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Title: A novel constant quality rate control scheme for object- based encoding
Keywords: Bit allocation, constant quality, rate control, MPEG-4, multiple video objects, segmentation.
Issue Date: 1-Feb-2006
Citation: ANG YING HANN (2006-02-01). A novel constant quality rate control scheme for object- based encoding. ScholarBank@NUS Repository.
Abstract: In this paper, a novel Constant Quality Rate Control (CQRC) algorithm is proposed for object-based (MPEG-4) video codecs. Instead of minimizing distortion of every single frame or minimizing average frame distortion, this controller seeks to minimize the variation of the frame distortion in order to achieve consistent quality for whole video sequences. The CQRC algorithm uses a linear rate control model to estimate frame-level bit allocation based on a target distortion measure, and a quadratic Rate-Quantization model to calculate the quantization parameter for the current frame. The scheme is then further extended to encompass multiple (arbitrary shaped) video objects by means of a bitrate distribution algorithm. Experimental results demonstrate the ability of the CQRC algorithm to achieve an output sequence with lesser flickering effects and motion jerkiness compared to MPEG-4a??s Scalable Rate Control Scheme, under numerous real-life constraints.
Appears in Collections:Master's Theses (Open)

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