为了在图像中实现无损信息隐藏,并提高数据嵌入容量和隐蔽性,给出一种基于改进整数变换的无损信息隐藏方法。首先对图像块采用改进算法进行整数变换,使得变换前后图像块引入失真较少，然后自适应选择整数变换后引入失真较小的可修改图像块进行整数变换,并嵌入较大数据量的机密信息，在公共信道进行传输后接收端能正确提取机密信息,并无损恢复原宿主图像。实验结果表明,该方法具有较大的数据嵌入容量和较好的隐蔽性,可用于医学图像中隐藏病历信息及遥感、军事图像的无损隐秘传输等领域。

In order to realize reversible data hiding in image as well as improve embedding capacity and secrecy, a reversible data hiding method based on modified integer linear transform is proposed. Large capacity secret information can be embedded adaptively in the translated image blocks with less distortion, which is transformed by the modified integer transform introducing less distortion. After transmitted in open channels, the hidden data can be extracted correctly and the host image can be lossless recovered from the marked image. The experimental results show that the proposed method has larger embedding capacity and better secrecy. It can be applied to hiding case history in medical images and also can be used for lossless covert communication in remote sensing images, military images and etc.