Abstract: The LMDC（Layered Multiple Description Coding） method for 3D mesh proposed combines the advantages of both layered and multiple description coding.The mesh is decomposed to derive a base mesh and the reconstruction information.Adopting the idea of layered coding，the base mesh is encoded as the base layer and the reconstruction information as the enhance layer.The MDC method based on vertex spanning tree is used to ensure that the clients can receive an acceptable base mesh.By using LMDC，it is more appropriate to the current network of real-time mesh transmission and the pursuit of higher quality.The simulations have proved that the method can get a high compression ratio and can still restore an acceptable mesh in the case of packet loss.

摘要： 结合分层编码与多描述编码的优势，提出三维网格分层多描述编码（LMDC）方法：先对3D网格进行几何分解，得到一个粗糙网格和细化网格所需的连通性信息，采用分层编码思想，粗糙网格作为基本层，而将细化信息作为增强层。同时采用基于顶点分裂树的多描述编码方法对基本层加以保护，保证基本层在差错信道中的有效传输。采用分层多描述编码对3D模型进行编码的方法，非常适合于带宽受限和多路径传输的异构网络。实验证明，该方法能获得较高的压缩率，并在有丢包的情况下能有效地保护并恢复出可接受的基本层网格。