OPTIMUM BIT ALLOCATION FOR FGS VIDEO CODING (TP-P7)

Author(s) : Jun Xie (School of Computer Engineering, Nanyang Technological University, Singapore) Liang-Tien Chia (School of Computer Engineering, Nanyang Technological University, Singapore) Bu-Sung Lee (School of Computer Engineering, Nanyang Technological University, Singapore)

Abstract : This paper proposes a new bit allocation scheme for Fine-Granular-Scalability (FGS) video coding, through which we can achieve better video quality. Different from traditional rate-distortion (R-D) optimization schemes, we consider the characteristics of the bit-plane (BP) coding method. To be specific, we first find the approximate linear relationship between the bitrate of the FGS-layer and the percentage of non-zero binary-scaled coefficients (NZBC) in each BP; second, with mathematical justification, we derive an optimal strategy by analyzing the overall distortion with respect to NZBC. Finally, we perform our optimal bit allocation on a FGS coder. Experimental results prove that our scheme can achieve smooth video quality with a higher average PSNR gain compared with uniform bit allocation. And for certain frames with lower PSNR, it has a gain of up to 3dB. It is highly source-independent and more robust compared with previous bit allocation schemes.

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