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ÕâÊÇÒ»¸ö£¨3,4£©ÃÅÏÞµÄÀ¸ñÀÊÈÕ²îÖµ·½·¨µÄÃØÃÜͼÏñ·Ö´æÓë»Ö¸´µÄ³ÌÐò£¬ÔõôÄܸijɣ¨2,4£©ÃÅÏÞµÄÄØ£¿ clear all: close all; M=imread('0.jpg'); ss=rgb2gray(M); figure; imshow(ss); %Éú³É×ÓͼÏñ [m n]=size(ss); for i=1:m*n if ss(i)>250 ss(i)=250; end end s=double(ss)+1; x=[1 2 3 4]; g1=zeros(m,n); g2=zeros(m,n); g3=zeros(m,n); g4=zeros(m,n); yy1=zeros(m,n); yy2=zeros(m,n); yy3=zeros(m,n); yy4=zeros(m,n); y1=zeros(m,n); y2=zeros(m,n); y3=zeros(m,n); y4=zeros(m,n); for j=1:m*n a1=mod(2*j,251); a2=mod(3*j,251); f=[a1 a2 s(j)]; g1(j)=polyval(f,x(1)); yy1(j)=mod(g1(j),251); g2(j)=polyval(f,x(2)); yy2(j)=mod(g2(j),251); g3(j)=polyval(f,x(3)); yy3(j)=mod(g3(j),251); g4(j)=polyval(f,x(4)); yy4(j)=mod(g4(j),251); end y1=uint8(yy1-1); y2=uint8(yy2-1); y3=uint8(yy3-1); y4=uint8(yy4-1); figure,imshow(y1); figure,imshow(y2); figure,imshow(y3); figure,imshow(y4); %»Ö¸´ l1=x(2)*x(3)/[(x(1)-x(2))*(x(1)-x(3))]; l2=x(1)*x(3)/[(x(2)-x(1))*(x(2)-x(3))]; l3=x(1)*x(2)/[(x(3)-x(1))*(x(3)-x(2))]; rr1=zeros(m,n); r=zeros(m,n); for j=1:m*n rr1(j)=mod(yy1(j)*l1+yy2(j)*l2+yy3(j)*l3,251); end r=uint8(rr1-1); figure,imshow(r); |
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