Thesis (DSc (Mathematical Sciences. Applied Mathematics))--University of Stellenbosch, 2009. / The 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.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/1197 |
| Date | 03 1900 |
| Creators | Muller, Rikus |
| Contributors | Herbst, B. M., Hunter, K. M., University of Stellenbosch. Faculty of Science. Dept. of Mathematical Sciences. Applied Mathematics. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Stellenbosch |
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