No abstract

In this paper, a scalable hybrid video codec has been developed for HDTV video signals. The intra frame pictures are coded based on wavelet transform and inter frame pictures are coded with a standard MPEG-2 codec.By scalable coding of HDTV, channels transmit with various speeds and capacities; In addition, receivers can work at different resolutions. Base layer and enhancement layer of the frame picture are coded with same codec. This paper compares scalable hybrid coding with scalable MPEG-2 codec and scalable DWT2 method for HDTV video signals. It is showed that the quality of intra frame improves by using the proposed codec in comparison with two other methods. By this improvement, the quality of sequence increases.