Applying the MDCT to image compression

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dc.contributor.advisorHerbst, B. M.
dc.contributor.advisorHunter, K. M.
dc.contributor.authorMuller, Rikus
dc.contributor.otherUniversity of Stellenbosch. Faculty of Science. Dept. of Mathematical Sciences. Applied Mathematics.
dc.date.accessioned2009-02-11T15:33:56Zen_ZA
dc.date.accessioned2010-06-01T08:14:49Z
dc.date.available2009-02-11T15:33:56Zen_ZA
dc.date.available2010-06-01T08:14:49Z
dc.date.issued2009-03
dc.descriptionThesis (DSc (Mathematical Sciences. Applied Mathematics))--University of Stellenbosch, 2009.
dc.description.abstractThe replacement of the standard discrete cosine transform (DCT) of JPEG with the windowed modifed DCT (MDCT) is investigated to determine whether improvements in numerical quality can be achieved. To this end, we employ an existing algorithm for optimal quantisation, for which we also propose improvements. This involves the modelling and prediction of quantisation tables to initialise the algorithm, a strategy that is also thoroughly tested. Furthermore, the effects of various window functions on the coding results are investigated, and we find that improved quality can indeed be achieved by modifying JPEG in this fashion.en
dc.identifier.urihttp://hdl.handle.net/10019.1/1197
dc.language.isoen
dc.publisherStellenbosch : University of Stellenbosch
dc.rights.holderUniversity of Stellenbosch
dc.subjectWindowed modified DCTen
dc.subjectJPEG (Image coding standard)en
dc.subjectDiscrete cosine transformsen
dc.subjectImage compressionen
dc.subjectDissertations -- Applied mathematicsen
dc.subjectTheses -- Applied mathematicsen
dc.titleApplying the MDCT to image compressionen
dc.typeThesis
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