Imaging device
An imaging device ICD, which realizes an image blurring compensation function which achieves image blurring compensation during a framing period and image blurring compensation during releasing, is provided. In the imaging device (ICD), an OIS unit control section ( 104 ) compensates image blurring occurring in an optical image by moving an optical axis of an imaging optical system ( 100 ), and compensates the image blurring by changing a position of cutout of image data outputted from an image sensor ( 106 ). An image shift amount calculation section ( 39 x, 39 y ) detects image blurring information. A system controller ( 120 ) causes the OIS unit control section ( 104 ) to mainly move the optical axis during an exposure period based on the detected image blurring information, and to mainly change the position of the cutout of the image data during a period other than the exposure period, thereby compensating image blurring which occurs in a taken image.
1. An imaging device for outputting an electric image signal of an object, the imaging device comprising:
an imaging optical system for forming an optical image of the object by using a plurality of lens units;
an image sensor for taking and converting the optical image of the object into an electric image signal;
an oscillation detection section for detecting movement information of the imaging device;
an optical image blurring compensation section for compensating image blurring occurring in the optical image by moving an optical axis of the imaging optical system;
an electronic image blurring compensation section for compensating the image blurring by changing a cutout position of image data outputted from the image sensor;
an image processing section for displaying and storing the image signal obtained by exposing the image sensor;
an operation button for starting exposure in response to an instruction by a user; and
an image blurring control section for operating mainly the electronic image blurring compensation section during a framing period from a time when the operation button is pressed halfway to a time when the operation button is pressed fully, and for operating mainly the optical image blurring compensation section during an exposure period from the time when the operation button is pressed fully to a time when the exposure is completed, in accordance with the movement information outputted from the oscillation detection section.
2. The imaging device according to claim 1 , wherein
an operation of image blurring compensation by the electronic image blurring compensation section is changed to an operation of image blurring compensation by the optical image blurring compensation section according to the instruction by the user to start exposure, and
where the movement information outputted by the oscillation detection section is an angle S degrees, a compensation angle by the electronic image blurring compensation section is smaller than S.
3. The imaging device according to claim 1 , wherein
an operation of image blurring compensation by both of the optical image blurring compensation section and the electronic image blurring compensation section is changed to an operation of image blurring compensation only by the optical image blurring compensation section according to the instruction by the user to start exposure.
4. The imaging device according to claim 1 , wherein
an operation of image blurring compensation by the electronic image blurring compensation section is changed to an operation of image blurring compensation by the optical image blurring compensation section according to the instruction by the user to start exposure, and
where the movement information outputted by the oscillation detection section is an angle S degrees, a compensation angle by the optical image blurring compensation section before the exposure is smaller than S, and a compensation angle by the optical image blurring compensation section during the exposure period is substantially equal to S.
5. The imaging device according to claim 1 , wherein the optical image blurring compensation section includes any one of an actuator which moves a lens perpendicularly to the optical axis, an actuator which moves the image sensor, and an actuator which moves the imaging optical system and the image sensor, and also includes a position detection sensor which detects a position of the actuator.
6. The imaging device according to claim 1 , wherein the image blurring control section controls movement of an image blurring compensation lens based on angle velocity information outputted from an angular velocity sensor.
7. The imaging device according to claim 1 , wherein an image blurring amount in x direction and y direction is equal to or smaller than 13 pixels in an image which is displayed on a 2.5-inch QVGA monitor every 1/30 seconds from the image data.
8. The imaging device according to claim 1 , wherein
the imaging device is a camera system which includes a camera body and an interchangeable lens which is detachable from the camera body and able to communicate with
the camera body when mounted to the camera body,
the camera body includes at least the image sensor, and
the interchangeable lens includes at least the imaging optical system and the optical image blurring compensation section.
9. The imaging device according to claim 1 , further comprising a displace section, wherein
an image blurring amount BL (inch) in an image which is displayed on the display section every 1/30 seconds satisfies following expression,
BL ≦2.5×(⅘)×( 13/320)=0.08125.