TY - GEN
T1 - Authenticating contrast and brightness adjusted images using distributed source coding and expectation maximization
AU - Lin, Yao Chung
AU - Varodayan, David
AU - Fink, Torsten
AU - Betters, Erwin
AU - Girod, Bernd
PY - 2008
Y1 - 2008
N2 - Media authentication is important in content delivery via untrusted intermediaries, such as peer-to-peer (P2P) file sharing. Many differently encoded versions of a media file might exist. Our previous work applied distributed source coding not only to distinguish the legitimate diversity of encoded images from tampering but also localize the tampered regions in an image already deemed to be inauthentic. An authentication decoder was supplied with a Slepian-Wolf encoded image projection as authentication data. We extend our scheme to authenticate contrast and brightness adjusted images using an Expectation Maximization algorithm. Experimental results demonstrate that the proposed algorithm can distinguish legitimate encodings of authentic contrast and brightness adjusted images from illegitimately modified versions using authentication data of about 100 bytes.
AB - Media authentication is important in content delivery via untrusted intermediaries, such as peer-to-peer (P2P) file sharing. Many differently encoded versions of a media file might exist. Our previous work applied distributed source coding not only to distinguish the legitimate diversity of encoded images from tampering but also localize the tampered regions in an image already deemed to be inauthentic. An authentication decoder was supplied with a Slepian-Wolf encoded image projection as authentication data. We extend our scheme to authenticate contrast and brightness adjusted images using an Expectation Maximization algorithm. Experimental results demonstrate that the proposed algorithm can distinguish legitimate encodings of authentic contrast and brightness adjusted images from illegitimately modified versions using authentication data of about 100 bytes.
KW - Distributed source coding
KW - Expectation Maximization
KW - Image authentication
UR - http://www.scopus.com/inward/record.url?scp=54049146351&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=54049146351&partnerID=8YFLogxK
U2 - 10.1109/ICME.2008.4607509
DO - 10.1109/ICME.2008.4607509
M3 - Conference contribution
AN - SCOPUS:54049146351
SN - 9781424425716
T3 - 2008 IEEE International Conference on Multimedia and Expo, ICME 2008 - Proceedings
SP - 613
EP - 616
BT - 2008 IEEE International Conference on Multimedia and Expo, ICME 2008 - Proceedings
T2 - 2008 IEEE International Conference on Multimedia and Expo, ICME 2008
Y2 - 23 June 2008 through 26 June 2008
ER -