White balance control with choice of control dependent on brightness
First Claim
1. An image sensing apparatus comprising:
- a) first control signal forming means for forming a first control signal for controlling color balance on the basis of an output of a colorimetric sensor;
b) second control signal forming means for forming a second control signal for controlling color balance on the basis of an output of color image sensing means;
c) comparing means for comparing a first brightness signal obtained from said colorimetric sensor and a second brightness signal obtained from said image sensing means;
d) selection means for selecting one of said first and second control signals in accordance with a result of comparison effected by said comparing means; and
e) said color image sensing means for producing an image signal having a color balance controlled in accordance with said first or second control signal selected by said selection means.
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Abstract
A white balance correction circuit includes a first correction signal forming circuit for forming a first white balance correction signal on the basis of an output of a colorimetric sensor, a second correction signal forming circuit for forming a second white balance correction signal on the basis of an output of a color image sensor, and a selection circuit for selecting one of the first and second control signals in accordance with a brightness or color saturation of an object to be photographed, so that the color image sensor produces an image signal having a white balance controlled in accordance with the first or second white balance correction signal selected by the selection circuit.
33 Citations
27 Claims
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1. An image sensing apparatus comprising:
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a) first control signal forming means for forming a first control signal for controlling color balance on the basis of an output of a colorimetric sensor; b) second control signal forming means for forming a second control signal for controlling color balance on the basis of an output of color image sensing means; c) comparing means for comparing a first brightness signal obtained from said colorimetric sensor and a second brightness signal obtained from said image sensing means; d) selection means for selecting one of said first and second control signals in accordance with a result of comparison effected by said comparing means; and e) said color image sensing means for producing an image signal having a color balance controlled in accordance with said first or second control signal selected by said selection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An image sensing apparatus, comprising:
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a) color image pickup means for forming a color image signal from an image of an object; b) first means for forming a brightness information of the object on the basis of said color image signal; c) detecting means for detecting a color temperature of ambient light, said detecting means being provided separately from said color image pickup means; d) second means for forming a brightness information of the object from an output of said detecting means; e) computing means for computing the brightness informations formed by said first and second means; and f) control means for controlling a white balance of said color image signal, depending upon a result of computation effected by the computing means. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An image sensing apparatus, comprising:
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a) color image pickup means for forming a color image signal from an image of an object; b) color saturation signal forming means for forming a color saturation signal from said color image signal; c) detecting means for detecting a color temperature of ambient light, said detecting means being provided separately from said color image pickup means; and d) control means for controlling a white balance of said color image signal, by using an output of said detecting means, depending upon the color saturation signal formed by said color saturation signal forming means. - View Dependent Claims (20, 21)
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22. An image sensing apparatus, comprising:
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a) color image pickup means for forming a color image signal from an image of an object; b) brightness detecting means for detecting a brightness of an object; c) detecting means for detecting a color temperature of ambient light, said detecting means being provided separately from said color image pickup means; and d) control means for controlling a white balance of the color image signal, by selectively using one of said color image signal and the output of said detecting means, depending upon the output of said brightness detecting means. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification