计算机科学 ›› 2020, Vol. 47 ›› Issue (7): 328-334.doi: 10.11896/jsjkx.190800021
• 信息安全 • 上一篇
任帅1, 王萌1, 范傲雄1, 高泽1, 徐解1, Shahzad KHURRAM1, 张弢2
REN Shuai1, WANG Meng1, FAN Ao-xiong1, GAO Ze1, XU Jie1, Shahzad KHURRAM1, ZHANG Tao2
摘要: 针对目前3D网格模型信息隐藏算法抗分析性弱的问题,提出一种零高分辨率的信息隐藏算法。首先,利用改进半边折叠网格简化算法对网格模型进行多分辨率分析,将3个分辨率层表示为High-layer,Mid-layer,Low-layer;其次,在High-layer进行同心球面分割,提取特征向量,在Mid-layer计算顶点突出度,确定嵌入信息的特征点;再次,通过将特征向量中特征值的最高位与Chebyshev置乱的加密信息建立联系以形成关联信息;最后,利用分段映射函数将关联信息嵌入到特征点球面坐标r值的DCT变换交流系数中。算法将高分辨率层的特征向量与置乱信息所构建的关联信息隐藏于能量小于15%中分辨率层的鲁棒特征点的仿射变换不变量中,有利于算法的不可见性、鲁棒性和抗分析性。采用一阶拉普拉斯平滑的隐写分析方法检测不到点、面特征的明显变化,表明所提算法的抗分析性好。
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