一种结合细胞自动机的彩色图像数字水印算法的研究

A Research of Digital Watermarking Algorithm about Color Images Combining the Cellular Automata

本文给出了一种结合细胞自动机的小波域彩色图像数字水印算法。该算法运用Logistic方程作为混沌模型产生随机矩阵,然后利用细胞自动机进行处理以形成水印。对原始图像进行了高尺度的DWT分解,选取高频系数作为水印信息嵌入的载体,然后根据加性规则嵌入水印。算法设计中对各参数选择了较合适的值,以避免取值不当对水印性能造成影响。该算法充分利用了小波和细胞自动机的优良特性,使水印系统具有很好地性能。针对这一算法,文章从图像感知质量和鲁棒性两个方面进行了评价,经大量攻击测试和实验数据表明该算法在不严重影响待检测图像质量的前提下,具有较强的鲁棒性。

The paper presents an algorithm for wavelet domain digital watermarking in colored image, which combined with cell automata. The algorithm uses the Logistic equation as chaotic model to generate random matrix, and then is processed by cellular automata to form the watermark. The original image is decomposed with high scale of the DWT decomposition, select the high frequency coefficient as the carrier of the watermark information, then embedded watermark information according to the rules of addition rule. Select the appropriate parameter values in the design of the algorithm to avoid the influence of watermark performance. The algorithm makes full use of the excellent properties of the wavelet and cellular automata, which makes good performance for watermarking system. According to this algorithm, the paper evaluated the perceptual quality and robustness of the image from two aspects. The attack test and experimental data show that the algorithm has strong robustness without serious effect to the image quality.