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dc.contributor.authorPaliwal, KK
dc.contributor.authorSo, S
dc.date.accessioned2017-05-03T13:01:33Z
dc.date.available2017-05-03T13:01:33Z
dc.date.issued2005
dc.date.modified2009-09-21T05:51:35Z
dc.identifier.issn1051-2004
dc.identifier.doi10.1016/j.dsp.2004.11.002
dc.identifier.urihttp://hdl.handle.net/10072/4280
dc.description.abstractIn this paper, a simple technique for encoding fractional bit components used in fixed-rate Gaussian mixture model-based (GMM) block quantisers is presented. While block transform image coding has not been very popular lately in the presence of current state-of-the-art wavelet-based coders, the GMM-based block quantiser, without the use of entropy coding, is still very competitive in the class of fixed-rate transform coders. It consists of a set of individual block quantisers operating at different bitrates, and the problem is that these bitrates are mostly fractional. Fixed-rate block quantisers based on an integer number of bits can be designed and through the use of heuristic algorithms, can approach the fractional target rate. However, the use of level-based scalar quantisers in the block quantiser allows better utilisation of the bit budget; a finer `spread' of the bit budget across components; and better preservation of optimality. Our technique, which is based on a generalisation of positional value number systems, allows the use of level-based scalar quantisers in a fixed-rate coding framework. Experimental results comparing the use of the bits-based GMM-based block quantiser with the levels-based one in image coding show a finite improvement in the PSNR performance.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeUSA
dc.publisher.urihttp://www.elsevier.com/wps/find/journaldescription.cws_home/622818/description#description
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom255
dc.relation.ispartofpageto275
dc.relation.ispartofjournalDigital Signal Processing
dc.relation.ispartofvolume15
dc.rights.retentionY
dc.subject.fieldofresearchMechanical engineering
dc.subject.fieldofresearchCommunications engineering
dc.subject.fieldofresearchEngineering
dc.subject.fieldofresearchInformation and computing sciences
dc.subject.fieldofresearchcode4017
dc.subject.fieldofresearchcode4006
dc.subject.fieldofresearchcode40
dc.subject.fieldofresearchcode46
dc.titleA fractional bit encoding technique for the GMM-based block quantisation of images
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Engineering
gro.rights.copyright© 2005 Elsevier : Reproduced in accordance with the copyright policy of the publisher : This journal is available online - use hypertext links.
gro.date.issued2005
gro.hasfulltextNo Full Text
gro.griffith.authorPaliwal, Kuldip K.
gro.griffith.authorSo, Stephen


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