Flash control system
AssigneePENTAX Corporation
InventorsIsamu Hirai, Yoshikazu Iida
Life of this patent
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Abstract
There is provided a flash control system for a camera, which is provided with an automatic flash device which uses a predetermined appropriate amount of light to control emission of flash light, a control system that preliminarily emits the flash light, a first photometric sensors for colorimetry, a color determining system that determines the color of the object. Further, the flash control system is provided with a first colorimetric compensation value determining system which determines a first colormetric compensation value based on the determined color, and a flash control level adjusting system that adjusts the predetermined appropriate amount of light based on the first colorimetric compensation value.
Claims13
A flash control system for a camera, comprising:
- an automatic flash device that controls an amount of emission of flash light based on a result of a comparison between an amount of light sensed by a photometric sensor and a predetermined appropriate amount of light;
- a control system that preliminarily emits the flash light;
- first photometric sensors for colorimetry capable of performing colorimetry, said first photometric sensors for colorimetry sense different components of light, respectively;
- a first color determining system that determines a color of an object based on outputs of said first photometric sensors for colorimetry, the outputs of said first photometric sensors for colorimetry being obtained when said control system preliminarily emits the flash light;
- a first colorimetric compensation value determining system that determines a first colorimetric compensation value based on the color determined by said first color determining system;
- and
- a flash control level adjusting system that adjusts the predetermined appropriate amount of light based on the first colorimetric compensation value,
- wherein said automatic flash device uses the predetermined appropriate amount of light adjusted by said flash control level adjusting system to control the amount of emission of flash light.
A flash control system for a camera having a light sensor that obtains a photometry value, comprising:
- photometric sensors for colorimetry;
- a light source sensor capable of obtaining brightness data corresponding to a color rendering property of normal light;
- a first compensator that compensates for the photometry value obtained by said light sensor according to a color of an object when photographing is performed using the normal light, the color of the object being determined based on outputs of said photometric sensors for colorimetry and the brightness data;
- and
- a second compensator that compensates for a predetermined appropriate amount of light according to the color of the object when photographing is performed using flash light, the color of the object being determined based on the outputs of said photometric sensors for colorimetry when the flash light is preliminarily emitted and a predetermined compensation value corresponding to a color rendering property of the flash light.
Dependencies are inferred from the claim text.