摘要
本文提出了一种数字电视条件接收的版权保护方案,该方案将数字电视条件接收(CA)系统中的个人分发密钥(PDK)作为惟一标志用户身份的信息,在用户接收端通过智能卡提取出PDK,经过扩频调制后生成数字水印,嵌入到数字电视I帧亮度信号的离散余弦变换(DCT)量化系数矩阵的中频系数中。当发现非法拷贝时,对提取出的数字水印做扩频解码即可获得嵌入的PDK信息,然后根据这个PDK可以知道非法用户的身份。
Analysing an application scheme of video watermark in DTV area, this article gives a video watermark algorithm which is based on DTV conditional access right protect. The simulation experiment has proved this algorithm has good protect performance against noise attack, filtering operation and frame skipping attack, especially against Gaussian noise. This scheme is an effective solution on DTV program right protection.
出处
《广播与电视技术》
北大核心
2008年第2期104-106,15,共3页
Radio & TV Broadcast Engineering
