JP2018156036A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device that enables a natural image tremor correction to be achieved when a lens forming a rotationally asymmetric image such as an anamorphic lens is mounted.SOLUTION: Imaging devices (10 and 100) comprise: an image pick-up element (110) that images a subject image formed via a lens to generate image data; an element activation unit (181) that causes, in an in-plane vertical to an optical axis, the image pick-up element a translation movement in orthogonal two directions and a rotational movement around the optical axis to thereby makes image tremor corrections; and a correction processing unit (183) that acquires tremor information indicative of an amount of tremor of an own device, and controls the element activation unit on the basis of the tremor information. The correction processing unit (183) has a specific mode that is used when the subject image is formed on the image pick-up element via a specific lens forming a rotationally asymmetric image, and in the specific mode, is configured to control the element activation unit so as to prohibit the rotational movement of the image pick-up element when correcting the image tremor.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to an imaging apparatus that has an image blur correction function by driving an imaging element and can capture a subject image via a lens on which a rotationally asymmetric image is formed, such as an anamorphic lens.

  An anamorphic lens is a lens that can form an image by converting the aspect ratio of a subject image from 1: 1 to 1: k.

  Patent Document 1 discloses an imaging apparatus that can shoot images of various aspect ratios using an anamorphic lens, and can always maintain a certain level of control ability regardless of the aspect ratio of the images. . Specifically, Patent Document 1 discloses an imaging unit that converts an optical image into an electrical signal and outputs the image as an image signal, a conversion unit that converts an aspect ratio of the captured image, and a control unit that is involved in obtaining the image signal. An image pickup apparatus having a correction unit that corrects the parameters according to the conversion characteristics of the conversion unit is disclosed. With this configuration, since the parameters of the control means involved in obtaining the image signal are corrected based on the aspect ratio, a constant level of control capability can always be maintained regardless of the aspect ratio image.

  Further, the imaging apparatus of Patent Document 1 detects a motion vector of an image, and when detecting the motion vector, the vector of the horizontal direction component is determined based on a coefficient k indicating an aspect ratio conversion characteristic of the anamorphic lens. Correct by multiplying by k. Then, image blur correction is performed according to the corrected motion vector.

Japanese Patent No. 3278206

  The present disclosure realizes appropriate image blur correction when a lens that forms a rotationally asymmetric image such as an anamorphic lens is mounted in an imaging apparatus having an image blur correction function by driving an image sensor. An imaging device is provided.

  An imaging apparatus according to the present disclosure includes an imaging element that captures a subject image formed through a lens to generate image data, and a translational movement of the imaging element in two directions orthogonal to each other in a plane perpendicular to the optical axis. By rotating and moving around the optical axis, an element drive unit that performs image shake correction, and a correction processing unit that acquires shake information indicating the shake amount of the device itself and controls the element drive unit based on the shake information are provided. Prepare. The correction processing unit has a specific mode used when a subject image is formed on the image sensor via a specific lens that forms a rotationally asymmetric image. In the specific mode, the correction processing unit controls the element driving unit so as to prohibit the rotational movement of the imaging element during image blur correction.

  According to the present disclosure, in an imaging apparatus having an image blur correction function by driving an imaging device, when a lens that forms a rotationally asymmetric image such as an anamorphic lens is attached, the imaging device rotates. Image blur compensation is prohibited. Thereby, when a lens for forming a rotationally asymmetric image is attached, an appropriate image blur correction function can be realized.

1 is a perspective view of a digital camera with an anamorphic lens attached according to Embodiment 1. FIG. Diagram for explaining the function of anamorphic lens Block diagram showing the internal configuration of the digital camera FIG. 2 is a block diagram showing a configuration of a BIS processing unit (configuration related to an image blur correction function in the yaw direction) in the digital camera according to the first embodiment. 1 is a block diagram showing a configuration of a BIS processing unit (configuration related to an image shake correction function in the pitch direction) in the digital camera of Embodiment 1. FIG. 1 is a block diagram showing a configuration of a BIS processing unit (configuration related to an image blur correction function in a roll direction) in the digital camera of Embodiment 1. FIG. The figure for demonstrating the function of 3D lens The figure for demonstrating the example of the attachment aspect of a special lens (for example, anamorphic lens)

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings as appropriate. However, in the detailed description, unnecessary portions of the description related to the related art and substantially the same configuration may be omitted. This is to simplify the explanation. Also, the following description and the accompanying drawings are disclosed to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter of the claims.

(Embodiment 1)
FIG. 1 is a perspective view of the digital camera according to the first embodiment of the present disclosure. The digital camera 10 includes an interchangeable lens 200 and a camera body 100. An anamorphic lens 300 is attached to the tip of the interchangeable lens 200. The digital camera 10 and the camera body 100 are examples of the imaging device of the present disclosure. The anamorphic lens 300 is an example of a specific lens.

