Copy-Move Forgery Detection and Localization by Means of Robust Clustering with J-Linkage

Copy-Move Forgery Detection and Localization by Means of Robust Clustering with J-Linkage” by I. Amerini, L. Ballan, A. Del Bimbo, L. Del Tongo and G. Serra  has been accepted for publication in the Signal Processing: Image Communication.

Understanding if a digital image is authentic or not, is a key purpose of image forensics. There are several dierent tampering attacks but, surely, one of the most common and immediate one is copy-move. A recent and eective approach for detecting copy-move forgeries is to use local visual features such as SIFT. In this kind of methods, SIFT matching is often followed by a clustering procedure to group keypoints that are spatially close. Often, this procedure could be unsatisfactory, in particular in those cases in which the copied patch contains pixels that are spatially very distant among them, and when the pasted area is near to the original source. In such cases, a better estimation of the cloned area is necessary in order to obtain an accurate forgery localization. In this paper a novel approach is presented for copy-move forgery detection and localization based on the J-Linkage algorithm, which performs a robust clustering in the space of the geometric transformation. Experimental results, carried out on dierent datasets, show that the proposed method outperforms other similar state-of-the-art techniques both in terms of copy-move forgery detection reliability and of precision in the manipulated patch localization.