ocrfeatures.cpp

Go to the documentation of this file.

/******************************************************************************
 ** Filename:    ocrfeatures.cpp
 ** Purpose:     Generic definition of a feature.
 ** Author:      Dan Johnson
 **
 ** (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 Files and Type Defines
----------------------------------------------------------------------------*/
#include "ocrfeatures.h"
#include "emalloc.h"
#include "callcpp.h"
#include "scanutils.h"
 
#include <cassert>
#include <cmath>
 
/*----------------------------------------------------------------------------
              Public Code
----------------------------------------------------------------------------*/
bool AddFeature(FEATURE_SET FeatureSet, FEATURE Feature) {
  if (FeatureSet->NumFeatures >= FeatureSet->MaxNumFeatures) {
    FreeFeature(Feature);
    return false;
  }
 
  FeatureSet->Features[FeatureSet->NumFeatures++] = Feature;
  return true;
}                                /* AddFeature */
 
void FreeFeature(FEATURE Feature) { free(Feature); } /* FreeFeature */
 
void FreeFeatureSet(FEATURE_SET FeatureSet) {
  int i;
 
  if (FeatureSet) {
    for (i = 0; i < FeatureSet->NumFeatures; i++)
      FreeFeature(FeatureSet->Features[i]);
    free(FeatureSet);
  }
}                                /* FreeFeatureSet */
 
FEATURE NewFeature(const FEATURE_DESC_STRUCT* FeatureDesc) {
  FEATURE Feature;
 
  Feature = static_cast<FEATURE>(malloc(sizeof(FEATURE_STRUCT) +
                            (FeatureDesc->NumParams - 1) * sizeof(float)));
  Feature->Type = FeatureDesc;
  return (Feature);
 
}                                /* NewFeature */
 
FEATURE_SET NewFeatureSet(int NumFeatures) {
  FEATURE_SET FeatureSet;
 
  FeatureSet = static_cast<FEATURE_SET>(Emalloc (sizeof (FEATURE_SET_STRUCT) +
    (NumFeatures - 1) * sizeof (FEATURE)));
  FeatureSet->MaxNumFeatures = NumFeatures;
  FeatureSet->NumFeatures = 0;
  return (FeatureSet);
 
}                                /* NewFeatureSet */
 
static FEATURE ReadFeature(FILE* File, const FEATURE_DESC_STRUCT* FeatureDesc) {
  FEATURE Feature;
  int i;
 
  Feature = NewFeature (FeatureDesc);
  for (i = 0; i < Feature->Type->NumParams; i++) {
    ASSERT_HOST(tfscanf(File, "%f", &(Feature->Params[i])) == 1);
#ifndef _WIN32
    assert (!std::isnan(Feature->Params[i]));
#endif
  }
  return Feature;
}
 
FEATURE_SET ReadFeatureSet(FILE* File, const FEATURE_DESC_STRUCT* FeatureDesc) {
  int NumFeatures;
  ASSERT_HOST(tfscanf(File, "%d", &NumFeatures) == 1);
  ASSERT_HOST(NumFeatures >= 0);
 
  FEATURE_SET FeatureSet = NewFeatureSet(NumFeatures);
  for (int i = 0; i < NumFeatures; i++)
    AddFeature(FeatureSet, ReadFeature(File, FeatureDesc));
 
  return FeatureSet;
}
 
static void WriteFeature(FEATURE Feature, STRING* str) {
  for (int i = 0; i < Feature->Type->NumParams; i++) {
#ifndef WIN32
    assert(!std::isnan(Feature->Params[i]));
#endif
    str->add_str_double(" ", Feature->Params[i]);
  }
  *str += "\n";
}                                /* WriteFeature */
 
void WriteFeatureSet(FEATURE_SET FeatureSet, STRING* str) {
  if (FeatureSet) {
    str->add_str_int("", FeatureSet->NumFeatures);
    *str += "\n";
    for (int i = 0; i < FeatureSet->NumFeatures; i++) {
      WriteFeature(FeatureSet->Features[i], str);
    }
  }
}                                /* WriteFeatureSet */