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Video coding and decoding apparatus including corresponding nonlinear compression and expansion of a motion compensation error signal

  • US 5,734,431 A
  • Filed: 04/19/1996
  • Issued: 03/31/1998
  • Est. Priority Date: 04/20/1995
  • Status: Expired due to Fees
First Claim
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1. A video coding apparatus comprising:

  • a source of a local-decoded picture signal corresponding to a previous picture signal of a video signal received by the video coding apparatus for processing;

    a motion compensation unit having one input receiving the video signal and another input receiving the local-decoded picture signal from said source and generating a motion compensation picture signal responsive to each of the input signals;

    a nonlinear processing unit having one input receiving the video signal and another input receiving the motion compensation picture signal and taking the difference between the received video signal and the received motion compensation picture signal to form a motion compensation error signal and nonlinearly compressing the motion compensation error signal with a compression rate that increases as the difference between the video signal and the motion compensation picture signal increases and outputting a nonlinearly-compressed motion compensation error signal; and

    a coding unit connected to receive the further processed nonlinearly-compressed motion compensation error signal output from said nonlinear processing unit and coding the received signal representing compressed motion compensation error.

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