intfx.h

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/******************************************************************************
 **  Filename:    intfx.h
 **  Purpose:     Interface to high level integer feature extractor.
 **  Author:      Robert Moss
 **  History:     Tue May 21 15:51:57 MDT 1991, RWM, Created.
 **
 **  (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   INTFX_H
#define   INTFX_H

#include "blobs.h"
#include "intproto.h"
#include "normalis.h"
#include <math.h>

class DENORM;

namespace tesseract {
class TrainingSample;
}

struct INT_FX_RESULT_STRUCT {
  inT32 Length;                  // total length of all outlines
  inT16 Xmean, Ymean;            // center of mass of all outlines
  inT16 Rx, Ry;                  // radius of gyration
  inT16 NumBL, NumCN;            // number of features extracted
  inT16 Width;                   // Width of blob in BLN coords.
  uinT8 YBottom;                 // Bottom of blob in BLN coords.
  uinT8 YTop;                    // Top of blob in BLN coords.
};

// The standard feature length
const double kStandardFeatureLength = 64.0 / 5;

void TESS_API InitIntegerFX();

// Returns a vector representing the direction of a feature with the given
// theta direction in an INT_FEATURE_STRUCT.
FCOORD FeatureDirection(uinT8 theta);

namespace tesseract {
  // Generates a TrainingSample from a TBLOB. Extracts features and sets
  // the bounding box, so classifiers that operate on the image can work.
  // TODO(rays) BlobToTrainingSample must remain a global function until
  // the FlexFx and FeatureDescription code can be removed and LearnBlob
  // made a member of Classify.
  TrainingSample* BlobToTrainingSample(
      const TBLOB& blob, bool nonlinear_norm, INT_FX_RESULT_STRUCT* fx_info,
      GenericVector<INT_FEATURE_STRUCT>* bl_features);
}

// Deprecated! Prefer tesseract::Classify::ExtractFeatures instead.
bool ExtractIntFeat(const TBLOB& blob,
                    bool nonlinear_norm,
                    INT_FEATURE_ARRAY BLFeat,
                    INT_FEATURE_ARRAY CNFeat,
                    INT_FX_RESULT_STRUCT* Results);

#endif