void nearest_neighbor(Mat_<Vec3b> img, int w1, int h1, int w2, int h2) {
	Mat_<Vec3b> result(h2, w2);
	double x_ratio = w1 / (double)w2;
	double y_ratio = h1 / (double)h2;
	double px, py;

	for (int i = 0; i < h2; i++) {
		for (int j = 0; j < w2; j++) {
			result(i, j) = 0;

		}
	}

	for (int i = 0; i < h2; i++) {
		for (int j = 0; j < w2; j++) {
			px = floor(j * x_ratio);
			py = floor(i * y_ratio);
			result(i, j) = img((int)(py),(int) px);
			//result(i+1, j+1) = img(1 + round(i/x_ratio),1 + round(j/y_ratio));
		}
	}
	imshow("result", result);
	waitKey(0);


}