SYSTEM AND METHOD FOR ENHANCING VIDEOS FROM DRIFT-FREE SCALABLE BITSTREAM

摘要

A scalable decoder system having a decoder reconstruction system, wherein the decoder reconstruction system comprises: an estimation algorithm ${\tilde{x}}_{i,n}^e=a_{i,n}+E_Z\⁢\left\{d_{i,n}\⁡\left(\mathrm{\ρ};{\tilde{x}}_{i,n-1}^e+Z\right)\right\}$;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 ()}_l; and a parameter estimation algorithm for estimating {circumflex over ()}_l according to the equation: ${\widehat{\mathrm{\α}}}_l=-\frac{\log \⁡\left(1-{\hat{P}}_l\right)}{b_l},$;wherein b_l 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.