tesseract-ocr/classify/mf.cpp

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/******************************************************************************
 **     Filename:    mf.c
 **     Purpose:     Micro-feature interface to flexible feature extractor.
 **     Author:      Dan Johnson
 **     History:     Thu May 24 09:08:38 1990, DSJ, 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.
 ******************************************************************************/
#include "mf.h"

#include "featdefs.h"
#include "mfdefs.h"
#include "mfx.h"

#include <math.h>

/*---------------------------------------------------------------------------*/
FEATURE_SET ExtractMicros(TBLOB *Blob, const DENORM& denorm) {
/*
 **     Parameters:
 **             Blob            blob to extract micro-features from
 **             denorm  control parameter to feature extractor.
 **     Globals: none
 **     Operation: Call the old micro-feature extractor and then copy
 **             the features into the new format.  Then deallocate the
 **             old micro-features.
 **     Return: Micro-features for Blob.
 **     Exceptions: none
 **     History: Wed May 23 18:06:38 1990, DSJ, Created.
 */
  int NumFeatures;
  MICROFEATURES Features, OldFeatures;
  FEATURE_SET FeatureSet;
  FEATURE Feature;
  MICROFEATURE OldFeature;

  OldFeatures = (MICROFEATURES)BlobMicroFeatures(Blob, denorm);
  if (OldFeatures == NULL)
    return NULL;
  NumFeatures = count (OldFeatures);
  FeatureSet = NewFeatureSet (NumFeatures);

  Features = OldFeatures;
  iterate(Features) {
    OldFeature = (MICROFEATURE) first_node (Features);
    Feature = NewFeature (&MicroFeatureDesc);
    Feature->Params[MFDirection] = OldFeature[ORIENTATION];
    Feature->Params[MFXPosition] = OldFeature[XPOSITION];
    Feature->Params[MFYPosition] = OldFeature[YPOSITION];
    Feature->Params[MFLength] = OldFeature[MFLENGTH];

    // Bulge features are deprecated and should not be used.  Set to 0.
    Feature->Params[MFBulge1] = 0.0f;
    Feature->Params[MFBulge2] = 0.0f;

#ifndef _WIN32
    // Assert that feature parameters are well defined.
    int i;
    for (i = 0; i < Feature->Type->NumParams; i++) {
      assert (!isnan(Feature->Params[i]));
    }
#endif

    AddFeature(FeatureSet, Feature);
  }
  FreeMicroFeatures(OldFeatures);
  return (FeatureSet);

}                                /* ExtractMicros */