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首頁(yè)> 中文期刊> 《計(jì)算機(jī)應(yīng)用》 >面向云桌面協(xié)議的視頻區(qū)域偵測(cè)算法

面向云桌面協(xié)議的視頻區(qū)域偵測(cè)算法

     
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At present,there are some problems when video is played on virtual desktop protocol with partitioning mechanism,such as the video is not smooth and the bandwidth is highly occupied.In this paper,a Video Area Detection Algorithm (VRDA) was proposed based on virtual desktop protocol,called SPICE (Simple Protocol for Independent Computing Environment).Video regions were detected in the process of playing video on virtual desktop protocol,each of which was intercepted as a complete video frame,and decompressed by MPEG4 (Moving Pictures Experts Group-4) video compression algorithm instead of the original compression algorithm MJPEG (Motion JPEG) with lower efficiency.A evaluation metric named DAETD (Difference between Actual and Expected Display Time) was proposed to test the fluency of the improved SPICE,meanwhile,the bandwidth consumption of SPICE was also tested.The experimental results show that the proposed algorithm can improve the video fluency and reduce the network bandwidth consumption.%針對(duì)目前云桌面協(xié)議存在的因分塊機(jī)制引起協(xié)議視頻播放畫(huà)面不流暢、帶寬占用高等問(wèn)題,在獨(dú)立計(jì)算環(huán)境簡(jiǎn)單協(xié)議(SPICE)的基礎(chǔ)上提出了一種視頻區(qū)域偵測(cè)算法(VRDA).首先在云桌面協(xié)議播放視頻的過(guò)程中偵測(cè)識(shí)別視頻播放區(qū)域,然后截取視頻播放區(qū)域的圖像為一塊完整的視頻幀進(jìn)行處理,最后使用動(dòng)態(tài)圖像專家組視頻壓縮標(biāo)準(zhǔn)(MPEG4)視頻壓縮算法替換原壓縮效率不高的運(yùn)動(dòng)靜止圖像壓縮技術(shù)(MJPEG)壓縮解壓視頻幀;同時(shí),提出幀期望與實(shí)際顯示時(shí)間差(DAETD)指標(biāo)作為實(shí)驗(yàn)評(píng)價(jià)指標(biāo),來(lái)驗(yàn)證改進(jìn)后SPICE的視頻播放流暢度,并測(cè)試帶寬占用情況.實(shí)驗(yàn)表明,所提算法有效提高了視頻流暢度,減少了網(wǎng)絡(luò)帶寬占用.

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