The paper investigates the novel concept of local-error control in mesh geometry encoding. In contrast to traditional mesh-coding systems that use the mean-square error as target distortion metric, this paper proposes...
详细信息
The paper investigates the novel concept of local-error control in mesh geometry encoding. In contrast to traditional mesh-coding systems that use the mean-square error as target distortion metric, this paper proposes a new l-infinite mesh-coding approach, for which the target distortion metric is the l-infinite distortion. In this context, a novel wavelet-based l-infinite-constrained coding approach for meshes is proposed, which ensures that the maximum error between the vertex positions in the original and decoded meshes is lower than a given upper bound. Furthermore, the proposed system achieves scalability in l-infinite sense, that is, any decoding of the input stream will correspond to a perfectly predictable l-infinite distortion upper bound. An instantiation of the proposed l-infinite-coding approach is demonstrated for MESHGRID, which is a scalable 3D object encoding system, part of MPEG-4 AFX. In this context, the advantages of scalable l-infinite coding over l-2-oriented coding are experimentally demonstrated. One concludes that the proposed l-infinite mesh-coding approach guarantees an upper bound on the local error in the decoded mesh, it enables a fast real-time implementation of the rate allocation, and it preserves all the scalability features and animation capabilities of the employed scalable mesh codec.
暂无评论