The authors outline the SPECTRE coding algorithm which achieves the required data compression whilst maintaining broadcast quality. It is based on the hybrid discrete cosine transform (DCT) coding scheme, with motion compensated prediction. It also uses an advanced interpolative prediction technique, employing information from both previous and next frames. The algorithm has been optimised in simulations to operate at 12 Mbit/s, but in principle other bit rates are possible for different applications. Furthermore, it can dynamically adjust to changes in picture content, allocating any spare capacity in the video stream during periods of low picture activity to additional data services.
展开▼