  An anamorphic lens is a lens that forms an image by converting the aspect ratio of a subject image. When an object such as that shown in FIG. 2A is imaged with a normal lens, the image is formed without changing the aspect ratio of the object as shown in FIG. 2B. On the other hand, when an object is imaged with an anamorphic lens, as shown in FIG. 2C, an image compressed in the horizontal direction by 1 / k times (1/2 times in the present embodiment). Is imaged. That is, an image whose aspect ratio is converted to 1: k (in this example, k = 2) is formed. Such an anamorphic lens is generally used when generating a cinema image.

  As will be described later, the digital camera 10 according to the present embodiment has a shake correction function that reduces the influence of camera shake on a captured image in each of the interchangeable lens 200 and the camera body 100. Specifically, in the interchangeable lens 200, the shake is corrected by moving the shake correction lens in a plane perpendicular to the optical axis of the optical system in accordance with the shake detected by the shake detection unit such as a gyro sensor. Can be reduced. Hereinafter, the function of correcting the blur by shifting the correction lens in the interchangeable lens is referred to as an “OIS (Optical Image Stabilizer) function”. On the other hand, in the camera body 100, the image sensor such as a CCD is moved in a plane perpendicular to the optical axis of the optical system according to the low-frequency region of the shake detected by the shake detection unit. The influence can be reduced. Hereinafter, the function of correcting the blur by shifting the image sensor in the camera body is referred to as a “BIS (Body Image Stabilizer) function”.

  The digital camera 10 according to the present embodiment performs special control so that an appropriate image blur correction effect is obtained when a special lens such as an anamorphic lens is attached (details will be described later).

  In the following description, the X direction and the Y direction correspond to the horizontal direction and the vertical direction of the image sensor in the digital camera (see FIG. 1). The yaw direction is the rotational direction in the X direction, the pitch direction is the rotational direction in the Y direction, and the roll direction is the rotational direction of rotation about the optical axis (see FIG. 1).

[1. Constitution]
FIG. 3 is a block diagram illustrating a configuration of the digital camera 10 according to the first embodiment of the present disclosure. The digital camera 10 includes a camera body 100 and an interchangeable lens 200 that can be attached thereto.

[1-1. Camera body]
The camera body 100 includes a CCD 110, a liquid crystal monitor 120, a camera controller 140, a body mount 150, a power source 160, and a card slot 170.

  The camera controller 140 controls the operation of the entire digital camera by controlling components such as the CCD 110 in accordance with an instruction from the release button 130. The camera controller 140 transmits a vertical synchronization signal to the timing generator 112. In parallel with this, the camera controller 140 generates an exposure synchronization signal. The camera controller 140 periodically transmits the generated exposure synchronization signal to the lens controller 240 via the body mount 150 and the lens mount 250. The camera controller 140 uses the DRAM 141 as a work memory during control operations and image processing operations. The camera controller 140 includes a CPU, MPU, FPGA, ASIC, and the like.

  The CCD 110 captures a subject image incident through the interchangeable lens 200 and generates image data. The generated image data is digitized by the AD converter 111. The digitized image data is subjected to predetermined image processing by the camera controller 140. The predetermined image processing includes, for example, gamma correction processing, white balance correction processing, scratch correction processing, YC conversion processing, electronic zoom processing, and JPEG compression processing.

  The CCD 110 operates at a timing controlled by the timing generator 112. Examples of the operation of the CCD 110 include a still image capturing operation and a through image capturing operation. The through image is mainly a moving image, and is displayed on the liquid crystal monitor 120 in order for the user to determine a composition for capturing a still image.

  The liquid crystal monitor 120 displays an image indicated by the display image data image-processed by the camera controller 140. The liquid crystal monitor 120 can selectively display both moving images and still images.

  The card slot 170 can be loaded with a memory card 171 and controls the memory card 171 based on the control from the camera controller 140. The digital camera 10 can store image data in the memory card 171 and read image data from the memory card 171.

  The power supply 160 supplies power to each element in the digital camera 10.

  The body mount 150 can be mechanically and electrically connected to the lens mount 250 of the interchangeable lens 200. The camera body 100 and the interchangeable lens 200 can transmit and receive data via connectors mounted on the body mount 150 and the lens mount 250. The body mount 150 transmits the exposure synchronization signal received from the camera controller 140 to the lens controller 240 via the lens mount 250. Further, other control signals received from the camera controller 140 are transmitted to the lens controller 240 via the lens mount 250. The body mount 150 transmits a signal received from the lens controller 240 via the lens mount 250 to the camera controller 140. The body mount 150 also supplies power from the power source 160 to the entire interchangeable lens 200 via the lens mount 250.

  Further, the camera body 100 is configured to realize a BIS function (function to correct image blur by shifting the CCD 110), a gyro sensor 184 (blur detection means) that detects a blur of the camera body 100, an acceleration sensor 185, And a BIS processing unit 183 that controls the shake correction processing based on the outputs of the gyro sensor 184 and the acceleration sensor 185. Furthermore, the camera body 100 includes a CCD drive unit 181 that moves the CCD 110 and a position sensor 182 that detects the position of the CCD 110.

