JP4957851B2 - Camera shake detection device, camera shake detection method, and camera shake detection program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device, method and program for detection of a camera shake, which suppress an image shift of a subject, which occurs in a captured image due to a detection sensor, and suppress the reduction in lifetime of a battery. <P>SOLUTION: The camera shake detection device has a detection sensor for detecting the speed of rotation, about one prescribed axis, of a camera and includes: a first image shift calculation unit 200b, which drives the detection sensor 200a to detect the rotation speed and calculates the amount of image deviation in a first direction, on the basis of the rotation speed with respect to an image of a subject captured by the camera; a second image shift calculation unit 200c, which calculates the amount of image deviation in a second direction, with respect to the image of the subject captured by the camera, on the basis of a prescribed image analysis results about the image of the subject captured by the camera; and a camera shape amount estimation part 200e, which uses the amount of image deviation in the first direction and that in the second direction to estimate the amount of camera shake. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a camera shake detection device, a camera shake detection method, and a camera shake detection program that detect the amount of camera shake that occurs during shooting of a subject.

In recent years, a detection device for detecting movement of a gyro or the like is attached to an electronic device, the movement of the electronic device is detected, and correction or control regarding the function of the electronic device is performed by the detected movement. For example, when the electronic device is a photographic device such as a digital camera, the amount of camera shake that occurs during shooting as one of the camera movements is detected using a detection sensor such as a gyro, and the amount of camera shake is determined based on the detected amount of camera shake. In this case, the amount of deviation of the image in the vertical direction or the horizontal direction that occurs in the captured image is suppressed (for example, Patent Document 1 or Patent Document 2).

In detecting the amount of camera shake of such a camera, the amount of camera shake is usually detected using at least two detection sensors in order to more accurately prevent camera shake.
For example, Patent Document 1 discloses a technique for detecting the amount of camera shake by arranging two detection sensors at a grip position of a camera, and Patent Document 2 discloses a technique for detecting camera shake by arranging two detection sensors near a pentaprism. Techniques for detecting quantities are disclosed.

JP-A-5-142613 Japanese Patent Laid-Open No. 9-189932

By the way, in recent years, the downsizing of photographing devices such as mobile phones with camera functions has progressed,
Due to this, the size of the battery mounted on the photographing device is also reduced. Therefore, it is necessary to take a power saving measure to reduce the current consumption of the photographing device so that the battery life is not shortened.

On the other hand, a gyro sensor using a vibrator such as a piezoelectric vibrator is generally employed as a detection sensor for detecting the amount of camera shake, and a change in the vibration state of the vibrator is detected to detect a vibration around a predetermined axis. It has a mechanism to detect angular velocity. For this reason, in order to detect the amount of camera shake, it is necessary to drive the piezoelectric vibrator and always keep it in a vibrating state. Therefore, it is necessary to always pass a driving current through the detection sensor. Therefore, the detection sensor consumes current, leading to a shortened battery life.

However, in Patent Document 1 and Patent Document 2, there is no disclosure of the technology related to current consumption when detecting camera shake, and it is possible to detect the amount of camera shake by the detection sensor and suppress the deviation of the subject image that occurs in the captured image. However, there is a problem that the battery life is shortened.

The present invention has been made in view of such a problem, and a camera shake detection device, a camera shake detection method, and the like, which suppress a shift amount of an image of a subject generated in a photographed image by a detection sensor and reduce a battery life. It is another object of the present invention to provide a camera shake detection program.

In order to solve the above-mentioned problems, a camera shake detection device according to a first aspect of the present invention is a camera shake detection device that detects the amount of camera shake that occurs when a subject is photographed.
A detection sensor that detects a rotation speed around one axis, detects the rotation speed by driving the detection sensor, and is an image shift amount in a first direction with respect to an image of a subject captured by the camera. A first image shift amount calculation unit that calculates an image shift amount of 1 based on the rotation speed; and a second image shift amount in a second direction with respect to an image of a subject captured by the camera.
A second image shift amount calculation unit that performs predetermined image analysis on the image of the subject captured by the camera and calculates the image shift amount of the first image shift amount and the first image shift amount. And a camera shake amount estimation unit that estimates the camera shake amount of the camera using the image shift amount of 2.

According to this configuration, for example, for a captured image, the amount of image shift in the vertical direction is calculated using the detection sensor, and the amount of image shift in the horizontal direction is calculated by analyzing the captured image. Then, the camera shake amount of the camera is estimated using the calculated image shift amounts in the vertical direction and the horizontal direction, respectively. Therefore, since the amount of camera shake can be estimated even with a single detection sensor, it is possible to suppress the amount of image misalignment of the subject that occurs in the captured image and to reduce the battery life.

The camera shake detection apparatus according to the first aspect of the present invention further includes an image shift amount recording unit that records the second image shift amount calculated by the second image shift amount calculation unit every time a subject is photographed. The camera shake amount estimation unit uses an image shift amount calculated by a predetermined method from a plurality of second image shift amounts recorded by the image shift amount recording unit as the second image shift amount. It is characterized by estimating the amount of camera shake.

