Patent ID: 8891620

Claim:
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.