摘要
为了解决数字图像的安全和版权问题,提出一种基于离散傅里叶变换的数字水印算法.首先将原图像按照水印图像的大小进行分块,并对每一块图像进行离散傅里叶变换;再对二值水印图像进行置乱,利用密钥产生水印图像大小的随机矩阵;最后,在每一块离散变换域幅度谱的中频区域嵌入水印信息.实验结果表明,所提算法具有良好的鲁棒性和不可见性,嵌入后对原图像的视觉质量没有太大影响,达到信息隐藏的目的.
In order to solve the security and copyright problems of digital images,a new digital watermarking algorithm is fut forward based on discrete Fourier transform.Firstly,the original image is divided into blocks according to the size of the watermark image,and each block is subjected to discrete Fourier transform.Secondly,the binary watermark image is scrambled and a random matrix of watermark image size is generated by using the key.Finally,watermark information is embedded in the intermediate frequency region of each discrete transform domain amplitude spectrum.The experimental results show that the algorithm has good robustness and invisibility.After embedding,it has little effect on the visual quality of the original image and achieves the purpose of information hiding.
作者
王树梅
张文斌
WANG Shumei;ZHANG Wenbin(School of Computer Science and Technology,Jiangsu Normal University,Xuzhou 221000,China)
出处
《湖南理工学院学报（自然科学版）》
CAS
2019年第3期17-22,共6页
Journal of Hunan Institute of Science and Technology(Natural Sciences)
基金
国家自然科学基金项目(61673196)
关键词
信息隐藏
傅里叶变换
数字图像
数字水印
information hiding
Fourier transformation
digital image
digital watermarking
