A reconstruction method comprising: obtaining (811) a region predictor for a current region of a picture based on a spatial prediction: obtaining (812) an information representative of a partitioning of the current region into sub-regions: reconstructing (813) at least one residual sub-region based on an intra prediction residual and an intra prediction mode and obtaining a reconstructed residual region from the at least one reconstructed residual sub-region, wherein all reference samples external to the current region used for reconstructing the at least one sub-region are set to zero before reconstructing the at least one residual sub-region: and, reconstructing (814) the current region based on the reconstructed residual region and on the region predictor by adding a final predictor obtained from the region predictor and the reconstructed residual region.