System and method for enhancing videos from drift-free scalable bitstream
First Claim
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;
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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Abstract
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, 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)}l according to the equation:
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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Citations
9 Claims
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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;
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. - View Dependent Claims (2, 3, 4)
and wherein Z is a quantization noise, Ez is an expectation with respect to quantization noise, denotes a reconstruction offset, is an expectation of a DCT coefficient of a previous frame, ρ
equals a predetermined value between −
1 and 1, and ai,n is a beginning of a quantization interval.
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4. The scalable decoder of claim 3, wherein ρ
- equals approximately 1 for low frequency DCT coefficients, and less than 1 for high frequency DCT coefficients.
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5. A parameter estimation and optimal reconstruction (PEOR) method for use in a scalable decoder, the method comprising:
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determining the set of quantization occurrences;
estimating a parameter α
, wherein α
is estimated according to the equationwherein 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; generating a preliminary reconstruction point according to the equation and smoothing the preliminary reconstruction point to generate an optimal reconstruction point. - View Dependent Claims (6, 7)
wherein Z is a quantization noise, Ez is an expectation with respect to the quantization noise Z, denotes a reconstruction offset, is an expectation of a DCT coefficient of a previous frame, ρ
equals a predetermined value between −
1 and 1, and ai,n is a beginning of a quantization interval.
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8. A parameter estimation and optimal reconstruction (PEOR) system for use in a scalable decoder, comprising:
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a reconstruction system for determining an optimal reconstruction according to the equation;
wherein Z is a quantization noise, Ez is an expectation with respect to quantization noise Z, denotes a reconstruction offset, is an expectation of a discrete cosine transform (DCT) coefficient of a previous frame, ρ
equals a predetermined value between −
1 and 1, and ai,n is a beginning of a quantization interval.- View Dependent Claims (9)
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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Specification