基于Q-DCT域实时视频水印的版权保护方案  

A Real-time Video Watermarking Algorithm for Copyright Protection In Q-DCT Domain

作　　者：瞿伟[1] 蒋兴浩[1] 孙锬锋[1] 

机构地区：[1]上海交通大学信息安全工程学院,上海200240

出　　处：《信息安全与通信保密》2010年第2期70-72,共3页Information Security and Communications Privacy

基　　金：国家863计划资助项目(编号:2009AA01Z407)

摘　　要：提出一种在Q-DCT域的实时视频水印的版权保护方案。Q-DCT域水印是指对MPEG量化后的DCT数据做水印嵌入。针对Q-DCT矩阵的特点,引入AC次低频系数稀疏度和量化后能量的概念。根据稀疏度自适应地调整亮度宏块内能量最高的DCT块的次低频系数,实现水印嵌入。实验证明该水印方案能够实现水印的实时盲检测,算法具有较低的计算复杂性,较好的安全性,并且水印嵌入后对视频文件大小影响可忽略不计。This paper proposes a real-time video watermarking algorithm in Q-DCT domain. Q-DCT domain means quantized DCT coefficient domain. This paper presents the sparsity of matrix and quantized energy of AC sub-low frequency coefficients. The algorithm embeds the watermark into the maximum quantized energy DCT block by modulating the AC sub-low frequency coefficients adaptively based on sparsity. Experiments show that this watermarking scheme is transparent and realizes, real-time and blind detection, the algorithm has a lower computational complexity, and the impact on video size could be negligible.

关 键 词：Q—DCT域 版权保护 稀疏度 实时 盲检测 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]