摘要
针对基于DSP的数字水印防伪检测技术,数字水印图像对比精度低,抗几何失真效果差,无法满足数字水印防伪高精度检测要求的问题,提出激光散斑图像数字水印防伪检测技术。通过图像分割、离散余弦变换、数据提取、图像合并等过程在嵌入水印的载体图像内提取完整数字水印;利用激光散斑成像系统分别采集原数字水印与提取得到的数字水印的激光散斑图像,对比两张激光散斑图像中极值点位置,得到数字水印激光散斑图像实际位移量,对比实际位移量与设定的位移阈值,完成数字水印防伪检测。实验结果表明,所提技术能够对抗几何失真,数字水印提取性能高,在确保高防伪检测精度的同时,相对于对比检测技术的峰值信噪比提升5.43 dB,平均检测时间降低0.54 s。
Aiming at the problems of SDP-based digital watermark anti-counterfeiting detection technology,such as low contrast accuracy of digital watermark image,poor anti-geometric distortion effect and inability to meet the requirements of high-precision anti-counterfeiting detection of digital watermark,a laser speckle image anti-counterfeiting detection technology is proposed.A complete digital watermark is extracted from the carrier image embedded with watermark through image segmentation,discrete cosine transform,data extraction,image merging and other processes.The laser speckle imaging system is used to collect original digital watermark and the extracted digital watermark laser speckle images respectively.The positions of extreme value point in the two laser speckle images are compared.The actual displacement of digital watermark laser speckle images is obtained.The experimental results show that the proposed technology can resist geometric distortion,and the digital watermark extraction performance is high.While ensuring high anti-counterfeiting detection accuracy,the peak signal-to-noise ratio of the proposed technology is increased by 5.43 dB,and the average detection time is reduced by 0.54 s.
作者
刘勃宏
LIU Bohong(Xi'an University of Arts and Science,Shan Xi 710065,China)
出处
《激光杂志》
北大核心
2020年第4期106-110,共5页
Laser Journal
基金
陕西省教育科学“十三五”规划(No.SGH17V061)。
关键词
激光散斑图像
数字水印
防伪检测
提取
极值点
位移
laser speckle image
digital watermark
anti-counterfeiting detection
extraction
extreme value point
displacement
作者简介
刘勃宏(1979-),男,汉,硕士讲师。
