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1、第7期賀強(qiáng)等:針對(duì)移動(dòng)視頻終端的基于感興趣區(qū)域的快速轉(zhuǎn)換編碼·39·針對(duì)移動(dòng)視頻終端的基于感興趣區(qū)域的快速轉(zhuǎn)換編碼賀強(qiáng)1,楊高波1,2,張兆揚(yáng)3(1.湖南大學(xué)計(jì)算機(jī)與通信學(xué)院,湖南長(zhǎng)沙410082;2.南京郵電大學(xué)圖像處理與圖像通信江蘇省重點(diǎn)實(shí)驗(yàn)室,江蘇南京210003;3.新型顯示技術(shù)及應(yīng)用集成教育部重點(diǎn)實(shí)驗(yàn)室(上海大學(xué)),上海200072)摘要:提出一種針對(duì)移動(dòng)終端,基于感興趣區(qū)域(ROI)的快速轉(zhuǎn)換編碼方案。首先,根據(jù)移動(dòng)終端的顯示尺寸,在視頻服務(wù)器端利用視覺關(guān)注度模型從H.264視頻流自動(dòng)地檢
2、測(cè)出ROI。然后,在代理服務(wù)器端根據(jù)ROI轉(zhuǎn)換編碼生成適合于移動(dòng)終端的視頻流。此外,針對(duì)此轉(zhuǎn)碼體系提出了一種快速模式選擇算法。仿真實(shí)驗(yàn)結(jié)果表明,本方案可在降低網(wǎng)絡(luò)占用帶寬的情況下,獲得較好的主觀視覺效果,并且計(jì)算量小。關(guān)鍵詞:視頻轉(zhuǎn)換編碼;感興趣區(qū)域;視頻服務(wù)器;快速模式選擇中圖分類號(hào):TP391.1文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000-436X(2009)07-0036-05Region-of-interestbasedfasttranscodingformobilevideoterminalsHEQi
3、ang1,YANGGao-bo1,2,ZHANGZhao-yang3(1.SchoolofComputer&Communication,HunanUniversity,Changsha410082,China;2.KeyLabofImageProcessingandImageCommunication,NanjingUniversityofPostsandTelecomm,Jiangshu210003,China;3.KeyLaboratoryofAdvancedDisplayandSystemApp
4、lications(ShanghaiUniversity),MinistryofEducation,Shanghai200072,China)Abstract:Afasttranscodingschemebasedonregionofinterest(ROI)wasproposedformobilevideoterminals.Accordingtothetargetdisplayingsize,theROIswereautomaticallydetectedfromtheinputH.264vide
5、ostreambasedonvisualattentionmodelinthevideoserver.Thevideostreamwasautomaticallygeneratedattheproxyserverbyvideotranscodingformobileterminals.Moreover,afastmodedecisionalgorithmwasproposedforvideotranscoding.Experimentalresultsdemonstratethatthepropose
6、dapproachcannotonlyreducethebandwidthoccupation,butalsoobtainexcellentvideoqualitywithalowcomputationalcomplexity.Keywords:videotranscoding;regionofinterest;videoserver;fastmodedecision第7期賀強(qiáng)等:針對(duì)移動(dòng)視頻終端的基于感興趣區(qū)域的快速轉(zhuǎn)換編碼·39·1引言收稿日期:2008-06-21;修回日期:2009-05-20
7、基金項(xiàng)目:圖像處理與圖像通信江蘇省重點(diǎn)實(shí)驗(yàn)室開放課題基金資助項(xiàng)目(ZK207006);新型顯示技術(shù)及應(yīng)用集成教育部重點(diǎn)實(shí)驗(yàn)室(上海大學(xué))開放課題基金資助項(xiàng)目(P200801);湖南省青年骨干教師培養(yǎng)對(duì)象基金資助項(xiàng)目(2008025)FoundationItems:TheResearchFundoftheJiangsuKeyLaboratoryofImageProcessingandImageCommunication(ZK207006);TheKeyLaboratoryofAdvancedDispla
8、yandSystemApplications(ShanghaiUniversity),MinistryofEducation(P200801);TheProjectofKeyYouthTeachersTrainingProgramofHunanProvince(2008025)隨著無線網(wǎng)絡(luò)的發(fā)展,人們對(duì)無線視頻通信的需求越來越強(qiáng)烈。但是,對(duì)于移動(dòng)終端來說,存在2個(gè)突出的難題:首先是受到無線網(wǎng)絡(luò)帶寬的約束,難以滿足高分辨率視頻的帶寬要求;其次,由于移動(dòng)終端