In this way, for example, the horizontal image shift amount calculated from the analysis result of the captured image is recorded for each shooting, and the camera shake amount of the camera is estimated using a plurality of recorded horizontal image shift amounts. . Accordingly, since a plurality of lateral image shift amounts are used, the accuracy of the estimated camera shake amount is increased.

Here, the first direction and the second direction for the captured image may be directions orthogonal to each other.

In this way, since the image shift amount is calculated for two orthogonal axial directions, the camera motion due to camera shake can be grasped as motion components in mutually independent directions having no common direction component. Therefore, the accuracy of the camera shake amount to be estimated is increased.

Furthermore, the camera shake detection apparatus according to the first aspect of the present invention may further include a shooting condition correction unit that corrects the shooting condition of the camera in accordance with the camera shake amount estimated by the camera shake amount estimation unit.

In this way, it is possible to correct shooting conditions such as the shutter speed, aperture, and sensitivity of the camera according to the estimated amount of camera shake. Accordingly, it is possible to take an image with a suppressed image shift amount of the subject at the time of shooting.

Alternatively, a camera shake detection device according to a second invention of the present invention is a camera shake detection device that detects the amount of camera shake that occurs during shooting of a subject, and includes a first axis that is a predetermined two axes of the camera, and A first detection sensor and a second detection sensor for detecting a first rotation speed and a second rotation speed, which are rotation speeds about the respective axes, with respect to the second axis; At least (1) driving the first detection sensor to detect the first rotational speed;
Calculating a first image shift amount, which is an image shift amount in a first direction, of the subject image captured by the camera based on the first rotation speed; or (2) the second A detection sensor is driven to detect the second rotation speed, and a second image shift amount, which is an image shift amount in a second direction, of the subject image captured by the camera is determined as the second rotation speed. The image displacement amount calculation unit that performs calculation based on the first image displacement amount and the second image displacement amount are compared, and the larger image displacement amount is set as the third image displacement amount. And an image shift amount selection unit that selects the other as the fourth image shift amount, and a camera shake amount estimation unit that estimates the camera shake amount of the camera using the third image shift amount. To do.

According to this configuration, for example, for a captured image, the vertical image shift amount is calculated using the first detection sensor, and the horizontal image shift amount is calculated using the second detection sensor. Is calculated. Then, the calculated vertical and horizontal image shift amounts are compared, and if the larger image shift amount is the vertical direction, the camera shake amount of the camera is estimated using the vertical image shift amount. . In other words, in order to calculate the amount of image displacement that occurs in the captured image by driving the detection sensor that detects the direction in which the amount of image displacement is large among the two detection sensors, the amount of camera shake is roughly estimated using one detection sensor. It becomes possible to do. As a result, it is possible to suppress the amount of image shift that occurs in the captured image using one detection sensor.

The camera shake detection apparatus according to the second aspect of the present invention includes a shooting mode determination unit that determines whether or not the camera is in a shooting mode state in which the subject can be shot, and the shooting mode determination unit is in a shooting mode state. After the determination, the camera further includes a photographing number recording unit that records the number of photographings of the camera, and the image shift amount calculating unit includes the first detection sensor or the second detection for the second and subsequent photographing times. Of the sensors, only the detection sensor for detecting the rotation speed corresponding to the third image shift amount selected when the number of times of photographing is the first may be driven.

According to this configuration, the two detection sensors are driven at the time of first shooting after entering the shooting mode state, and the image shift amount is large by comparing the vertical and horizontal image shift amounts calculated thereby. Select the direction. For example, if the selected image shift amount is in the vertical direction, 2
From the time of the subsequent shooting, only the detection sensor for calculating the vertical image shift amount is driven to calculate the image shift amount of the subject generated in the shot image. Therefore, during the second and subsequent shooting,
Since only one detection sensor can be driven to estimate the camera shake amount of the camera, it is possible to suppress the amount of image shift that occurs in the captured image and to suppress the shortening of the battery life.

Here, the camera shake amount estimation unit calculates the third image shift amount and the fourth image shift amount selected when the number of shootings is the first time when the number of shootings is the second time or later. The camera shake amount of the camera may be estimated.

In this way, for example, when the image displacement amount is larger in the vertical direction at the time of the first photographing, the image displacement amount in the vertical direction calculated using the detection sensor from the second and subsequent photographing times, The camera shake amount of the camera is estimated using the horizontal image shift amount calculated using the detection sensor at the time of the first shooting. Therefore, although only one detection sensor is driven during the second and subsequent shootings, both the vertical image shift amount and the horizontal image shift amount calculated using the detection sensor during the first shooting are used. Thus, it is possible to estimate the amount of camera shake, and thus it is possible to more accurately suppress the amount of image shift that occurs in the captured image, and it is possible to suppress a reduction in battery life.

