Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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MPEG-4 Rate Control Method with Spatio-Temporal Trade-Offs

시공간 화질의 절충을 고려한 MPEG-4 비트율 제어 알고리즘

  • 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)
  • 이정우 (LG전자기술원 정보기술연구소) ;
  • 호요성 (광주과학기술원 정보통신공학과)
  • Published : 2004.01.01
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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.

본 논문에서는 여러 개의 비디오 객체를 부호화할 때 기존의 MPEC-4 VM5알고리즘에 비해 부호화 성능을 향상시키면서 고정 비트율을 지원하는 새로운 알고리즘을 기술한다. 특히, 부호화되는 객체와 건너뛰어지는 객체의 왜곡을 예측하는 비트율-왜곡 모델을 제시하고, 부호화 성능을 향상시키기 위해 시간적-공간적 절충을 고려한 부호화 모드와 버퍼를 제어하는 방법을 제안한다. 본 논문에서 제안된 객체 기반의 비트율 제어 방법은 넓은 범위의 비트율에서 향상된 성능을 보이며, 목표 비트율에 근접한 압축 비트열을 발생하고, 버퍼 상태를 안정적으로 조절하기 때문에 버퍼 넘침과 버퍼 결핍 현상이 발생하지 않는다.

Keywords

References

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