  The CCD driving unit 181 can move the CCD 110 in the X direction, the Y direction, and the roll direction in a plane parallel to the imaging surface. Therefore, the CCD drive unit 181 includes an actuator for moving the CCD 110 in the X direction, the Y direction, and the roll direction. The actuator can be realized by a magnet and a flat coil, for example.

  The position sensor 182 is a sensor that detects the position of the CCD 110 in a plane perpendicular to the optical axis of the optical system. The position sensor 182 can be realized by a magnet and a Hall element, for example. For example, by using three position sensors, it is possible to detect movement amounts in the X direction, the Y direction, and the rotation direction.

  The gyro sensor 184 detects a shake of the camera body 100 in the yaw direction, the pitch direction, and the roll direction based on an angular change per unit time of the digital camera 10, that is, an angular velocity. The gyro sensor 184 outputs an angular velocity signal indicating the detected shake amount (angular velocity). The acceleration sensor 185 detects the acceleration of the digital camera 10 in the X direction and the Y direction.

  The BIS processing unit 183 controls the CCD driving unit 181 based on signals from the gyro sensor 184, the acceleration sensor 225, and the position sensor 182 to make the CCD 110 a surface perpendicular to the optical axis so as to cancel the camera body 100 shake. This is a control circuit for shifting in the three-axis direction. Here, the image sensor provided in the camera body 100 is a CCD, but another image sensor such as a CMOS sensor may be used. The CCD drive unit 181 may use a stepping motor, an ultrasonic motor, or other actuators. When a stepping motor is used as the actuator, open control can be performed, and accordingly, a position sensor can be dispensed with.

[1-2. interchangeable lens]
The interchangeable lens 200 includes an optical system, a lens controller 240, and a lens mount 250. The optical system includes a zoom lens 210, an OIS (Optical Image Stabilizer) lens 220, and a focus lens 230.

  The zoom lens 210 is a lens for changing the magnification of a subject image formed by the optical system. The zoom lens 210 is composed of one or a plurality of lenses. The zoom lens driving unit 211 includes a zoom ring or the like that can be operated by the user, transmits the operation by the user to the zoom lens 210, and moves the zoom lens 210 along the optical axis direction of the optical system.

  The focus lens 230 is a lens for changing the focus state of the subject image formed on the CCD 110 by the optical system. The focus lens 230 is composed of one or a plurality of lenses.

  The focus lens driving unit 233 includes a motor, and moves the focus lens 230 along the optical axis of the optical system based on the control of the lens controller 240. The focus lens driving unit 233 can be realized by a DC motor, a stepping motor, a servo motor, an ultrasonic motor, or the like.

  The OIS lens 220 is a lens for correcting blurring of a subject image formed by the optical system of the interchangeable lens 200 in the OIS function (function for correcting image blur by shifting the OIS lens 220). The OIS lens 220 moves in a direction that cancels out the blur of the digital camera 10, thereby reducing the blur of the subject image on the CCD 110. The OIS lens 220 is composed of one or a plurality of lenses. Under the control of the OIS processing unit 223, the OIS driving unit 221 shifts the OIS lens 220 within a plane perpendicular to the optical axis of the optical system.

  The OIS driving unit 221 can move the OIS lens 220 in the X direction and the Y direction within a plane perpendicular to the optical axis. The OIS driving unit 221 includes an actuator for moving the OIS lens 220 in the X direction and the Y direction. The actuator can be realized by a magnet and a flat coil, for example. The OIS driving unit 221 may use an ultrasonic motor or other actuator.

  The position sensor 222 is a sensor that detects the position of the OIS lens 220 in a plane perpendicular to the optical axis of the optical system. The position sensor 222 can be realized by a magnet and a Hall element, for example. For example, the amount of movement in the X direction and the Y direction can be detected by using two position sensors.

  The OIS processing unit 223 is a control circuit for controlling the OIS driving unit 221 based on the outputs of the position sensor 222, the acceleration sensor 225, and the gyro sensor 224.

  The gyro sensor 224 detects the shake of the zoom lens 210 in the yaw direction and the pitch direction based on the angle change per unit time of the digital camera 10, that is, the angular velocity. The gyro sensor 224 outputs an angular velocity signal indicating the detected shake amount (angular velocity). In the present embodiment, a gyro sensor is used as the angular velocity detection means, but other sensors can be used instead of the gyro sensor as long as the shake of the digital camera 10 can be detected. The acceleration sensor 225 detects the acceleration of the digital camera 10 in the X direction and the Y direction.

  The camera controller 140 and the lens controller 240 may be configured with a hard-wired electronic circuit or a microcomputer using a program. The lens controller 240 includes a CPU, MPU, FPGA, ASIC, and the like.

