Author Archives: mikiyas

to Edit TPVD(Tri – Pixel value difference) image steganography from 2×2 to 3×3 matrix

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i want to modify TPVD matrix from 2×2 to 3×3 but how i can change ??? matrix g

g=a(1+x:2+x,1+y:2+y);

g=double(g);
d0=g(1,2)-g(1,1);
d1=g(2,1)-g(1,1);
d2=g(2,2)-g(1,1);
lk=[0 8 16 32 64 128];
uk=[7 15 31 63 127 255 ];

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