A decoding method for decoding an image is disclosed. The decoding method comprises for at least one slice of the image: —decoding (S210) the slice from a bitstream; —determining (S230) information representative of a size of a region of the decoded slice, the size being different from a size of a basic coding block used for decoding the slice; and—filtering (S240) the decoded slice by applying a filter on the region identified by the determined information.