視頻編碼中的運動估計技術研究.pdf

1、分類號!№!UDC密級編號中國科學院研究生院碩士學位論文Y8【J哇乏21奎至堡指導教師掛渲歪副嬰窺雖蟲國型堂瞳自動絲盟塞逝申請學位級別亟學科專業(yè)名稱讓簋扭廑旦遮盔論文提交日期20055論文答辯日期20056培養(yǎng)單位空墾型堂暄自動絲硒塞壓學位授予單位史圍型堂瞳塑究生院答辯委員會主席中國科學院自動化研究所碩士學位論文Abs訂actAbstlactlnthevideocodmgandprocessingsystem，motionestimat

2、ion(ME)andⅡlotioncompensation(MC)playaveryimpon趾tmleTheycaIlelimin砒etheinter丹拋eredundallcyandiIllpmVe也eperfbrnlanceofthe“deocodeLOn也eonehalld，meaccuracyofmotionestima廿ondirectlya能ctstheemciencyofthevideocodeLIteliminates

3、ⅡleiIlte卜fhmecorrelationandreducesthedemaIldofthestorememoryandnlebandwid也fortransmitting掣eauyOntheo也erha芏ld，mernotionestimationcostsmostofthecodingtimeof也eencoder，thereforetllecomplexityoftheencoderliesonthecomplex時ofth

4、emotionestimationalgorimmIn廿listhesis，wemainlydiscussedmemotionestima垃onandmotioncompensationtechlliquesMoredetailedcontentof也ist11esiscanbedescribedasf01lows：FirsUy，thesub—pixelmotionestimationteclllliquesaredeeplystlld

5、iedThcsub—pixeImotionestimationcanbedividedjntot、陽st印s：sub巾ixe】jn柵polationaIldsubpixelmatcllingInsub—pixel缸elpol撕on，廿1eapplicationsofmuItitap6lterandtheef琵ctofthetapsoftlle矗1tertot】1epfecisjonandcomplexityoftllesublpixe】

6、interpolationalgorimmarestudiedInsubpixelmatching，afastqu礎er_pixelmotionestimationa190ritlllnisproposed，basedonthesta缸sticalallalysjsofthedistributionofquane卜pixelprecisionmotionvectorsThealgori血mreducesthecomplexityofqu

7、arter_pixelmotionestimationgreatlySecondly’memllltiblockmodemotionest豳眥ionalgorithmofverylowbitm￡evideosequencesisstI工diedTheinter_舳memotionoftheverylowbit_mtevideosequencesismuchlesscompared、vithtllatofnlehi曲bit—ratevid

8、eosequences，thusthebitrateis瑚LuchloweLT置1rou曲analyzingthecharacteristicofmeverylowbit—ratevideosequencesandtb【ecorrclationoftllemIlltiblockmodes，afastquarterpixelmotionestimationaIgorithmisproposed，whicho丘brst11ecomputat

9、ionalconlpIexi母andperfornlancetrade—offsinaVerylowbitrateVideocodingschemeFinally，themul廿blockmodemotionestimationisstudiedBasedonmestatisticalcharacteristicof【11emodedismb謝on，twomulti_blockmodemotionestimationalgori廿lms