Concepts for image / video data streams that enable efficient reduction or efficient random access

摘要

PROBLEM TO BE SOLVED: To provide a decoder and a decoding method including a displacement device for displace each of a sub-region of a decoded image according to displacement information included in a data stream. A decoder contains displacement information in a data stream for each of a decoding core 234 that reconstructs an image from a data stream 200 and a set of at least one predetermined sub-region of the image in the region of the target image. Therefore, by displacing, the target image is synthesized based on the image, and the data stream includes a portion of the target image region that does not have at least one set of predetermined subregions of the image displaced according to the displacement information. A displacement device 236 for filling according to default filling information is provided. [Selection diagram] FIG. 21.