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Adaptive quadtree coding of motion-compensated image sequences for use on the broadband ISDN

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3 Author(s)
X. Zhang ; Dept. of Electr. Eng., New South Wales Univ., Campbell, ACT, Australia ; M. C. Cavenor ; J. F. Arnold

An image-coding technique is described in which an adaptive quadtree scheme is used to encode motion-compensated difference images. A mechanism is determined within the encoding process that allows a predetermined level of image quality to be selected by the user at call setup time and then maintained by the encoder. The coder operates in a variable-bit-rate mode providing a video service of near-constant image quality. A multilayered version of the coding scheme is also described in which the degradation caused by cell loss during transmission can be limited in its effect and removed completely within a short period of time. The recovery from cell loss is achieved by sending blocks from the original image sequence whenever cells are known to have been deleted by the local-network access node

Published in:

IEEE Transactions on Circuits and Systems for Video Technology  (Volume:3 ,  Issue: 3 )