Method and apparatus for reducing the unwanted effects of noise

Details Method and apparatus for reducing the unwanted effects of noise Method and apparatus for reducing the unwanted effects of noise

1996-02-20

1997-12-23

Hantis, K.

Optics: measuring and testing

For optical fiber or waveguide inspection

356326, 356376, G01B 1124, G01J 350

Patent

active

057011737

ABSTRACT:
A method and apparatus is provided that lessens the unwanted effects of noise present at the input of an imaging system. By tapping a small portion of a laser input signal containing wavelengths of light corresponding to red, blue, and green of light used to scan the surface to be imaged, the tapped signal is used to generate three beams that correspond to the red, blue, and green content of the laser input signal. Signals generated at the output of the system that correspond to the color of the scanned surface are normalized with the signals that correspond to the three beams generated by the tapped signal. The normalized output signal indicative of the color of the surface is noise reduced; substantially most of any noise present at the input is eliminated from the output of the device.

REFERENCES:
patent: 4627734 (1986-12-01), Rioux
patent: 4946281 (1990-08-01), Dell'Eva et al.
patent: 5177556 (1993-01-01), Rioux
Laser range finder based on synchronized scanners. Marc Rioux, 1 Nov. 1984/vol. 23, No. 21 Applied Optics. pp. 3837-3844.

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