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Fixed quality source coder with fixed threshold

  • US 5,541,594 A
  • Filed: 07/13/1994
  • Issued: 07/30/1996
  • Est. Priority Date: 03/28/1994
  • Status: Expired due to Term
First Claim
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1. A fixed quality source coder for encoding a digital signal ID which comprises a first series of separate data respectively representing multiple pixels, the coder comprising:

  • codec means receiving the signal ID for encoding the signal ID to provide encoded information regarding the signal ID and for decoding the encoded signal to produce a decoded signal IVQ-1 which comprises a second series of separate data respectively representing the multiple pixels;

    means for determining an error signal ER which comprises a third series of separate data that is the result of a comparison of the first series of separate data and the second series of separate data for each of the multiple pixels;

    threshold means receiving the signal ER for passing a truncated error signal ET for each of the multiple pixels based on a comparison of ER and fixed threshold value T; and

    lossless encoder means for receiving and encoding the signal ET to provide a signal ET.

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