一種改進(jìn)的可分級(jí)視頻編碼方法及其網(wǎng)絡(luò)傳輸研究
Research on an Improved Scalable Video Coding and the Network Transmission
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摘要: 該文提出了一種改進(jìn)的可分級(jí)視頻編碼方法。為了適應(yīng)流媒體的分層傳輸要求,該方法通過(guò)對(duì)DCT系數(shù)量化殘差的位平面編碼產(chǎn)生視頻流的增強(qiáng)層部分,其基本層碼流由更多的子基本層組成,各子基本層通過(guò)宏塊級(jí)DCT系數(shù)重排及VLC重組生成。同時(shí),該文設(shè)計(jì)了一種針對(duì)該分層視頻流數(shù)據(jù)的網(wǎng)絡(luò)傳輸自適應(yīng)不等重丟包保護(hù)(AUPLP)策略,在估計(jì)當(dāng)前可利用帶寬資源的基礎(chǔ)上,實(shí)時(shí)調(diào)整不同層數(shù)據(jù)的保護(hù)力度,并控制傳輸截?cái)嗟膶訑?shù)。仿真結(jié)果表明,與傳統(tǒng)方法相比該文方案在低帶寬時(shí)可獲得平均1.2dB的編碼增益,AUPLP的應(yīng)用也大大改善了視頻流媒體的傳輸質(zhì)量。
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關(guān)鍵詞:
- 視頻編碼方法; 位置重排; MPEG4-FGS; PFGS; AUPLP
Abstract: An improved scalable video coding scheme is proposed in this paper. The method generates the base layer including some sub-base layers by DCT coefficients reordering and VLC reshuffling, and the residues between the original DCT coefficients and the reconstructed DCT coefficients of the base layer are encoded in the enhancement layer with bit-plane coding technology. To transmit the layered streaming video generated by the proposed scheme over the IP network, an Adaptive Unequal Packet Loss Protect (AUPLP) strategy is designed to determine the current available network bandwidth and adjust sending rates according to different situation. Experimental results show that the proposed scheme can improve the average coding efficiency up to 1.2dB compared with conventional methods in low bandwidth, and the AUPLP strategy can further improve the performances of video network transmission system. -
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