基于图像特征区域的加密全息水印算法

Encrypted Holographic Watermark Algorithm Based on Image Feature Area

针对图像的特征区域,提出了一种变换域的加密全息水印算法。根据K-均值聚类思想,将图像分为前、后景区特征区域,用双随机相位调制为全息水印加密,提高水印的安全性;通过DCT变换,在变换域中将加密的全息水印嵌入中频系数,兼顾了人眼的视觉特性和水印的鲁棒性,且属于盲水印算法。实验结果表明,该水印算法能够抵抗常见的各种攻击,重建水印清晰、有效,水印具有极强的隐蔽性、鲁棒性和安全性。

A new encrypted holographic watermark algorithm based on image feature area in transform domain was proposed. The host image was separated into foreground and background areas based on K-means clustering, and the safety of watermark was improved by using double random phase encryption. Through DCT, the encrypted holographic watermark was embedded into middle frequency coefficients, which both suits the HVS and robustness, and it is a blind watermark algorithm. Results showed that this algorithm can resist all kinds of attacks; the reconstructed water- mark is clear. It was concluded that the watermark has strong invisibility, robustness and safety.