Illuminant discriminator

Details Illuminant discriminator Illuminant discriminator

1988-01-28

1989-05-02

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 324 77B, 364485, G01R 2316

Patent

active

048271195

ABSTRACT:
The present invention is an apparatus for discriminating among various types of illuminants such as fluorescent light, tungsten light and natural daylight. The apparatus is comprised of an analog portion and a digital portion. The analog portion functions to convert incident light into a conditioned analog signal. The digital portion utilizes an analog-to-digital converter and a microprocessor to perform a Fourier series analysis on one or more of the harmonics of the illuminant signal. The microprocessor compares the amplitudes of the harmonics against the amplitudes of known illuminant sources to identify the source.

REFERENCES:
patent: 4220412 (1980-09-01), Shroyer et al.
patent: 4296374 (1981-10-01), Henry
patent: 4301404 (1981-11-01), Ley
patent: 4686457 (1987-11-01), Banno

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