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Highlights from
OpenSURF (including Image Warp)

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from OpenSURF (including Image Warp) by Dirk-Jan Kroon
SURF (Speeded Up Robust Features) image feature point detection / matching, as in SIFT

D=FastHessian_BuildDerivative(r,c,t,m,b) % This function FastHessian_BuildDerivative will .. 
function D=FastHessian_BuildDerivative(r,c,t,m,b)
% This function FastHessian_BuildDerivative will ..
%
% [D] = FastHessian_BuildDerivative( r,c,t,m,b )
%  
%  inputs,
%    r : 
%    c : 
%    t : 
%    m : 
%    b : 
%  
%  outputs,
%    D : 
%  
% Function is written by D.Kroon University of Twente ()

dx = (FastHessian_getResponse(m,r, c + 1, t) - FastHessian_getResponse(m,r, c - 1, t)) / 2;
dy = (FastHessian_getResponse(m,r + 1, c, t) - FastHessian_getResponse(m,r - 1, c, t)) / 2;
ds = (FastHessian_getResponse(t,r, c) - FastHessian_getResponse(b,r, c, t)) / 2;

D = [dx;dy;ds];

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