系统不仅能够实现较高比例的数据压缩，而且还原图像的失真较小，具有较高的实用价值。
The system will not only be able to achieve a higher proportion of data compression, smaller image distortion, it has high practical value.
给出了一种基于DCT变换的数字水印策略，它有以下特点：（1）隐藏效果好，视觉系统无法看出与原图像的区别；
A new watermark scheme based on DCT is presented in this paper, which has following features:(1)the difference between the watermarked image and the original is perceptually invisible;
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