Hani Farid
PER
Farid Hani Farid
With a grant from the Federal Bureau of Investigation, which is interested in ways of authenticating digital images presented in court, Dr. Hani Farid an applied mathematician at Dartmouth is devising algorithms to detect alterations. His work has attracted interest from many people, he said, including eBay customers concerned about the authenticity of images. The human eye is largely indifferent to changes in lighting, Dr. Farid said, but conflicting sources of illumination in a single image can be detected by computer analysis and are a sign of manipulation.