摘要
提出了一种在隔行扫描MPEG-2视频流中嵌入DCT域水印的算法.该算法对MPEG-2中DCT变换按帧和按场进行的两种情况采用不同的扩频码进行嵌入和检测,使水印的检测基本不受DCT方式变化的影响,从而能够抵抗各种重编码攻击,同时也保持了良好的实时性.还采用了两步算法,即除水印数据外还同时嵌入了少量同步信息,这样既可定期更新用于水印数据的扩频码,从而提高算法的安全性与灵活性,同时在存在帧插入/删除等攻击时又不会因失去同步而导致检测失败.
A novel DCT-domain watermarking algorithm on interlaced MPEG-2 video streams is p different spreading codes for the frame- and field-based DCT types in MPEG-2, so that watermark detection is not disrupted when the DCT type changes, thus able to withstand all kinds of reencoding attacks. The algorithm also embeds some synchronization information in addition to the watermark data. This two-stage approach enables the spreading codes to be changed over time without losing synchronization in case of frame-insertion/deletion attacks, resulting in better security and versatility than conventional single-stage algorithms.
出处
《高技术通讯》
CAS
CSCD
北大核心
2005年第8期23-28,共6页
Chinese High Technology Letters
基金
国家高技术研究发展计划(863计划)，国家自然科学基金