In the camera shake detection device according to the second aspect of the present invention, the first direction and the second direction for the captured image may be directions orthogonal to each other.

In this way, since the image shift amount is calculated for two orthogonal axial directions, the camera motion due to camera shake can be grasped as motion components in mutually independent directions having no common direction component. Therefore, the accuracy of the camera shake amount to be estimated is increased.

In addition, a shooting condition correction unit that corrects shooting conditions of the camera according to the camera shake amount estimated by the camera shake amount estimation unit may be further provided.

In this way, it is possible to correct shooting conditions such as the shutter speed, aperture, and sensitivity of the camera according to the estimated amount of camera shake. Accordingly, it is possible to take an image with a suppressed image shift amount of the subject at the time of shooting.

The present invention can also be understood as a camera shake detection method. In other words, the first camera shake detection method of the present invention is a camera shake detection method for detecting the amount of camera shake that occurs during shooting of a subject, and includes a detection sensor that detects the rotational speed of the camera around a predetermined axis. A first image that is driven to detect the rotation speed and calculates a first image shift amount that is an image shift amount in a first direction based on the rotation speed with respect to an image of a subject that is captured by the camera. A deviation amount calculating step, a second image deviation amount that is an image deviation amount in a second direction for the subject image captured by the camera, and a predetermined image analysis for the subject image captured by the camera; A camera shake amount estimation process for estimating the camera shake amount of the camera using the second image shift amount calculation step calculated based on the analysis result, and the first image shift amount and the second image shift amount. And summarized in that with and.

A second camera shake detection method according to the present invention is a camera shake detection method for detecting the amount of camera shake that occurs when a subject is photographed. The camera shake detection method includes a first axis that serves as two predetermined axes of the camera, and a second camera shake detection method. A first detection sensor and a second detection sensor for detecting a first rotation speed and a second rotation speed, respectively, which are rotation speeds around each axis, and at least,
(1) The first detection sensor is driven to detect the first rotation speed, and a first image shift amount that is an image shift amount in a first direction is detected with respect to an image of a subject photographed by the camera. , Calculating based on the first rotation speed, or (2) driving the second detection sensor to detect the second rotation speed, and for the subject image captured by the camera, An image shift amount calculating step of calculating a second image shift amount that is an image shift amount in the direction of 2 based on the second rotation speed, the first image shift amount, and the second image shift amount. And an image shift amount selection step of selecting the larger image shift amount as the third image shift amount and the other as the fourth image shift amount, and the camera shoots the subject. Whether or not the camera is in shooting mode A shooting mode determination step; and a shooting number recording step of recording the number of shootings of the camera after the shooting mode determination step is determined to be in the shooting mode state. Thereafter, the third sensor selected when the number of times of photographing is the first time out of the first detection sensor or the second detection sensor.
Only the detection sensor for detecting the rotational speed corresponding to the image shift amount is driven.

Alternatively, the present invention can be understood as a camera shake detection program. That is, a first camera shake detection program according to the present invention is a camera shake detection program for detecting the amount of camera shake that occurs during shooting of a subject, and includes a detection sensor that detects a rotational speed around a predetermined axis of the camera. A first image that is driven to detect the rotation speed and calculates a first image shift amount that is an image shift amount in a first direction based on the rotation speed with respect to an image of a subject that is captured by the camera. A deviation amount calculation function and a second image deviation amount that is an image deviation amount in a second direction for the subject image captured by the camera, and a predetermined image analysis for the subject image captured by the camera; A hand for estimating the camera shake amount of the camera using the second image shift amount calculation function to be calculated based on the analysis result, the first image shift amount, and the second image shift amount. And summarized in that to achieve a that amount estimation function to the computer.

A second camera shake detection program according to the present invention is a camera shake detection program for detecting the amount of camera shake that occurs when a subject is photographed. The first camera shake detection program serves as a predetermined two axes of the camera.
A first detection sensor and a second detection sensor for detecting a first rotation speed and a second rotation speed, respectively, which are rotation speeds about the respective axes. Have
At least (1) the first detection sensor is driven to detect the first rotation speed, and the first image shift that is the image shift amount in the first direction is detected with respect to the image of the subject captured by the camera. Calculating the amount based on the first rotation speed, or (2) driving the second detection sensor to detect the second rotation speed, and the image of the subject captured by the camera An image shift amount calculation function for calculating a second image shift amount that is an image shift amount in the second direction based on the second rotation speed, the first image shift amount, and the An image shift amount selection function that compares the second image shift amount and selects the larger image shift amount as the third image shift amount and the other as the fourth image shift amount, and the camera shoots the subject Whether it is in a shooting mode And a shooting mode determination function for determining whether or not the shooting mode determination function is in a shooting mode state, and a shooting number recording function for recording the number of shootings of the camera is implemented in a computer. The rotation speed corresponding to the third image shift amount selected when the number of photographing times is the first time out of the first detection sensor or the second detection sensor for the second and subsequent number of photographing times. Only the detection sensor for detection is driven.

