Imaging apparatus with camera shake correction function
View Patent ↗An imaging apparatus includes an image sensor that exposes a subject image by reading lines sequentially to generate an image; a detector that detects an angular velocity of a shake of the imaging apparatus; a controller that: (i) determines the detected angular velocity as an angular velocity for correction when the detected angular velocity is equal to or less than a predetermined angular velocity and, determines the predetermined angular velocity as the angular velocity for correction when the detected angular velocity is larger than the predetermined angular velocity; and (ii) corrects to reduce an influence of a shake to the image generated by the image sensor by image processing based on the determined angular velocity for correction.
1. An imaging apparatus comprising:
an image sensor that exposes a subject image by reading lines sequentially to generate an image;
a detector that detects an angular velocity of a shake of the imaging apparatus; and
a controller that performs a clipping process to limit an angular velocity for correction to be no greater than a predetermined angular velocity by:
(i) determining the detected angular velocity as the angular velocity for correction when the detected angular velocity is equal to or less than the predetermined angular velocity and, determining the predetermined angular velocity as the angular velocity for correction when the detected angular velocity is larger than the predetermined angular velocity; and
(ii) correcting to reduce an influence of a shake to the image generated by the image sensor by image processing based on an angle calculated by integrating the determined angular velocity for correction by time;
wherein the predetermined angular velocity is a positive value that changes depending on frequencies of the imaging apparatus shake.
2. The imaging apparatus according to claim 1 , wherein
the detector detects an angular velocity of a shake in a roll direction about an optical axis of the imaging apparatus as an angular velocity of a shake of the imaging apparatus,
the controller:
(i) determines the detected angular velocity of the shake in the roll direction as an angular velocity for correction when the detected angular velocity of the shake in the roll direction is equal to or less than a predetermined angular velocity and determines the predetermined angular velocity as the angular velocity for correction when the detected angular velocity of the shake in the roll direction is larger than the predetermined angular velocity, and
(ii) performs rotating correction to rotate the image about the optical axis to the image generated by the image sensor based on an angle calculated by integrating the determined angular velocity for correction by time.
3. The imaging apparatus according to claim 2 , wherein
the controller:
(i) determines a rotating angle used when the rotating correction is performed based on the determined angular velocity for correction, and
(ii) performs rotating correction to rotate the image about the optical axis based on the determined rotating angle.
4. The imaging apparatus according to claim 1 , wherein
the detector detects an angular velocity of a shake in a yaw direction as an angular velocity of a shake of the imaging apparatus,
the controller:
(i) determines the detected angular velocity of the shake in the yaw direction as an angular velocity for correction when the detected angular velocity of the shake in the yaw direction is equal to or less than a predetermined angular velocity and determines the predetermined angular velocity as the angular velocity for correction when the detected angular velocity of the shake in the yaw direction is larger than the predetermined angular velocity, and
(ii) performs moving correction to move the image in the yaw direction to the image generated by the imaging unit based on an angle calculated by integrating the determined angular velocity for correction by time.
5. The imaging apparatus according to claim 4 , wherein
the controller:
(i) determines a moving distance used when the moving correction is performed based on the determined angular velocity for correction, and
(ii) performs moving correction to move the image in the yaw direction based on the determined moving distance.
6. The imaging apparatus according to claim 1 , wherein
the detector detects an angular velocity of a shake in a pitch direction as an angular velocity of a shake of the imaging apparatus,
the controller:
(i) determines the detected angular velocity of the shake in the pitch direction as an angular velocity for correction when the detected angular velocity of the shake in the pitch direction is equal to or less than a predetermined angular velocity and determines the predetermined angular velocity as the angular velocity for correction when the detected angular velocity of the shake in the pitch direction is larger than the predetermined angular velocity, and
(ii) performs moving correction to move the image in the pitch direction to the image generated by the image sensor based on an angle calculated by integrating the determined angular velocity for correction by time.
7. The imaging apparatus according to claim 6 , wherein
the controller:
(i) determines a moving distance used when the moving correction is performed based on the determined angular velocity for correction, and
(ii) performs moving correction to move the image in the pitch direction based on the determined moving distance.
8. The imaging apparatus according to claim 1 , wherein the detector is a gyro sensor.
9. The imaging apparatus according to claim 1 , wherein
the detector includes a motion vector detector that detects a motion vector of the image generated by the image sensor, and detects an angular velocity of a shake of the imaging apparatus based on the motion vector detected by the motion vector detector.
10. The imaging apparatus according to claim 1 , wherein
the image generated by the image sensor is a moving image.