Digital image forensics

被引：37
|
作者：
Farid, Hany [1 ,2 ]
机构：
[1] Dartmouth Coll, Associate Chair Comp Sci, Hanover, NH 03755 USA
[2] Inst Secur Technol Studies, Dartmouth, NS, Canada
来源：
SCIENTIFIC AMERICAN | 2008年 / 298卷 / 06期
关键词：
D O I：
10.1038/scientificamerican0608-66
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Fraudulent photographs produced with powerful, commercial software appear constantly, spurring a new field of digital image forensics. Many fakes can be exposed because of inconsistent lighting, including the specks of light reflected from people's eyeballs. Algorithms can spot when an image has a cloned area or does not have the mathematical properties of a raw digital photograph. A person's iris are circular in reality but will appear increasingly elliptical as the eyes turn to the side or up or down. One can approximate how eyes will look in a photograph by tracing rays of light running from them to a point called the camera center. Modern software has made manipulation of photographs easier to carry out and harder to uncover than ever before, but the technology also enables new methods of detecting doctored images.
引用
收藏
页码：66 / 71
页数：6
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