Simple motion

motion.c

#define NOISE_THRESHOLD 		10
#define DIFFERENCE_THRESHOLD 	0.05

BOOL hasMoved(void *previous_buffer, void *current_buffer, int WIDTH, int HEIGHT) {
	
	int total = WIDTH * HEIGHT;
	int diff_count = 0;
	int c = 0, r = 0;

	for	(c = 0; c < HEIGHT; ++c) {
		for	(r = 0; c < WIDTH; ++r) {
			int index = c*WIDTH + r;
			unsigned char prev = previous_buffer[index];
			unsigned char curr = current_buffer[index];

			if (abs(prev - curr) > NOISE_THRESHOLD) {
				diff_count++;
			}
		}	
	}

	return ((diff_count / total) > DIFFERENCE_THRESHOLD);
}