Displaying a variety of scenes with deep depth is a major challenge in integral 3D display technologies since their
depth-reconstruction range is very restrictive. Here we attempt to develop a method 'depth-compression expression,' in which the depth of 3D scenes are compressed, or modified in the axial direction, so that the appearances of the depth-compressed scenes are kept natural for viewers. Based on the subjective evaluation experiments using an integral 3D simulator that provided binocular and motion disparities, we show that scenes can naturally be expressed within shallower depth ranges than ones of originals. Specifically, by using the non-linear depth compression method to generate depth-compressed scenes, a variety of scenes, even with more than 100 m of depth, were expressed only within 1 m of depth-ranges without inducing unnaturalness for viewers. These results suggest that our method would allow integral 3D displays to show any scenes with deep depth if developments of integral 3D displays can achieve at least 1 m of depth reconstruction.
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