 * 0.0234 ) + ( PIXEL_AT( 0, 3) * 0.0313 ) + ( PIXEL_AT( 1, 3) * 0.0234 ) + ( PIXEL_AT( 2, 3) * 0.0156 ) + ( PIXEL_AT( 3, 3) * 0.0039 );

                vec4 I = ( PIXEL_AT(-2,-2) * 0.0126 ) + ( PIXEL_AT(-1,-2) * 0.0252 ) + ( PIXEL_AT(0,-2) * 0.0314 ) + ( PIXEL_AT(1,-2) * 0.0252 ) + ( PIXEL_AT(2,-2) * 0.0126 ) +
                         ( PIXEL_AT(-2,-1) * 0.0252 ) + ( PIXEL_AT(-1,-1) * 0.0566 ) + ( PIXEL_AT(0,-1) * 0.0753 ) + ( PIXEL_AT(1,-1) * 0.0566 ) + ( PIXEL_AT(2,-1) * 0.0252 ) +
                    