A gray level digital watermarking algorithm based on the DCT transform
Chunjie Li · Journal of Bohai University · 2010
In response to the weak embedding quality and stability of gray level digital image watermarking which is embeded with too much information,the authors put forward a new digital watermarking algorithm for imbedding gray level digital watermarking.information of the gray digital watermarking is converted into binary matrix,the matrix containing 0,1,2 and 3 is converted in accordance with each combination of the two numbers.With two independent pseudo—random sequence substitute the '0','1'and '2','3' respectively,finally,combins into two new pesudo—random sequence.In the process of embedding,the modulated signal is embedded in the middle frequency band of carrier image with ascending order according to variance.The experiments show the proposed algorithm is effective and robust to many common image processing operations,especially to cutiing,noise,median filters and JPEG compression.