JPEG is probably the most widely used image compression standard in taking digital pictures, e.g., in most digital cameras. As a result, synthetic images by the trick operation of copy-paste are usually from and to JPEG images. Realizing that it might be impossible to find a method that is universal for all kinds of forgeries, we proposed a novel blind approach to detect copy-paste trail in doctored JPEG images and meanwhile locate the doctored area. The approach works well even when a JPEG image is truncated or multi-compressed, by extract the DCT block artifact grid and detect mismatch of the grid. Experiments well demonstrate the effectiveness of the proposed approach.
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