Date Added: Mar 2012
The detection of JPEG compression plays an important role in digital forensics. The JPEG image can be compressed one, two, three or n times. But if the number of times of the compression of a same JPEG image increases, the process of detection of the JPEG compression will be difficult. If the compression is done using the same quantization matrix the detection is even more difficult. There are mainly two reasons why forensic experts give attention to the detection of JPEG compression. The first one is that due to image forgery compressed JPEG images often resulted. The second one is that some JPEG steganographic schemes such may generate doubly compressed images or triply compressed images if the input cover image is in JPEG format.