HIERARCHICAL ARITHMETIC CODING OF DISPLACEMENTS FOR DYNAMIC MESH COMPRESSION

Dynamic meshes reasonably represent time-varying 3D objects, but compression is required due to the large amount of data. One compression framework decomposes a dynamic mesh into a base mesh and displacements by using decimation and subdivision. The displacements are converted to coefficients by wavelet transforms, quantized, and compressed by video codec, which is well disseminated. However, the abundance of tools in video codec is too complex for uncorrelated displacements. In this paper, we propose hierarchical arithmetic coding, dividing the coefficient levels into blocks and smaller subblocks. When all levels are zero in a block/subblock, a flag is coded instead of the levels. The experimental results show that the coding complexity was significantly reduced while the coding efficiency was maintained.