Television – Bandwidth reduction system – Data rate reduction
Patent
1996-04-24
1997-11-25
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348419, H04N 732, H04N 730
Patent
active
056917708
ABSTRACT:
The picture quality of an MPEG-coded video signal can be improved considerably by modifying selected coefficients after conventional quantization, for example by rendering them zero. The modification is such that the Lagrangian cost D+.lambda.R (D is distortion, R is bitrate) is minimal for a given value of a Lagrange multiplier .lambda.. A relatively simple process is disclosed in which the value of .lambda. is calculated by means of statistical analysis (6) of the picture to be coded. The statistical analysis comprises the estimation of the RD curve on the basis of the amplitude distribution of the coefficients. The searched .lambda. is the derivative of this curve at the desired bitrate.
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Uz et al, "Optimal Bit Allocation in the Presence of Quantizer Feedback", IEEE, pp. V-385-V-388, Apr. 1993.
Schuster et al, "Fast and Efficient Mode and Quantizer Selection in the Rate Distortion Sense for H.263", Proc. of SPIE, vol. 2727, No. 2, pp. 784-795, Mar. 1996.
Zabele, G. Stephen, "Fourier of Closed Planar Boundaries", IEEE Trans. on Pattern Anal. Machine Intelligence, vol. PAMI-7, No. 1, pp. 98-102, Jan. 1985.
"Ramchandran et al, Rate-Distortion Optimal Fast Thresholding with Complete JPEG/MPEG Decoder Compatibility" IEEE Transactions on Image Processing, vol. 3, No. 5, Sep. 1994.
MPEG2 Test Model 5, Apr. 1993, p. 57.
Coene Willem M. J.
Keesman Gerrit J.
Salomons Eduard W.
Chin Tommy P.
Gathman Laurie E.
Le Vu
U.S. Philips Corporation
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