A Novel Approach for Detecting of Tampering On Images

In Our Society Digital Images Are Powerful And Widely Used In Communication Medium. They Have An Important Impact On Our Lives. In The Recent Years, Due To The Advent Of High Performance Commodity Hardware And Improved Human Computer Interfaces. It Has Become Relatively Easy To Create The Fake Images. In The Modern Days, It Is Easy To Use Image Forgeries That Are Undetectable By The Naked Eye. We Make The Assumption That The Image Is Acquired Using A Color Filter Array, And That Tampering Removes The Artifacts Due To The Demosaicking Algorithm. A New Feature Measuring The Presence Of Demosaicking Artifacts At A Local Level, And On A New Statistical Model Allowing Deriving The Tampering Probability Of Each 2x2 Image Block Without Requiring To Know A Priori The Position Of The Forged Region. Experimental Results On Different Cameras Quipped With Different Demosaicking Algorithms Demonstrate Both The Validity Of The Theoretical Model And The Effectiveness Of Our Scheme.