samfun.m

来自「matlab平台上的图像处理源代码」· M 代码 · 共 26 行

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% generate the sample pattern for the fingerprint identification
% written by zhang_rui at Chinese Academy of Science
% E-mail:[e-mail]
% 2006/6/2
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%r=radius of smallest circle R=radius of the biggest circls
%n=number of the circle N1=first circle's sample N1 times
function S=samfun(r,R,n,N1)
S=zeros(2*R+1,2*R+1);
width=(R-r)/n;
for i=1:n
    if(i==1)
        r=r;
    else
        r=r+width;
    end
    for j=1:N1*i
        sita=2*pi*(j-1)/(N1*i);
        for k=1:width
            S(R-fix((r+k-1)*sin(sita)),R+fix((r+k-1)*cos(sita)))=255;
            %imshow(S);
        end
    end
end
%imshow(S,[]);