Implementation efficient digital picture-in-picture decoding met

Details Implementation efficient digital picture-in-picture decoding met Implementation efficient digital picture-in-picture decoding met

1995-06-06

1998-10-27

Casler, Brian

Television

Basic receiver with additional function

For display of additional information

348567, 348568, H04N 5445

Patent

active

058284214

ABSTRACT:
An implementation efficient video decoder suitable for use as a picture in picture decoder is described. In one embodiment, the video decoder receives primary and secondary bitstreams with the secondary bitstream including the video data intended to be displayed as inset pictures. The decoder uses many of the same circuit components on a time shared basis to decode both the main and inset pictures reducing the amount of circuitry required to implement the decoder. In one embodiment a preparser discards the majority of DCT coefficients in the secondary bitstream and the remaining data is variable length decoded and then variable length encoded using a non-MPEG compliant coding scheme prior to storing the inset picture data in a coded data buffer. Re-encoding of the selected inset picture data in this manner greatly reduces data storage requirements and simplifies the circuitry required to subsequently decode the inset picture data. To reduce frame memory requirements inset picture data is downsampled, stored and then upsampled prior to display thereby reducing inset picture frame memory buffer requirements.

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A. Hoffman, B. Macq, J.J. Quisquater; New Technologies and New Services, Future Prospects of the Cable TV Neetworks, pp. 17-20 (date unknown).

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