White balance control system including a fluorescent light ripple detector
First Claim
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1. A white balance control system, comprising:
- color temperature detecting means for detecting a color temperature of light received thereby from the direction of an object to be imaged and for generating a first output signal as a function thereof, said output signal including a ripple component when said received light flickers, said ripple component being indicative of the magnitude and frequency of the flickering of said received light;
ripple detecting means for detecting said ripple component of said first output signal and for generating a second output signal as a function thereof; and
white balance control means for controlling the gain of respective color control amplifiers as a function of both said first and second output signals.
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Abstract
A white balance control system comprises a ripple detecting circuit for detecting a ripple component associated with a fluorescent lamp source or the like which is contained in light from an object being photographed. Alternatively a circuit may be provided for detecting a particular color temperature from color temperature information which is used in a white balance control. A white balance adjusting circuit responds to an output from either the ripple detecting circuit or the detecting circuits to provide a correction for any offset in the white balance control.
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Citations
14 Claims
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1. A white balance control system, comprising:
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color temperature detecting means for detecting a color temperature of light received thereby from the direction of an object to be imaged and for generating a first output signal as a function thereof, said output signal including a ripple component when said received light flickers, said ripple component being indicative of the magnitude and frequency of the flickering of said received light; ripple detecting means for detecting said ripple component of said first output signal and for generating a second output signal as a function thereof; and white balance control means for controlling the gain of respective color control amplifiers as a function of both said first and second output signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14)
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9. A white balance control system, comprising:
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color temperature detecting means for detecting a color temperature of light received thereby from the direction of an object to be imaged and for generating a first output signal as a function thereof, said output signal including a ripple component when said received light flickers, said ripple component being indicative of the magnitude and frequency of the flickering of said received light; ripple detecting means for detecting said ripple component of said first output signal and for generating a second output signal as a function thereof; color temperature discriminating means responsive to said first output signal for determining when said received light has a predetermined color temperature and for generating a third output signal as a function thereof; and white balance controlling means for controlling the gain of respective color signal amplifiers of said system as a function of said first, second and third output signals. - View Dependent Claims (10, 11, 12, 13)
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Specification