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MPEG-4 Rate Control Method with Spatio-Temporal Trade-Offs  

Lee Jeong-Woo (Information Technology Laboratory, LG Electronics Institute of Technology)
Ho Yo-Sung (Department of Information and Communications, Kwangju Institute of Science and Technology)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.41, no.1, 2004 , pp. 47-56 More about this Journal
Abstract
This paper describes a new bit allocation algorithm that can achieve a constant bit rate when coding multiple video objects, while improving rate-distortion (R-D) performance over the VM5 method for MPEG-4 object-based video coding. In particular, we propose two models to estimate the rate-distortion characteristics of coded objects as well as skipped objects. Based on the proposed models, we present several R-D coding modes with spatio-temporal trade-offs to improve coding efficiency. The proposed algorithm is performed at the object level for object-based video coding. Simulation results demonstrate moderate improvement at low as well as high bit rates. The proposed algorithm can produce the actual coded bits very close to the target bits over a wide range of bit rates. Consequently, the proposed algerian has not experienced any buffer overflow or underflow over the bit rates between 32 kbps and 256 kbps.
Keywords
MPEG-4; Rate Control; Tate-Distortion; Object-based Coding;
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