基于dct的图像压缩技术研究与仿真实现 计算机专业英语毕业论文

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1、基于DCT的图像压缩技术研究与仿真实现AbstractDiscreteCosineTransform(DiscreteCosineTransform,referredtoasDCT)isoftenconsideredtobethevoiceandimagesignalsasthebestwayoftransforming.Inordertoachievetherequiredengineering,manyscholarsathomeandabroadtospendalotofenergytofindorimprovefastDCTalgorithms.withthedevelop

2、mentofDSPinrecentyears,couplingwiththeadvantagesofASICdesign,DCTfirmlyestablishedanimportantpositioninthecurrentimagecodingalgorithm,astobeanimportantpartofthecodingofH.261,JPEG,MPEGandotherinternationalstandardsonthepublic.MATLABisbytheAmericanMath-Worksintroducedforthenumericalcomputationand

3、graphicsprocessingforscientificcomputingsoftware,whichcombinesnumericalanalysis,matrixcomputation,signalprocessingandgraphicsdisplayfunctionsinoneandconstitutesaconvenientuser-friendlyenvironment.TheImageProcessingToolboxsinMATLAB,isthesetofpackagesofmanyMATLABtechnicalcomputingenvironment.Thi

4、spaperdiscussestheDCTtransformmethods,anddiscussesappliedfunctionsoftheimageprocessingtoolboxinMATLABandimplementrelatedtotheuseofClanguagetoimplementthediscretecosinetransformimagecompressionalgorithmsimulation.KEYWORD:DiscreteCosineTransform(DCT);MATLAB;VC6.0,DCTTransformationmethod;ImagePro

5、cessing;ImageCompression;CATALOGABSTRACTV1INRODUCTION72BASICPRINCIPLESANDMODELOFIMAGECOMPRESSION92.1Basicprinciplesofimagecompression92.1.1Thebasicideaofimagecompression92.1.2Imagecompressionmethod92.1.3Imagecompressionstandard102.2Imagecompressionsystemflowchart102.3Analysisofthemainmoduleofi

6、magecompression112.3.1Colorspaceconversion112.3.2DiscreteCosineTransform122.3.3Quantization132.3.4"Z"shapedscan132.3.5Encodinganddecoding142.4Thepurposeofimagedatacompression152.5Basicmodelofimagecompression163DISCRETECOSINETRANSFORMINCLANGUAGEANDMATLABSIMULATION183.1DiscreteCosineTransform183

7、.2TheFunctionofMatlab183.3DiscreteCosineTransforminClanguageandMatlabsimulation19CONCLUSION24APPENDIX261INRODUCTIONInthe21stcentury,mankindhasenteredtheinformationsociety,andnewinformationtechnologyrevolutiontothegrowinghumanbeingsurrou