Browsing by Author "Shen, Meng-Wei"

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135-MHz 258-K Gates VLSI Design for All-Intra H.264/AVC Scalable Video Encoder
(2013-04-01)
Li, Gwo-Long
;
Chen, Tzu-Yu
;
Shen, Meng-Wei
;
Wen, Meng-Hsun
;
Chang, Tian-Sheuan
To satisfy the video application diversities, an extension of H.264/advanced video coding (AVC), called scalable video coding (SVC), is designed to provide multiple demanded video data via a single video encoder. However, constructed on the fundamental of H.264/AVC, the complexity of SVC is much higher than that of H.264/AVC. In this paper, a VLSI design for all-intra scalable video encoder is proposed to aim at efficient scalable video encoding. First, the memory bandwidth requirements for several encoding methods are analyzed to find out the best encoding method which can achieve best tradeoff between internal memory usage and external memory access. Afterward, an all-intra SVC encoder combined with several advanced techniques, including fast intra prediction algorithm, efficient syntax element encoding approach in context-adaptive variable-length coding, and hardware-efficient techniques, are implemented in a macroblock (MB)-level pipeline to increase data throughput. Implementation results demonstrate that our proposed SVC encoder can process more than 594-k MBs per second, which is equivalent to the summation of 60 high-definition, 1080-p, SD 480-p, and common intermediate format frames under 135-MHz working frequency. The proposed design consumes 258-K gate counts when synthesized by 90-nm CMOS technology.
A Memory Efficient Fine Grain Scalability Coefficient Encoding Method for H.264/AVC Scalable Video Extension
(2009)
Shen, Meng-Wei
;
Li, Gwo-Long
;
Chang, Tian-Sheuan
;
電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
In this paper, a memory efficient Fine Grain Scalability (FGS) coefficient encoding method is proposed to reduce the external memory access requirement. In the H.264/AVC Scalable Video Extension, the FGS coefficients encoding is frame based. However, the frame based mechanism results in the difficulty of hardware implementation due to large internal memory requirements and external memory accesses. Therefore, a non-uniform memory size design which can achieve low external memory access is proposed to realize the macroblock based FGS coefficients encoding. Compared to previous work, our proposed method can save at least 38KB external memory accesses per frame in average.