关键词: 图像取证, 图像篡改, 复制粘贴伪造, 模糊不变矩

Abstract: In recent years, with the advent of all kinds of advanced image processing algorithms and the corresponding image processing hardware and software, digital image has become much easy to forge even for non-professional users, and the forged image is hard or even impossible to be distinguished from the original image by naked eyes. This paper concentrates on a specific category of digital image forgery known as copy-move forgery, and proposes a method to automatically detect and localize duplicated regions in digital images. An image is tiled with overlapping blocks and each block is characterized by blur invariants, which is calculated from blur moment invariants. It determines the image tamper regions in terms of predetermined similarity criteria. The experimental results show that the method has obvious advantage in anti-blur processing in contrast with the method based on PCA（Principal Component Analysis）.

Key words: image forensics, image tempering, copy-move forgery, blur moment invariants