Function cannyFromGradient

Second, deterministic Canny phase from precomputed gradients/magnitude.

void cannyFromGradient(
  scope const(float)[] gx,
  scope const(float)[] gy,
  scope const(float)[] magnitude,
  ulong w,
  ulong h,
  float low,
  float high,
  ref ubyte[] edges
) @safe;