17 February 2010 Analysis of depth of field of stereoscopic cameras in lens-tilt configurations
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Abstract
Live three-dimensional movies are acquired with stereoscopic cameras. Since there is a limitation of disparity for binocular fusion, it is necessary to restrict objects of shooting within an allowable range. This problem is more severe for stereoscopic LED display because of its large pitch. One of the answers to this problem is to control the depth of field. Objects outside the allowable range are blurred and objects inside the allowable range are in focus. In this study, we propose a method to control the depth of field of stereoscopic images continuously by lens-tilt imaging. There are two types of configurations in the lens-tilt stereoscopic imaging. One is a convergent configuration and the other is a divergent configuration. We analyze the relationships between the lens-tilt angle, the ratio of the lens-to-imaging device distance to focal length, and the plane-of-sharp-focus angle. Then the near and far limits of the depth of field of stereoscopic cameras in lens-tilt configurations are formulated geometrically. It is revealed that the depth of field in the divergent configuration is larger than that in the convergent configuration even if the distance between the two lenses is the same. The analyses and continuous control of the depth of field are also confirmed experimentally.
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Naoki Kaneko, Shiro Suyama, Hirotsugu Yamamoto, "Analysis of depth of field of stereoscopic cameras in lens-tilt configurations", Proc. SPIE 7524, Stereoscopic Displays and Applications XXI, 75241I (17 February 2010); doi: 10.1117/12.839581; https://doi.org/10.1117/12.839581
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