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Fancy Figuring Ferrets Out Fake Photos
听力内容：
60秒科学节目（SSS）是科学美国人网站的一套广播栏目，英文名称：Scientific American – 60 Second Science,节目内容以科学报道为主，节目仅一分钟的时间，主要对当今的科学技术新发展作以简明、通俗的介绍，对于科学的发展如何影响人们的生活环境、健康状况及科学技术，提供了大量简明易懂的阐释。
Marilyn Monroe riding a T. Rex on the moon? Sure. All it takes is a little photo editing software.
One of the most effective ways to spot less obvious fakes is to look at the shadows cast by objects in the picture. If they’re pointing in different directions, chances are the image you’re looking at isn’t real. But the analysis can be challenging when the objects have complex shapes and the shadows are cast on uneven surfaces.
That’s why Dartmouth and UC Berkeley researchers have developed software that analyzes images on two fronts. The program tracks the shapes and angles of different shadows for inconsistencies. It also uses geometric algorithms to determine the angle of illumination on each object, which should match up if there’s a single light source. This research appears in the journal ACM Transactions on Graphics. [Eric Kee, James O’Brien and Hany Farid, Exposing Photo Manipulation with Inconsistent Shadows]
The researchers tested their software on a 1969 moon-landing photo. Conspiracy theorists often point to the complex orientation of shadows in the picture as evidence it was doctored. But the computer analysis says it’s kosher. Looks like we might have made it to the moon after all.
–Larry Greenemeier
