int c1, c2, c3;
	for(i=1;i<SIZE-1;i++) {
		c1 = img[i-1][0] + img[i-1][1] + img[i-1][2];
		c2 = img[i][0] + img[i][1] + img[i][2];
		for(j=1;j<SIZE-1;j++) {
			c3 = img[i+1][0] + img[i+1][1] + img[i+1][2];
	        res[i][j]= (c1 + c2 + c3) / 9;
			c1 = c2;
			c2 = c3;
	    }
	}