水印系统必然要在算法的鲁棒性、水印的嵌入信息量以及水印嵌入之后的不可觉察性之间达到一个平衡。这涉及鲁棒性算法的原理性设计、水印的构造模型、水印能量和容量的理论估计、-Watermarking system must be robust in the algorithm, the embedded watermark information, as well as after the watermark embedding is not aware of to achieve a balance between. This involves the principle of robustness of algorithm design, the structural model of the watermark, the watermark of the theory of energy and capacity is estimated that