Patent ID: 9621924
Date: 2017-04-11
CPC Classifications: G06T,H04N

Claim:
1. A method for generating or decoding a bitstream representing a 3D model, comprising: accessing a reconstructed instance corresponding to an instance associated with a pattern, the pattern representative of a plurality of repetitive structures in the 3D model, and the instance being one of the plurality of repetitive structures and represented as a transformation of the pattern; accessing a first quantization parameter used for quantizing a rotation part of the transformation, wherein the reconstructed instance is determined in response to the pattern and the first quantization parameter; estimating an upper bound of a vertex coordinate error between a vertex of the instance and a corresponding vertex of the reconstructed instance, in response to at least one of (1) the first quantization parameter and (2) a distance between the corresponding vertex of the reconstructed instance and a rotation center of the reconstructed instance; determining a second quantization parameter for quantizing the vertex coordinate error in response to the estimated upper bound; and performing encoding or decoding of the vertex coordinate error between the vertex of the instance and the corresponding vertex of the reconstructed instance based on the second quantization parameter.