Lens control apparatus and control method
AssigneeCanon Kabushiki Kaisha
InventorDaisuke Ishikawa
Life of this patent
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Abstract
A lens control apparatus and a control method thereof are disclosed. The lens control apparatus includes a microprocessor which obtains a correction defocus amount so that the correction defocus amount obtained by the microprocessor when a zoom speed is a first speed is greater than the correction defocus amount obtained by the microprocessor when a zoom speed is a second speed which is less than the first speed.
Claims22
A lens control apparatus comprising:
- a correction unit configured to correct a defocus amount and obtain a correction defocus amount;
- a target zoom lens position obtainment unit configured to obtain a target zoom lens position;
- and
- a target focus lens position obtainment unit configured to obtain a target focus lens position based on data representing a position of a focus lens corresponding to a position of a zoom lens for each object distance, the correction defocus amount, and the target zoom lens position,
- wherein, in a case that a zoom speed is a first speed, the correction unit corrects the correction defocus amount to be greater as compared with a case that the zoom speed is a second speed less than the first speed.
A lens control apparatus comprising:
- a correction unit configured to correct a defocus amount and obtain a correction defocus amount;
- a target zoom lens position obtainment unit configured to obtain a target zoom lens position;
- and
- a target focus lens position obtainment unit configured to obtain a target focus lens position based on data representing a position of a focus lens corresponding to a position of a zoom lens for each object distance, the correction defocus amount, and the target zoom lens position,
- wherein, in a case that a frame rate is a first frame rate, the correction unit corrects the correction defocus amount to be larger as compared with a case that the frame rate is a second frame rate higher than the first frame rate.
A method for controlling a lens control apparatus, the method comprising:
- correcting a defocus amount and obtaining a correction defocus amount;
- obtaining a target zoom lens position;
- obtaining a target focus lens position based on data representing a position of a focus lens corresponding to a position of a zoom lens for each object distance, the correction defocus amount, and the target zoom lens position;
- and
- in a case that a zoom speed is a first speed, correcting the correction defocus amount to be greater as compared with a case that the zoom speed is a second speed less than the first speed.
A method for controlling a lens control apparatus, the method comprising:
- correcting a defocus amount and obtaining a correction defocus amount;
- obtaining a target zoom lens position;
- obtaining a target focus lens position based on data representing a position of a focus lens corresponding to a position of a zoom lens for each object distance, the correction defocus amount, and the target zoom lens position;
- and
- in a case that a frame rate is a first frame rate, correcting the correction defocus amount to be greater as compared with a case that the frame rate is a second frame rate higher than the first frame rate.
Dependencies are inferred from the claim text.