发明名称 |
DIGITAL VIDEO PROTECTION FOR AUTHENTICITY VERIFICATION |
摘要 |
A method and apparatus for verifying the authenticity and integrity of an ordered sequence of digital video frames, without having access to the original recording, by embedding therein a respective series of digital signatures based on a secret key, or keys, and on the video content of respective frames. Signatures are camouflaged by embedding in transform coefficients of a transformed representation of the video data in parts of the frame corresponding to motion. If there is sufficient motion to contain all of the signature bits, a supplementary technique embeds in high-texture areas of a frame. A final fall-back is to embed in a pre-defined default zone. A method of predicting when supplementary embedding is needed enables the process to be applied in a single pass allowing real-time operation. Verification is done during decoding by comparing, for identiy, embedded signatures with signatures calculated anew using the method employed to embed. |
申请公布号 |
WO02084990(A2) |
申请公布日期 |
2002.10.24 |
申请号 |
WO2002IL00291 |
申请日期 |
2002.04.11 |
申请人 |
NICE SYSTEMS LTD.;KEIDAR, OREN;BAR-SELLA, RAN;DVIR, IGAL |
发明人 |
KEIDAR, OREN;BAR-SELLA, RAN;DVIR, IGAL |
分类号 |
H04N5/913;H04N7/26;H04N9/804 |
主分类号 |
H04N5/913 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|