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1、ISSN1000-9825,CODENRUXUEWE-mail:jos@iscas.ac.cnJournalofSoftware,Vol.9,No.7,July2008,pp.1635−1643http://www.jos.org.cnDOI:10.3724/SP.J.1001.2008.01635Tel/Fax:+86-10-62562563©2008byJournalofSoftware.Allrightsreserved.∗基于对象的三维医学图像形状自适应编码算法1,2+1,21,21,2吴家骥,焦李成,石光明,王磊1(西安电子科技大学智能信息处理研究所,陕西西安710071)
2、2(西安电子科技大学智能感知与图像理解教育部重点实验室,陕西西安710071)Object-BasedShape-AdaptiveCodingMethodforThree-DimensionalMedicalImages1,2+1,21,21,2WUJia-Ji,JIAOLi-Cheng,SHIGuang-Ming,WANGLei1(InstituteofIntelligentInformationProcessing,XidianUniversity,Xi’an710071,China)2(KeyLaboratoryofIntelligentPerceptionandImageUn
3、derstandingofMinistryofEducationofChina,XidianUniversity,Xi’an710071,China)+Correspondingauthor:E-mail:wujj@mail.xidian.edu.cnWuJJ,JiaoLC,ShiGM,WangL.Object-Basedshape-adaptivecodingmethodforthree-dimensionalmedicalimages.JournalofSoftware,2008,19(7):1635−1643.http://www.jos.org.cn/1000-9825/19
4、/1635.htmAbstract:Thepaperproposesashape-adaptivewaveletcodingalgorithmforknownobjectofdiagnosticregionofthree-dimensionalmedicalimages.Thenewalgorithmonlyappliestotheshape-adaptivetransformationofthepixelsinsidetheobjectfordecorrelation.Aftertransformation,thenumberofcoefficientsoftheobjectisa
5、smanyasthatofthepixelsinsidetheimagearea.Toachieveaquickandlosslesstransformation,anovelshape-adaptivewavelettransformbasedonliftingschemeforarbitrarilyshapedobjectisproposed.Byanalyzingthelocationofinvalidcoefficientstransformed,thepaperalsoproposesamodifiedOB-3DSPECK(object-basedsetpartitione
6、dembeddedblockcoder)methodthatcancelssymboloutputsofinvalidblockorcoefficientsoutsidetheobject,specifically,onlytwotypesofsymbolsareoutputtoarithmeticcodingcoder.Forobjectregionofthree-dimensionalmedicalimages,theproposedalgorithmsupportsthelossy-to-losslessembeddeden/decoding.Experimentalresul
7、tsshowthattheproposedalgorithmoutperformsOB-3DSPECKby0.5dBontheaverageSNR.Furthermore,becauseofthereductionoftheoutputofonetypesymbol,thearithmeticcodingbecomesoptional.Keywords:shape-adaptivecoding;embeddedcoding;objects-basedcod
