System and method for enhancing videos from drift-free...

Details System and method for enhancing videos from drift-free... System and method for enhancing videos from drift-free...

2005-07-12

2005-07-12

Johns, Andrew W. (Department: 2621)

Image analysis

Image compression or coding

Interframe coding

C382S240000

Reexamination Certificate

active

06917713

ABSTRACT:
A scalable decoder system having a decoder reconstruction system, wherein the decoder reconstruction system comprises: an estimation algorithmx~i,ne=ai,n+EZ⁢{di,n⁡(ρ;x~i,n-1e+Z)}for estimating a lost discrete cosine transform (DCT) coefficient, which incorporates the quantization noise of previous enhancement layer data into the expectation, 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)}laccording to the equation:α^l=-log⁡(1-P^l)bl,wherein bldenotes each of a set of quantizer decision levels l, and {circumflex over (P)}lis 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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Zhang, R. et al., “Optimal Estimation for Error Concealment in Scalable Video Coding,” Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers, 2000, vol. 2, 2000.

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