if (gaussian_radius < 1e-3) {
val = (x == 0 && y == 0) ? 1.0f : 0.0f;
} else {
- float z = hypot(x, y) / gaussian_radius;
- val = exp(-z * z);
+ val = exp(-(x*x + y*y) / (2.0 * gaussian_radius * gaussian_radius));
}
gaussian_h(y + 2 * R, x + 2 * R) = val;
}