatures, INT_FEATURE_ARRAY Features, FEATURE_ID *FeatureArray,
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91 int AdaptFeatureThreshold, int Debug);
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93 private:
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94 int UpdateTablesForFeature(INT_CLASS_STRUCT *ClassTemplate, BIT_VECTOR ProtoMask, BIT_VECTOR ConfigMask,
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95 int FeatureNum, const INT_FEATURE_STRUCT *Feature,
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96 ScratchEvidence *evidence, int Debug);
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98 int FindBestMatch(INT_CLASS_STRUCT *ClassTemplate, const ScratchEvidence &tables,
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99 tesseract::UnicharRating *Result);
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100
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101 #ifndef GRAPHICS_DISABLED
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102 void DebugFeatureProtoError(INT_CLASS_STRUCT *ClassTemplate, BIT_VECTOR ProtoMask, BIT_VECTOR ConfigMask,
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103 const ScratchEvidence &tables, int16_t NumFeatures, int Debug);
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104
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105 void DisplayProtoDebugInfo(INT_CLASS_STRUCT *ClassTemplate, BIT_VECTOR ConfigMask,
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106 const ScratchEvidence &tables, bool SeparateDebugWindows);
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107
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108 void DisplayFeatureDebugInfo(INT_CLASS_STRUCT *ClassTemplate, BIT_VECTOR ProtoMask, BIT_VECTOR ConfigMask,
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109 int16_t NumFeatures, const INT_FEATURE_STRUCT *Features,
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110 int AdaptFeatureThreshold, int Debug, bool SeparateDebugWindows);
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111 #endif
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112
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113 private:
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114 tesseract::IntParam *classify_debug_level_;
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115 uint8_t similarity_evidence_table_[SE_TABLE_SIZE];
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116 uint32_t evidence_table_mask_;
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117 uint32_t mult_trunc_shift_bits_;
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118 uint32_t table_trunc_shift_bits_;
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119 uint32_t evidence_mult_mask_;
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120 };
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121
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122 } // namespace tesseract
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123
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124 #endif