[1-3. BIS processing section]
A functional configuration of the BIS processing unit 183 in the camera body 100 will be described with reference to FIGS. The BIS processing unit 183 detects angular shake in the yaw, pitch, and roll directions of the digital camera 10 based on the detection signal from the gyro sensor 184, and further translates in X and Y directions based on the detection signal from the acceleration sensor 185. To detect. Then, by moving the CCD 110 in the X direction, the Y direction, and the roll direction based on the detected values of the angular blur and the translational blur, the image blur caused by the blur of the digital camera 10 (that is, the camera body 100) is canceled. .

  FIG. 4 is a block diagram illustrating a configuration of the BIS processing unit 183 regarding shake correction in the X direction. Regarding the shake correction in the X direction, the BIS processing unit 183 is an HPF (High Pass Filter) 301, an integrator 302, a phase detector, and a system that detects angular shake in the yaw direction based on the detection signal from the gyro sensor 184. A compensation unit 303 and a multiplier 304 are provided. The BIS processing unit 183 includes an HPF 311, integrators 312 and 313, and a phase compensation unit 314 as a system that detects translational shake based on a detection signal from the acceleration sensor 185. Further, the BIS processing unit 183 includes an adder 305, a multiplier 306, and a PID control unit 307. That is, the shake correction in the X direction is controlled based on the detection signal for the shake in the yaw direction of the gyro sensor 184 and the detection signal for the shake in the X direction of the acceleration sensor 185.

  FIG. 5 is a block diagram illustrating a configuration of the BIS processing unit 183 related to the shake correction in the Y direction. Regarding the shake correction in the Y direction, the BIS processing unit 183 is different from the configuration shown in FIG. 4 in that the multiplier 306 is not provided. That is, the shake correction in the Y direction is controlled based on the detection signal for the shake in the pitch direction of the gyro sensor 184 and the detection signal for the shake in the Y direction of the acceleration sensor 185.

  FIG. 6 is a block diagram illustrating a configuration of the BIS processing unit 183 related to shake correction in the roll direction. Regarding the shake correction in the roll direction, the BIS processing unit 183 includes an HPF 301, an integrator 302, and a phase compensation unit 303 as a system that detects an angular shake in the roll direction based on a detection signal in the roll direction of the gyro sensor 184. Prepare. However, the BIS processing unit 183 does not include a system that detects translational shake based on the detection signal of the acceleration sensor 185. In other words, the roll direction shake correction is controlled based on the roll direction shake detection signal of the gyro sensor 184.

[2. Operation]
The blur correction process in the digital camera 10 configured as described above will be described. In the following description of the operation, for convenience of explanation, it is assumed that the shake correction of the digital camera 10 is performed by the shake correction function (BIS function) on the camera body 100 side, and the shake correction function (OIS function) in the interchangeable lens 200 is not activated. explain. Further, it is assumed that a shake of the digital camera 10, that is, the camera body 100 is detected based on signals from the gyro sensor 184 and the acceleration sensor 185 provided in the camera body 100.

  As shown in FIG. 1, when an anamorphic lens 300 is mounted on the digital camera 10, the image formed on the CCD 110 is 1 / X in the X direction (horizontal direction) as shown in FIG. The image is reduced by a factor of two. At this time, the amount of blurring in the X direction (horizontal direction) in the image on the CCD 110 caused by the blurring of the digital camera 10 is also halved. For this reason, if blur correction in the X direction is executed based on detection signals from the normal gyro sensor and acceleration sensor, the CCD 110 is excessively moved and an unnatural moving image is generated.

  In order to solve this problem, the digital camera 10 according to the present embodiment has a special operation mode (hereinafter referred to as “anamorphic lens mode”) as a mode set with the anamorphic lens 300 attached. Have. The setting of the anamorphic lens mode is manually set by the user on the menu screen, for example. The mode set in the digital camera 10 can be recognized by the mode setting signal.

  In the anamorphic lens mode, the digital camera 10 executes a shake correction process different from normal. Specifically, in the anamorphic lens mode, control is performed so as not to correct the roll direction of the CCD 110. Further, the gain for the control signal indicating the amount of movement of the CCD 110 in the X direction is set according to the aspect ratio (1: k) of the anamorphic lens. As described above, when an anamorphic lens is mounted, by performing special blur correction, it is possible to perform blur correction suitable for an image formed by the anamorphic lens.

  Hereinafter, correction processing in the X direction, the Y direction, and the roll direction by the BIS processing unit 183 will be described.

[2-1. Shake correction processing in X direction]
With reference to FIG. 4, the operation of the BIS processing unit 183 regarding blur correction in the X direction (horizontal direction) will be described.

  A detection signal indicating the angular velocity of the shake in the yaw direction from the gyro sensor 184 is input to the HPF 301. The HPF 301 blocks a predetermined low frequency component included in the input detection signal. Thereby, the drift component in the detection signal indicating the angular velocity of the shake (vibration) in the yaw direction input from the gyro sensor 184 is blocked.

