Holographic imaging is typically done by splitting a laser beam in two, shining one beam on an object and then letting that modified light interfere with a reference beam that does not hit the object. The recorded interference pattern can be read out with another laser to form a three-dimensional real image. By using multipixel electronic cameras rather than photographic film, researchers can computationally analyze and process the data for better effect. Clemente et al. modify this setup for ghost imaging by replacing the camera with a single-pixel detector (as conventionally used in ghost imaging) by using a randomly structured optical beam and scanning for a set of discrete phase shifts in the reference beam (that is, the beam not directly influenced by the object).Just don't do this while wearing you ghoulish costumes.
Zz.
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