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Ghost Imaging in Three Dimensions

Single-pixel detectors can be used to reconstruct three-dimensional images after patterned illumination of an object. [Also see Report by Sun et al.] Images are usually captured with a two-dimensional (2D) "device"—the retina, a piece of film, or a detector array—and extra processing is needed to create an image that we perceive as 3D. On page 844 of this issue, Sun et al. (1) demonstrate how to create 3D images of an object by capturing light with little more than a few single-pixel detectors. The detectors have only one pixel and cannot possibly reconstruct even a 2D image on their own. Yet, by properly illuminating the scene and using so-called "computational ghost imaging" techniques, the authors can render beautiful 3D images.