utils.h

#ifndef __OPENCV_FEATURES_2D_KAZE_UTILS_H__
#define __OPENCV_FEATURES_2D_KAZE_UTILS_H__

/* ************************************************************************* */
/**
 * @brief This function computes the value of a 2D Gaussian function
 * @param x X Position
 * @param y Y Position
 * @param sig Standard Deviation
 */
inline float gaussian(float x, float y, float sigma) {
  return expf(-(x*x + y*y) / (2.0f*sigma*sigma));
}

/* ************************************************************************* */
/**
 * @brief This function checks descriptor limits
 * @param x X Position
 * @param y Y Position
 * @param width Image width
 * @param height Image height
 */
inline void checkDescriptorLimits(int &x, int &y, int width, int height) {

  if (x < 0) {
    x = 0;
  }

  if (y < 0) {
    y = 0;
  }

  if (x > width - 1) {
    x = width - 1;
  }

  if (y > height - 1) {
    y = height - 1;
  }
}

#endif