Capacity estimation based watermarking algorithm

In order to be more robust and with higher fidelity, watermarking should be based on capacity estimation. Two capacity estimation based watermarking algorithms were proposed. Human visual system is used to determine the embedding strength for capacity estimation, showing that which DCT (discrete cosine transform) coefficient should be applied to embed information bit. The algorithms can achieve high robustness and low distortion and meet the requirement of dynamic adjustment of embedding capacity. It can be used for binary or image watermarking. A method combining watermarking and JPEG compression was also proposed.