Method Normalize

deps/tesseract/cube/cube_object.cpp:219–256

Normalize the input word bitmap to have a minimum aspect ratio

// Normalize the input word bitmap to have a minimum aspect ratio
bool CubeObject::Normalize() {
  // create a cube search object
  CubeSearchObject *srch_obj = new CubeSearchObject(cntxt_, char_samp_);
  // Perform over-segmentation
  int seg_cnt = srch_obj->SegPtCnt();
  // Only perform normalization if segment count is large enough
  if (seg_cnt < kMinNormalizationSegmentCnt) {
    delete srch_obj;
    return true;
  }
  // compute the mean AR of the segments
  double ar_mean = 0.0;
  for (int seg_idx = 0; seg_idx <= seg_cnt; seg_idx++) {
    CharSamp *seg_samp = srch_obj->CharSample(seg_idx - 1, seg_idx);
    if (seg_samp != NULL && seg_samp->Width() > 0) {
      ar_mean += (1.0 * seg_samp->Height() / seg_samp->Width());
    }
  }
  ar_mean /= (seg_cnt + 1);
  // perform normalization if segment AR is too high
  if (ar_mean > kMinNormalizationAspectRatio) {
    // scale down the image in the y-direction to attain AR
    CharSamp *new_samp = char_samp_->Scale(char_samp_->Width(),
                                           2.0 * char_samp_->Height() / ar_mean,
                                           false);
    if (new_samp != NULL) {
      // free existing char samp if owned
      if (own_char_samp_) {
        delete char_samp_;
      }
      // update with new scaled charsamp and set ownership flag
      char_samp_ = new_samp;
      own_char_samp_ = true;
    }
  }
  delete srch_obj;
  return true;
}
}