(A) is explanatory drawing explaining the outline | summary about the camera shake of a camera. FIG. 6B is an explanatory diagram illustrating an image shift amount with respect to a subject of a captured image. Explanatory drawing explaining the image shift of the to-be-photographed object in a picked-up image. Explanatory drawing explaining the functional block structure of the camera-shake detection apparatus of 1st Example. The block diagram explaining the circuit structure of the camera-shake detection apparatus of 1st Example. The processing flowchart which the camera-shake detection apparatus of 1st Example performs. Explanatory drawing explaining the functional block structure of the camera-shake detection apparatus of 2nd Example. The block diagram explaining the circuit structure of the camera-shake detection apparatus of 2nd Example. The process flowchart which the camera-shake detection apparatus of 2nd Example performs.

Hereinafter, embodiments embodying the present invention will be described using examples. In addition, the first example is an example in which the amount of camera shake is estimated when there is one detection sensor, and the second example is
In this embodiment, the amount of camera shake is estimated when there are two detection sensors.

Before explaining these embodiments, the outline of the camera shake detection apparatus of the present invention will be described with reference to FIGS.
And will be described. FIG. 1 is an explanatory diagram for explaining the amount of camera shake at the time of shooting for a digital camera (hereinafter simply referred to as a camera) as an example of an electronic device to be incorporated into the camera shake detection device of the present invention. FIG. 2 is an explanatory diagram for explaining an image shift amount of a subject generated in a photographed photographed image.

As shown in FIG. 1 (a), when the shutter button SB is pressed to release the shutter and the subject is photographed, the camera shakes not a little due to the movement of the photographer's body. As shown in the figure, camera shake occurs as a rotation around each axis when the horizontal axis of the camera is the X axis, the vertical axis is the Y axis, and the central axis of the lens is the Z axis. Here, rotation around the X axis is called pitch, rotation around the Y axis is called roll, and rotation around the Z axis is called yaw.

For example, when a subject is photographed while holding the camera in the state shown in FIG. 1A, if the pitch occurs in the camera, the subject image is shifted in the vertical direction. This image shift amount is calculated from the relationship between the rotation speed of the pitch, the shutter speed, and the angle of view. This will be described with reference to FIG.

FIG. 1B shows the camera viewed from the X-axis direction. As shown in the figure, if the angle of view of the camera at the time of shooting is GK (degrees), the range of the image shot at this time is a range corresponding to this angle of view GK. FIG. 1B shows that when a subject located at a distance L from the camera is photographed, the vertical screen size of the photographed image becomes H.

In this state, if a pitch of rotational speed PS (degrees / second) is generated around the X axis during shooting, the image of the subject is captured by an image sensor such as a CCD (not shown) built into the camera while the shutter is open. Will be captured. For this reason, the captured image is an image in which the image of the subject is shifted in the vertical direction by an amount corresponding to the pitch rotation amount for the shutter speed SS (seconds).

Incidentally, if this vertical image shift amount is TZ, TZ = H × (PS × SS / GK)
Is calculated by In addition, since the captured image is captured by an image sensor such as a CCD, for example, when H is the number of vertical pixels of the image sensor, the amount of image shift is calculated as the number of pixels. Accordingly, the image shift amount calculation processing described in the following embodiments performs processing for calculating the number of pixels.

As with the X axis, when roll rotation occurs around the Y axis, the subject image in the captured image shifts laterally to produce an image shift amount YZ, and when yaw rotation occurs around the Z axis, the subject in the captured image Are shifted in the rotation direction to generate an image shift amount KZ.

FIG. 2 is a diagram showing these image shift amounts TZ, YZ, and KZ. FIG. 2A shows a state in which no image deviation occurs in the subject of the captured image. In contrast, FIG.
2B shows a state in which the subject image is shifted due to the vertical image shift amount TZ, and FIG. 2C shows a state where the subject image is shifted due to the horizontal image shift amount YZ. ) Shows a state in which the image of the subject is displaced by the image displacement amount KZ in the rotation direction.

Of course, the image of the subject is shifted to a state where these image shift amounts are added. For example, when pitch and roll are generated, as shown in FIG. 2 (e), an image shift in which the vertical direction and the horizontal direction are added is generated, and when all of pitch, roll and yaw are generated, FIG. (F)
As shown in FIG. 5, an image shift in which the vertical direction, the horizontal direction, and the rotation direction are added is generated.

By the way, a photographer of a camera usually takes a picture while holding the camera in a stable manner by holding the camera by supporting the camera with both hands or bringing the camera into contact with a part of the face.
In such a state, since it is difficult to rotate the camera, it is estimated that the rotation of the camera around the Z axis in FIG. On the other hand, about rotation of the camera around the X axis and Y axis, even if the photographer holds the camera stably, it can easily move up and down and left and right as the body moves. It is estimated that the frequency of occurrence is relatively high.

