invmoments.m

来自「《Visual C++数字图像识别技术典型案例》之光学字符识别技术源码」· M 代码 · 共 35 行

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 %%       Prof. Sclaroff's CS585 Image avd Video Processing       %%
%%                         Project  ONE                            %%
%%           C H A R A C T E R   R E C O G N I T I O N             %%
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%%                    by Stanislav Rost                    %%
 %%                       ID:  31764117                           %%
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function mvec = invmoments(matrix)
%  INVMOMENTS.M
%
%  function [ m1, m2, m3 ] = invmoments(matrix)
%  
%  Returns 2 invariant moments for matrix "matrix"
%

[ h w ] = size(matrix);

nc20 = ncmoment(2,0,matrix,w,h);
nc02 = ncmoment(0,2,matrix,w,h);
nc30 = ncmoment(3,0,matrix,w,h);
nc03 = ncmoment(0,3,matrix,w,h);
nc12 = ncmoment(1,2,matrix,w,h);
nc21 = ncmoment(2,1,matrix,w,h);
nc11 = ncmoment(1,1,matrix,w,h);

mvec(1) = nc20 + nc02;
mvec(2) = (nc20 - nc02)^2 + 4*nc11^2;
mvec(3) = ( nc30 - 3 * nc12 ) ^2 + (3 * nc21 - nc03 ) ^2;