Out-of-Focus Images; Some Properties, Uses, and a Geometrical Explanation
Applied Optics, Vol. 6, Issue 9, pp. 1559-1559 (1967)
http://dx.doi.org/10.1364/AO.6.001559
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Abstract
Out-of-focus images tend to move and split when obstructions are passed through or near the nodal planes of the image forming lens, while in-focus images do not show such effects. Geometrical optics is used to produce a qualitative explanation of these effects with the object of utilizing them for automatic focusing and rangefinding devices. Several problems in such devices are briefly discussed and a proposed automatic rangefinder is described.
Citation
W. J. Harrison, "Out-of-Focus Images; Some Properties, Uses, and a Geometrical Explanation," Appl. Opt. 6, 1559-1559 (1967)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-6-9-1559
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