基于3G视频的水印方法  

Watermarking algorithm based on 3G video

作　　者：周治平[1] 张彩虹[1] 

机构地区：[1]江南大学通信与控制工程学院,江苏无锡214122

出　　处：《计算机工程与设计》2011年第4期1272-1275,1287,共5页Computer Engineering and Design

摘　　要：针对3G视频编码标准的特性视频流水印技术的实时性问题,提出了一种基于色度块DC系数的视频流水印的鲁棒性算法。该方法利用Arnold变换对水印图像进行预处理,通过计算视频序列I帧的亮度确定欲嵌入帧,计算色度块的均值和方差,把置乱后的水印信息嵌入到色度块的量化DC系数中,该水印算法具有盲检测性。实验结果表明,该算法具有很好的不可见性,并且实现简单,可满足实时性要求,经过压缩等视频处理后,提取水印的NC值都在0.85以上,具有很好的鲁棒性,在嵌入位置的选择性给攻击者在确定攻击目标上增加了一定的难度,具有较好的安全性。Aiming at the problems of the features of 3G video coding standard and real-time,a robustness video watermark algorithm based on DC coefficients of chroma block is presented.The two-dimensional Arnold image scrambling is designed firstly,according to calculating the brightness of the I frame video sequence to determine the embedded frame,then calculating the average value and variance of chroma block,embedded the scrambled watermark information into the quantized DC coefficients of chroma block,this algorithm has blind detection.The experimental results show that this algorithm has a very good invisibility as well as easy realized which meet real-time.After shearing and some other video processing,the NC level is over 0.85 with good robustness.Meanwhile,the selectivity of embedded position makes it harder for attacker to sense attack target,so it makes better safety.

关 键 词：视频流水印 直流系数 实时性 视频编码 鲁棒性 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]