Automatic white color adjuster for television camera

Abstract

Abstract PURPOSE:To improve an accuracy in an automatic white color adjustment by performing the white color adjustment correctly even when picking up an image under an illumination light source having a spectral characteristic which does not follow the law of the black body radiation and performing the white color adjustment generally equally to the convention when picking up the image under the illumination light source having the spectral characteristic which follows the law of the black body radiation. CONSTITUTION:An output control voltage of a non-linear amplifier 9 is selected to a level converting characteristic shown by a solid line I with respect to a mired (micro- reciprocal-degree) number. The level converting characteristic I is a generally complementary characteristic with respect to a level ratio R/Y to the mired number characteristic of a red color signal and a luminance signal and a part thereof is selected to a non-linear characteristic having a characteristic (shown by an asterisk) required for the white color adjustment when the image of an object of a fluorescent light is picked up. Similarly, the output control voltage to the mired number characteristic of a non-linear amplifier 10 is, as shown by a solid line II, selected to the non-linear level converting characteristic, as a part thereof has the characteristic shown by the asterisk required for the white color adjustment in picking up the image of the object under the illumination of the fluorescent light.

Inventors

• 👤 Kazuhiko Ueda
• 👤 和彦 上田

Bibliographic Details