IMAGE DECODING DEVICE, IMAGE ENCODING DEVICE, AND METHOD THEREOF

摘要

In the present invention, a reversible decoding unit (52) extracts, from stream information, difference information indicating the difference with respect to a predicted quantization parameter selected from selection candidates, the selection candidates being quantization parameters of a decoded block spatially or temporally adjacent to a block to be decoded. A quantization parameter calculation unit (59) calculates a quantization parameter of the block to be decoded from the difference information and the predicted quantization parameter. As a result, it is possible to correctly decode an image by calculating a quantization parameter equivalent to the quantization parameter used during image encoding.