9794201mang-watermarking.rar_medicinets2_一致性算法_一致性验证_算法一致性_鲁棒性

function S=adwa(s,w) si1=size(s); x=si1(1); y=si1(2); s1=double(s); s1=DCT2(s); wm=mark(w); m=length(wm); m1=fix(m/3); m2=m-m1; x1=fix(x/2); y1=fix(y/2); col1=m1/x1; if fix(col1)==col1 xx1=x1; lco1=0; else col1=fix(col1)+1; xx1=fix(m1/col1); lco1=rem(m1,col1); end st1=fix((y-y1)/col1); max1=y1+st1*col1; j=1; for i=1:xx1 for k=y1+1:st1:max1 av=0; for k1=k+1:k+st1-1 av=av+s1(i,k1); end av=av/(st1-1); if wm(j)==1&s1(i,k)<av+25 s1(i,k)=av+25; else if wm(j)==0&s1(i,k)>=av-25 s1(i,k)=av-25; end end j=j+1; end end if lco1~=0 max11=y1+st1*lco1; i=xx1+1; for k=y1+1:st1:max11 av=0; for k1=k+1:k+st1-1 av=av+s1(i,k1); end av=av/(st1-1); if wm(j)==1&s1(i,k)<av+25 s1(i,k)=av+25; else if wm(j)==0&s1(i,k)>=av-25 s1(i,k)=av-25; end end j=j+1; end end x2=x1+1; col2=m2/(x-x1); if fix(col2)==col2 xx2=x-x1; lco2=0; else col2=fix(col2)+1; xx2=fix(m2/col2); lco2=rem(m2,col2); end st2=fix(y/col2); max2=st2*col2; for i=x2:xx2+x1 for k=1:st2:max2 av=0; for k1=k+1:k+st2-1 av=av+s1(i,k1); end av=av/(st2-1); if wm(j)==1&s1(i,k)<av+25 s1(i,k)=av+25; else if wm(j)==0&s1(i,k)>=av-25 s1(i,k)=av-25; end end j=j+1; end end if lco2~=0 max12=st2*lco2; i=xx2+1+x1; for k=1:st2:max12 av=0; for k1=k+1:k+st2-1 av=av+s1(i,k1); end av=av/(st2-1); if wm(j)==1&s1(i,k)<av+25 s1(i,k)=av+25; else if wm(j)==0&s1(i,k)>=av-25 s1(i,k)=av-25; end end j=j+1; end end s1=IDCT2(s1); S=uint8(s1);