一种适用于遥感图像的可逆信息隐藏算法

A reversible data hiding scheme for remote sensing images

可逆信息隐藏技术,可用于实现遥感图像重要目标区域的无损传输。通过对现有可逆信息隐藏算法进行研究,发现现有算法的单次嵌入容量不足,且需要额外的无损二值压缩处理附加信息,无法满足遥感图像处理的有效性和实时性要求。借助给定门限对载体图像不重叠子块的平滑性进行划分,通过编码平滑子块内基准像素与其余像素之差,并结合比特替换,实现秘密信息的可逆隐藏。对于512×512像素的灰度遥感图像,单次嵌入容量可达5×10^5 bit以上。试验结果表明,该算法可实现单次高嵌入容量的可逆隐藏,并不需要任何额外无损二值压缩来处理辅助信息。

Reversible data hiding(RDH)can be used for lossless transmission of remote sensing images′important target region.Based on the study of existing RDH schemes,it was found that the capacity of single embedment was not sufficient and that the process of auxiliary information required additional lossless binary compression,which cannot meet the effectiveness and real-time requirement of remote sensing image process.The smoothness of non-overlapping sub-blocks in carrier image was detected with a given threshold.Then RDH was achieved by encoding the differences between the reference pixel and the rest pixels in a smooth block,along with bit substitution.Capacity of a single embedment of the proposed scheme can be more than 500000 bit for a 512×512 pixel gray-scale remote sensing image.Experimental results show that the proposed algorithm can achieve reversible data hiding with the efficient capacity of single embedment,and yet no additional lossless binary compression is required for auxiliary information processing.