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, 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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