Tamper Detection Using Double Compression Jpeg Artifact-a Review

Image authentication and image tamper detection. Double JPEG compression might occur when a portion is cut from an image which may or may not be: Image tamper detection using passive-blind techniques has become a hot research field. It uses non-intrusive methods which uses image functions to detect tampering. The tampering operation changes the inherent statistical properties of an image which is not visible by naked eye and thus can be used as footprint by the tamper detection algorithm. The focus of the current paper is to study the artifacts introduced by JPEG recompression which can act as a footprint in passive JPEG compressed and pasted on another JPEG target image to create a fake image that may have traces of double compression. Detection of double JPEG compression finds an important place in digital image forensics. The present paper provides a review of various existing methods and their drawbacks. The study will be helpful in overcoming the limitations of existing methods and designing new image tamper detection techniques