A New Approach for Detecting Copy-Forged Images

This paper proposes a novel method based on LPP-SIFT(Locality Preserving Projection-Scale Invariant Feature Transform) for image copy-forgery detection.First,some steps of SIFT algorithm are used to extract key points;second,LPP is used to obtain low-dimensional feature descriptors,and then key points can be matched by the ratio of vector angel.If mass matching key points exist in a region,the region can be judged to have undergone copy-forged operation.Experiments demonstrate that the method can effectively detect forged images and locate the forged area,and this method is robust to rotation,scaling,JPEG compression and noise addition.