BIB-VERSION:: CS-TR-v2.0
ID:: ncstrl.dartmouthcs//TR2008-629
ENTRY:: July 08, 2008
ORGANIZATION:: Dartmouth College, Computer Science
REQUESTED-BY:: farid@cs.dartmouth.edu
REQUESTED-FOR:: kimo
REQUESTED-DATE:: Mon Jun 23 15:17:06 EDT 2008
TITLE:: Lighting and Optical Tools for Image Forensics
TYPE:: Technical Report (paper)
REVISION:: 1
AUTHOR:: Johnson, Micah K.
DATE:: July 2008
RETRIEVAL:: For a paper copy, email <reports@cs.dartmouth.edu>
RETRIEVAL:: For a paper copy, write to
       Technical Report Librarian
       Department of Computer Science
       Dartmouth College
       6211 Sudikoff Laboratory
       Hanover, NH 03755-3510
       USA
RETRIEVAL:: PDF at http://www.cs.dartmouth.edu/reports/TR2008-629.pdf
ABSTRACT:: 
We present new forensic tools that are capable of detecting traces of tampering in digital images without the use of watermarks or specialized hardware.  These tools operate under the assumption that images contain natural properties from a variety of sources, including the world, the lens, and the sensor. These properties may be disturbed by digital tampering and by measuring them we can expose the forgery.   
In this context, we present the following forensic tools: (1) illuminant direction, (2) specularity, (3) lighting environment, and (4) chromatic aberration.  The common theme of these tools is that they exploit lighting or optical properties of images.  Although each tool is not applicable to every image, they add to a growing set of image forensic tools that together will complicate the process of making a convincing forgery.
NOTE:: 
Ph.D Dissertation. Advisor: Hany Farid.
END:: ncstrl.dartmouthcs//TR2008-629