中圖分類號： TP309.7
文獻標識碼： A
DOI： 10.19358/j.issn.2096-5133.2020.09.007
引用格式： 趙文鵬，李子臣，游福成，等. 直方圖移位安全可逆圖像水印算法的研究[J].信息技術與網絡安全，2020，39(9)：34-38.

Research on histogram shift safe reversible image watermarking algorithm

Abstract： In the field of digital copyright protection and multimedia information security, the embedded watermark information needs to be encrypted to ensure the confidentiality of the watermark information, so a safe and reversible image watermarking algorithm for histogram shift is proposed. The maximum and minimum pixel values of the carrier image are subtracted one and added one respectively, and the pixel value is marked. The carrier image is preprocessed to solve the problem of overflow caused by pixel value modification when embedding watermark information. The watermark information is encrypted using ZUC sequence cipher. In the stage of watermark embedding, the predicted difference of four fields and eight fields of each half-plane pixel is calculated to construct a two-dimensional histogram, and then the encrypted watermark is embedded. Experimental results show that the algorithm can restore the original carrier image lossless, the encrypted watermark information can be decrypted correctly, and the peak signal-to-noise ration value of the encrypted watermark image reaches more than 50 dB. The experimental results further illustrate that the scheme has good encryption and decryption effects, the watermark image has good quality and watermark concealment, the algorithm is reversible, and solves the problem of pixel overflow.

Key words : encrypted watermark；prediction difference；histogram shifting；pixel overflow