Proposes a novel method for detecting copy-move forgery: the given image is divided into overlapping blocks of equal size, feature of each block is then extracted and represented as a vector. All the extracted feature vectors are then sorted using the radix sort. The difference (shift vector) of the positions of every pair of adjacent feature vectors in the sorting list is computed. The accumulated number of each of the shift vectors is evaluated. Finally, mathematical morphology is performed to obtain the final result.