一种基于三维模型冗余贴图的信息隐藏技术

针对传统三维模型信息隐藏技术鲁棒性不强的缺点，提出了一种基于三维模型冗余贴图的信息隐藏算法。首先，对正交投影纹理映射规则进行面片贴图的可行性进行验证；其次，构造带有表面颜色属性的四元数小波变换空间并选取传输的关键信息进行加密；最后，将隐秘消息嵌入鲁棒空间后生成含密obj模型，贴图纹理与状态信息保存至MTL文件中，以RSA编程手段进行含密模型文件加密处理。仿真实验表明，与不含表面贴图属性的三维模型水印以及隐写方法相比，该算法在特殊渲染环境下具备较强的抗攻击能力。

Information hiding algorithm based on redundant map of 3D model

Aiming at the shortcomings of the traditional 3D model information hiding technology, this paper proposed a novel algorithm based on OBJ 3D model redundant texture. First, it verified the feasibility of the texture mapping rule of the orthogonal projection to perform the patch map. Second, it constructed the model quaternion wavelet transform space with surface color attributes, and selected the key information to be transmitted for encryption. Last, it embedded the secret message into the robust transform space to generate the stego OBJ model, and saved the texture and state information into MTL. Additionally, it performed the encrypted model file encryption process by RSA programming means. Simulation experiments show that the proposed algorithm has strong anti-attack capability in special rendering environment compared with 3D model watermarking and steganography without surface mapping properties.