关键词: 数字水印, 安全性, 元胞自动机, 元胞自动机变换

Abstract:

This paper proposes a multiple watermarking algorithm, which can enhance watermark security by utilizing the abundance and complexity of the nature of cellular automata and cellular automata transforms. The image is divided into non-overlapped blocks. A chaotic sequence number list decides which watermark will be embedded into a block. We encrypt the watermark and perform 2-D cellular automata transform on block with the private key, and embed the encrypted watermark into the low frequency coefficients of the block. Experimental results indicate that the proposed method is secure, robust and invisible, and that the embedding and extracting of watermarks do not interfere with each other.

Key words: digital watermarking, security, cellular automata, cellular automata transforms