| 摘要: |
| 提出了一种高效、安全的数字高程模型(digital elevation mode,简称DEM)数据小波水印算法,以解决DEM数据版权保护和限制非法使用的问题.在理论上,基于提升理论构造了一种包含自由变量t的紧支撑小波,选取参数t=1的9/7整数小波基,只需要整数加法和移位实现,运算量低,便于硬件实现.提出可嵌入水印的小波系数集生成方法,扩展了基于视觉系统(HVS)小波域量化噪声的视觉权重(JND)分析方法,使其适用于DEM数据,并能够自适应地确定水印嵌入的强度.该算法在保证地形形状和起伏特征的前提下,提高了水印的鲁棒性.应用Rabin方法生成的单向Hash函数,水印算法可以完全公开. |
| 关键词: 数字高程模型 提升理论 带参数整数小波变换 数字水印 |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant No. 10171109 (国家自然科学基金); the Defense Pre-Research Project of the ‘Ninth Five-Year-Plan' of China (国家"九五"国防预研基金); the National Research Foundation for the Doctoral Program of Ministry of Education of China under Grant No.20049998006 (国家教育部博士点基金) |
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| Study on Digital Elevation Mode Data Watermark via Integer Wavelets |
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LUO Yong,CHENG Li-Zhi,CHEN Bo,WU Yi
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| Abstract: |
| In this paper an efficient approach via wavelet for digital watermark in DEM(digital elevation mode) data is developed, which effectly protects the copyright of DEM data and avoids the unauthoritative user. A technique based on lifting scheme is presented to construct the compactly supported wavelets whose coefficients are composed of a free variable. When t=1, the integer wavelets based on lifting scheme only use integral addition and shift, so it’s fast and easily realized via hardware. A method is presented to build the wavelet coefficient set which can embed watermark information. The bit is inserted in the high activity texture regions with the maximum strength of Just Noticeable Distortion (JND) tolerance of Human Visual System (HVS). Keeping the terrain figure and hypsography, the digital watermark is robust. A hash one-way is constructed by the Rabin method, and the digital watermark arithmetic can be public. |
| Key words: digital elevation mode lifting scheme integer wavelets with parameter digital watermark |
