A Tailored Anti-Forensic Approach for Bitmap Compression in Medical Images
Shanmuganathan Manimurugan · IOSR Journal of Computer Engineering · 2012
Medical imaging is the technique and process used to create images of the human body for clinical purposes or medical science.Image processing has now become a significant component in almost all the areas.But storing medical images in a safe and sound way has become very complicated.Processing of such images should be carried out without knowledge of past processing on that image.Even though many image tampering detection techniques are available, the number of image forgeries is increasing.In this paper, a new approach is designed to prevent the medical image compression history.Then it also explains how this can be used to perform unnoticeable forgeries on the medical images.It can be done by the estimation, examination and alteration in the transform coefficients of image.The existing methods for identification of compression history are JPEG detection and Quantizer estimation.The JPEG detection is used to find whether the image has been previously compressed.But the proposed method indicates that proper addition of noise to an image's transform coefficients can adequately eliminate quantization artifacts which act as indicators of JPEG compression.Using the proposed technique the modified image will appear to have never been compressed.Therefore this technique can be used to cover the history of operations performed on the image and there by rendering several forms of image tampering.