Computes the Kernel matrix K = kernelgauss2Dsteerable(L,a,b,alfa) Example: L = 16;% block size a = 2; % width b = 1; % height alfa = 70; % orientation (horizontal = 0; vertical = 90);
0001 % Computes the Kernel matrix 0002 % 0003 % K = kernelgauss2Dsteerable(L,a,b,alfa) 0004 % 0005 % Example: 0006 % 0007 % L = 16;% block size 0008 % a = 2; % width 0009 % b = 1; % height 0010 % alfa = 70; % orientation (horizontal = 0; vertical = 90); 0011 % 0012 function K=kernelgauss2Dsteerable(L,a,b,alfa) 0013 [x,y]=meshgrid([1:L],[1:L]); 0014 s=sin(-alfa*pi/180); 0015 c=cos(-alfa*pi/180); 0016 cc=c^2;ss=s^2;aa=a^2;bb=b^2; 0017 i=1; 0018 for xm=1:L 0019 for ym=1:L 0020 g=exp(-pi*(2*(bb-aa)*c*s*(x-xm).*(y-ym)+(bb*cc+aa*ss)*(x-xm).^2+(aa*cc+bb*ss)*(y-ym).^2)/(aa*bb)); 0021 g=g/max(max(g)); 0022 K(i,:)=g(:)'; 0023 i=i+1; 0024 end 0025 end