Picture coding device, picture coding method, picture coding program, picture decoding device, picture decoding method, and picture decoding program

摘要

There is provided a picture coding device that performs intra prediction coding of a picture signal including a luma signal and a chroma signal in units of blocks and codes information relating to an intra prediction mode. When the intra prediction of a picture signal is made in units of coding blocks, in a case where a chroma format is 4:2:2, in a mode for setting a chroma intra prediction mode in accordance with the luma intra prediction mode, an intra prediction unit sets the chroma intra prediction mode based on the luma intra prediction mode and the chroma format and makes an intra prediction of the chroma signal.

主权项

1. A picture coding device that performs intra prediction coding of a picture signal including a luma signal and a chroma signal in units of blocks and codes information relating to an intra prediction mode, the picture coding device comprising:
a luma intra prediction mode derivation unit that is configured to derive a value of a luma intra prediction mode; and an intra prediction mode derivation unit that is configured to derive a value of a chroma intra prediction mode from a conversion table representing a value of the chroma intra prediction mode having a chroma format of 4:2:2 based on a value of the luma intra prediction mode of a prediction block located at a same position as the position of a prediction block of the chroma signal, which is derived by the luma intra prediction mode derivation unit, in a case where the chroma format is 4:2:2 and derive a value of the chroma intra prediction mode based on a value of the luma intra prediction mode of a prediction block located at a same position as the position of a prediction block of the chroma signal without using the conversion table in a case where the chroma format is not 4:2:2.