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Efficient coding scheme for multilevel video transmission

  • US 5,253,058 A
  • Filed: 04/01/1992
  • Issued: 10/12/1993
  • Est. Priority Date: 04/01/1992
  • Status: Expired due to Term
First Claim
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1. A signal coder for coding an input video signal into a basic layer signal and at least one contribution layer signal, a video signal having a spatial resolution lower than the spatial resolution of the input video signal being reconstructible from the basic layer signal, and a video signal having a spatial resolution higher than the lower spatial resolution and up to the resolution of the input video signal being reconstructible from the combination of the basic layer signal and the at least one contribution layer signal, the signal coder comprising:

  • means for receiving an input signal consisting of pel values of a scanned video signal, said video signal consisting of sequential video frames,means for filtering the video signal to produce a baseband sequence of filtered pel values for each video frame,interframe hybrid transform/differential pulse code modulation coding means for coding the baseband sequence of filtered pel values for each video frame to form the basic layer signal,means for forming a differential video signal of each frame from the difference between the pel values in a current video frame and predicted pel values derived from the pel values in a previous coded video frame,means for decomposing the differential video signal of each frame into plural subband sequences of filtered differential pel values,means for separately quantizing and entropy coding the plural subband sequences of filtered differential pel values, andmeans for combining at least some of the quantized and encoded subband sequences of filtered differential pel values to form the at least one contribution layer signal.

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