利用内切球解析的三维模型信息隐藏算法

Information hiding scheme for 3D models based on skeleton and inscribed sphere analysis

针对三维模型信息隐藏算法鲁棒性差和容量低的现状,利用骨架理论和内切球解析技术提出一种基于三维模型载体空间和能量特性预处理的信息隐藏算法.该算法利用骨架定义,以各骨架点为球心,对模型进行欧氏内切球解析,并以各个骨架点的最小内切球解析次数为信息隐藏的修改量用于隐藏秘密信息.载体预处理过程不涉及顶点数量及坐标的改变和拓扑关系的修改,使得算法不可见性良好.实验结果表明,算法对抗旋转攻击有效率高达100%,对其他常见攻击也具有良好的鲁棒性,且不可见性良好,容量较大.

An information hiding scheme based on skeleton theory and inscribed sphere analysis for 3D models is proposed to improve the robustness and capacity of the existing algorithms. According to the definition of the skeleton, the model is analyzed by the Euclidean inscribed sphere analysis theory with each skeleton point as the center of the sphere. The number of times of minimum inscribed sphere analysis of skeleton points is considered as the modification for secret information. Preprocessing of carriers is unrelated with the number of vertexes, the change of coordinates and topology modification, so visual changes of carriers due to secret information embedding can be minimized. Experimental results show that this scheme is of strong robustness and good imperceptivity. Especially robustness against rotation is up to 100%, robustness against other common attacks is strong, and the capacity is larger.