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Abstract

An apparatus and method for communicating image sequences through a bandwidth limited channel have circuitry for estimating, for successive images of the sequence, a motion vector field. The motion vector field measures the motion displacement between successive images of the sequence for block regions of the image. A lossy coding circuitry represents the sequentially generated motion vector field for an image as a coded motion signal. An error reconstruction circuitry generates an error signal in response to the vector field coded motion signal and a channel encoder transmits the motion vector field coded signals and the error coded signals over the channel to a receiver. At the receiver, the transmitted error and motion coded signals are received and decoded, and a received image is derived therefrom. The lossy coding circuitry can be any of a number of different circuitries, and in particular, block transform coding can be employed. The transformed coding methods and apparatus are selected to avoid artifacts in the motion vector field and coding process such as blocking effects.

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First Claim