matrix_nc.m

用matlab实现的DCT水印处理

function y=matrix_nc(w,v)
%------------------------计算两个矩阵的相似度系数----------------------------
%------------------------NOTES---------------------------------------------
% Written by : zj  - 01/05/07
% Contact    : [e-mail]
% CpoyRight@2007-2010
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
[wrow,wcol]=size(w);
[vrow,vcol]=size(v);
if wrow<1||wcol<1||vrow<1||vcol<1
    error('输入有误--------维数不能小于一');
elseif wrow~=vrow||wcol~=vcol
    error('输入矩阵维数不相等！');
end
y=sum(sum(w.*v))./(sqrt(sum(sum(w.^2))).*sqrt(sum(sum(v.^2))));