Mark Wyner’s journal

Find me at Bunker

I like to talk endlessly about anything related to soccer, the cosmos, and making our corner of it a better place to be, which may tickle your fancy.

Thursday, February 10, 2011

Identifying Authenticity of Digital Photos

Dartmouth computer scientist and forensic imaging specialist Hany Farid has taken a unique approach to identifying the authenticity of digital photos. And he’s standing on the shoulders of gun ballistics to get the job done.

Just as gun barrels leave unique grooves in bullet casings, digital cameras leave unique markings in the images they produce. Hany Farid is building a database of these signatures and pairing them with their respective cameras. 10,000+ of them.

When an image has been manipulated, these signatures are disturbed. And that’s where his system comes into play: detecting those disturbances. He claims “If Photoshop touches that image, we will know about it.”