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Three-dimensional (3-D) imaging systems are the appropriate technology
to meet modern advanced demands, and they have been a popular topic since
the 2000s. 3-D imaging techniques have been studied since Sir C. Wheatstone
invented "stereoscopy" in 1838,1 but there has been renewed emphasis
since the 2009 release of the 3-D movie Avatar. Generally, 3-D imaging systems
acquire 3-D information of real or virtual objects, and show the 3-D
images or video, including the width, height, and depth characteristics of the
objects, to observers naturally (whereas conventional two-dimensional (2-D)
images are unnatural). Nowadays, 3-D systems are widely used and developed
in movies and various fields, and the investment in this field continues to
increase.
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