摘要
基于视频码流内嵌入数字水印典型系统H&G算法的基础,提出了在MPEG-4码流中嵌入数字水印的一种新算法。该算法在MPEG-4视频流中,根据局部图像特性调整水印嵌入的局部强度以达到水印鲁棒性的最大化和视频质量影响的最小化;同时构造了具有纠错功能的水印信息并且在水印信息提取过程中采用了信号合并技术得到了较高的正确率。计算机试验表明此算法与嵌入水印前的原视频图像相比,嵌入水印后的视频图像信噪比损失很小.并证明信号合并技术具有很好的提取水印能力。
Based on characteristics of MPEG-4 video system,the H＆G algorithm is discussed in this paper,which is typical video watermarking algorithm in the compressed video.A gain control algorithm adjusts the local strength of watermark depending on local image characteristics,in order to maximize watermark robustness and to minimize the impact on the quality.In addition,the algorithm has characteristics of error-correct and detection watermarking using the signal combing strategies.Simulation results show that it is effective to extract watermarking by using the signal combining strategies.
出处
《计算机工程与应用》
CSCD
北大核心
2005年第30期55-56,59,共3页
Computer Engineering and Applications
关键词
数字水印
视频压缩
视频码流
digital watermarking, video coding, compressed stream
