27 March 1995 Three-dimensional range information from single-frame incoherently illuminated images
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Abstract
A system is described that will give the range to different portions of a scene. The optical system is modified such that the optical transfer function has periodic nulls, with the period of the nulls depending on the axial distance within the volume of the 3D scene. These same nulls appear in the spatial frequency spectrum of the images of objects that are at different distances within the volume of the scene. Estimation of the period of the nulls in the spatial frequency spectrum of the image then gives the ranges to different objects within the scene. A similar optical/digital processing technique is used to extend the depth of field of the composite system so that it will work over larger changes in range.
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W. Thomas Cathey, W. Thomas Cathey, Edward R. Dowski, Edward R. Dowski, } "Three-dimensional range information from single-frame incoherently illuminated images", Proc. SPIE 2423, Machine Vision Applications in Industrial Inspection III, (27 March 1995); doi: 10.1117/12.205503; https://doi.org/10.1117/12.205503
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