A ZEROTREE WAVELET VIDEO CODER

This paper describes a hybrid motion-compensated wavelet transform cod er designed for encoding video at very low bit rates. The coder and it s components have been submitted to MPEG-4 to support the functionalit ies of compression efficiency and scalability. Novel features of this coder are the use of overlapping block motion compensation in combinat ion with a discrete wavelet transform followed by adaptive quantizatio n and zerotree entropy coding, plus rate control, The coder outperform s the VM of MPEG-4 for coding of I-frames and matches the performance of the VM for P-frames while providing a path to spatial scalability, object scalability, and bitstream scalability.