基于DSP的MPEG4视频压缩算法研究及实现

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1、西北工业大学硕士学位论文基于DSP的MPEG-4视频压缩算法研究及实现姓名：王琦申请学位级别：硕士专业：通信与信息系统指导教师：王永生20060301两北工业大学硕，l：学位论文AbstractInthecurrentdigitaldays，theunremittinglydevelopingMPEG-4standardwellmeetsthetransimissionofdigitalmultimediainformationowingtoitstowbitrateandhighcompensation．Itgainsanex

2、tensiveuseintheinteractivemultimediafield，suchasdigital—television，videotelephone，real—timemultimediainspecting，mobilemultimediacommunicationandnetworkvideoserver．MPEG-4isavideocompressionstandardbasedonobject，whichusesthesecondgenerationcodingtechnologyandhasbeenput

3、moreandmoreattentioninthevideocompressionfield。Nowadays，therealizationofMPEG一4videoencodingbasedonembeddedsystembecamesthehotspotandnodusofcorrelationstudy，sincetheembeddedvideoencodingsystemnotonlycontainsthecharacteristicofhigh—integrationdensity,lowcost，highperfor

4、manceandconvenienceuse，butalsotheMPEG一4compressionalgorithmhasthedeficiencyofcomplexityandthehighrealtimerequirement．DigitalsignalprocessorisusedasmainCPUinkindsofembeddedsystemsincreasinglyonaccountofitshighaccuracy，highspeed，lowpowerdissipation，parallelismandhigh—i

5、ntegrationdensity．Theresearchworkofthispaperisintheserviceofmultimediarescuecommunicationsystem，whichbringsforwardanencoderbasedontheC6000seriesDSPofTI(TMS320C6211)andrealizestheMPEG．4videocompression。Firstly,thepapergivesanoutlineofthev．ideocompressionandbasilictech

6、nologiesofMPEG一4standard。ItintroducesthesignificantalgorithmsofMPEG一4，includingDCT,quantization，motionestimation，motioncompensation，run—lengthencodingandarithmeticcoding．Secondly，itbringstosucc。essaMPEG一4encoderbasedonPCplatform，thentheencoderistransplantedandoptimiz

7、edonDSPplatform。Thirdly，accordingtotheresultsofstatisticaltools，thealgorithmsoftheencoderwhichcostnumerousCPUcyclesarereplacedwithassemblecodes。ThealgorithmstructureisadjustedaccordingtothehardwarecharacteristicsofC621andacertainnumberoftheMPEG一4algorithmareimproved，

8、forinstance，thediamondsearchalgorithminmotionestimationpartandtheMPEGquantizationalgorithminquantizationpartareimproved．Moreover,th