In this embodiment, attention is paid to the vertical and horizontal image shifts that are estimated to have a relatively high occurrence frequency, and the camera shake amount of the camera is estimated from the image shift amounts of the subject in the vertical and horizontal directions. In this way, it is intended to suppress the image shift of the subject in the captured image at the time of actual shooting. Further, with respect to detection sensors that detect rotational speeds around the X and Y axes, the number of detection sensors to be driven is reduced, thereby suppressing current consumption and suppressing battery life from being shortened.

(First embodiment)
First, an embodiment of the first invention of the present invention, which is a first embodiment for estimating the amount of camera shake using one detection sensor, will be described.

FIG. 3 is an explanatory diagram for explaining a functional block configuration of a camera shake detection apparatus 200 according to the first embodiment incorporated in a camera. As illustrated, the camera shake detection device 200 includes a detection sensor 200a, a first image shift amount calculation unit 200b, a second image shift amount calculation unit 200c, an image shift amount recording unit 200d, a camera shake amount estimation unit 200e, and a photographing. It is composed of a condition correction unit 200f.

The detection sensor 200a is a sensor (hereinafter also referred to as “X-axis detection sensor”) for detecting the rotational speed of the pitch around the X axis described in FIG. 1, and is an angular velocity sensor in the present embodiment. Treat as a thing. Of course, any sensor having a configuration capable of measuring the speed around the axis, such as an angular acceleration sensor or an acceleration sensor, may be used.

The first image shift amount calculation unit 200b drives the detection sensor 200a and calculates the image shift amount in the vertical direction based on the detected rotation speed. Of course, when calculating the image shift amount, as described above, the first image shift amount calculation unit 200b acquires the angle of view and shutter speed of the camera at the time of shooting, and the number of vertical pixels of the image sensor.

The second image displacement amount calculation unit 200c performs a predetermined image analysis on the captured image captured by the camera, and calculates the image displacement amount in the horizontal direction. In this embodiment, as an image analysis method, it is assumed that an image shift amount is calculated by edge detection that detects an edge of an image by paying attention to a change rate of a pixel value. Of course, the image shift amount may be calculated by using a well-known image analysis technique such as pattern matching focusing on image feature points and optical flow tracking focusing on a certain luminance value of pixels, not limited to edge detection. .

The image shift amount recording unit 200d records the image shift amount in the horizontal direction calculated by the second image shift amount calculation unit for each shooting. Therefore, the image shift amount recording unit 200d records the image shift amount in the horizontal direction for the number of times of shooting.

The camera shake amount estimation unit 200e estimates the camera shake amount using the vertical image shift amount and the horizontal image shift amount. In this embodiment, the vertical direction and the horizontal direction are directions orthogonal to each other. By doing so, it is possible to calculate the image shift amount in directions independent from each other.
Therefore, the camera shake amount estimation unit 200e estimates the image shift amount in the vertical direction and the image shift amount in the horizontal direction as orthogonal vector components, and estimates the image shift amount obtained by vector synthesis as the camera shake amount at the time of shooting.

The shooting condition correction unit 200f corrects shooting conditions that are actually shot by the camera during shooting. In the present embodiment, with respect to the shooting conditions of the shutter speed and sensitivity, the shooting conditions set by the photographer and the shooting conditions automatically set by the camera are corrected based on the estimated amount of camera shake. Of course, in addition to this, the aperture and flash lighting may be considered as the shooting conditions, and it is preferable to make corrections as necessary.

Next, a circuit configuration of the camera shake detection apparatus 200 will be described. FIG. 4 shows a camera shake detection device 2
2 is a block diagram illustrating a circuit configuration of 00. FIG. The camera shake detection device 200 includes a CPU 150.
, RAM 160, ROM 170, input interface (I / F) 140, output interface (I / F) 180, X-axis detection sensor 110, analog / digital conversion circuit (A
/ D) 120 and a drive circuit 130 are configured, and these are connected to each other via a bus line.

The input I / F 140 functions as an interface for a captured image captured by an image sensor (not shown) via a lens and as an interface for a shutter operation of the shutter button SB, and converts each into a predetermined digital signal that can be handled by the CPU 150. The drive circuit 130 is a drive circuit that drives the X-axis detection sensor 110, and includes an A / D 12
A conversion circuit 0 converts an analog output from the X-axis detection sensor 110 into a digital output that can be handled by the CPU 150. The output I / F 180 functions as an interface that outputs correction data related to the shooting conditions of the camera to the shooting circuit 190 provided in the camera. Of course, the photographing circuit 190 is a circuit having a function of setting photographing conditions at the time of actual photographing in accordance with correction data of photographing conditions of the camera output from the output I / F 180 and capturing a subject image in the image sensor.

The CPU 150 performs a predetermined process by reading a program stored in the ROM 170 and executing it under a predetermined operating system. The CPU 150 records digital data in the RAM 160 as necessary, reads out necessary digital data from the RAM 160 and the ROM 170, or outputs predetermined digital data to the output I / F 18.
5 is output to the photographing circuit 190 via 0, and the process shown in the flowchart of FIG. 5 is executed.

