Abstract
A method for transmission of high resolution still pictures at 64K bit/s using subband coding and a modified H261 video codec is proposed. It consists of applying a 4-band subband decomposition to the picture, generating four subbands with a quarter of the original resolution and transmitting each hand using a modified H261 codec. A theoretical analysis of the interaction between DCT-based codecs and the subband analysis/synthesis is given. The proposed scheme is compared to that in which the image is divided into four parts, each one being transmitted using an H261 codec alone. Simulation results show that the proposed method can reconstruct an image up to four times faster than that using the H261 alone. In addition, the progressive build up obtained with this method is very pleasant to the human observer.
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