Night Photography Without Flash

Finally: a flash camera without all the usual problems, especially for night photography. By using a flashbulb that emits ultraviolet and infrared light (neither of which the human eye can detect) instead of visible light, New York University's Dilip Krishnan and Rob Fergus have come up with dark photography that will neither blind your subject nor produce the unwanted glare of a harsh flash in the developed photo.

Dark photography uses a camera that takes photos with an invisible flash of infrared and ultraviolet light points to a smarter way to take photos in the dark.

On their own, IR and UV exposures produce photos that have strange, unrealistic coloring. But Krishnan and Fergus have taken care of that as well. Their system processes IR and UV exposures into true color, by combining two photos taken in quick succession into a superior final image.

Their camera first takes a photo with an IR/UV flash, which produces an image that has clearly illuminated detail, but the wrong color palette. Following this first shot, the camera immediately takes a second shot with no flash; this one gives the camera the right coloring, but, without enough illumination, has a grainy, blurry look. Finally, Krishnan and Fergus's software merges the two photos into an image that has both fine detail and correct hues.