| 摘要 |
<p>The invention concerns a method and system for identifying commercial message segments of a video signal. A set of rules is applied for determining the occurrence of commercial messages with a higher degree of accuracy as compared to conventional methods. In general, method includes the steps of monitoring a digital bit stream (402) comprising the video signal, detecting a change in a control field (404) of the digital bit stream, and then selectively generating a commercial event notification (410) responsive to the detecting step. According to one aspect of the invention, a change in at least one of a video sequence header and a sequence display extension can be detected. Alternatively, or in addition to checking for a change in control field, the method can comprise the step of detecting a change in an informational parameter (408) of the video signal exclusive of the audio-visual content.</p> |
