Video coding using 3-D subband decomposition for channel error compensation on an ATM network

To transmit a video signal over broadband networks, the first step is to compress the video stream in order to reduce the bit rate. However, the lossy nature of broadband networks will degrade the quality of loss sensitive applications such as a compressed video signal. In this paper, a video subband coding system is discussed, which allows us to compensate the information losses due to packet loss. This subband coding system treats the video over its three dimensions. One in time and two others in spatial. For the two spatial dimensions, a non-separable filter bank is used which provides better performances. The main idea in this coding system is that several channels with different priorities are offered. This novel scheme proposes to transmit the video signal over the network with different levels of protection. So, even if packet loss occurs in the network, the most important part of information will be transmitted over a very protected channel and the rest of information which just allows us to increase the quality is sent over a normal channel. The simulation results show the 3-D subband coding performance which is compared to the conventional coding system as MPEG in the same circumstances