Watermark Algorithm Research and Simulation Based on Different Frequency Coefficients

摘要

The digital watermarking technology fundamentally said that, belongs to the information hiding technology. Watermark algorithm proposed which in view of previous people and Inoue insufficient, proposed one kind is new based on the wavelet low frequency coefficient and the discrete cosine transformation (DCT) the territory intermediate frequency coefficient digital image watermarking algorithm. To this algorithm, (DCT) the territory intermediate frequency coefficient position replacement public watermark algorithm and proposed based on the discrete cosine transformation (DWT) the territory quantification public watermark algorithm has carried on the simulation analysis based on the separate wavelet transformation, finally indicated. After this algorithm although inserts the watermark the image quality to have the drop, has the good visual effect and robustness, can resist very many types the attack.