Unified wedgelet genenration for depth coding in 3D-HEVC

In 3D-HEVC, bi-partition based modes, i.e., depth modeling modes (DMM), are applied for depth intra coding. With DMM, a depth prediction unit (PU) is partitioned into two parts using a Wedgelet pattern selected from a predefined large Wedgelet set, and the Wedgelet set is generated during both encoder and decoder initialization for each block size ranging from 4 ×4 to 32×32. The generation of Wedgelet sets involves relatively high complexity in terms of both storage and computation, especially for large block sizes. To simplify the Wedgelet generation, in this paper, we propose a unified Wedgelet generation method which derives large Wedgelet patterns by extending the primitive 4×4 Wedgelet pattern along its partition boundary line, and the storage of large Wedgelet patterns can be saved. Experimental results show almost no coding efficiency degradation using the proposed method, and the complexity of Wedgelet generation process is largely reduced in a unified manner.