Fecha de publicación: 05/01/2023 Fuente: WIPO Rice A data encoding method comprises generating one or more encoding parameters; communicating the one or more encoding parameters for use by a decoding process; and encoding data items representing image data samples of an image by generating residual data indicative of a difference between an image data sample and a predicted version of that image data sample, the encoding step performing the encoding in dependence upon the one or more encoding parameters generated by the generating step; in which the generating step comprises deriving an estimate of the residual data in respect of at least a subset of the image data samples and generating the one or more encoding parameters in dependence upon the derived estimate.