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Design.doc

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WholeDesign- Astheblockdiagramshows,theimagethroughtransformationquantizedandcoding,itiscompressed.Thecodeimagehasfewerbitsthantheoriginalimage,whichiseasiertobetransmittedandstored. Throughtheinversetransformationinversequantizationanddecodingofthecodeimage,theimagecanbereconstructed. Input- Designandimplementation- Inthesoftwareprogram,italsocontainstheinputs,processors,andoutputs. Myprojectisimagedatacompression,sotheimageistheinput. OftenpeoplecangettheimagefromtheInternet,thecamera,ormakeitbypaintingtools.InthisprojectIgettheimagefromtheInternetandnamedit153,whichsavingtypeisJPEG. IntheMATLAB,itoftenusesasthefollowingcodestodefinetheinput. Ifwewanttoknowtheinformationabouttheinput,wecanaddthefollowingcodestoshowit. Itisastructuretoshowthefilename,filesize,format,andsoon. FigureA:informationoftheinput Resulttesting- Figure:inputofuint8style Throughthetable,theinputstyleisuint8.Ithasthreelayersofimage. Usethecodetoshowtheoriginalimage. Figure:originalimage Ifchangesthestyleofinputimageasdoublestyletheshowingoftheimageisthesame. Figure:inputofdoublestyle DClevelshifting- Design- PeopleusuallyuseDClevelshifting(minus128)tomakethevalueofpixeltobecalculatedmoresimply. Inthisproject,Idon`tmaketheimagegetaDClevelshifting.Becausetheimagebothhaslightdots(near255)anddarkdots(near0).Theimagevalueisuint8style,ifeachpixelminus128,allthecalculatedpixelvaluewillbe0,whichoriginalpixelvalueislessthan128. DCT- Designandimplementation- TheDCTfunctionisawaytosavetheamountofcalculation.Theoriginalimagesourceenergyisuniformdistribution.(FigureB)Itneedstocalculateeverypixel.ButthroughtheDCT,theimagesourceenergyisconcentratedinthelowfrequencycoefficients.(FigureC)Itjustneedstocalculatethelowfrequencycoefficients,whichissavingthecalculatingtime.Italsogetsreadyforthecodingpart. FigureB:8*8originalimagesourceenergydistributions(haveDClevelshifting) FigureC:DCTimagesourceenergydistributions Takethe8*8asthesizeofinputimageI. ForDCT,itsalgorithmis WhereMandNarethewidthandheig