  The integrator 302 integrates the signal indicating the angular velocity of the shake in the yaw direction input from the HPF 301 and generates a signal indicating the angle of the shake in the yaw direction.

  The phase compensation unit 303 corrects a phase delay caused by the CCD driving unit 181 and the like with respect to the signal input from the integrator 302.

  The multiplier 304 multiplies the signal input from the phase compensation unit 303 by the first gain α. The first gain α is determined according to the focal length or the like.

  On the other hand, a signal indicating acceleration in the X direction from the acceleration sensor 185 is input to the HPF 311. The HPF 311 blocks a predetermined low frequency component in the input acceleration signal in order to block the drift component. The integrator 312 integrates the signal indicating the acceleration input from the HPF 311 and generates a signal indicating the velocity in the X direction. Further, the integrator 313 integrates the signal indicating the velocity input from the integrator 312, generates a signal indicating the position in the X direction, and outputs the signal to the phase compensation unit 314.

  The phase compensation unit 314 corrects a phase delay caused by the CCD driving unit 181 and the like with respect to the signal input from the integrator 313. As a result, a signal indicating translational blur in the X direction is generated.

  The multiplier 315 multiplies the signal input from the phase compensation unit 314 by a gain γ resulting from image magnification or the like.

  The adder 305 adds the signal indicating the angular blur in the yaw direction input from the multiplier 304 and the signal indicating the translational blur in the X direction input from the multiplier 315, and the blur correction amount in the X direction of the CCD 110. (Hereinafter referred to as a “first blur correction signal”).

  The first blur correction signal is input to the multiplier 306. The multiplier 306 multiplies the first blur correction signal from the adder 305 by the second gain β. Here, the second gain β is set to the compression rate (1 / k) of the anamorphic lens in the X direction when the mode setting signal indicates “anamorphic lens mode”. In the present embodiment, since the compression rate in the X direction of the anamorphic lens 300 is ½, the second gain β is set to ½. As a result, the amount of movement of the CCD 110 in the X direction for blur correction is limited, and excessive correction can be suppressed. On the other hand, when the mode setting signal does not indicate “anamorphic lens mode”, the multiplier 306 sets the coefficient β to 1 for the shake correction signal from the adder 305. As a result, the output from the adder 305 is output as it is.

  The first blur correction signal from the multiplier 306 is input to the PID control unit 307. The PID control unit 307 performs PID control based on the difference between the first blur correction signal and the current position information of the CCD 110 input from the position sensor 182, and generates a drive signal for the CCD drive unit 181. The CCD drive unit 181 drives the CCD 110 in the X direction based on the drive signal.

  As described above, when the mode is set to “anamorphic lens mode”, the BIS processing unit 183 compresses the anamorphic lens with respect to the blur correction signal that defines the blur correction amount in the X direction. The gain β is set according to the rate. Thereby, in the digital camera 10 to which the anamorphic lens is attached, excessive correction in the horizontal direction is not performed, and appropriate blur correction is realized.

[2-2. Shake correction processing in Y direction]
With reference to FIG. 5, the operation of the BIS processing unit 183 related to the blur correction function in the Y direction (vertical direction) will be described.

  A detection signal indicating the angular velocity of the shake in the pitch direction is input to the HPF 301 from the gyro sensor 184. The HPF 301 blocks a predetermined low frequency component included in the input detection signal. Thereby, the drift component in the detection signal indicating the angular velocity of the shake (vibration) in the pitch direction input from the gyro sensor 184 is blocked.

  The integrator 302 integrates the signal indicating the angular velocity of the shake in the pitch direction input from the HPF 301 and generates a signal indicating the angle of the shake in the pitch direction.

  The phase compensation unit 303 corrects a phase delay caused by the CCD driving unit 181 and the like with respect to the signal input from the integrator 302.

  The multiplier 304 multiplies the signal input from the phase compensation unit 303 by the first gain α. The first gain α is determined according to the focal length or the like.

  On the other hand, a signal indicating acceleration in the Y direction from the acceleration sensor 185 is input to the HPF 311. The HPF 311 blocks a predetermined low frequency component in the input acceleration signal in order to block the drift component. The integrator 312 integrates the signal indicating the acceleration input from the HPF 311 and generates a signal indicating the velocity in the Y direction. Further, the integrator 313 integrates the signal indicating the velocity input from the integrator 312, generates a signal indicating the position in the Y direction, and outputs the signal to the phase compensation unit 314.

  The phase compensation unit 314 corrects a phase delay caused by the CCD driving unit 181 and the like with respect to the signal input from the integrator 313. Thereby, a signal indicating translational blur in the Y direction is generated.

  The multiplier 315 multiplies the signal input from the phase compensation unit 314 by a gain γ resulting from image magnification or the like.

  The adder 305 adds the signal indicating the angular shake in the pitch direction input from the multiplier 304 and the signal indicating the translational shake in the Y direction input from the multiplier 315 to add a signal indicating the blur correction amount in the Y direction ( (Hereinafter referred to as “second blur correction signal”).

