Apparatus for discriminating light source having spectrum peaks

Details Apparatus for discriminating light source having spectrum peaks Apparatus for discriminating light source having spectrum peaks

1988-09-08

1990-04-03

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

354430, 356222, 356226, G01J 102

Patent

active

049147382

ABSTRACT:
A light source discriminating apparatus includes three photosensors, two of which have similar spectral sensitivity characteristics to each other. The apparatus senses the difference in the energy distribution of light sources by comparing the ratios of the light intensity sensed by these photosensors. In this manner, the type of a light source having a spectrum peak in the energy distribution of the light emanating from the source may be discriminated as a fluorescent light source, for example. The results of discrimination may be used effectively for adjusting white balance or shutter speed of a video or electronic still camera.

REFERENCES:
patent: 4041308 (1977-08-01), Fujita
patent: 4079388 (1978-03-01), Takahama et al.
patent: 4220412 (1980-09-01), Shroyer et al.

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