An efficient layered video codec based on DCT pyramid

In this paper, we introduce a multilayered video coding technique to provide spatial scalability. The proposed scheme generates multilayered bitstreams for scalable multicast video transmission in heterogeneous environments as well as overcomes the major drawback of layered coding which is the increase in the total bit rate. We also minimize the picture drift problem associated with the lower resolution layer by introducing a separate drift compensation layer. Simulation results show that the drift compensation layer improves the lower resolution layer quality without significantly affecting the higher layer coding efficiency. Compared to H263+, although our coder generates more bits at the base layer, but the overall bit rate is less than that of H263+.