White balance adjustment device

Details White balance adjustment device White balance adjustment device

1993-11-26

1996-04-02

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348226, 348227, 348655, H04N 973

Patent

active

055045251

ABSTRACT:
A white balance adjustment device adapted to be used in contexts where a photographic subject is illuminated with fluorescent lighting. The white balance adjustment device includes an imaging device for forming an image of a photographic subject and for outputting signals representing the image. An adjustment mode selection device is included for selecting a white balance adjustment mode according to the kind of light source used to illuminate the photographic subject. A measurement unit is used to measure color aspects of the light source used to illuminate the photographic subject. White balance adjustment circuitry is included to adjust the white balance of the output of the imaging device in accordance with the adjustment mode selected by the adjustment mode selection device and in accordance with the measured color aspects of the light source used to illuminate the subject. A method of performing white balance adjustment includes the steps of imaging a subject to produce a video signal representing an image of the subject, color separating the video signal into its primary light color components, measuring the color attributes of light used to illuminate the subject to produce a color measurement value, matching the color measurement value with a predetermined parameter to produce a processing parameter which corresponds to the type of light used to illuminate the subject, and performing white balance adjustment of the video signal using the processing parameter.

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