基于面元素重排的三维网格模型数据隐藏算法

目的 为了解决目前三维数据隐藏算法不能兼顾无失真和盲提取的问题，提出一种新的完全无失真的三维网格模型数据隐藏盲算法。方法 首先使用混沌逻辑映射选择嵌入与提取模式，保证数据的安全性。然后利用面元素重排，完全不会造成三维模型失真的性质，通过不同嵌入模式规则对三角面元素进行重排，以嵌入秘密数据。接收端则可根据相应的提取模式规则提取秘密数据。结果 仿真结果与分析表明，该算法不会对三维模型造成任何失真，嵌入容量为每顶点2比特，且能抵抗仿射变换攻击、噪声攻击和平滑攻击等。结论 这种三维数据隐藏盲算法无失真，容量大、安全性高、鲁棒性强，适用于三维载体不容修改的情形，如军事、医学、秘密通信和版权保护等。

Data Hiding Algorithm for 3D Mesh Model Based on Face Elements Rearrangement

The work aims to propose a new blind algorithm for data hiding of 3D mesh models with complete distortion-free to solve the problem that the current 3D data hiding cannot take into account both distortion-free and blind extraction. First, chaotic logical mapping was used to select embedding and extracting modes to ensure the security of data. Then, the face elements rearrangement that would not cause distortion of the 3D model was adopted. The secret data was embedded by rearranging the triangular face elements through different embedding mode rules. The receiver could extract the secret data according to the corresponding extraction mode rules. Simulation results and analysis indicated that the algorithm did not cause any distortion to the 3D model, the embedding capacity was two bits per vertex, and it could resist affine transformation attacks, noise attacks and smoothing attacks. This blind 3D data hiding algorithm has no distortion, large capacity, high security and strong robustness, and is suitable for situations where the 3D carrier cannot be modified, such as military, medical, secret communication and copyright protection.