normfeat.cpp

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/******************************************************************************
 ** Filename:    normfeat.c
 ** Purpose:     Definition of char normalization features.
 ** 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 "normfeat.h"
 
#include "featdefs.h"
#include "intfx.h"
#include "mfoutline.h"
 
namespace tesseract {
 
float ActualOutlineLength(FEATURE Feature) {
  return (Feature->Params[CharNormLength] * LENGTH_COMPRESSION);
}
 
FEATURE_SET ExtractCharNormFeatures(const INT_FX_RESULT_STRUCT &fx_info) {
  auto feature_set = new FEATURE_SET_STRUCT(1);
  auto feature = new FEATURE_STRUCT(&CharNormDesc);
 
  feature->Params[CharNormY] = MF_SCALE_FACTOR * (fx_info.Ymean - kBlnBaselineOffset);
  feature->Params[CharNormLength] = MF_SCALE_FACTOR * fx_info.Length / LENGTH_COMPRESSION;
  feature->Params[CharNormRx] = MF_SCALE_FACTOR * fx_info.Rx;
  feature->Params[CharNormRy] = MF_SCALE_FACTOR * fx_info.Ry;
 
  AddFeature(feature_set, feature);
 
  return feature_set;
} /* ExtractCharNormFeatures */
 
} // namespace tesseract