Image encoding method, image decoding method, image encoding device, image decoding device, and image encoding/decoding device

摘要

Provided is an image encoding method enabling an improvement in encoding efficiency using adaptive bit depth. The image encoding method that encodes an image and generates an encoded stream comprises: a first write step (S1001) for writing a first parameter indicating a first bit depth, which is the bit depth of a reconstructed sample of the image, to a sequence parameter set in the generated encoded stream; and a second write step (S1002) for writing a second parameter that is different to the first diameter and that indicates a second bit depth, which is the bit depth of an Intra Pulse Code Modulation (IPCM) sample of the image, to the sequence parameter set.