| 利用通道间相关性的CFA图像盲取证 |
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| 引用本文： | 张晓琳,方针,张新鹏.利用通道间相关性的CFA图像盲取证[J].应用科学学报,2015,33(1):87-94. |
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| 作者姓名： | 张晓琳 方针 张新鹏 |
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| 作者单位： | 上海大学通信与信息工程学院，上海200444 |
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| 基金项目： | 国家自然科学基金（No.61472235）；教育部博士点基金（No.20113108110010）；上海市浦江人才计划基
金（No.13PJ1403200）；上海市东方学者专项 |
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| 摘 要： | 数码相机大多采用单传感器通过颜色滤波阵列（color filter array, CFA）插值获取彩色图像. 为此, 利用通道间CFA 插值引入的频谱相关性鉴别图像真实性. 分析插值图像与自然图像的频谱差异，基于绿-红分量频谱差的高频区域提取取证特征；对待鉴定图像重新插值，根据重插值前后的取证特征变化检测图像篡改. 实验结果表明，该方法可以定位图像篡改且对JPEG 压缩有较强的鲁棒性.
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| 关 键 词： | 篡改检测 图像取证 CFA插值 通道间相关性 |
| 收稿时间： | 2014-12-02 |
| 修稿时间： | 2014-12-29 |
Forgery Detection via Inter-channel Correlation of CFA Images |
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| ZHANG Xiao-lin,FANG Zhen,ZHANG Xin-peng.Forgery Detection via Inter-channel Correlation of CFA Images[J].Journal of Applied Sciences,2015,33(1):87-94. |
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| Authors: | ZHANG Xiao-lin FANG Zhen ZHANG Xin-peng |
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| Institution: | School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China |
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| Abstract: | Most digital cameras use a single sensor to capture only one component among the three colors (RGB) for each pixel, together with a color filter array (CFA) interpolating the other two after data acquisition. In this work, spectral correlation introduced by inter-channel CFA interpolation is exploited to realize image authentication. By analyzing differences in the frequency spectrum between inter-channel interpolated images and the natural ones, we extract forensics features from the high frequency areas of the green-red spectral difference. After re-interpolating the test image, we detect tampered images according to changes in the forensic features. Experimental results demonstrate effectiveness in forgery detection and robustness to JPEG compression. |
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| Keywords: | forgery detection image forensics CFA interpolation inter-channel correlation |
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