Inter-vehicle distance detecting device

Details Inter-vehicle distance detecting device Inter-vehicle distance detecting device

1993-02-05

1994-06-14

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

180167, 2502016, 2502018, 348139, G01C 300, B60T 716, H04N 718

Patent

active

053214889

ABSTRACT:
An inter-vehicle distance detecting device comprising: a pair of image sensors on which an image of an object in front of a driving car is formed by a pair of optical systems; an image display means for displaying a first image information taken by one of the pair of image sensors; a window setting means for setting a plurality of windows partitioning a region of the image on the first image information; a distance detecting means for calculating respective distances from the driving car to the object surrounded by the respective windows by comparing a second image information in the respective windows set by the window setting means with a third image information taken by the other of the pair of image sensors corresponding to the second image information and by detecting a shift between the second image information and the third image information; a determining means for determining the object for measurement based on the distances to the respective windows provided by the distance detecting means; a gate setting means for setting a gate partitioning the region such that the gate approximately surrounds the object for measurement based on the distances corresponding to the object for measurement; a symmetry determining means for determining symmetry of a fourth image information surrounded by the gate and selected from the first image information and for obtaining a position of a symmetry line; and a predicting means for predicting the presence of a preceding car in front of the driving car by determining a first stability of a movement of the symmetry line provided by the symmetry determining means in the horizontal direction and by determining a second stability of the distances provided by a calculation result of the distance determining means over time.

REFERENCES:
patent: 4926346 (1990-05-01), Yokoyama
patent: 4987357 (1991-01-01), Masaki
patent: 5131740 (1992-07-01), Maekawa
patent: 5159557 (1992-10-01), Ogawa
patent: 5237406 (1993-08-01), Karasudani et al.

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