src/classify/float2int.cpp - main - githubmirror/tesseract

src/classify/float2int.cpp
105 строк4 KB
Stefan Weil
Replace C-style INT_FEATURE_ARRAY with std::array
21 июн 2026, 23:19
21 июн 2026, 23:19a4566d1
/******************************************************************************
 ** 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 {

/**
 * For each class in the unicharset, clears the corresponding
 * entry in char_norm_array.  char_norm_array is indexed by unichar_id.
 *
 * Globals:
 * - none
 *
 * @param char_norm_array array to be cleared
 */
void Classify::ClearCharNormArray(uint8_t *char_norm_array) {
  memset(char_norm_array, 0, sizeof(*char_norm_array) * unicharset.size());
} /* ClearCharNormArray */

/*---------------------------------------------------------------------------*/
/**
 * For each class in unicharset, computes the match between
 * norm_feature and the normalization protos for that class.
 * Converts this number to the range from 0 - 255 and stores it
 * into char_norm_array.  CharNormArray is indexed by unichar_id.
 *
 * Globals:
 * - PreTrainedTemplates current set of built-in templates
 *
 * @param norm_feature character normalization feature
 * @param[out] char_norm_array place to put results of size unicharset.size()
 */
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 */

/*---------------------------------------------------------------------------*/
/**
 * This routine converts each floating point pico-feature
 * in Features into integer format and saves it into
 * IntFeatures.
 *
 * Globals:
 * - none
 *
 * @param Features floating point pico-features to be converted
 * @param[out] IntFeatures array to put converted features into
 */
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