Two researchers at New York University have created a new type of camera flash that could potentially remove problems such as red eye occurring in the pictures we take.
A camera flash is necessary in low light conditions to ensure a good image is captured. But the problem is that flash of light can result in red eye, closed eyes, and if you ever watch the film stars walking down the red carpet at their latest premier; thousands of flashes of light isn’t the most pleasant thing to watch in the world.
This new flash Rob Fergus and Dilip Krishnan are developing gets around those problems by being invisible. In other words, it does not use visible light. Instead they use infrared and ultraviolet light as the “dark flash” and modified the camera using it to recognize those frequencies.
Taking a picture in this way does not produce a perfect image, though, as the result is the equivalent of what you’d expect to see through night vision goggles. To rectify that the camera also takes a second capture of the scene being photographed without the aid of the flash. Those two pictures are then combined using software to produce the final image.
The use of software to combine the images also allows the images to be improved, for example, unwanted reflections can be automatically taken out. The combining of the images is not perfect, however, and the image capture can miss fine detail like freckles.
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