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Abstract

An image encoding-decoding system and related methods of operation includes an encoder for encoding a signal carrying a representation of an image and a decoder for decoding a signal carrying a representation of an image. The encoder comprising a first encoder for encoding a signal carrying a representation of an image at a first quality level; and a second encoder for encoding a signal carrying a representation of the image at a second quality level at greater quality than the first quality level. The encoder also comprises a mixer for mixing a factor of a signal carrying a representation of a prediction of the image at the first quality level and a factor of a signal carrying a representation of a prediction of the image at the second quality level to produce a mixed signal. The encoder is arranged such that: the second encoder encodes the signal carrying a representation of the image at a second quality level based on the mixed signal; and the factors are selected based on a measure of noise introduced by the first encoder and the second encoder when producing the predictions. A corresponding decoder and methods of decoding and encoding are also described.

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