针对可逆数据隐藏中图像质量和嵌入容量之间相互矛盾的问题, 提出一种中心折叠技术与最低有效位替换相结合的可逆数据隐藏方法。该方法首先对原始图像中的像素进行位平面划分, 以得到2个位平面; 然后利用中心折叠技术将秘密数据折叠, 并将折叠后的秘密数据嵌入到原始像素的最高有效位中, 以生成2个隐秘像素; 最后利用最低有效位替换将秘密数据嵌入到隐秘像素的最低有效位中, 以进一步提高嵌入容量。实验结果表明, 利用中心折叠技术与最低有效位替换来嵌入秘密数据, 嵌入容量达到了1 572 778位, 有效地提高了嵌入容量; 当嵌入容量相同时, 与嵌入秘密数据后的相关算法相比, 图像的PSNR提高了约2 dB, 降低了图像失真, 具有更好的不可感知性。

Aiming at the contradictory problem between image quality and embedding capacity in reversible data hiding, a reversible data hiding method combining central folding technology with minimum effective bit replacement is proposed. Firstly, the pixel in the original image is divided into two bit planes. Then the secret data is folded by using the central folding technology, and the folded secret data is embedded into the highest effective bit of the original pixel to generate two hidden pixels. Finally, the secret data is embedded into the minimum effective bit of the hidden pixel with the least effective bit replacement to further improve the embedding capacity. The experimental results show that the embedding capacity is up to 1,572,778 bits by using the central folding technique and the minimum effective bit replacement to embed the secret data. When the embedding capacity is at the same time, compared with the relevant algorithms after embedding secret data, the PSNR of the image improves by about 2 dB, the image distortion is reduced, and has better imperceptibility.