Passive Techniques of Digital Image Forgery Detection: Developments and Challenges

Abstract

Photographs and images play an important role in our lives but, in this technology era, equipped with powerful, low cost, and easy to use photo editing tools, people often forge photographs. This practice has posed a question mark on the trustworthiness of images necessitating separation of original images from the tampered lot. Because carefully edited and forged images are very hard to be distinguished from their genuine copies therefore, forgery detection and separation of the forged images from the innocent and genuine ones has become a challenging issue for image analysts. Image forgery detection procedures are generally classified into two broad categories; the active and the passive detection techniques. This paper presents a state of the art review of different passive forgery detection techniques those are proposed by different authors over time.