Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1991-07-25
1993-10-19
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354408, 180167, G01C 300, G01C 500, B60T 716
Patent
active
052550648
ABSTRACT:
The present invention provides a distance-measuring equipment for measuring the distance from a moving target on the principle of triangulation by electrically detecting the relative dislocations of first and second images focused on the image sensors of paired first and second optical systems through the comparison of image signals respectively provided by the image sensors comprising: a windowing unit for forming a window by selecting specific image signal from either of the image signals stored in the respective memory means, and storing it as a reference image signal in a window memory; and also having a window reforming function for reforming the window at predetermined time intervals, characterized in that a microprocessor compares the reference image signal and another image signal by shifting the latter signal each time for one or more than one bit in accordance with a predetermined shift pattern, and having an interpolation calculating function so as to improve the resolution for detecting the dislocation of the two image signals more precisely and calculating the distance from the moving target. By use of the equipment as constructed above, the time required for calculation can be greatly reduced, yet precision of the distance measurement is improved and thereby reliability thereof can also be improved.
REFERENCES:
patent: 3324238 (1967-06-01), Stavis
patent: 3443100 (1969-05-01), Fried
patent: 5023712 (1991-06-01), Kajiwara
patent: 5131740 (1992-07-01), Maekawa
patent: 5139327 (1992-08-01), Tanaka
Buczinski Stephen C.
Mitsubishi Denki & Kabushiki Kaisha
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