Joint shape and texture rate control for MPEG-4 encoders

Anthony Vetro, Huifang Sun, Yao Wang

Research output: Contribution to journalConference articlepeer-review


This paper describes an algorithm which can achieve a constant bit rate when coding multiple video objects. First, an initial target estimate is made for each object. Based on the buffer fullness, the total target is adjusted and then distributed proportional to the relative size, motion, and variance of each object. Based on the new individual target rates and rate distortion model for coding the texture of each object, appropriate quantization parameters are calculated. After each object is encoded, the texture model parameters for each object are updated, and if necessary, frames are skipped to ensure that the buffer does not overflow. To provide a proper trade-off between spatial and temporal coding, the proposed rate control algorithm switches between a high rate coding mode and a low rate one. In the low rate mode, a mechanism to control the parameters for shape coding is included. Overall, the algorithm is able to successfully achieve the target bit rate, effectively code arbitrarily shaped objects, and maintain a stable buffer level.

Original languageEnglish (US)
Pages (from-to)V-285-V-288
JournalProceedings - IEEE International Symposium on Circuits and Systems
StatePublished - 1998
EventProceedings of the 1998 IEEE International Symposium on Circuits and Systems, ISCAS. Part 5 (of 6) - Monterey, CA, USA
Duration: May 31 1998Jun 3 1998

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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