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Proving Authenticity and Integrity of Digital Images using Image Forensics

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As JPEG is widespread de facto image format, Most of the images available in computer systems, electronic devices
and in the Web are in JPEG format hence forgery detection techniques in JPEG may explore most of the forgeries. Digital
images have a very significant role in various fields like medical imaging, journalism, criminal and forensic investigations. But
the easy availability of photo editing software and tools has made the process of verifying the authenticity and integrity of digital
images extremely difficult.
It is a common practice followed by forger to hide traces of resampling & splicing. However the tampered region usually has a
different JPEG compression history than the authentic region. It identifies forgery by searching ghost which appears in
resultant difference image after subtracting it from its various recompressed version at different quality levels. As number of
difference images become very large it becomes difficult for human being to scan these large no of difference image.
If these images were originally of different JPEG compression quality, then the digital composite may contain a trace of the
original compression qualities. Technique describes way to detect whether the part of an image was initially compressed at a
lower quality than the rest of the image.
Keywords: Compression, forgered image, Digital image forensics, image processing, distance method.

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