一种新的基于遗传算法DCT域半脆弱水印算法

DCT Semi-fragile Watermark Based on Genetic Algorithm

半脆弱水印因为在多媒体内容认证方面的重要作用而受到人们密切的关注。为了能够区分偶然攻击与恶意篡改,半脆弱水印需要对一般的内容保护图像操作有一定的鲁棒性。基于此,提出了遗传算法的半脆弱数字图像水印方法。根据图像局部区域的类型自适应地确定图像局部区域的水印嵌入强度,GA用来优化水印的嵌入位置。实验结果证实了所提的算法的优点,表明该方法具有较好的不可见性和鲁棒性,并实现了印刷图像载体版权保护。

Semi-fragile watermark has attracted attentiondue to its important role in content authentication for multimedia. In order to differentiate incidental attacks and malicious attacks, the semi-fragile watermark must be robust against content-protection image pro- cessing. This paper proposes a new semi-fragile digital image watermarking scheme based on genetic algorithm （GA）. In the scheme, the genetic algorithm used for optimizing embedding strength is employed to optimize the embedding location. Experimental results show that our scheme has both high fidelity and good robustness, which can realize digital copyright protection for printed image.