Steerable 2D Gaussian derivative filter (for visualization). This function is a demonstration of steerable filters. The directional derivative of G in an arbitrary direction theta can be found by taking a linear combination of the directional derivatives dxG and dyG. USAGE filterSteerable( theta ) INPUTS theta - orientation in radians OUTPUTS EXAMPLE filterSteerable( pi/4 ); See also filterGauss Piotr's Image&Video Toolbox Version 2.0 Copyright 2008 Piotr Dollar. [pdollar-at-caltech.edu] Please email me if you find bugs, or have suggestions or questions! Licensed under the Lesser GPL [see external/lgpl.txt]