A Forensic Method for Detecting Image Forgery Using Codebook

1, 2 Department of Computer Science and Engineering 3 Department of Information Technology Mepco Schlenk Engineering College, Sivakasi Affiliated to Anna University, Chennai, India Abstract—An Extensive growth in software technologies available on Internet results in tampering of images. The main problem in the real world is to determine whether an image is real or forged. In this paper we propose a new method that makes use of the codebook which is generated from the set of image features to determine the geometric manipulations that are occurred in the received image. In the proposed method, an image hash based on bag of visual words attached as signature to the image before transmission. At the destination the forensic hash is compared to detect the geometric manipulations that are applied to the received image. The spatial distribution of image features is encoded to deal with highly textured and contrasted tampering patterns. The proposed method detects all types of tampering. Keywords—Bag of Words, Code book, Forensic Hash, Geometric manipulations, Image tampering.