  The second shake correction signal is input to the PID control unit 307. The PID control unit 307 performs PID control based on the difference between the input second shake correction signal and the current position information of the CCD 110 input from the position sensor 182, and generates a drive signal for the CCD drive unit 181. The CCD drive unit 181 drives the CCD 110 in the Y direction based on the drive signal.

  As described above, the correction in the Y direction of the CCD 110 is performed in the same correction process between the anamorphic lens mode and the other modes.

[2-3. Shake correction processing in roll direction]
With reference to FIG. 6, the operation of the BIS processing unit 183 relating to the blur correction in the roll direction will be described.

  A detection signal indicating the angular velocity of the shake in the roll direction from the gyro sensor 184 is input to the HPF 301. The HPF 301 blocks a predetermined low frequency component included in the input detection signal.

  The integrator 302 integrates the signal indicating the angular velocity of the shake in the roll direction input from the HPF 301 and generates a signal indicating the angle of the shake in the roll direction.

  The phase compensation unit 303 corrects a phase delay caused by the CCD driving unit 181 and the like with respect to the signal input from the integrator 302.

  A signal from the phase compensation unit 303 is input to the PID control unit 307. The PID control unit 307 performs PID control based on the difference between the input signal and the current position information of the CCD 110 input from the position sensor 182, and generates a drive signal for the CCD drive unit 181. At this time, when the mode setting signal does not indicate “anamorphic lens mode”, the PID control unit 307 generates a drive signal for moving the CCD 110 in the roll direction to the CCD drive unit 181. However, when the mode setting signal indicates “anamorphic lens mode”, the PID control unit 307 does not generate a driving signal for moving the CCD 110 in the roll direction with respect to the CCD driving unit 181 or the driving signal itself. The drive signal itself is set to 0 by multiplying 0 by 0. That is, correction in the roll direction is not performed.

  As described above, in the anamorphic lens mode, control is performed so that the CCD 110 is not moved (rotated) in the roll direction at the time of blur correction. This is because an image formed by the anamorphic lens is a rotationally asymmetric image, and thus a distorted image is formed when the rotation correction is performed.

As described above, in the present embodiment, when the anamorphic lens mode is set, the correction amount for blur correction in the X direction (horizontal direction) is changed according to the compression rate of the anamorphic lens. In addition, shake correction in the roll direction is not performed. Thereby, even if an anamorphic lens is attached, appropriate blur correction can be realized.
Note that the calculation order and filter configuration for signal processing are not limited to these configurations, and other filters and configurations may be used.

[3. Effect, etc.]
The digital camera 10 or the camera body 100 (an example of an imaging device) according to the present embodiment includes a CCD 110 (an example of an imaging device) that captures a subject image formed via the interchangeable lens 200 and generates image data, and a CCD 11110. In a plane perpendicular to the optical axis, a CCD drive unit 181 (an example of an element drive unit) that performs image blur correction by translational movement in the X and Y directions and rotational movement about the optical axis, and a digital camera 10 or a BIS processing unit 183 (an example of a correction processing unit) that acquires blur information (for example, outputs of the gyro sensor 184 and the acceleration sensor 185) indicating the blur amount of the camera body 100 and controls the CCD driving unit 181 based on the blur information. And). The BIS processing unit 183 has an anamorphic lens mode (an example of a specific mode) used when a subject image is formed on the CCD 110 via the anamorphic lens 300 (an example of a specific lens). In the anamorphic lens mode, the BIS processing unit 183 controls the CCD driving unit 181 so as to prohibit the rotational movement of the CCD 110 during image blur correction.

  With this configuration, when an image is formed on the CCD 110 via a lens that forms a rotationally asymmetric image such as an anamorphic lens, appropriate image blur correction can be performed.

  In addition, the BIS processing unit 183 calculates the amount of translational movement of the CCD 110 in the X direction for image blur correction from detection signals from the gyro sensor 184 and the acceleration sensor 185. The BIS processing unit 183 sets the calculated movement amount to 1 times in modes other than the anamorphic lens mode, and sets the calculated movement amount to 1 / k times in the anamorphic lens mode (k Is the aspect ratio of the image formed by the anamorphic lens). Thereby, when an anamorphic lens is attached, excessive image blur correction in the X direction can be suppressed.

(Other embodiments)
The idea of the above embodiment is not limited to the embodiment described above. Various embodiments may be envisaged. Hereinafter, other embodiments to which the idea of the above embodiments can be applied will be described.

  In the above embodiment, the CCD is used as an example of the image sensor, but another type of image sensor (for example, a CMOS image sensor) may be used.

  In the above embodiment, the shake of the digital camera 10 (that is, the camera body 100) is detected by the gyro sensor 184 and the acceleration sensor 185 in the camera body 100. However, the gyro sensor 184 and the acceleration sensor 185 in the interchangeable lens 200 are detected. Thus, the shake of the digital camera 10 (that is, the camera body 100) may be detected.

