Mesh decoding device, mesh encoding device, mesh decoding method, and program

A mesh decoding method comprising:

• decoding a base mesh bit stream and generating and outputting a base mesh;
• performing inverse quantization on a quantized intra prediction residual and outputting an intra prediction residual;
• predicting a displacement of a subdivided vertex based on the base mesh output in the decoding and calculating an intra prediction value;
• and
• decoding the displacement by adding the intra prediction residual output in the performing and the intra prediction value calculated in the predicting.

A program stored on a non-transitory computer-readable medium for causing a computer to function as a mesh decoding device, wherein

• the mesh decoding device includes a circuit that:
• outputs a base mesh,
• outputs an intra prediction residual, and
• decodes a displacement by performing intra prediction of a displacement of a subdivided vertex based on the outputted base mesh to calculate an intra prediction value, and adding the calculated intra prediction value and the outputted intra prediction residual.