Patent ID: 6859545

Claim:
An information hiding method with reduced fuzziness, which comprises the steps of: inputting the information to be embedded into a convolutional encoder and generating encoded information whose length is a multiple of the original information; generating a random number sequence using interleaving encoding for permuting the encoded information, the seed of the random numbers being a first key; selecting a pixel of a host image using a random number generator as an information embedding point of the encoded information, the seed of the random number generator being a second key, and embedding the encoded information into a B channel of the pixel of the host image; further wherein the host image H is an image of m×n pixels and the electronic signature to be embedded is information W with a size L, both the host image H and the embedded information W being expressed as: H={h ij |0≦i<m,0≦j<n, h ij ε [0,255]}, and W={w i |0≦L, w i ε [0,1]}; and a set ASET ij ={h i+lj , h i−lj+1 , h ij+1 , h i+lj+1 } being defined for four pixels surrounding and to the right of any pixel h ij in the host image.