Method for measuring a distance

Details Method for measuring a distance Method for measuring a distance

1998-07-28

2000-04-18

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

Triangulation ranging with photodetection, but with no...

2502018, 396104, 396121, 396128, G01C 300, G01B 904

Patent

active

060521759

ABSTRACT:
In a method of measuring a distance, an evaluation function indicating a degree of coincidence of a pair of image data projected onto a pair of sensor arrays through a pair of focusing lenses is found, and a ratio of a valley value of a transition graph and a gradient of the transition graph are calculated by using a minimum and least value of the evaluation function and two values of the evaluation function adjacent to the minimum and least value. Then, the distance between the focusing lens pair and an object based on the evaluation function is calculated. Also, reliability of the calculated distance based on the calculated ratio is inspected. Thus, the calculated distance data is accurate and reliable.

REFERENCES:
patent: 4107520 (1978-08-01), Wilwerding
patent: 5880826 (1999-03-01), Jung et al.

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