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A fast algorithm of bit stream extraction using distortion prediction based on simulated annealing
YANG Kaifang 1 #,WAN Shuai 2 *,GONG Yanchao 3
1.School of Electronics and Information, Northwestern Polytechnical University, Xi\'an 710072
2.School of Electronics and Information, Northwestern Plytechnical University, Xi'an 710072, China
3.School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
*Correspondence author
#Submitted by
Subject:
Funding: the National Science Foundation of China（No.60902052, 60902081）, the graduate starting seed fund of Northwestern Polytechnical University（No.z2012093）, the Doctoral Fund of Ministry of Education of China （No.No. 20096102120032）
Opened online:20 December 2012
Accepted by: none
Citation: YANG Kaifang,WAN Shuai,GONG Yanchao.A fast algorithm of bit stream extraction using distortion prediction based on simulated annealing[OL]. [20 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4501848
 
 
The scalable video streams can be extracted to meet the bandwidth limitations of different network end-users. Bit stream extraction is usually performed at the network proxy or gateway during transmissions, where a low computational complexity is always preferred. How to quickly and accurately select the best resolution combination for a video to meet different bandwidth requirements by each user is crucial in bit stream extraction. In this paper we proposed a fast algorithm of bit stream extraction for scalable video. The relationship between the base quality layer and the first quality layer was used to predict the distortion of higher quality layers. When quality of every layer is available, the proposed method searches for the optimal combination of quality layers based on simulated annealing. Experimental results show that the proposed method provides an optimized performance which is significantly higher than that can be achieved by the basic extraction method. Compared to the quality layer based extraction method in the reference software model of H.264/SVC (JSVM), the proposed algorithm can greatly decrease the decoding times from 2NT to only 2 without losing rate-distortion performance and can meet the demand of the real-time applications. Furthermore, the proposed method obtains a more smoothed video quality which is always preferable by the end user.
Keywords:Scalable Video Coding (SVC); Bit stream extraction; Real-time processing; simulated annealing; Coarse-grain Quality Scalability (CGS); Medium-grain Quality Scalability (MGS)
 
 
 

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