复制粘贴伪造图像鉴定检测图像中的疑似相似区域。传统的逐像素或逐块的鉴定方式耗时冗长。提出一种利用SIFT(尺度不变特征转换)特征的非对称搜索的复制粘贴伪造图像盲检测算法,算法利用图像SIFT特征初步定位复制粘贴伪造疑似区域,利用非对称特征搜索方式进行方向性的特征匹配,准确定位复制粘贴伪造区域。实验结果表明,本文算法能够准确检测复制粘贴伪造区域,检测结果不受高斯、椒盐等噪声的影响,检测效率比传统算法提高了1~2个数量级。

The identification of copy-paste forgery image is to find the suspicious region via pixel-by-pixel or block-by-block match, the computation costs is very heavy. An efficient blind forgery image detection approach based on scale-inva- riant feature transform (SIFT)is proposed in the paper, which employs SIFT keypoints for positioning the initial suspicious forgery region. The asymmetric search is exploited for refining the suspicious region and determining the forgery area. Experiments demonstrate that the proposed algorithm could significantly decrease the number of candidate search block, accurately identify the copy-paste forgery region regardless of the existence of gauss, salt and pepper noise, and the computational cost is reduced by 1~2 orders of magnitude with compare to the conventional methods.