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Methods and systems for conditional transform-domain residual accumulation

  • US 8,130,822 B2
  • Filed: 03/31/2007
  • Issued: 03/06/2012
  • Est. Priority Date: 07/10/2006
  • Status: Expired due to Fees
First Claim
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1. A method for combining layers in a multi-layer bitstream, said method comprising:

  • a) determining a first spatial resolution of a first layer of a multi-layer image;

    b) determining a second spatial resolution of a second layer of said multi-layer image;

    c) comparing said first spatial resolution with said second spatial resolution;

    d) performing steps e) through f), and not performing steps h) through k), when said first spatial resolution is substantially equal to said second spatial resolution;

    e) scaling a first-layer transform coefficient to match a characteristic of a second-layer thereby creating a scaled, first-layer transform coefficient;

    f) combining said scaled, first-layer transform coefficient with a second-layer transform coefficient to form a combined coefficient;

    g) performing steps h) through k), and not performing steps e) through f) when said first-layer spatial resolution is not substantially equal to said second-layer spatial resolution;

    h) inverse transforming said first-layer transform coefficient thereby producing a first-layer spatial domain value;

    i) inverse transforming said second-layer transform coefficient thereby producing a second-layer spatial domain value;

    j) scaling said first-layer spatial domain value to match the resolution of said second layer thereby producing a scaled, first-layer spatial domain value; and

    k) combining said scaled, first-layer spatial domain value with said second-layer spatial domain value thereby producing a combined spatial domain residual value.

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