  In the above embodiment, the setting of the anamorphic lens mode is realized by manual setting by the user on the menu screen. At this time, as the information indicating the compression ratio (1 / k), a value of k = 1 or more may be arbitrarily input. Accordingly, it is possible to deal with interchangeable lenses having a compression rate other than (1/2). Further, a separate automatic acquisition mode is provided, and the setting of the anamorphic lens mode is performed by the lens controller 140 transmitting to the camera controller 140 via the lens mount 250 and the body mount 150 when an interchangeable lens is attached. It may be done automatically. In the automatic acquisition mode, the camera controller 140 may ask whether the lens mounted on the lens controller 140 is an anamorphic lens and automatically recognize it. Furthermore, in the automatic acquisition mode, information indicating the compression rate (1 / k) of the anamorphic lens may be automatically acquired from the interchangeable lens. In the automatic acquisition mode, k = 2 is set when information indicating the compression ratio (1 / k) cannot be acquired from the interchangeable lens.

  In the above embodiment, the image blur correction function is realized only by the BIS processing unit 183 on the camera body 100 side. The image blur correction function may be realized by sharing the BIS processing unit 183 and the OSI processing unit 221. For example, the image blur correction may be performed by moving the OIS lens 220 in the X and Y directions by the OSI processing unit 221 on the interchangeable lens side and moving the CCD 110 in the roll direction by the BIS processing unit 183 on the camera body side. In this case, the OIS processing unit 221 sets the gain of the driving signal in the X direction of the OIS lens 220 calculated based on the blur amount of the digital camera to “1” in modes other than the anamorphic lens mode. In the morphic lens mode, it is set to 1 / k.

  In the above embodiment, the shake detection unit is configured by the gyro sensor 184 and the acceleration sensor 185, but the shake detection unit may be configured by only one of them. For example, the shake detection unit may be configured by only the gyro sensor 184.

  In the above embodiment, the gyro sensor is not limited to a sensor that outputs an analog signal, and may be a sensor that outputs a digital signal. Further, the detection element is not limited to quartz or the like, and may be any detection means element. As for the gyro sensor and the acceleration sensor, individual sensors may be used for each detection axis.

  In the above embodiment, an anamorphic lens is used as an example of the specific lens, but the special lens is not limited to this. The specific lens may be a lens that forms a rotationally asymmetric image. For example, a 3D lens may be used. Here, the 3D lens has two optical systems arranged in parallel, and forms an image 55 in which two subject images having parallax are arranged on the same subject 50 as shown in FIG. It is a lens. In this case, the second gain β is set to 1.

  In the above embodiment, the configuration in which the anamorphic lens 300 is attached to the tip of the interchangeable lens 200 as shown in FIG. 8A has been described, but the anamorphic lens 300 is shown in FIG. 8B. As described above, it may be directly attached to the camera body 100 as an interchangeable lens. In this case, when the lens information can be acquired from the anamorphic lens by communication, the camera controller 140 recognizes from the lens information that the lens attached to the camera body 100 is an anamorphic lens, and changes the operation mode to the anamorphic lens. A morphic lens may be automatically set.

  In the above-described embodiment, the configuration in which the horizontal correction amount is controlled based on the aspect ratio of the anamorphic lens 300 in the image blur correction function has been described. However, the idea of the present disclosure is limited to the control of image blur correction. Not. Even when an image is captured through a special lens such as a 3D lens, if the image sensor is driven in the same way as in normal control, the image formation position in the horizontal direction is shifted from the desired position, and an appropriate image is obtained. The problem of not being able to occur. That is, when an image is captured through a special lens that forms a rotationally asymmetric image, the image sensor is driven so as to prohibit rotational movement of the image sensor during image capture, as in the above embodiment. Is preferably controlled. Further, based on the optical characteristics of the special lens, it is preferable to set the horizontal movement amount of the image sensor to 1 / k times (k is the aspect ratio of the image formed by the anamorphic lens. In this case, k = 1.) In this way, by restricting the driving of the image sensor, the imaging position is controlled to a desired position according to the optical characteristics of the special lens, so that an image with a desired image quality can be obtained.

  In the above embodiment, a digital camera (or a camera body) is used as an example of the imaging device, but the imaging device is not limited to these. The imaging device captures a subject image via a special lens such as a camcorder, a mobile phone, a smartphone, a tablet terminal, etc. that has an image blur correction function and forms a rotationally asymmetric image such as an anamorphic lens. Any electronic device can be used.

  In the above embodiment, the effect during moving image shooting has been described as the anamorphic mode, but the mode is not limited to this. Any mode can be used as long as an effect can be expected, such as a live view through display and transfer mode and a still image shooting mode.

(This disclosure)
As described above, the above embodiment discloses the following idea.

