教育背景
工學(xué)學(xué)士 (系統(tǒng)工程),國防科學(xué)技術(shù)大學(xué), 中國, 1995;
工學(xué)博士 (系統(tǒng)工程), 國防科學(xué)技術(shù)大學(xué), 中國, 2000.
社會兼職
中國計(jì)算機(jī)學(xué)會: 多媒體技術(shù)專業(yè)委員會秘書長 (2007-).
科研概況
研究領(lǐng)域
多媒體與網(wǎng)絡(luò)
虛擬現(xiàn)實(shí)
研究概況
多媒體應(yīng)用將朝著網(wǎng)絡(luò)化、交互性和真實(shí)感的方向發(fā)展，研究工作期望解決3D視頻的獲取表示、編碼傳輸、顯示交互中的基礎(chǔ)問題，實(shí)現(xiàn)3D視頻的互聯(lián)網(wǎng)應(yīng)用，取得了如下成果：
1. 異構(gòu)對等網(wǎng)絡(luò)流媒體技術(shù)方向：采用統(tǒng)計(jì)/隨機(jī)建模的方法為應(yīng)用層組播建立了統(tǒng)計(jì)鏈路模型，發(fā)現(xiàn)了相鄰應(yīng)用層鏈路的擁塞狀態(tài)具有馬爾可夫特性；根據(jù)對實(shí)際點(diǎn)播系統(tǒng)和P2P直播系統(tǒng)的日志研究，發(fā)現(xiàn)并闡述了用戶當(dāng)前在線時(shí)間與其預(yù)期在線時(shí)間的行為模型，提出一種具有低分裂特性的組播樹構(gòu)造算法；從理論上分析了基于拉模式的P2P流媒體算法的帶寬利用近似最優(yōu)性，并且提出基于推拉結(jié)合的算法，保持帶寬利用最優(yōu)，大幅降低了延遲和控制開銷。
2. 多視點(diǎn)/3D視頻編碼與流化方向：提出一種支持視點(diǎn)隨機(jī)訪問的多視點(diǎn)視頻編碼方案和相關(guān)算法，在降低視點(diǎn)切換延遲的前提下，編碼效率較傳統(tǒng)多路視頻獨(dú)立編碼提高2－3db；應(yīng)用有向無環(huán)圖的理論，提出了基于多核處理器體系結(jié)構(gòu)的多視點(diǎn)視頻編碼時(shí)空數(shù)據(jù)并行算法，能夠在多種硬件平臺上獲得接近線性的加速比；通過合理抽象多媒體應(yīng)用和多核處理器的關(guān)鍵特質(zhì)，提出了首個(gè)多核媒體處理任務(wù)調(diào)度評價(jià)體系模型，具有精準(zhǔn)的估測效果；利用視點(diǎn)間數(shù)據(jù)的相關(guān)性，提出了一種基于混合結(jié)構(gòu)覆蓋網(wǎng)絡(luò)的大規(guī)模多視點(diǎn)視頻協(xié)作傳輸框架與關(guān)鍵技術(shù)，能夠提供具有延遲保證的服務(wù)質(zhì)量和大規(guī)模系統(tǒng)擴(kuò)展能力；最后，基于以上研究成果設(shè)計(jì)實(shí)現(xiàn)一個(gè)面向網(wǎng)絡(luò)直播/點(diǎn)播的自由視點(diǎn)3DTV原型系統(tǒng)。
獎(jiǎng)勵(lì)與榮譽(yù)
IEEETrans. On Circuits and Systems for Video Technology: 最佳論文獎(jiǎng) (2010)
學(xué)術(shù)成果
[1] Yi Pang, Lifeng Sun, Weidong Hu, Shiqiang Yang, A Framework for Heuristic Scheduling for Parallel Processing on Multicore Architecture: A Case Study with Multiview Video Coding, IEEE Trans. On Circuits and Systems for Video Technology special issue on Algorithm/Architecture Co-Exploration of Visual Computing, VOL. 19, NO. 11, 2009. Best Paper Award.
[2] Peng Cui, Li-Feng Sun, Fei Wang, Shi-Qiang Yang, Contextual Mixture Tracking, IEEE Transactions on Multimedia, vol. 11, no. 2, pp. 335-344, 2009.
[3] Meng Zhang, Qian Zhang, Lifeng Sun, Shiqiang Yang, Understanding the Power of Pull-based Streaming Protocol: Can We Do Better? IEEE Journal on Selected Areas in Communications, VOL. 25 No. 9, pp. 1-15, 2007.
[4] Meng Zhang, Yongqiang Xiong, Qian Zhang, Lifeng Sun, Shiqiang Yang: Optimizing the Throughput of Data-Driven Peer-to-Peer Streaming. IEEE Trans. On Parallel Distributed System. Vol.20, No.1, pp. 97-110, 2009.
[5] Sun, Lifeng; Liang, Ke; Ouyang, Juntao; Zhong, Yuzhuo, An energy-aware cooperative distributed video coding scheme for ad hoc video sensor network, Chinese Journal of Electronics, Vol.16 No.3, pp. 379-384, 2007.
[6] SUN Li-feng, LI Fang, ZHONG Yu-zhuo, YANG Shi-qiang, Multiview Video Based Virtual Teleconferencing Synthesizing, Journal of Electronics, Vol.33 No.2, pp. 193-196, 2005(in Chinese).
[7] Yi PANG, Jiangtao WEN, Lifeng SUN, Weidong HU, Shiqiang YANG, Frame-level Heuristic Scheduling Multi-view Video Coding on Symmetric Multi-core Architecture, IEEE International Conference on Image Processing (ICIP), Nov, 2009, Cairo, Egypt.
[8] Zhibo CHEN, Meng ZHANG, Lifeng SUN, Shiqiang, YANG, OVERLAY COLLABORATION TOWARDS MINIMIZED BANDWIDTH COSTS IN MULTI-VIEW STREAMING, IEEE ICASSP2009, Taiwan May, 2009.
[9] Meng Zhang, Lifeng Sun, Xiaolu Xi, Shiqiang Yang: iGridMedia: Providing Delay-Guaranteed Peer-to-Peer Live Streaming Service on Internet. GLOBECOM, pp. 1741-1745, 2008.
[10] PANG Yi, SUN Lifeng and YANG Shiqiang, Spatial and Temporal Data Parallelization of Multi-view Video Encoding Algorithm, Greece, IEEE Workshop on Multimedia Signal Processing (MMSP2007), 2007,10, Best Student Paper Candidates.
[11] Lifeng Sun, Yuzhuo Zhong, Zhun Zhong, Natural Interaction Synthesizing in Virtual Teleconferencing, IEEE International Conference on Image Processing(ICIP), pp. 405-408, 2002。
