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US 6,487,372 B2Granted
Photometry device
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsIsamu Hirai, Yoshikazu Iida
Life of this patent
Estimating the term…
Abstract
A photometry device has a normal light photometry sensor and a external light sensor. The normal light photometry sensor performs photometry with respect to an object. The external light sensor performs photometry with respect color components of the external light. An exposure amount of an object is determined based on an output of a normal light sensor. If a difference between the exposure values is greater than the predetermined value, a color judged in the colorimetry procedure is forcibly set to “colorless” and no substantial colorimetric compensation is performed. If the Bv difference is not greater than the predetermined value, the light source compensation data preliminary stored is used for the colorimetric compensation.
Claims66
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors;
- a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- a colorimetric compensation amount calculation system that determines a color of the object based on metered values output by said colorimetric sensors and compensated using the light source color compensation amount, and calculates a colorimetric compensation amount based on the judged color;
- a colorimetric compensation system that compensates for the exposure amount based on the colorimetric compensation amount,
- wherein a predetermined fixed value is used as the light source data, and
- wherein, if a difference between the exposure value obtained from the output of the external light sensor and the exposure value obtained based on the output of said normal light photometry sensor is greater than a predetermined reference value, the colorimetric compensation amount is forcibly set to zero.
6 more elements
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors, a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- a colorimetric compensation amount calculation system that determines a color of the object based on metered values output by said colorimetric sensors and compensated using the light source color compensation amount, and calculates a colorimetric compensation amount based on the judged color;
- a colorimetric compensation system that compensates for the exposure amount based on the colorimetric compensation amount,
- wherein a predetermined fixed value is used as the light source data,
- wherein, if a difference between the exposure value obtained from the output of the external light sensor and the exposure value obtained based on the output of said normal light photometry sensor is greater than a predetermined reference value, operations of said colorimetric compensation amount calculation system and said colorimetric compensation system are not performed.
5 more elements
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors;
- a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- a colorimetric compensation amount calculation system that determines a color of the object based on metered values output by said colorimetric sensors and compensated using the light source color compensation amount, and calculates a colorimetric compensation amount based on the judged color;
- a colorimetric compensation system that compensates for the exposure amount based on the colorimetric compensation amount,
- wherein a predetermined fixed value is used as the light source data, and
- wherein, the colorimetric compensation amount is compensated based on a coefficient obtained from a difference between the exposure value obtained from the output of the external light sensor and the exposure value obtained based on the output of said normal light photometry sensor.
6 more elements
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors, a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- a colorimetric compensation amount calculation system that determines a color of the object based on metered values output by said colorimetric sensors and compensated using the light source color compensation amount, and calculates a colorimetric compensation amount based on the judged color;
- a colorimetric compensation system that compensates for the exposure amount based on the colorimetric compensation amount,
- wherein a metered value of said external light sensor is used as the light source data, and
- wherein, if a difference between the exposure value obtained from the output of the external light sensor and the exposure value obtained based on the output of said normal light photometry sensor is greater than a predetermined reference value, the colorimetric compensation amount is forcibly set to zero.
5 more elements
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors;
- a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- a colorimetric compensation amount calculation system that determines a color of the object based on metered values output by said colorimetric sensors and compensated using the light source color compensation amount, and calculates a colorimetric compensation amount based on the judged color;
- a colorimetric compensation system that compensates for the exposure amount based on the colorimetric compensation amount,
- wherein a metered value of said external light sensor is used as the light source data, and
- wherein, if a difference between the exposure value obtained from the output of the external light sensor and the exposure value obtained based on the output of said normal light photometry sensor is greater than a predetermined reference value, operations of said colorimetric compensation amount calculation system and said colorimetric compensation system are not performed.
6 more elements
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors;
- a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- a colorimetric compensation amount calculation system that determines a color of the object based on metered values output by said colorimetric sensors and compensated using the light source color compensation amount, and calculates a colorimetric compensation amount based on the judged color;
- a colorimetric compensation system that compensates for the exposure amount based on the colorimetric compensation amount,
- wherein a metered value of said external light sensor is used as the light source data, and
- wherein, the colorimetric compensation amount is compensated based on a coefficient obtained from a difference between the exposure value obtained from the output of the external light sensor and the exposure value obtained based on the output of said normal light photometry sensor.
6 more elements
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors;
- a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- a colorimetric compensation amount calculation system that determines a color of the object based on metered values output by said colorimetric sensors and compensated using the light source color compensation amount, and calculates a colorimetric compensation amount based on the judged color;
- a colorimetric compensation system that compensates for the exposure amount based on the colorimetric compensation amount,
- wherein one of the metered value of said external light sensor and a predetermined fixed value is selected as the light source data in accordance with a difference between the exposure value obtained from the output of the external light sensor and the exposure-value obtained based on the output of said normal light photometry sensor.
5 more elements
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors;
- a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- a colorimetric compensation amount calculation system that determines a color of the object based on the metered values output by said colorimetric sensors and compensated using the light source color compensation amount, and calculates a colorimetric compensation amount based on the judged color;
- a colorimetric compensation system that compensates for the exposure amount based on the colorimetric compensation amount,
- wherein a value within a range between the metered value of said external light sensor and a predetermined fixed value is determined as the light source data in accordance with a difference between the exposure value obtained from the output of the external light sensor and the exposure value obtained based on the output of said normal light photometry sensor.
5 more elements
A photometry device for a camera, comprising:
- a normal light sensor that performs a photometry operation with respect to an object;
- an exposure amount determining system that determines an exposure amount of an object in accordance with an output-of said normal light sensor;
- a plurality of colorimetric sensors having spectral sensitivity characteristics different from each other, said plurality of colorimetric sensors performing a colorimetric operation with respect to an image of the object through a lens of said camera;
- an external light sensor that measures external light illuminating the object at spectral sensitivity characteristics corresponding to each of said plurality of colorimetric sensors;
- a light source color compensation amount calculation system that calculates a light source color compensation amount based on light source data;
- and
- a colorimetric compensation system that compensates for the exposure amount, procedures for compensating for the exposure amount being varied depending on a difference between the exposure value obtained from the output of the external light sensor and the exposure value obtained based on the output of said normal light photometry sensor.
4 more elements
Dependencies are inferred from the claim text.