1. Spatial prediction method of a current block of pixels of an image using a plurality of spatial prediction modes based on neighbouring pixels of the current block, comprising: a) determination of a prediction block of the current block according to each of said spatial prediction modes, and b) selection of one of said prediction blocks wherein said method further comprises, prior to steps a) and b): c) detection of redundant spatial prediction modes generating similar prediction blocks, and d) for each pair of redundant spatial prediction modes, generation of an additional spatial prediction mode distinct from the spatial prediction modes of said plurality of spatial prediction modes and replacement of one of the redundant spatial prediction modes by the additional mode.