mirror of http://192.168.1.51:8099/lmh188/twain3.0
94 lines
3.6 KiB
C++
94 lines
3.6 KiB
C++
/**********************************************************************
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* File: tesseract_cube_combiner.h
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* Description: Declaration of the Tesseract & Cube results combiner Class
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* Author: Ahmad Abdulkader
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* Created: 2008
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*
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* (C) Copyright 2008, Google Inc.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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// The TesseractCubeCombiner class provides the functionality of combining
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// the recognition results of Tesseract and Cube at the word level
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#ifndef TESSERACT_CCMAIN_TESSERACT_CUBE_COMBINER_H
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#define TESSERACT_CCMAIN_TESSERACT_CUBE_COMBINER_H
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#include <string>
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#include <vector>
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#include "pageres.h"
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namespace tesseract {
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class CubeObject;
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class NeuralNet;
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class CubeRecoContext;
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class WordAltList;
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class TesseractCubeCombiner {
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public:
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explicit TesseractCubeCombiner(CubeRecoContext *cube_cntxt);
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virtual ~TesseractCubeCombiner();
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// There are 2 public methods for combining the results of tesseract
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// and cube. Both return the probability that the Tesseract result is
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// correct. The difference between the two interfaces is in how the
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// passed-in CubeObject is used.
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// The CubeObject parameter is used for 2 purposes: 1) to retrieve
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// cube's alt list, and 2) to compute cube's word cost for the
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// tesseract result. Both uses may modify the state of the
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// CubeObject (including the BeamSearch state) with a call to
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// RecognizeWord().
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float CombineResults(WERD_RES *tess_res, CubeObject *cube_obj);
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// The alt_list parameter is expected to have been extracted from the
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// CubeObject that recognized the word to be combined. The cube_obj
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// parameter passed in is a separate instance to be used only by
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// the combiner.
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float CombineResults(WERD_RES *tess_res, CubeObject *cube_obj,
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WordAltList *alt_list);
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// Public method for computing the combiner features. The agreement
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// output parameter will be true if both answers are identical,
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// false otherwise. Modifies the cube_alt_list, so no assumptions
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// should be made about its state upon return.
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bool ComputeCombinerFeatures(const std::string &tess_res,
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int tess_confidence,
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CubeObject *cube_obj,
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WordAltList *cube_alt_list,
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std::vector<double> *features,
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bool *agreement);
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// Is the word valid according to Tesseract's language model
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bool ValidWord(const std::string &str);
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// Loads the combiner neural network from file, using cube_cntxt_
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// to find path.
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bool LoadCombinerNet();
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private:
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// Normalize a UTF-8 string. Converts the UTF-8 string to UTF32 and optionally
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// strips punc and/or normalizes case and then converts back
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std::string NormalizeString(const std::string &str, bool remove_punc, bool norm_case);
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// Compares 2 strings after optionally normalizing them and or stripping
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// punctuation
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int CompareStrings(const std::string &str1, const std::string &str2, bool ignore_punc,
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bool norm_case);
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NeuralNet *combiner_net_; // pointer to the combiner NeuralNet object
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CubeRecoContext *cube_cntxt_; // used for language ID and data paths
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};
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}
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#endif // TESSERACT_CCMAIN_TESSERACT_CUBE_COMBINER_H
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