Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1975-10-23
1978-01-31
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250550, 356 4, 356163, G02B 2738, G01C 1112
Patent
active
040717720
ABSTRACT:
Apparatus to automatically analyze stereoscopic images comprising the determination of the maximum degree of correlation between two similar images of the same object projected by two objectives, for instance in a rangefinder, wherein the two images are superimposed on one or two spatial frequency filters identical in their structures, and wherein the particular generated superimposition signal, is preferably applied to a particular photoelectric detector and wherein the output signals from the latter are used for display and/or control purposes. The apparatus is improved by a system (20,20',21,21',22-25; 30-34) for generating a reference beam indicating mechanical changes affecting the image position of at least one of the measuring beams, at least one photoelectric detector (28,29;40) being associated with the one reference beam, the output signals from the one detector corresponding to the mechanical changes being used to display and/or correct the changes or the effects of same.
REFERENCES:
patent: 3347129 (1967-10-01), Lohringer
patent: 3499711 (1970-03-01), Argyle
patent: 3553455 (1971-01-01), Sato et al.
patent: 3663105 (1972-05-01), Anderson
patent: 3804525 (1974-04-01), Caudill
patent: 3891321 (1975-06-01), Hock
Heitmann Knut
Leitz Ludwig
Schmidt Horst
Ernst Leitz GmbH
Moore David K.
Smith Alfred E.
Wells Gilbert L.
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