指数矩耦合局部敏感哈希的图像伪造检测算法
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国家教育部博士点基金项目资助(2012110111003);北京市科技支撑项目资助(BJ20159923)

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Image forgery detection algorithm based on exponential moments and locally sensitive Hash
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    摘要:

    为了解决图像伪造检测算法在定位篡改内容时忽略了不同颜色分量之间的关系,使其对图像特征描述不足,导致其识别结果中存在误检与漏检等情况,本文提出了基于多元指数矩与欧式局部敏感哈希的图像伪造检测算法。引入高斯低通滤波,消除可疑图像中的噪声;随后,将滤波图像分割为一系列的重叠圆形子块,改善其对旋转等内容操作的鲁棒性;基于四元指数矩(QEM),计算每个圆形子块的QEM,以提取相应的鲁棒特征,将其组合成特征矢量;采用欧式局部敏感哈希机制,生成每个子块对应的哈希序列;计算任意两个相邻哈希元素之间的空间距离,通过与预设阈值比较,完成所有子块的匹配;最后,借助随机样本一致性方法来剔除错误匹配,通过形态学处理,定位出篡改内容。实验数据显示:较已有的伪造检测方法而言,在各种几何内容修改下,所提算法具有更高的伪造检测准确性。

    Abstract:

    In order to solve the problems like false detection and missing detection in the recognition results due to ignoring the relationship between different color components when using the image forgery detection algorithm to locate tampered content, the image forgery detection algorithm based on multivariate exponential moments and Euclidean locally sensitive Hash is proposed. The Gaussian low-pass filtering is introduced to eliminate the noise in suspicious images. Subsequently, the filtered image is segmented into a series of overlapping circular sub-blocks for improving its robustness to rotation and other content operations. Based on the Quaternion Exponential Moment(QEM), each circular sub-block is computed to extract the corresponding robust features and combine them into feature vectors. The corresponding Hash sequence of each sub-block is generated by the Euclidean locally sensitive hashing mechanism. The spatial distance between any two adjacent Hash elements is computed, and the matching of all sub-blocks is finished by comparing with the preset threshold. Finally, by means of the consistency method of random samples, the false matching is eliminated, and the tampered content is located by morphological processing. The experimental results show that compared with the existing forgery detection methods, the proposed algorithm has higher accuracy of forgery detection under various geometric modifications.

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李建军,吴文亮,张福泉.指数矩耦合局部敏感哈希的图像伪造检测算法[J].太赫兹科学与电子信息学报,2020,18(4):679~686

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  • 收稿日期:2019-08-22
  • 最后修改日期:2019-11-14
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  • 在线发布日期: 2020-09-02
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