IMAGE DECODING METHOD AND IMAGE DECODING APPARATUS

摘要

To provide a video coding technique to reduce the amount of code, a coding apparatus configured to code layers at a plurality of resolutions as a stream determines the coding unit, prediction unit, and frequency transform unit for each layer in compliance with given rules with reference to the coding unit, prediction unit, and frequency transform unit of the lower layer, respectively, and switches the given rules with a flag. This adaptively and efficiently compresses a video.

主权项

1. An image decoding method for decoding a coded stream obtained by coding a video and capable of decoding images at a plurality of resolutions by extracting a part of the coded stream, the method comprising:
decoding a division method of a unit CU for coding each layer; decoding a division method of a prediction unit PU; and decoding a division method of a frequency transform unit TU, wherein, in the decoding of CU of a layer 1, the CU division method is calculated with reference to a CU division method of another layer 0 and in compliance with a given rule, in the decoding of PU of a layer 1, the PU division method is calculated with reference to a CU division method of the same layer 1 and a PU division method of another layer 0, and in compliance with a given rule, in the decoding of TU of a layer 1, the TU division method is calculated with reference to a CU division method of the same layer 1 and a TU division method of another layer 0, and in compliance with a given rule, and the given rule is determined with a flag.