Synthesized holograms in medicine and industry

Holograms can be synthesized from a series of photographic images, and such holograms are convenient for displaying 3D images even if conventional holograms are difficult or impossible to record. Three kinds of synthesized holograms, multiple-exposure holograms, cylindrical holographic stereograms and conical holographic stereograms, are described for the purpose of medical and industrial 3D display.