Region-of-interest video coding based on rate and distortion variations for H.263+

Ming Chieh Chi, Mei Juan Chen, Chia Hung Yeh*, Jyong An Jhu


研究成果: 雜誌貢獻期刊論文同行評審

30 引文 斯高帕斯(Scopus)


Region-of-interest (ROI) is an essential task that one must undertake in low bit-rate multimedia communications because of the limited bandwidth of the channels and the transcoder between different standards. In this paper, an effective ROI determination method is proposed. The skin-color extraction is first employed to determine the ROI macroblocks; then, the framework for the adjustment of the quantization parameters (QPs) of ROI macroblocks according to the distortion and bit-rate variations is proposed to fit the target bit rate. In view of the residual distortion information, the fuzzy logic controller proposed in our framework can adaptively adjust the weighting factor for corresponding QPs by the distortion variation in the macroblock layer. A linear prediction formula, derived from the rate variation, is proposed to allocate appropriate bits for each ROI macroblock and maintain the target bit rate and buffer fullness. Experiment results on TMN8 reveal that the proposed ROI video coding can significantly enhance the quality at ROIs. Furthermore, the proposed framework obtains about 0.5 dB gain in the objective performance and also provides the better subjective quality compared with previous works.

頁(從 - 到)127-142
期刊Signal Processing: Image Communication
出版狀態已發佈 - 2008 2月

ASJC Scopus subject areas

  • 軟體
  • 訊號處理
  • 電腦視覺和模式識別
  • 電氣與電子工程


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