A method of compressing a block of image elements, each image element having an associated normalized feature vector present in a normalization sub-region of a feature vector space, said method comprising the steps of: identifying, based on at least a portion of said normalized feature vectors, a base vector in said normalization sub-region; coding, if a position-determining coordinate of said base vector is present in a defined selection section of said feature vector space, at least one image element of said block according to a default compression mode involving determining a first distribution of multiple normalized representation vectors which are used as coded representations of said normalized feature vectors and an auxiliary compression mode involving determining a second, different distribution of multiple normalized representation vectors which are used as coded representations of said normalized feature vectors, said second, different distribution of multiple normalized representation vectors comprises normalized feature vectors that are not representable according to said default compression mode; selecting the compression mode of said default compression mode and said auxiliary compression mode based on a default compression mode error and an auxiliary compression mode error; and mapping, if said selected compression mode is said auxiliary compression mode, said position-determining coordinate to get a mapped position-determining coordinate present in a mapped selection section positioned outside of said normalization sub-region, wherein a compressed representation of said block comprises a representation (610, 630) of said mapped position-determining coordinate if said selected compression mode is said auxiliary compression mode and a representation (610, 630) of said position-determining coordinate if said selected compression mode is said default compression mode. identifying, based on at least a portion of said normalized feature vectors, a base vector in said normalization sub-region; coding, if a position-determining coordinate of said base vector is present in a defined selection section of said feature vector space, at least one image element of said block according to a default compression mode involving determining a first distribution of multiple normalized representation vectors which are used as coded representations of said normalized feature vectors and an auxiliary compression mode involving determining a second, different distribution of multiple normalized representation vectors which are used as coded representations of said normalized feature vectors, said second, different distribution of multiple normalized representation vectors comprises normalized feature vectors that are not representable according to said default compression mode; selecting the compression mode of said default compression mode and said auxiliary compression mode based on a default compression mode error and an auxiliary compression mode error; and mapping, if said selected compression mode is said auxiliary compression mode, said position-determining coordinate to get a mapped position-determining coordinate present in a mapped selection section positioned outside of said normalization sub-region, wherein a compressed representation of said block comprises a representation (610, 630) of said mapped position-determining coordinate if said selected compression mode is said auxiliary compression mode and a representation (610, 630) of said position-determining coordinate if said selected compression mode is said default compression mode.