Streit, Jürgen Stefan (1996) Digital image coding. University of Southampton, Doctoral Thesis.
Abstract
In this thesis we have studied a range of video encoding techniques and presented three novel very low bit rate codecs operating in the range of 5-12 kbit/s. Specifically, arbitrarily programmable, but fixed-rate cost-gain quantised discrete cosine transformed (DCT0, vector quantised (VQ) and quad-tree (QT) decomposed, parametrically enhanced videophone codecs using quarter common intermediate format (QCIF) video sequences have been proposed as a direct replacement for mobile radio voice codecs in second generation systems, such as the Pan-European GSM, the American IS-54 and IS-95 as well as the Japanese systems. Their complexity, video quality and error resilience have been analysed and compared to established coding standards such as the MPEG-2 and the H261 standard.
In the second part of this study, we focused on error resilient video encoding at higher resolutions, up to high definition television (HDTV) resolution. We compared several low complexity techniques such as differential pulse code modulation (DPCM), block truncation coding (BTC) and subband coding. Finally we proposed a motion compensated, DCT based codec for the wireless environment.
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