New Weapon in Web War Over Piracy -- NY Times

Doesn't mention that directly image collections (e.g. flickr or artstor) but this is potentially quite relevant to that.

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New Weapon in Web War Over Piracy
By BRAD STONE and MIGUEL HELFT
Published: February 19, 2007
Content-recognition software could address a major entertainment industry concern— songs and videos being posted on the Web without permission.
http://www.nytimes.com/2007/02/19/technology/19video.html?ex=1329541200&en=ac662a919b4ff2cb&ei=5124&partner=permalink&exprod=permalink