Object-based rate allocation with spatio-temporal trade-offs

Jeong Woo Lee, Anthony Vetro, Yao Wang, Yo Sung Ho

Research output: Contribution to journalArticlepeer-review


This paper describes a bit allocation algorithm that can achieve a constant bit rate when coding multiple video objects (MVOs), while improving the rate-distortion (R-D) performance over the reference method for MPEG-4 object-based rate control. In object-based coding, bit allocation is performed at the object level and temporal rates of different objects may vary. The proposed algorithm in this paper deals with these two issues. We pay particular attention to maintenance of buffer occupancy levels and propose a new method for spatio-temporal trades-offs for object-based coding. In order to improve the coding efficiency, we also consider several new R-D coding modes. These modes are available at the encoder to determine the best R-D performance under different coding conditions and are chosen automatically. Simulation results demonstrate moderate improvements at low and high bit rates. One important key aspect of the proposed algorithm is that the actual coded bits in the proposed algorithm are similar to the target bits over a wide range of bit rates. Consequently, the proposed algorithm has not experienced the buffer overflow/underflow over the entire range of bit rates.

Original languageEnglish (US)
Pages (from-to)374-384
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4671 I
StatePublished - 2002


  • MPEG-4
  • MVO Video Coding
  • Object-based Coding
  • Rate Allocation
  • Rate Control
  • Rate Distortion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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