Method for decoding a coded data stream representative of at least one image, said image being divided into blocks, characterised in that the decoding method comprises the following steps, for at least one block of the image, referred to as the current block: - determining if the current block is coded according to an intra coding mode or another coding mode, the intra coding mode being a coding mode using an intra prediction mode selected from a group of intra prediction modes according to at least one intra prediction mode associated with a neighbouring block of the current block, - when the current block is coded according to said intra coding mode: - determining, for the current block, an intra prediction mode in said group of intra prediction modes according to at least one intra prediction mode associated with a previously decoded block of the image, - decoding said current block according to said determined intra prediction mode, - associating with the current block of said determined intra prediction mode, - when the current block is coded according to said other coding mode: - decoding said current block according to said other coding mode, - determining, for the current block, an intra prediction mode in said group of intra prediction modes, - associating with said current block of said determined intra prediction mode, and during the decoding of a block following the current block: - using said intra prediction mode previously associated with the current block to predict an intra prediction mode of the following block if said following block is coded according to an intra coding mode or determining an intra prediction mode to be associated with said following block if said following block is coded according to a coding mode distinct from the intra coding mode. - determining if the current block is coded according to an intra coding mode or another coding mode, the intra coding mode being a coding mode using an intra prediction mode selected from a group of intra prediction modes according to at least one intra prediction mode associated with a neighbouring block of the current block, - when the current block is coded according to said intra coding mode: - determining, for the current block, an intra prediction mode in said group of intra prediction modes according to at least one intra prediction mode associated with a previously decoded block of the image, - decoding said current block according to said determined intra prediction mode, - associating with the current block of said determined intra prediction mode, - determining, for the current block, an intra prediction mode in said group of intra prediction modes according to at least one intra prediction mode associated with a previously decoded block of the image, - decoding said current block according to said determined intra prediction mode, - associating with the current block of said determined intra prediction mode, - when the current block is coded according to said other coding mode: - decoding said current block according to said other coding mode, - determining, for the current block, an intra prediction mode in said group of intra prediction modes, - associating with said current block of said determined intra prediction mode, and - decoding said current block according to said other coding mode, - determining, for the current block, an intra prediction mode in said group of intra prediction modes, - associating with said current block of said determined intra prediction mode, and - using said intra prediction mode previously associated with the current block to predict an intra prediction mode of the following block if said following block is coded according to an intra coding mode or determining an intra prediction mode to be associated with said following block if said following block is coded according to a coding mode distinct from the intra coding mode.