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基于量化调制与像素块添加的二值工程图抗打印扫描水印算法
彭飞,颜臻杰,龙敏
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(湖南大学信息科学与工程学院 长沙中国 410082;长沙理工大学计算机与通信工程学院 长沙中国 410014)
摘要:
针对已有二值工程图抗打印扫描方法需要图像校正且不可见性较差的不足,本文提出了一种基于量化调制与像素块添加的二值工程图抗打印扫描水印算法。本方法首先识别出图中线段边缘部分作为水印嵌入区域,然后将水印序列进行分组,对每组水印序列根据其组号在水印嵌入区域添加参考点,再计算出量化区间,通过在量化区间相应位置添加像素块的方式嵌入水印。水印提取则可通过识别水印点直接进行,无需对图形进行校正还原。实验结果表明本算法能够抵抗打印扫描以及复印攻击,且水印容量大,不可感知性好,具有较好的应用前景。
关键词:  二值工程图  抗打印扫描  线段识别  量化调制
DOI:10.19363/J.cnki.cn10-1380/tn.2018.11.06
投稿时间:2018-08-11修订日期:2018-09-13
基金项目:本课题得到国家自然科学基金(No.61572182,No.61370225)、湖南省自然科学基金(No.15JJ2007)资助。
Print-Scan Resilient Watermarking For Binary Engineering Graphics Based on Quantization Modulation and Pixel Block Addition
PENG Fei,YAN Zhenjie,LONG Min
School of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China;School of Computer and Communication Engineering, Changsha University of Science and Technology, Changsha 410014, China
Abstract:
Aiming at the defects in imperceptibility and requirement of image calibration of the existing print-scan resilient watermarking for binary engineering graphics, a novel scheme based on quantization modulation and pixel block addition is proposed in this paper. The line segment in the image is first identified as the watermark embedding area, and the watermark sequence is divided into groups. Secondly, for every watermark group, a reference pixel point is added to the watermark embedding area, and then the quantization intervals are calculated. Finally, the watermark is embedded by adding pixel blocks at the corresponding position in the quantization intervals. The watermark can be directly extracted by identifying watermark pixels and no image calibration is needed. Experimental results and analysis that it can effectively resist print-scan and photocopy attack, and it has large capacity and good imperceptibility. It has great potential to be applied for security protection of binary engineering graphics.
Key words:  binary engineering graphics  print-scan resilience  line segment identification  quantization modulation