Method and apparatus for automatic optical recognition of road s

Details Method and apparatus for automatic optical recognition of road s Method and apparatus for automatic optical recognition of road s

1995-04-19

1997-05-27

Johns, Andrew

Image analysis

Applications

382211, G06K 974

Patent

active

056339445

ABSTRACT:
A process and device for automatic recognition of an object such as a road sign includes a laser beam source providing a laser beam capable of passing through a modulator on which an intensity spectrum of reference signs and a sign to be recognized has been pre-recorded. A converging lens positioned downstream of the modulator, as well as devices for observing and/or analyzing the spectrum occurring at the focal plane of the lens. These devices include apparatus for detecting peaks indicating that a reference sign is identical to a sign to be recognized, as well as apparatus to separate those peaks from spurious peaks. As an example, this device can automatically recognize speed limit signs on roads or freeways.

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Q. Tang et al., "Multiple-object detection with a chirp-encoded joint transform correlator," Applied Optics, vol. 32, No. 10, Sep. 1993, pp. 5079-5088.

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