Function InitIntegerFX

deps/tesseract/classify/intfx.cpp:55–66

---------------------------------------------------------------------------- Public Code ----------------------------------------------------------------------------**/ ---------------------------------------------------------------------------*/

----------------------------------------------------------------------------**/
/*---------------------------------------------------------------------------*/
void InitIntegerFX() {
  static bool atan_table_init = false;
  atan_table_mutex.Lock();
  if (!atan_table_init) {
    for (int i = 0; i < INT_CHAR_NORM_RANGE; ++i) {
      cos_table[i] = cos(i * 2 * PI / INT_CHAR_NORM_RANGE + PI);
      sin_table[i] = sin(i * 2 * PI / INT_CHAR_NORM_RANGE + PI);
    }
    atan_table_init = true;
  }
  atan_table_mutex.Unlock();
}

// Returns a vector representing the direction of a feature with the given
// theta direction in an INT_FEATURE_STRUCT.