Now, processing performed by the camera shake detection apparatus 200 in the first embodiment will be described with reference to the flowchart of FIG. When this processing is started, first, in step S211, processing for determining whether or not the photographing mode is set is performed. In this embodiment, a power switch (not shown)
Assume that the CPU 150 determines that the camera is turned on as a shooting mode. Of course, if the camera has a shooting mode selection function, the CPU 150 may read the selection information to make a determination.

Next, when the CPU 150 determines that the shooting mode is set (S211: YES), the CPU 150 performs a process of driving the detection sensor (step S212). On the other hand, if it is determined that the shooting mode is not set (S211: NO), the processing here ends.

Next, in step S213, processing for determining whether or not there is a recording history of the amount of image shift in the horizontal direction is performed. If it is not recorded (S213: NO), a process of setting the image shift amount in the horizontal direction as a default value (step S214) is performed. In the first shooting, since the processing in step S222 to be described later has not yet been performed, the recording history of the image shift amount in the horizontal direction is not updated. Therefore, the default value is used when there is no recording history of the amount of image shift in the horizontal direction. The default value may be stored in the ROM 170 in advance, or the photographer inputs the default value using an input means (not shown) provided in the camera, and the RAM
It is good also as storing in 160.

Next, in step S215, it is determined whether or not the shutter has been released. CP
The U 150 determines that the shutter has been released by receiving the shutter operation signal of the shutter button SB via the input I / F 140. If a shutter operation signal is received and it is determined that the shutter has been released (S215: YES), the process proceeds to step S216 and subsequent steps. On the other hand, if it is determined that the shutter has not been released (S215: NO), the process returns to step S211 and the processes up to step S215 are repeated again.

When the shutter is released, vertical image shift amount calculation processing is performed in the next step S216. The CPU 150 determines the image in the vertical direction from the digital data of the rotation speed detected by the driven X-axis detection sensor 110 at the time of shooting, the angle of view and the shutter speed of the camera at the time of shooting, and the number of vertical pixels of the image sensor. The amount of deviation is calculated as the number of pixels.

Next, in step S217, a horizontal image shift amount calculation process is performed. As mentioned above, 1
In the second shooting, the CPU 150 reads a default value stored in the ROM 170 and calculates it as a horizontal image shift amount. On the other hand, at the time of the second and subsequent shootings, since the horizontal image shift amount is recorded in step S222 described later, the CPU 150 reads out the recorded horizontal image shift amount and calculates it by a predetermined method. The calculated image shift amount is calculated as the horizontal image shift amount at the second and subsequent shootings.

In this embodiment, a simple average of the recorded lateral image shift amounts is calculated. Of course, in addition to the average value, select a calculation method according to the variation status of the recorded horizontal image misalignment, such as a calculation method that selects frequently occurring ones or a method that calculates the average by weighting. May be. Alternatively, a predetermined one horizontal image shift amount, such as the first or last recorded horizontal image shift amount or the largest horizontal image shift amount up to that time, can be used for the second and subsequent shootings. It may be calculated as the image shift amount in the direction.

Then, using the vertical image shift amount calculated in step S216 and the horizontal image shift amount calculated in step S217, processing for estimating the amount of camera shake is performed (step S2).
18). As described above, in this embodiment, the image shift amount obtained by vector-combining the image shift amount in the vertical direction and the image shift amount in the horizontal direction is estimated as the camera shake amount.

Next, in step S219, processing for correcting shooting conditions is performed. The CPU 150 corrects the shutter speed and sensitivity among the shooting conditions at the time of actual shooting based on the estimated amount of camera shake. For example, the number of pixels when the image of the subject in the captured image can be recognized as being misaligned is used as the reference pixel number, and the ratio of the pixel number estimated as the amount of camera shake to the reference pixel number is calculated. Correction is made to increase the shutter speed by the time corresponding to the ratio. Since the exposure becomes insufficient due to the increased shutter speed, the sensitivity is corrected so as to compensate for the underexposure. After that, the CPU 150
The shooting conditions corrected in this way are output to the shooting circuit 190 provided in the camera.

The next steps S220 to S222 are processes for calculating the amount of image misalignment in the horizontal direction using the actually captured image. First, in step S220, a process for acquiring a captured image is performed. The CPU 150 acquires the captured image by storing the image data captured by the image sensor via the input I / F 140 in the RAM 160.

Next, in step S221, the captured image is subjected to image analysis to calculate a lateral image shift amount. The CPU 150 reads the stored photographed image, performs the edge detection process as described above, and then reads the number of pixels existing between the edges in the lateral direction from the photographed image to calculate the image shift amount in the lateral direction. At this time, the CPU 150 reads out the number of pixels between the edges for all the image areas in which the edge is detected in the captured image, and calculates the maximum number of pixels as the amount of image shift in the horizontal direction. Of course, the present invention is not limited to this, and the number of pixels between edges may be read out only for a predetermined image area such as the left and right ends, or the average value of the number of read out pixels may be used as the horizontal image shift amount.

