www.pudn.com > SURF-based-image-stitching.rar > FastHessian_BuildDerivative.m, change:2010-07-26,size:603b


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];