基于像素对匹配的大容量SAR数据信息隐藏算法  

An Algorithm of High Capacity Information Hiding Based on Pixel Pair Matching for SAR Raw Data

作　　者：刘娟妮[1] 周诠[1] 

机构地区：[1]西安空间无线电技术研究所空间微波技术国家级重点实验室,西安710100

出　　处：《空军工程大学学报（自然科学版）》2015年第4期70-73,共4页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61372175);国家重点实验室基金资助项目(9140C530403130C53192)

摘　　要：针对SAR数据提出一种参考秘密信息内容对载体像素对匹配的大容量信息隐藏方法。该方法利用提取函数将SAR数据实部和虚部的不同组合结果映射为一位n2进制信息,并通过不同组合结果的优选使含密SAR数据与原载体数据的MSE最小,保证SAR原始数据成像质量几乎不受影响。实验对比结果证明:与同类隐藏方法相比,在信息嵌入量相同时,该隐藏算法PSNR平均提高0.7dB,且像素对组合模式可以作为密钥用于接收端信息提取,利用载体的不同组合方法可以有效提高算法的安全性。Aimed at SAR raw data, this paper proposes a high capacity information hiding algorithm based on pixel pair matching conducted according to the secret data. By using an extraction function, different combination of SAR real part and imaginary part are mapped into a secret digit in an n^2-ary notation system, and the optimal combination is chosen for a data block with the smallest MSE. Thus, the distortion caused by information hiding can be ignored for SAR imaging. Compared with the other similar algo-rithms, the PSNR of the proposed method increases 0.7 dB on average under condition of the same capaci- ty, and high security is achieved with the help of various combinations.

关 键 词：信息隐藏 合成孔径雷达 像素对匹配 隐藏容量 

分 类 号：TN957.52[电子电信—信号与信息处理]