Range determination method and apparatus

Details Range determination method and apparatus Range determination method and apparatus

1987-07-30

1989-06-27

Ruggiero, Joseph

Boots, shoes, and leggings

250578, 356 4, 356 23, 358107, 901 1, G06F 1520, G01C 308

Patent

active

048435651

ABSTRACT:
A system for determining range, particularly for robotic applications, is disclosed. The system preferably includes a single camera and at least two light sources. The lights can be turned on and off independently and are located at different distances from the target object. To determine the range, the intensity of each pixel is recorded with the front light on, then the intensity is recorded with the rear light on. The ratio of these two intensities is a unique function of range, regardless of the reflectivity of the object. If there is ambient light illuminating the object, its value must be subtracted from the intensity measurements prior to calculating the ratio.

REFERENCES:
patent: 4146924 (1979-03-01), Birket et al.
patent: 4305658 (1981-12-01), Yoshida
patent: 4499492 (1985-02-01), Hutchin
patent: 4601053 (1986-07-01), Grumet
patent: 4695959 (1987-09-01), Lees et al.

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