摘要
JPEG(joint photographic experts group)是日常生活中运用最为广泛的图像压缩格式,利用可逆信息隐藏(reversible data hiding,RDH)技术对其真实性和完整性进行认证,具有非常重要的意义.提出一种新的基于JPEG图像的可逆信息隐藏方法.该算法首先根据幅值大小,对JPEG图像8´8子块中小的非零AC(alternating current)系数进行两两配对,并在此基础上设计了一种新的二维可逆映射规则以嵌入信息,而大的非零AC系数用于移位以腾出空间.同时,为了进一步减少AC系数的无效移动,还提出了一种新的自适应频率选择策略,在每个子块中自适应选择不同频段的系数用于嵌入信息.实验结果表明:该方法在视觉质量和文件储存大小增长两个指标上,均优于目前最先进的方法.
Joint photographic experts group(JPEG) is the most widely used image compression format in daily life. Using reversible data hiding (RDH) technology to authenticate its facticity and integrity is of great significance. This study proposes a new RDH method based on JPEG image. In the proposed algorithm, the small non-zero alternating current (AC) coefficientsin each 8×8 sub-block of the JPEG image are paired according to their amplitudes, and a new two-dimensional reversible mapping rule is designed for these paired AC coefficients to embed information, where the rest large non-zero AC coefficients are used for shifting to make room. Moreover, in order to further reduce the ineffective shifts of AC coefficients, a new adaptive frequency selection strategy is also proposed. In each sub-block,the coefficients belonging to different frequency bands are adaptively selected in the embedding process. The experimental results show that the proposed method is superior to the most advanced methods in terms of the visual quality and increase of file storage size.
作者
吴桃宇
黄方军
WU Tao-Yu;HUANG Fang-Jun(School of Computer Science and Engineering,Sun Yat-sen University,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Information Security Technology,Guangzhou 510006,China)
出处
《软件学报》
EI
CSCD
北大核心
2022年第2期725-737,共13页
Journal of Software
基金
国家自然科学基金(62072481,61772572)。
