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System and method for enhancing videos from drift-free scalable bitstream

  • US 20030223642A1
  • Filed: 05/29/2002
  • Published: 12/04/2003
  • Est. Priority Date: 05/29/2002
  • Status: Active Grant
First Claim
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1. A scalable decoder system having a decoder reconstruction system, wherein the decoder reconstruction system comprises:

  • an estimation algorithm for estimating a lost discrete cosine transform (DCT) coefficient, wherein the estimation algorithm includes a density distribution dependent on at least one unknown parameter {circumflex over (α

    )}l; and

    a parameter estimation algorithm for estimating {circumflex over (α

    )}l according to the equation;

    α

    ^
    l
    =-log

    (1-P^l)
    bl
    ,
    wherein bl denotes each of a set of quantizer decision levels l, and {circumflex over (P)}l is the sum of a set of a normalized frequency of occurrences of data quantized to each quantizer decision level 1,2, . . . , l.

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