Note that the amount of image shift that occurs in a normal captured image is often within a few tens of pixels, so that the number of pixels existing between edges is within a predetermined number of pixels, for example, within 20 pixels, It is preferable to read out the amount of image shift in the horizontal direction. In this way, the processing load can be reduced, and the probability of appropriately calculating the amount of horizontal image shift increases.

Next, in step S222, a recording history update process for the image shift amount in the horizontal direction is performed. CPU
150 stores the image shift amount in the horizontal direction calculated in step S <b> 221 in a predetermined recording area of the RAM 160. By this process, the recording history of the image shift amount in the horizontal direction is updated.

Thereafter, the process returns to step S211, and the processing steps S211 to S222 are repeated at the time of the next shooting, so that the amount of camera shake at the time of shooting is estimated and the image shift of the subject that occurs in the shot image is suppressed.

As described above, the processing in the first embodiment has been described with reference to the flowchart. As is apparent from the description, according to the first embodiment, the actually captured image is calculated by image analysis in the horizontal direction. The amount of camera shake is estimated by using the amount of image shift and using the amount of image shift calculated using the detection sensor in the vertical direction. Accordingly, it is possible to suppress the amount of image shift that occurs in the photographed image by one detection sensor, and it is possible to suppress current consumption associated with driving of the detection sensor, thereby suppressing image shift of the subject and further shortening the battery life. It is possible to provide a camera shake detection device that suppresses the above.

(Second embodiment)
Next, a second embodiment of the second invention of the present invention, in which the amount of camera shake is estimated by two detection sensors, will be described.

FIG. 6 is an explanatory diagram for explaining a functional block configuration of a camera shake detection apparatus 300 according to the second embodiment incorporated in a camera. As illustrated, the camera shake detection device 300 includes a detection sensor 300a, an image shift amount calculation unit 300b, an image shift amount selection unit 300c, and a camera shake amount estimation unit 30.
0e, shooting condition correction unit 300f, shooting mode determination unit 300g, and shooting count recording unit 30
It consists of 0h.

In this embodiment, the detection sensor 300a is a sensor for detecting the rotational speeds of the pitch around the X axis and the roll around the Y axis described in FIG. 1, both of which are the same as in the first embodiment. Treat as an angular velocity sensor. Of course, any sensor having a configuration capable of measuring the speed around the axis, such as an angular acceleration sensor or an acceleration sensor, may be used. A sensor for detecting the rotational speed of the roll around the Y axis is hereinafter also referred to as a “Y axis detection sensor”.

The image shift amount calculation unit 300b drives the detection sensor 300a and calculates the vertical image shift amount and the horizontal image shift amount based on the detected rotational speeds. Of course, when calculating the image shift amount, the image shift amount calculation unit 300b acquires the angle of view and shutter speed of the camera at the time of shooting, and the number of vertical and horizontal pixels of the image sensor.

The image shift amount selection unit 300c compares the image shift amount in the horizontal direction calculated by the image shift amount calculation unit 300b with the image shift amount in the vertical direction, and identifies the larger image shift amount and the smaller image shift amount.

The camera shake amount estimation unit 300e estimates the camera shake amount using the vertical image shift amount and the horizontal image shift amount. In the present embodiment, as in the first embodiment, the vertical direction and the horizontal direction are orthogonal to each other. By doing so, it is possible to calculate image shift amounts independent of each other. Accordingly, the camera shake amount estimation unit 300e estimates the image shift amount in the vertical direction and the image shift amount in the horizontal direction as orthogonal vector components, and estimates the image shift amount obtained by vector synthesis as the camera shake amount at the time of shooting.

The shooting condition correction unit 300f corrects the set shooting conditions of the camera during actual shooting, similar to the shooting condition correction unit 200f in the first embodiment. As in the first embodiment, in this embodiment, the shooting conditions set by the photographer for shooting and the shooting conditions set automatically by the camera are corrected based on the estimated amount of camera shake. To do.

The shooting mode determination unit 300g determines whether or not the camera is in a shooting mode in which the subject can be shot when the shutter button is pressed and the shutter is released. In this example,
Assume that the camera is turned on as a shooting mode. Of course, for example, when the camera has a shooting mode selection function, the shooting mode may be determined using this selection information.

The shooting number recording unit 300h records the number of times the shutter is released, that is, the number of shootings of the subject after the shooting mode determination unit 300g determines that the shooting mode is set. Accordingly, it is possible to determine the number of times of shooting in the shooting mode when shooting.

Next, a circuit configuration of the camera shake detection apparatus 300 will be described. FIG. 7 shows a camera shake detection device 3
2 is a block diagram illustrating a circuit configuration of 00. FIG. The camera shake detection apparatus 300 is obtained by adding a Y-axis detection sensor 111, a drive circuit 131, and an analog / digital conversion circuit (A / D) 121 to the camera shake detection apparatus 200 shown in FIG. .

