Documentation>MATLAB API>IMOP - vl_dwaffine

[DWX,DWY]=VL_DWAFFINE(X,Y) returns the derivative of the 2-D affine warp [WX; WY] = [A T] [X; Y] with respect to the parameters A,T computed at points X,Y.

See also: VL_WAFFINE(), VL_HELP().