基于LWT-PCA算法的水印技术在视觉密码中的应用

Application of watermarking technology based on LWT-PCA algorithm in visual cryptography

本文提出了一种基于LWT-PCA的数字水印算法在像素不扩展(2,2)视觉密码方案中的应用。算法对载体图像进行一阶提升小波变换,在低频LL子带上用主成分分析提取出重要的主成分系数,再用像素不扩展(2,2)视觉密码方案将水印拆分成2个分享图像,将其中分享图像1嵌入到提取的主成分系数中,提取出来分享图像1与分享图像2可以恢复出水印。实验结果表明,本文水印算法能抵抗各类常见的攻击,同时保证了水印的隐蔽性。

This paper proposes the application of a digital watermarking algorithm based on LWT-PCA in the pixel non-expansion(2,2)visual cipher scheme.The algorithm performs a first-order boosted wavelet transform on the carrier image,extracts the important principal component coefficients on the low-frequency LL sub-band by Principal Component Analysis,and then splits the watermark into two shared images by using the pixel non-expansion(2,2)visual password scheme.After that,the paper embeds the shared image 1 into the extracted principal component coefficients,and extracts the shared image 1 and the shared image 2 to recover the watermark.Experimental results show that the proposed watermarking algorithm can resist various common attacks and ensure the concealment of watermarks.