Publications (1)0 Total impact
[show abstract] [hide abstract]
ABSTRACT: In this paper. we propose an improved multiresolution two-layer video codec that can operate at a base layer of 64 kbps and a variable bit rate second layer (VBR). The basic idea is to use multiresolution technique to reduce the original CIF forma(video to QCII. format. The lou-resolution video is then encoded \vith an improved H.361 codec recently proposed in 141. To reduce the bit rate of the second layer. the residuals are encoded with discrete cosine transform (DCT) using perceptually weighted quantization step sizes. Simulation results show that the Miss America sequence can be transmitted at 64 kbps in CIF lomiat with reasonably good picture qualit).. For good picture qualit).. the second l a p \vould t).pically require I90 hbps.
The University of Hong Kong
- Department of Electrical and Electronic Engineering
Hong Kong, Hong Kong