基于编码压缩和加密的图像可逆信息隐藏算法

Reversible data hiding algorithm for images based on encoding compression and encryption

提出一种编码压缩和加密的图像可逆信息隐藏算法。计算载体像素预测值与其像素值的差值,对差值进行哈夫曼编码压缩,通过压缩数据和随机数据加密重构图像,得到载体数据。将哈夫曼编码的码表和秘密信息隐藏在载体数据中,实现信息隐藏。在载密数据中提取码表数据和秘密信息,对加密压缩数据进行解密,结合码表和预测方法恢复原始图像。实验结果表明,本文算法具有较大的隐藏容量,不仅能正确提取秘密信息,还能无损恢复原始图像。

This paper proposes a reversible data hiding algorithm for images based on encoding compres- sion and encryptioru The errors between pixel values and their prediction values are first calculated, and then compressed with Huffman coding to obtain the compressed data and Huffman table. The com- pressed data and random data are encrypted to reconstruct an image for cover data. The Huffman table and secret information are embedded into the cover data so as to achieve data hiding. The Huffman table and secret information can be extracted from the stego data. The compressed data is decrypted, the Huff- man table and prediction method are combined for recovering the original image. The experimental re- sults demonstrate the proposed method has high capacity. It not only can extract secret data accurately, but also recovers the original image without error.