Image decoding apparatus, image decoding method, image coding apparatus, and image coding method

Abstract

An image decoding apparatus () capable of appropriately executing parallel decoding processing by a simple structure includes: a stream segmentation control unit () that designates a processing target area, and selects a portion of a segment stream based on a position of the processing target area; M stream segmentation units () that generate M×N segment streams by executing stream segmentation processing on designated M processing target areas in parallel; and N decoding engines () that decode respective portions of the N segment streams including the selected portion in parallel. In the case where a slice included in the processing target area is segmented into a plurality of slice portions and assigned to a plurality of segment streams, each stream segmentation unit () reconstructs, for each segment stream, a slice portion group made up of one or more slice portions assigned to the segment stream, as a new slice.