基于直方图修改的卫星遥感图像无损隐藏传输

针对星上低速率数据的传输问题，提出了一种基于直方图修改技术的卫星遥感图像无损隐藏传输方法。该方法通过对星上高速率遥感图像相邻像素差的直方图进行修改，将低速率数据嵌入到原始高速率遥感载体图像中，并利用卫星高速数传系统进行下传。地面接收端可以从载体图像中正确提取低速率数据，并无损恢复原始高速率遥感图像数据。该方法在不增加卫星数传系统复杂度和信息传输速率的前提下，提高了卫星数传系统的利用率，增强了数据传输的隐蔽性。实验结果表明，本文算法在保证良好的不可见性的情况下，获得了较高的纯载荷嵌入容量。与其它无损嵌入方法相比，在峰值信噪比和纯载荷嵌入容量方面都有很大的优势。

A Lossless Data Hiding Transmission Method for Satellite Remote Sensing Image Based on Histogram Modification

A lossless data hiding transmission method for satellite remote sensing image based on histogram modification is proposed in this paper for lower rate data transmission on board. The proposed scheme modifies adjacent pixel difference histogram of high rate remote sensing image. Then lower rate data are embeded into original cover remote sensing image. Finally, the stego image is transmitted to earth station by a satellite data transmission system. The original cover image can be recovered without any distortion after the hidden data have been extracted correctly at a terrestrial station. With this scheme, the
utilization rate of the satellite data transmission system is improved without increasing its complexity, and the concealment of data transmission is enhanced when the data transmission rate is kept unchanged at the same time. The experimental results show that the proposed scheme can achieve high pure payload embedding capacity while keeping the distortion low. Performance comparisons with other existing lossless data hiding schemes are provided to demonstrate the superiority of the proposed scheme in peak signal to noise ratio (PSNR) and the embedding capacity.