tesseract-ocr/classify/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.
};

void InitIntegerFX();

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

tesseract::TrainingSample* GetIntFeatures(
    tesseract::NormalizationMode mode, TBLOB *blob,
    const DENORM& denorm);

int ExtractIntFeat(TBLOB *Blob,
                   const DENORM& denorm,
                   INT_FEATURE_ARRAY BLFeat,
                   INT_FEATURE_ARRAY CNFeat,
                   INT_FX_RESULT_STRUCT* Results,
                   inT32 *FeatureOutlineArray = 0);

uinT8 BinaryAnglePlusPi(inT32 Y, inT32 X);

int SaveFeature(INT_FEATURE_ARRAY FeatureArray,
                uinT16 FeatureNum,
                inT16 X,
                inT16 Y,
                uinT8 Theta);

uinT16 MySqrt(inT32 X, inT32 Y);

uinT8 MySqrt2(uinT16 N, uinT32 I, uinT8 *Exp);

void ClipRadius(uinT8 *RxInv, uinT8 *RxExp, uinT8 *RyInv, uinT8 *RyExp);
#endif