小波域无失真扩频鲁棒水印设计

An Undistorted Spread Spectrum Robust Watermarking Design in DWT

本文提出了一种无失真扩频鲁棒水印方案,该方案通过量化函数对受版权保护的图像的小波域进行量化,用所产生的二值序列直接作为水印,即特征水印。由于该方案是基于图像内容的,并没有向图像中嵌入任何信息,并不需要真正执行IDWT,水印图像没有任何失真,因而本文的扩频水印方案是无失真"水印嵌入"方案。水印的鲁棒性主要由量化参数决定,而不是像传统的水印方案那样一般由嵌入的水印信息量所决定。

This paper proposes an undistorted spread spectrum robust watermarking scheme. In this scheme, a method of feature watermarking is proposed, which is a binary sequence, and is the result of quantifying the coefficients in DWT by the quantization function. Since the scheme is content-based, and we do not embed any information into the watermarked image, the IDWT is so not necessary, and then the scheme is undistorted. The performance of the scheme is determined mainly by the quantization coefficient, rather than the amount of information embedded in the traditional watermarking schemes.