roberts.m

对图像进行多种分析、变化

function y=roberts(x,mode)
%------------------------------------------------------------
%   y=roberts(x,mode) is an edge extractor using Roberts method. 
%
%       x:      input image
%       mode:   mode=0 (default): using magnitude
%               mode=1: using square roots
%               mode=3: using max
%       y:      output image
%
%------------------------------------------------------------
if nargin==1, mode=0; end;
r1=[0 1;-1 0];
r2=[1 0;0 -1];

a1=conv2(x,r1,'same');
a2=conv2(x,r2,'same');

if mode==0
    y=abs(a1)+abs(a2);
elseif mode==1
    y=sqrt(a1.^2+a2.^2);
else
    y=max(abs(a1),abs(a2));
end