Image analysis – Image compression or coding – Quantization
Patent
1999-10-04
2000-12-26
Au, Amelia
Image analysis
Image compression or coding
Quantization
348405, G06K 936
Patent
active
061671622
ABSTRACT:
A new method for real time implementation of rate-distortion optimized coding mode selection is disclosed that can be efficiently applied to H-263-compatible video codecs and other codecs of similar type. A normalized rate-distortion model is used to efficiently compute the rate and the distortion when encoding motion-compensated prediction error signals, instead of performing DCT, quantization and entropy-encoding. A fast algorithm is also disclosed that determines sub-optimal values of coding parameters such as the quantization parameter and the Lagrangian multiplier, .lambda., for the trellis search. Very good rate control and picture quality are achieved, especially when the disclosed techniques are applied in very low bitrate video coding.
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Lei et al. "Rate Control in DCT Video Coding for Low-Delay Communications" IEEE Transaction on Circuits and Systems for Video Tech, vol. 9, No. 1 pp. 172-185, Feb. 1999.
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Wiegand, T., M. Lightstone, D. Mukherjee, T.G. Campbell and S.K. Mitra, "Rate-Distortion Optimized Mode Selection for Very Low Bit Rate Video Coding and the Emergin H.263 Standard," IEEE Trans. Circuits and Systems for Video Technology, vol. 6, No. 2, Apr., 1996.
Jacquin Arnaud Eric
Yang Kyeong Ho
Au Amelia
Lucent Technologies - Inc.
Ryan William
Wu Jingge
LandOfFree
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