www.pudn.com > MatlabSIFTcode_1.rar > gauss2dx.m

%Author : Scott Ettinger 
%Details: 
% 
%gauss2d(order, sig)   
% 
%Generates a normalized 2d matrix to use as a gaussian convolution filter 
%  order - size of filter matrix.  Returns an order X order matrix 
%  sig - sigma value in gaussian equation 
 
function f = gauss2dx(order,sig) 
 
f=0; 
i=0; 
j=0; 
 
%generate gaussian coefficients  
 
for x = -fix(order/2):1:fix(order/2) 
    j=j+1; 
    i=0; 
    for y = -fix(order/2):1:fix(order/2) 
        i=i+1; 
        f(i,j) = 1/2/pi*exp(-((x^2+y^2)/(2*sig^2))); 
    end 
end 
 
f = f / sum(sum(f)); %normalize filter