Apparatus using brightness information from a photometering circuit and a brightness-converted green component from a color metering circuit to ultimately adjust white balance

Claim 2

A white balance adjuster of a camera comprising: photometering means for metering a brightness of an object based on light directed to an image pickup means of the camera; color metering means for metering a color temperature of light at a periphery of the camera; and control means for controlling a white balance so as to adjust a color balance of an output signal from said image pickup means on the basis of object brightness information produced by said photometering means and brightness converted information produced by said color metering means; wherein the brightness converted information is a green component output of said color metering means.

Claim 3

A white balance adjuster of a camera comprising: photometering means for metering a brightness of an object based on light directed to an image pickup means of the camera; color metering means for metering a color temperature of light at a periphery of the camera; and control means for controlling a white balance so as to adjust a color balance of an output signal from said image pickup means on the basis of a difference between object brightness information produced by said photometering means and brightness converted information produced by said color metering means.

Claim 4

A white balance adjuster of a camera comprising: photometering means for metering a brightness of an object based on light directed to an image pickup means of the camera; color metering means for metering a color temperature of light at a periphery of the camera; and control means for controlling a white balance so as to adjust a color balance of an output signal from said image pickup means on the basis of a difference between object brightness information produced by said photometering means and brightness converted information produced by said color metering means.

Claim 5

A white balance adjuster according to claim 2, wherein said control means controls the white balance on the basis of the object brightness information in addition to said difference.

Claim 6

A white balance adjuster according to claim 2, wherein said control means includes a plurality of white balance control tables and selection means for selecting one of said white balance control tables, the color balance of an output signal from said image pickup means being adjusted on the basis of the selected white balance control table.

Claim 7

A white balance adjuster of a camera according to claim 2 wherein said white balance control tables include first and second white balance control tables, said selection means selects the second white balance control table when ______________________________________ |Bv - Ev(log Gb)| > K where Bv: object brightness Ev(log Gb): green component brightness converted value K: constant and Bv > Kb or Ev(log Gb) > Ke where Kb, Ke: constants ______________________________________ and said selection means selects the first white balance control table when |Bv-Ev (log Gb)|≦K.

Claim 8

A white balance adjuster of a camera according to claim 2 wherein said white balance control tables include first, second and third white balance control tables, and said selection means selects the first white balance control table when ______________________________________ Bv - Ev(log Gb) > Kl where Bv: object brightness Ev(log Gb): green component brightness converted value Kl: constant ______________________________________ said selection means selects the second white balance control table when K2≦Bv-Ev(log Gb)≦K1 where K1, K2: constants and said selection means selects the third white balance control table when Bv-Ev(log Gb)<K2.