function (inData, outData, width, height) {
        convolve3x3(inData, outData, width, height,
            [
                [-1, -1, -1],
                [-1, 8, -1],
                [-1, -1, -1]
            ],
            false, true, true);
    }
function (inData, outData, width, height) {
        convolve3x3(inData, outData, width, height,
            [
                [-1, -1, -1],
                [-1, 8, -1],
                [-1, -1, -1]
            ],
            false, true, true);
    }
function ( inData , outData , width , height ) { convolve3x3 ( inData , outData , width , height , [ [ - 1 , - 1 , - 1 ] , [ - 1 , 8 , - 1 ] , [ - 1 , - 1 , - 1 ] ] , false , true , true ) ; }
A 3x3 Laplacian edge-detect
A 3x3 Laplacian edge - detect