/usr/include/tesseract/tesseract_cube_combiner.h is in libtesseract-dev 3.02.01-6.
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* File: tesseract_cube_combiner.h
* Description: Declaration of the Tesseract & Cube results combiner Class
* Author: Ahmad Abdulkader
* Created: 2008
*
* (C) Copyright 2008, Google Inc.
** 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.
*
**********************************************************************/
// The TesseractCubeCombiner class provides the functionality of combining
// the recognition results of Tesseract and Cube at the word level
#ifndef TESSERACT_CCMAIN_TESSERACT_CUBE_COMBINER_H
#define TESSERACT_CCMAIN_TESSERACT_CUBE_COMBINER_H
#include <string>
#include <vector>
#include "pageres.h"
#ifdef __MSW32__
#include <windows.h>
using namespace std;
#endif
#ifdef USE_STD_NAMESPACE
using std::string;
using std::vector;
#endif
namespace tesseract {
class CubeObject;
class NeuralNet;
class CubeRecoContext;
class WordAltList;
class TesseractCubeCombiner {
public:
explicit TesseractCubeCombiner(CubeRecoContext *cube_cntxt);
virtual ~TesseractCubeCombiner();
// There are 2 public methods for combining the results of tesseract
// and cube. Both return the probability that the Tesseract result is
// correct. The difference between the two interfaces is in how the
// passed-in CubeObject is used.
// The CubeObject parameter is used for 2 purposes: 1) to retrieve
// cube's alt list, and 2) to compute cube's word cost for the
// tesseract result. Both uses may modify the state of the
// CubeObject (including the BeamSearch state) with a call to
// RecognizeWord().
float CombineResults(WERD_RES *tess_res, CubeObject *cube_obj);
// The alt_list parameter is expected to have been extracted from the
// CubeObject that recognized the word to be combined. The cube_obj
// parameter passed in is a separate instance to be used only by
// the combiner.
float CombineResults(WERD_RES *tess_res, CubeObject *cube_obj,
WordAltList *alt_list);
// Public method for computing the combiner features. The agreement
// output parameter will be true if both answers are identical,
// false otherwise. Modifies the cube_alt_list, so no assumptions
// should be made about its state upon return.
bool ComputeCombinerFeatures(const string &tess_res,
int tess_confidence,
CubeObject *cube_obj,
WordAltList *cube_alt_list,
vector<double> *features,
bool *agreement);
// Is the word valid according to Tesseract's language model
bool ValidWord(const string &str);
// Loads the combiner neural network from file, using cube_cntxt_
// to find path.
bool LoadCombinerNet();
private:
// Normalize a UTF-8 string. Converts the UTF-8 string to UTF32 and optionally
// strips punc and/or normalizes case and then converts back
string NormalizeString(const string &str, bool remove_punc, bool norm_case);
// Compares 2 strings after optionally normalizing them and or stripping
// punctuation
int CompareStrings(const string &str1, const string &str2, bool ignore_punc,
bool norm_case);
NeuralNet *combiner_net_; // pointer to the combiner NeuralNet object
CubeRecoContext *cube_cntxt_; // used for language ID and data paths
};
}
#endif // TESSERACT_CCMAIN_TESSERACT_CUBE_COMBINER_H
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