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Fancy Figuring Ferrets Out Fake Photos
想要辨別假照片
Marilyn Monroe riding a T. Rex on the moon? Sure. All it takes is a little photo editing software.
瑪麗蓮夢露在月球上騎著霸王龍？當然可能。只需要用一個小小的圖片編輯軟件就能做到。
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.
辨別比較逼真的假照片最有效率的方法之一就是看圖片中各個物體的陰影方向。如果物體陰影指向不同方向，那么這張照片八成是假的。但是當物體形狀復雜，陰影照在不平的表面上的時候分析起來就有點困難了。
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.
這就是達特茅斯大學和加州大學伯克利分校的研究人員開發從兩個面分析圖像的軟件的原因。該程序追蹤不同陰影形狀和角度的一致性。它還能利用幾何算法確定燈光照到每個物體的角度，如果是單光源的話，角度應該是一致的。這項研究發表在ACM Transactions on Graphics期刊上。
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.
研究人員用一張1969年登陸月球的照片測試了他們的軟件。陰謀論者總是說這張陰影取向復雜的照片是偽造的。但是計算機分析顯示這張圖是真的。看來我們真的登錄了月球。
—Larry Greenemeier
