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Small sensor
Most imaging systems, such as those found in digital cameras, use a lens to focus a scene on a sensor studded with millions of tiny sensors. More sensors means more detail is captured and, generally, produces a higher resolution image.
The imaging system developed by graduate student John Hunt and colleagues at Duke University in North Carolina has no lens and instead combines a metamaterial mask or aperture and complicated mathematics to generate an image of a scene.
The aperture is used to focus different wavelengths of light in different parts of a scene onto a detector. The different frequencies in the scene are sampled sequentially.
This sampling helped to work out the distribution and mix of light wavelengths and their relative intensities found in a scene, said Mr Hunt.

Lens-less camera emerges from metamaterials work - BBC News Cheap sensors that help cars avoid collisions could emerge from US research into a lens-less imaging system.