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* File: feature_base.h
* Description: Declaration of the Feature Base Class
* Author: Ping Ping (xiupingping), Ahmad Abdulkader
* Created: 2007
*
* (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 FeatureBase class is the base class for any Feature Extraction class
// It provided 3 pure virtual functions (to inherit):
// 1- FeatureCnt: A method to returns the count of features
// 2- ComputeFeatures: A method to compute the features for a given CharSamp
// 3- ComputeFeatureBitmap: A method to render a visualization of the features
// to a CharSamp. This is mainly used by visual-debuggers
#ifndef FEATURE_BASE_H
#define FEATURE_BASE_H
#include "char_samp.h"
#include "tuning_params.h"
namespace tesseract {
class FeatureBase {
public:
explicit FeatureBase(TuningParams *params)
: params_(params) {
}
virtual ~FeatureBase() {}
// Compute the features for a given CharSamp
virtual bool ComputeFeatures(CharSamp *char_samp, float *features) = 0;
// Render a visualization of the features to a CharSamp.
// This is mainly used by visual-debuggers
virtual CharSamp *ComputeFeatureBitmap(CharSamp *char_samp) = 0;
// Returns the count of features
virtual int FeatureCnt() = 0;
protected:
TuningParams *params_;
};
}
#endif // FEATURE_BASE_H
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