基于自适应块参照值的密文域可逆信息隐藏

Adaptive Pixel Block Reference Value Based Reversible Data Hiding in Encrypted Domain

针对当前密文域图像可逆信息隐藏容量不足,可逆性不强且实现复杂、效率低下的问题,提出一种基于自适应的块参照值的密文域可逆信息隐藏技术。该技术对图像按照四叉树分割的方式进行自适应分块,对部分图像块求取均值并保留,利用伪随机序列加密图像,并通过加法运算嵌入秘密信息。利用保留的均值可独立进行秘密信息的提取和图像解密,载体图像可完全恢复。实验表明,该方法简单、高效且计算简便,具有较好的隐藏容量、可逆性和可分离性。

Aiming at the problems that the capacity of reversible data hiding in encrypted domain is not enough,the existing algorithms are not reversible,inefficient and complex,a simple and efficient technique based on pixel block reference was proposed.The scheme divides the image adaptively in the way of quadtree,partial image block mean values are obtained and retained,the pseudo-random sequence is used to encrypt image,the secret information is embedded through addition operation.The secret information can be extracted independently,the image decrypted can be carried out independently,and the carrier image can be completely restored.Experiments show that the method is simple,efficient,easy to calculate,and it has good hidden capacity,reversibility and separability.