摘要： 提出了一种基于DCT的鲁棒公开水印算法，算法利用JPEG压缩量化阶段的舍入误差，结合二值逻辑进行水印嵌入。实验结果表明，该算法是有效的，在保证水印高不可见性的同时，对常见的图像处理操作和剪切、旋转、缩放等几何变换有较高的鲁棒性，特别是能抵抗压缩比高达43:1的JPEG压缩。

关键词: 数字水印技术, DCT, JPEG压缩, 多媒体信息, 鲁棒性

Abstract: In this paper, a robust public watermark algorithm in DCT domain is presented. The algorithm takes advantage of the round-off errors during the quantization step of JPEG compression and binary logic to embed the watermark. The experimental results show that the algorithm is very efficient. The embedded watermark with the algorithm is invisible, at the same time, the watermark algorithm is robust to common image processing operations and slight geometric distortions, such as cropping, rotation and scaling. Especially it can resist JPEG compression whose compression ratio amounts to 43:1.

中图分类号: 

• TP309.2