Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1992-05-12
1993-06-08
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 3, 356 4, G01C 300
Patent
active
052184145
ABSTRACT:
A distance measuring apparatus which can accurately measure the distance to an object and keep track of the object. In the apparatus, a pair of image-pickup optical systems pick up an object. A window including the object is set in an image picked up by one of the image-pickup optical systems. The distance to the object is measured by calculating correlation between the image in the window and an image picked up by the other image pickup optical system. Tracking an object is also possible by taking a correlation of images in the window formed in a time sequence. Adequate exposure is determined from an image signal in the window so that the image pickup optical systems are controlled to set the adequate exposure to the image in the window. Contrast of an image in the window becomes distinct, thus enabling accurate distance calculations and tracking of an object.
REFERENCES:
patent: 4668084 (1987-05-01), Suzuki et al.
patent: 4695156 (1987-09-01), Taft
patent: 4698493 (1987-10-01), Fried
patent: 5023712 (1991-06-01), Kajiwara
patent: 5057681 (1991-10-01), Beder et al.
Nikon F4 Product Brochure (Dec. 15, 1988).
Canon EOS 10 Product Brochure (Mar. 1990).
Hellner Mark
Mitsubishi Denki K.K.
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