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Circuit-for-performing-white-balance-correction-using-two-color-temperature-sensors

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Circuit for performing white balance correction using two color temperature sensors

Details

Inventors: Seki, Mitsuo; Tanii, Keiichi;
Assignee: Sanyo Electric Co., Ltd. (Osaka, JP)
Primary Examiner: Shepperd; John W.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein & Kubovcik

A circuit for performing white balance correction using two color temperature sensors includes an image sensor for converting an image of an object to a color image signal, a luminance signal/color signal separator for separating an output of the image sensor into a luminance signal and a color signal, and at least one level correction means for correcting a level of the color signal output from the luminance signal/color signal separator, based on a first white balance correction signal or a second white balance correction signal supplied through a switching or disabling means. A first white balance correction signal generator is provided independently of the image sensor and generates the first white balance correction signal correlating to a color temperature of the object. A second white balance correction signal generator generates the second white balance correction signal correlating to the color temperature of the object, based on the luminance signal output from the luminance signal/color signal separator and the color signal having the level corrected by the level correction means.

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a white balance correction circuit which can overcome the disadvantages of both of the aforementioned first and second automatic-tracing system white balance correction circuits and which can continuously perform precise white balance correction.
Briefly stated, the white balance correction circuit according to the present invention is provided with first white balance correction means for performing white balance correction on the basis of the color temperature of an object and second white balance correction means for performing white balance correction on the basis of average levels of color difference signals, to switch operating states of the first white balance correction means and the second white balance correction means in response to the image pickup state of the object.
According to the present invention, disadvantages of the first and second white balance correction means can be eliminated without damaging advantages thereof.
These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings

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