float2int.cpp

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/******************************************************************************
 ** Filename:    float2int.cpp
 ** Purpose:     Routines for converting float features to int 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 "float2int.h"
 
#include "classify.h"
#include "mfoutline.h"
#include "normmatch.h"
#include "picofeat.h"
 
#include "helpers.h"
 
#define MAX_INT_CHAR_NORM (INT_CHAR_NORM_RANGE - 1)
 
/*---------------------------------------------------------------------------*/
namespace tesseract {
 
void Classify::ClearCharNormArray(uint8_t *char_norm_array) {
  memset(char_norm_array, 0, sizeof(*char_norm_array) * unicharset.size());
} /* ClearCharNormArray */
 
/*---------------------------------------------------------------------------*/
void Classify::ComputeIntCharNormArray(const FEATURE_STRUCT &norm_feature,
                                       uint8_t *char_norm_array) {
  for (unsigned i = 0; i < unicharset.size(); i++) {
    if (i < PreTrainedTemplates->NumClasses) {
      int norm_adjust =
          static_cast<int>(INT_CHAR_NORM_RANGE * ComputeNormMatch(i, norm_feature, false));
      char_norm_array[i] = ClipToRange(norm_adjust, 0, MAX_INT_CHAR_NORM);
    } else {
      // Classes with no templates (eg. ambigs & ligatures) default
      // to worst match.
      char_norm_array[i] = MAX_INT_CHAR_NORM;
    }
  }
} /* ComputeIntCharNormArray */
 
/*---------------------------------------------------------------------------*/
void Classify::ComputeIntFeatures(FEATURE_SET Features, INT_FEATURE_ARRAY IntFeatures) {
  float YShift;
 
  if (classify_norm_method == baseline) {
    YShift = BASELINE_Y_SHIFT;
  } else {
    YShift = Y_SHIFT;
  }
 
  for (int Fid = 0; Fid < Features->NumFeatures; Fid++) {
    FEATURE Feature = Features->Features[Fid];
 
    IntFeatures[Fid].X = Bucket8For(Feature->Params[PicoFeatX], X_SHIFT, INT_FEAT_RANGE);
    IntFeatures[Fid].Y = Bucket8For(Feature->Params[PicoFeatY], YShift, INT_FEAT_RANGE);
    IntFeatures[Fid].Theta =
        CircBucketFor(Feature->Params[PicoFeatDir], ANGLE_SHIFT, INT_FEAT_RANGE);
    IntFeatures[Fid].CP_misses = 0;
  }
} /* ComputeIntFeatures */
 
} // namespace tesseract