摘要
针对数字图像中的水印生成问题,提出了一种基于激光的菲涅耳衍射效应结合离散余弦变换(DCT)的数字水印生成技术。该技术将水印图像进行菲涅耳变换得到数字全息图,再对全息图进行DCT变换得到水印处理结果,最后将水印处理结果嵌入到数字图像中特定位置。入射波长、衍射距离、嵌入位置等都可作为密钥,具有更高的安全性。仿真结果表明该技术能够实现水印嵌入和提取的目的,并且具有较强的鲁棒性。
Focus on the problem of generating watermark in digital image,proposed a new digital watermark method based on Fresnel diffraction and discrete cosine transform( DCT). Firstly the digital hologram is obtained by Fresnel diffraction of watermark image. Secondly processing result is obtained by DCT. Finally the processing result is embedded into digital image's specific location. The technique has higher security by using wavelength,diffraction distance and embedding position as a key. The simulation result shows that the technology realized the purpose of watermark embedding and extraction,and has strong robustness.
出处
《激光杂志》
北大核心
2015年第6期111-113,共3页
Laser Journal
关键词
菲涅耳变换
离散余弦变换
数字水印
鲁棒性
Fresnel diffraction
Discrete cosine transform
Digital watermark
Robustness
