基于预测误差双重编码的大容量密文域可逆信息隐藏算法

针对目前密文域可逆信息隐藏算法嵌入容量较小的问题,提出了基于预测误差双重编码的大容量密文域可逆可分离信息隐藏算法。首先为了预留秘密信息的嵌入空间,图像拥有者利用基于预测误差的哈夫曼编码及扩展游程编码对图像进行预处理,然后加密图像;数据嵌入者在加密后的图像中嵌入秘密信息;接收者根据信息隐藏密钥可以准确无误地提取秘密信息,根据解密密钥可以无损恢复图像,两者无顺序要求。实验结果表明,预测误差双重编码的应用有效地提高了嵌入容量。

High-Capacity Reversible Data Hiding in Encrypted Images based on Prediction Error Dual Coding

In order to cope with the problem that reversible data hiding in encrypted images(RDHEI) has lower embedding capacity, this paper proposed a high-capacity RDHEI method based on prediction error dual coding. Firstly, to reserve space for secret data, the image owner preprocessed the image using prediction error-based Huffman coding and extended run-length coding, and then encrypted the image. The data hider embedded secret data in the encrypted image. The receiver could extract the secret data accurately according to the data hiding key and recover the image losslessly according to the decryption key, it separated data extraction and image decryption. The experimental results demonstrate that the embedding capacity is effectively improved by prediction error dual coding.