基于块容量标签的密文图像可逆数据隐藏方法

密文图像的可逆数据隐藏技术既能保证载体内容不被泄露，又能传递附加信息。本文提出了一种基于块容量标签(block capacity label, BCL)的高容量密文图像可逆数据隐藏算法。该方案在图像加密之前进行预处理，首先将图像分为两个区域：参考像素区域和预测像素区域。然后将预测像素区域分为不重叠的块，根据所提出的算法确定分块的BCL,在对图像进行加密之后嵌入BCL,生成加密图像；在秘密数据嵌入阶段，根据BCL和数据隐藏密钥嵌入秘密数据。实验测试了BOWS-2数据集，平均嵌入容量为3.806 8 bpp,与现有方法相比，该方法可以获得更高的秘密数据嵌入容量，并可以实现原始图像的完美重建。

Reversible data hiding in encrypted images based on block capacity label

The reversible data hiding technology of encrypted images can not only ensure that the content of the carrier is not leaked,but also transmit additional information.This paper proposes a high-capacity reversible data hiding algorithm for encrypted images based on block capacity labels (BCL).This scheme preprocesses the image before encrypting it.The image is first divided into two regions:the reference pixel region and the predicted pixel region.Then the predicted pixel region is divided into non-overlapping blocks, and the BCL of the blocks is determined according to the proposed algorithm.The BCL is embedded after encrypting the image,and the encrypted image is generated.During the data embedding stage,the secret data is embedded according to the BCL and the data hiding key.Experiments are tested on the BOWS-2 dataset with an average embedding capacity of 3.806 8 bpp.Compared with existing methods,this method can obtain higher embedding capacity and can achieve perfect reconstruction of the original image.