(1) an image sensor (110) that captures a subject image formed via a lens and generates image data;
An element driving unit (181) that performs image blur correction by moving the imaging element in a plane perpendicular to the optical axis in two orthogonal directions and rotating around the optical axis;
A correction processing unit (183) that acquires blur information indicating a blur amount of the device itself and controls the element driving unit based on the blur information;
An imaging device (10, 100) comprising:

  The correction processing unit (183) has a specific mode used when a subject image is formed on the image sensor via a specific lens that forms a rotationally asymmetric image. The element driving unit is controlled so as to prohibit the rotational movement of the imaging element.

  (2) In the imaging device of (1), the specific lens is, for example, an anamorphic lens that forms an image by converting the aspect ratio of the subject image to 1: k.

  (3) In the imaging device of (2), the correction processing unit may calculate the amount of translational movement of the imaging element in a specific direction for image blur correction from the amount of blur indicated by the blur information. The correction processing unit may set the calculated movement amount to 1 times in modes other than the specific mode, and may set the calculated movement amount to 1 / k times in the specific mode.

  (4) In the imaging device of (1), the specific lens is a 3D lens that includes two optical systems arranged side by side in a specific direction, and images from the respective optical systems are formed in two adjacent regions. There may be.

  (5) In the imaging device of (4), the correction processing unit may calculate the amount of translational movement of the imaging element in a specific direction for image blur correction from the amount of blur indicated by the blur information. The correction processing unit may set the calculated movement amount to 1 times in modes other than the specific mode, and may set the calculated movement amount to 1/2 times in the specific mode.

  (6) In the imaging device of (1), the imaging device may further include a shake detection unit (184, 185) that detects a shake of the own device.

  (7) In the imaging device of any one of (1) to (6), the imaging device (100) may further include a mount (150) for mounting the interchangeable lens.

  (8) In the imaging device of (7), the imaging device (10) may further include an interchangeable lens (200) that can be attached to a mount.

  The embodiment has been described above as an example of the technique in the present disclosure. For this purpose, the detailed description and the accompanying drawings have been disclosed. Therefore, the constituent elements described in the detailed description and the accompanying drawings may include constituent elements that are not essential for solving the problem. Accordingly, just because those non-essential components are described in the detailed description and the accompanying drawings, those non-essential components should not be immediately recognized as essential.

  The above embodiment is for illustrating the technique in the present disclosure. Therefore, various changes, substitutions, additions and / or omissions may be made to the above-described embodiments within the scope of the claims or an equivalent scope thereof.

  The idea of the present disclosure is an electronic device (digital camera) that has an image blur correction function by driving an image sensor and can capture a subject image via a lens on which a rotationally asymmetric image is formed, such as an anamorphic lens. And imaging devices such as camcorders, camera bodies, mobile phones, smartphones, etc.).

10 Digital camera 100 Camera body 110 CCD
140 Camera controller 150 Body mount 184, 224 Gyro sensor 181 CCD drive unit 182, 222 Position sensor 183 BIS processing unit 200 Interchangeable lens 220 OIS lens 221 OIS drive unit 223 OIS processing unit 240 Lens controller 250 Lens mount

Claims (8)

An image sensor that captures a subject image formed via a lens and generates image data;
An element driving unit that performs image blur correction by moving the imaging element in a plane perpendicular to the optical axis in two orthogonal directions and rotating around the optical axis;
A correction processing unit that acquires blur information indicating a blur amount of the device itself and controls the element driving unit based on the blur information; and
The correction processing unit
A specific mode used when a subject image is formed on the image sensor through a specific lens that forms a rotationally asymmetric image;
In the specific mode, the element driving unit is controlled so as to prohibit the rotational movement of the imaging element during image blur correction.
Imaging device.   The imaging device according to claim 1, wherein the specific lens is an anamorphic lens that forms an image by converting an aspect ratio of a subject image to 1: k. The correction processing unit calculates a movement amount of the translational movement of the imaging element in the specific direction for image blur correction from a blur amount indicated by the blur information;
The correction processing unit sets the calculated movement amount to 1 time in a mode other than the specific mode, and sets the calculated movement amount to 1 / k time in the specific mode. The imaging device described.   The imaging device according to claim 1, wherein the specific lens is a 3D lens that includes two optical systems arranged side by side in a specific direction, and images from the respective optical systems are formed in two adjacent regions. . The correction processing unit calculates a movement amount of the translational movement of the imaging element in the specific direction for image blur correction from a blur amount indicated by the blur information;
The correction processing unit sets the calculated movement amount to 1 time in a mode other than the specific mode, and sets the calculated movement amount to 1/2 time in the specific mode. The imaging device described.   The imaging apparatus according to claim 1, further comprising a shake detection unit that detects shake information indicating a shake amount of the own apparatus.   The imaging apparatus according to claim 1, further comprising a mount for mounting an interchangeable lens.   The imaging apparatus according to claim 7, further comprising an interchangeable lens that can be attached to the mount.

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