Image blur correction apparatus, method of correcting image blur, and imaging apparatus
A lens unit 20 including an imaging optical system 31 and an imaging unit 33 to generate an image signal of an imaged image is supported rotatably in a yawing direction and in a pitching direction. Based on a shake which is applied to the lens unit 20 and is detected by a shake detection unit 61 , a barycentric position of the lens unit 20 which position is calculated by a barycentric position calculation unit 62 , and a position of the lens unit 20 which position is detected by a position detection unit 46 , a driving operation by a drive unit 45 to perform rotation driving of the lens unit 20 in the yawing direction and in the pitching direction is controlled and image blur correction of the imaged image is performed. Even when the barycentric position of the lens unit varies due to a focus adjusting operation, a zooming operation, or the like, it becomes possible to perform optimal image blur correction and to improve performance in image blur correction.
1. An image blur correction apparatus comprising:
a lens unit which includes an imaging optical system and an imaging unit configured to generate an image signal of an imaged image and which is supported rotatably in a yawing direction and in a pitching direction;
a shake detection unit configured to detect a shake applied to the lens unit;
a position detection unit configured to detect a position of the lens unit;
a drive unit configured to perform rotation driving of the lens unit in the yawing direction and in the pitching direction; and
a blur correction control unit configured to correct an image blur of the imaged image by controlling the driving operation, which is performed by the drive unit, based on the shake detected by the shake detection unit, the position detected by the position detection unit, and a barycentric position of the lens unit.
2. The image blur correction apparatus according to claim 1 , wherein according to a deviation between a target position of the lens unit which position is calculated based on the shake detected by the shake detection unit and the position of the lens unit which position is detected by the position detection unit and according to the barycentric position of the lens unit, the blur correction control unit performs a combination of proportional control, differential control, and integral control and controls the driving operation in such a manner that the position of the lens unit becomes identical to the target position.
3. The image blur correction apparatus according to claim 2 , wherein in the integral control, the integral control is performed by using a correction value corresponding to the barycentric position of the lens unit.
4. The image blur correction apparatus according to claim 3 , wherein the correction value is set in such a manner to cancel a load which changes depending on the barycentric position of the lens unit.
5. The image blur correction apparatus according to claim 1 , further comprising a barycentric position calculation unit configured to calculate the barycentric position of the lens unit,
wherein the barycentric position calculation unit calculates the barycentric position based on a lens position of the lens unit and an extension state of a mirror tube of the lens unit.
6. The image blur correction apparatus according to claim 1 , further comprising an accessory detection unit configured to detect mounting of an accessory to the lens unit,
wherein the blur correction control unit controls the driving operation, which is performed by the drive unit, by using a result of the detection by the accessory detection unit.
7. A method of correcting an image blur, comprising:
detecting a shake applied to a lens unit which includes an imaging optical system and an imaging unit configured to generate an image signal of an imaged image and which is supported rotatably in a yawing direction and in a pitching direction;
detecting a position of the lens unit;
performing rotation driving of the lens unit in the yawing direction and in the pitching direction; and
correcting an image blur of the imaged image by controlling a rotation driving operation of the lens unit based on the detected shake, the detected position, and a barycentric position of the lens unit.
8. An imaging apparatus comprising:
a lens unit which includes an imaging optical system and an imaging unit configured to generate an image signal of an imaged image and which is supported rotatably in a yawing direction and in a pitching direction;
a shake detection unit configured to detect a shake applied to the lens unit;
a position detection unit configured to detect a position of the lens unit;
a drive unit configured to perform rotation driving of the lens unit in the yawing direction and in the pitching direction;
a blur correction control unit configured to correct an image blur of the imaged image by controlling the driving operation, which is performed by the drive unit, based on the shake detected by the shake detection unit, the position detected by the position detection unit, and a barycentric position of the lens unit; and
a control unit configured to control an operation of the blur correction control unit.