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ID:36567501
大小:3.17 MB
页数:81页
时间:2019-05-12
《基于DSP的图像编码与实现》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、北方工业大学硕士学位论文基于DSP的图像编码与实现姓名:苏艳玲申请学位级别:硕士专业:检测技术与自动化装置指导教师:孙德辉20050530Abstl"81ctThispaperstudiesthenetworktransportingandimplementationofimagecompressionwimICETEK—C6711-IDK—YUVimageprocessplatformbasedonTMS320C6711chip,byrealizingremotevideotrafficmonitoringsystem,using
2、JPEGcriterionasabase.NamelytransportingimagedatacompressedtoRCM3200modulebyUART,terminalvisitsimagecompressedthroughIEbrowser.Firstlythispaperintroducessignificanceofimagecoding,theoryofimagecoding,internationalcriterionofimagecoding,thenintroducesthefeaturesofe6000sDS
3、Pandenvironmentofsoftwaredeveloping.RealizingJPEGcompressionencoderinClanguageonPCafterstudyingJPEGcriterion.Butthepurposeistorealizeimagecodingbyhardware,SOtheprogrammodifiedmustbetransplantedtoDSEMostlyfileoperationaremodifiedtomemoryoperationofDSP.Thesourcecodedesig
4、nedonPCisinefficientforDSPplatform,SOcodeoptimizingisnecessary.BasedonthestandardprocedureandsupportedbypowerfuldevelopmenttoolsandimagelibofC6000,thepaperpartlyoptimizesthecodeasfollows:a)adoptingthecompilingoptionstooptimizeprogram;b)usingimagelibsupposedbyTI;C)assig
5、ningthememorysector;d)usingDMAtotransmitthedatebetweeninterandoutermemories;e)modifyingthefimctionspartly;f)usingthekeywordsvolatileandfar.Theoptimizeprogramperform10timesfasterthentheoriginal.Timeneededtoachieveacompressionruduceto03sfrom3SImagedataCompressedbyDSPtran
6、sfertothenetcontrollerimplementedbyRCM3200,whichprovidesnetservicebasedonHTTPprotoc01.ThentheusercanbrowsestheseimagesbyterminalPCwiththeinteractbrowsesoftwarelikeIE.ImageswithdifferentcompressionratioaregainedbymodifytheQ(quality)parameterduringtheexperimentappliedont
7、hisimageprocessplatform.ResultsoftheexperimentimplythatdeclineoftheimagequalityisunconspicuouswhentheQparameterrangesfrom100to30.WhentheQparameterissetto25,theimagequalitydropsdistinctly.ThenaconclusionisdrewthatQparametershouldbesetabout50toobtainboth.II.acceptableima
8、gequalityandcompressionratio.Thepaperhasputforwardimprovementthinkingandmethodofapplyingtonetworktransportingandimple
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