.设计对水印系统进行公正的比较和评价方法。在这方面己经有部分学者作了一些初步的研究，但缺乏普遍性和原理性，对水印系统的脆弱之处仍无法进行全面的测试与衡量。-. Watermark system designed just for comparison and evaluation. In this regard, some scholars have been some preliminary research, but the lack of universality and the principle of the fragile watermarking system of the Agency remained unable to conduct a comprehensive test and measurement.