基于行小波编码的纹理隐藏三维地形数据算法

讨论利用纹理图像隐藏高程信息来保护三维地形数据的信息隐藏技术。首先提出了改进的基于行小波变换及其编码,在保持地形形状和起伏特征的前提下实现高程数据的极低比特率低存储压缩。通过研究可嵌入隐藏信息的小波系数集合生成方法并结合基于视觉系统(HVS)小波域量化噪声的视觉权重(JND)分析技术,提出了自适应确定信息嵌入强度的方法。由于隐藏过程采用分组密码Rijndael生成单向Hash函数,信息隐藏算法高度安全、可以公开。

Three-dimensional Landform Data with Texture Information Hiding Technique Via Line-based Wavelet Code(LBWC)

An information hiding technology is presented in this paper,in which the 3-D landform data is protected and the information of elevation is hidden in the texture.In keeping the terrain figure and hypsography, the terrain information is compressed in low bit ratio and least memory by using improved line-based code approach.A method to build the wavelet coefficient set which can be embedded into the hided information is provided.The strength of the embedding data is image-adaptive according to the wavelet quantization noise,achieving the maximum strength of Just Noticeable Distortion(JND) tolerance of Human Visual System(HVS).Since hiding process is accomplished by using Rijndael code to construct Hash one-way function,the proposed algorithm has very high safety and its arithmetic can be public.