| 摘要 |
An analog video tagging and encoding system. The invention inserts an analog tag frame into the analog video stream such that the luminance values are made to approach zero, i.e., black, allowing a potential tag frame to be quickly identified. Tag information is then encoded as a structured color pattern into the chrominance portions of the frame and contains program start/stop information, program segment identification, or data downloads. The color pattern is chosen such that when it is converted into digital form according to the Moving Picture Experts Group (MPEG) standard, the digital signal so produced may be easily and minimally parsed to recognize the presence or absence of a tag within a normal frame time period.
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