一类有效的脆弱型数字水印技术

数字水印是多媒体数字产品版权保护和内容抗篡改的重要技术之一.本文在对以往脆弱型数字水印分析基础之上,给出了三种基于混沌系统的脆弱型数字水印技术,充分利用混沌系统对初值敏感和伪噪音等特性,使得相同子块在不同混沌状态下可能隐藏不同的水印信息,从而克服Holliman攻击和矢量拼贴攻击,有力的增强该脆弱型水印技术抵抗恶意攻击的能力.实验结果表明该算法在不破坏宿主图像视觉质量基础上,可精确地检测和定位对图像内容的局部恶意篡改,同时该算法很容易推广到其他数字媒体.

A New Kind of Efficient Fragile Watermarking Technique

Digital watermarking is a technique for inserting information (the watermark) into digital multimedia,which can be later extracted or detected for a variety of purposes including identification or authentication purposes.Based on analysis of the past fragile watermark techniques,three new efficient fragile watermark techniques are proposed,benefiting from the good properties of chaos,including the ease of their generation,their sensitive dependence on their initial condition and noise like,thus a same image sub block can embed different information at the same location and resist Holliman's attack.The scheme can detect any modification made to the image and indicate the specific locations that have been modified,because any modification would be reflected in a corresponding error in the extracted watermark.