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Diffstat (limited to 'tesseract/src/classify/intmatcher.h')
| -rw-r--r-- | tesseract/src/classify/intmatcher.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/tesseract/src/classify/intmatcher.h b/tesseract/src/classify/intmatcher.h new file mode 100644 index 00000000..8c6a1251 --- /dev/null +++ b/tesseract/src/classify/intmatcher.h @@ -0,0 +1,165 @@ +/****************************************************************************** + ** Filename: intmatcher.h + ** Purpose: Interface to high level generic classifier routines. + ** Author: Robert Moss + ** + ** (c) Copyright Hewlett-Packard Company, 1988. + ** Licensed under the Apache License, Version 2.0 (the "License"); + ** you may not use this file except in compliance with the License. + ** You may obtain a copy of the License at + ** http://www.apache.org/licenses/LICENSE-2.0 + ** Unless required by applicable law or agreed to in writing, software + ** distributed under the License is distributed on an "AS IS" BASIS, + ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + ** See the License for the specific language governing permissions and + ** limitations under the License. + ******************************************************************************/ +#ifndef INTMATCHER_H +#define INTMATCHER_H + +#include "params.h" +#include "intproto.h" + +namespace tesseract { + +// Character fragments could be present in the trained templaes +// but turned on/off on the language-by-language basis or depending +// on particular properties of the corpus (e.g. when we expect the +// images to have low exposure). +extern BOOL_VAR_H(disable_character_fragments, false, + "Do not include character fragments in the" + " results of the classifier"); + +extern INT_VAR_H(classify_integer_matcher_multiplier, 10, + "Integer Matcher Multiplier 0-255: "); + +struct UnicharRating; + +struct CP_RESULT_STRUCT { + CP_RESULT_STRUCT() : Rating(0.0f), Class(0) {} + + float Rating; + CLASS_ID Class; +}; + + +/**---------------------------------------------------------------------------- + Public Function Prototypes +----------------------------------------------------------------------------**/ + +#define SE_TABLE_BITS 9 +#define SE_TABLE_SIZE 512 + +struct ScratchEvidence { + uint8_t feature_evidence_[MAX_NUM_CONFIGS]; + int sum_feature_evidence_[MAX_NUM_CONFIGS]; + uint8_t proto_evidence_[MAX_NUM_PROTOS][MAX_PROTO_INDEX]; + + void Clear(const INT_CLASS class_template); + void ClearFeatureEvidence(const INT_CLASS class_template); + void NormalizeSums(INT_CLASS ClassTemplate, int16_t NumFeatures); + void UpdateSumOfProtoEvidences( + INT_CLASS ClassTemplate, BIT_VECTOR ConfigMask); +}; + + +class IntegerMatcher { + public: + // Integer Matcher Theta Fudge (0-255). + static const int kIntThetaFudge = 128; + // Bits in Similarity to Evidence Lookup (8-9). + static const int kEvidenceTableBits = 9; + // Integer Evidence Truncation Bits (8-14). + static const int kIntEvidenceTruncBits = 14; + // Similarity to Evidence Table Exponential Multiplier. + static const float kSEExponentialMultiplier; + // Center of Similarity Curve. + static const float kSimilarityCenter; + + IntegerMatcher(tesseract::IntParam *classify_debug_level); + + void Match(INT_CLASS ClassTemplate, + BIT_VECTOR ProtoMask, + BIT_VECTOR ConfigMask, + int16_t NumFeatures, + const INT_FEATURE_STRUCT* Features, + tesseract::UnicharRating* Result, + int AdaptFeatureThreshold, + int Debug, + bool SeparateDebugWindows); + + // Applies the CN normalization factor to the given rating and returns + // the modified rating. + float ApplyCNCorrection(float rating, int blob_length, + int normalization_factor, int matcher_multiplier); + + int FindGoodProtos(INT_CLASS ClassTemplate, + BIT_VECTOR ProtoMask, + BIT_VECTOR ConfigMask, + int16_t NumFeatures, + INT_FEATURE_ARRAY Features, + PROTO_ID *ProtoArray, + int AdaptProtoThreshold, + int Debug); + + int FindBadFeatures(INT_CLASS ClassTemplate, + BIT_VECTOR ProtoMask, + BIT_VECTOR ConfigMask, + int16_t NumFeatures, + INT_FEATURE_ARRAY Features, + FEATURE_ID *FeatureArray, + int AdaptFeatureThreshold, + int Debug); + + private: + int UpdateTablesForFeature( + INT_CLASS ClassTemplate, + BIT_VECTOR ProtoMask, + BIT_VECTOR ConfigMask, + int FeatureNum, + const INT_FEATURE_STRUCT* Feature, + ScratchEvidence *evidence, + int Debug); + + int FindBestMatch(INT_CLASS ClassTemplate, + const ScratchEvidence &tables, + tesseract::UnicharRating* Result); + +#ifndef GRAPHICS_DISABLED + void DebugFeatureProtoError( + INT_CLASS ClassTemplate, + BIT_VECTOR ProtoMask, + BIT_VECTOR ConfigMask, + const ScratchEvidence &tables, + int16_t NumFeatures, + int Debug); + + void DisplayProtoDebugInfo( + INT_CLASS ClassTemplate, + BIT_VECTOR ConfigMask, + const ScratchEvidence &tables, + bool SeparateDebugWindows); + + void DisplayFeatureDebugInfo( + INT_CLASS ClassTemplate, + BIT_VECTOR ProtoMask, + BIT_VECTOR ConfigMask, + int16_t NumFeatures, + const INT_FEATURE_STRUCT* Features, + int AdaptFeatureThreshold, + int Debug, + bool SeparateDebugWindows); +#endif + + private: + tesseract::IntParam *classify_debug_level_; + uint8_t similarity_evidence_table_[SE_TABLE_SIZE]; + uint32_t evidence_table_mask_; + uint32_t mult_trunc_shift_bits_; + uint32_t table_trunc_shift_bits_; + uint32_t evidence_mult_mask_; +}; + +} // namespace tesseract + +#endif |