基于半色调技术的印前图像篡改检测方法

发布时间：2018-12-16 20:00

【摘要】：印前图像特指图像数字排版经编辑确认后的数字印刷样张,其以栅格处理器分色后的加网二进制形式存储.数字样张一经确认,其来源的合法性便不受怀疑.但是,从印刷的整体流程来看,数字样张的存储、传输过程中仍有较大的篡改风险.现有的复制移动篡改检测算法存在特征维度高、计算开销大或检测率较低等问题,而且不适用于分色后的二进制样张.提出了一种基于半色调图像网点密度特征的Copy-Move篡改检测方法,该方法对分色处理后的CMYK目标图像进行半色调二值量化处理,采用滑动分块的方法对目标图像进行分块,通过提取图像块CMYK这4个通道的局部网点密度特征对图像块进行篡改检测.实验结果表明,该方法在图像篡改检测上与以往方法相比具有较低的时间复杂度和较高的检测率,并且对图像篡改区域的旋转攻击、小尺度缩放攻击等具有较好的鲁棒性.
[Abstract]:Prepress image refers to the digital printing sample sheet which is edited and confirmed by digital typesetting, which is stored in binary form of grid processor after color separation. Once the digital sample sheet is confirmed, the validity of its source is not questioned. However, from the overall process of printing, there is still a greater risk of tampering in the storage and transmission of digital samples. The existing duplicated mobile tamper detection algorithms have many problems such as high feature dimension, high computational overhead or low detection rate, and they are not suitable for binary samples after color separation. In this paper, a Copy-Move tamper detection method based on dot density of halftone image is proposed. The method performs halftone binary quantization on the CMYK target image after color separation, and blocks the target image by sliding block method. The image block is tampered with by extracting the local dot density characteristics of the four channels of image block CMYK. The experimental results show that the proposed method has lower time complexity and higher detection rate than the previous methods, and is robust to the rotation attack of image tamper region and the small-scale scaling attack.
【作者单位】：武汉大学印刷与包装系;中国摄影文化产业研究中心(武汉大学);湘潭大学信息工程学院;
【基金】：国家自然科学基金(61275172) 国家重点基础研究发展计划(973)(2012CB725302) 湖南省教育厅一般项目(15C1324)~~
【分类号】：TP309;TP391.41

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