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Abstract

A video data stream analyzer modifies an input digital video signal so that the resulting output digital signal can be optimally compressed by a digital video encoder. The video data stream analyzer eliminates redundancy in the input video signal, and reorganizes the input video signal so that the spatial and temporal redundancy is increased. In addition, the video data stream analyzer generates side channel information that is supplied to the video encoder. The side channel information tells the video encoder whether vertical frame-based filtering or vertical field-based filtering is preferable. Additional side channel information specifies the order and duration of the display of the fields after decoding and this information preferably is encoded with the video signal. The video data stream analyzer provides scan detection of the incoming video digital data, and automatically and reliably detects scene cuts, repeated fields, and mixed-field frames in the incoming digital video data in real time independent of the video source. The video data stream analyzer modifies the input video data stream by dropping repeated fields and replacing a frame with a scene cut with a frame having identical fields for video, cartoon, telecine video sources as well as arbitrary combinations of these video sources.

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First Claim