The drive circuit 131 is a drive circuit that drives the Y-axis detection sensor 111, and is an A / D 121.
Is a conversion circuit that converts an analog output from the Y-axis detection sensor 111 into a digital output that can be handled by the CPU 150. The other circuit configurations such as the CPU 150 are the same as the circuit configuration of the first embodiment shown in FIG.

The CPU 150 performs a predetermined process by reading a program stored in the ROM 170 and executing it under a predetermined operating system. The CPU 150 records digital data in the RAM 160 as necessary, reads out necessary digital data from the RAM 160 and the ROM 170, or outputs predetermined digital data to the output I / F 18.
8 is output to the photographing circuit 190 via 0, and the process shown in the flowchart of FIG. 8 is executed.

The processing performed by the camera shake detection apparatus 300 in the second embodiment will be described with reference to the flowchart of FIG. When this process is started, first, in step S311, a process for determining whether or not the photographing mode is set is performed. In this embodiment, as described above, it is assumed that the CPU 150 determines that the camera is turned on as a shooting mode by a power switch (not shown).

Next, when the CPU 150 determines that the shooting mode is set (S311: YES), the CPU 150 performs processing for determining whether or not shooting is the first time (step S312). On the other hand, if it is determined that the camera is turned off and not in the shooting mode (S311: NO), the process here ends.

In step S312, the CPU 150 recognizes that the shutter has been released by receiving the shutter operation signal of the shutter button SB via the input I / F 140, and each time R
The number of photographing is stored by writing data in a predetermined recording area of the AM 160. Therefore, the CPU 150 determines the number of times of photographing by reading data stored in a predetermined recording area prior to writing. Incidentally, if the stored data does not exist, it is determined that the shooting is the first time.

If it is determined that the image capturing is the first time (S312: YES), a process of driving the two detection sensors of the X axis and the Y axis is performed (step S313). The CPU 150 drives the X-axis detection sensor 110 and the Y-axis detection sensor 111 with the drive circuit 130 and the drive circuit 131.

On the other hand, if it is determined that the shooting is not the first time (S312: NO), a process of driving the detection sensor to be driven is performed (step S314). The detection sensor to be driven is either one of the X-axis detection sensor 110 or the Y-axis detection sensor 111, and is determined by the processing steps S325 to S329 performed at the first imaging. Step S
The processing from 325 to S329 will be described later.

Next, in step S315, it is determined whether or not the shutter has been released. As described above, the CPU 150 determines that the shutter has been released by receiving the shutter operation signal of the shutter button SB via the input I / F 140. When the shutter operation signal is received and it is determined that the shutter has been released (S315: YES), step S
The process proceeds to 316 and later. On the other hand, if it is determined that the shutter has not been released (S315:
NO), it returns to step S311, and repeats the process up to step S315 again.

When the shutter is released, the vertical image shift amount calculation processing is performed in the next step S316.
In the next step S317, a horizontal image shift amount calculation process is performed. At this time, as described above, in the first photographing, the two detection sensors are driven in step S313. On the other hand, in the second and subsequent shootings, only one detection sensor to be driven is driven in step S314. Therefore, the contents of the image shift amount calculation processing performed in steps S316 and S317 are different between the first shooting and the second and subsequent shootings.

Therefore, first, processing contents at the time of the first photographing will be described. At the time of the first shooting, in step S316, the CPU 150 detects the rotational speed digital data detected by the driven X-axis detection sensor 110 at the time of shooting, the camera angle of view and the shutter speed at the time of shooting, and the image sensor. From the number of vertical pixels, the amount of image shift in the vertical direction is calculated as the number of pixels.

Next, in step S317, the CPU 150 causes the driven Y-axis detection sensor 11 to be driven.
A horizontal image shift amount is calculated as the number of pixels from digital data of rotational speed 1 detected at the time of shooting, the angle of view and shutter speed of the camera at the time of shooting, and the number of horizontal pixels of the image sensor.

In the next step S318, the amount of camera shake is estimated using the vertical image shift amount calculated in step S316 and the horizontal image shift amount calculated in step S317. As described above, in this embodiment, the image shift amount obtained by vector-combining the image shift amount in the vertical direction and the image shift amount in the horizontal direction is estimated as the camera shake amount.

Next, in step S319, processing for correcting the shooting conditions is performed. The CPU 150 corrects the shooting condition of the shutter speed or sensitivity at the time of actual shooting based on the estimated amount of camera shake. For example, the number of pixels when the image of the subject in the captured image can be recognized as being misaligned is used as the reference pixel number, and the ratio of the pixel number estimated as the amount of camera shake to the reference pixel number is calculated. Correction is made to increase the shutter speed by the time corresponding to the ratio. Since the exposure becomes insufficient due to the increased shutter speed, the sensitivity is corrected so as to compensate for the underexposure. Thereafter, the CPU 150 outputs the shooting conditions corrected in this way to the shooting circuit 190 provided in the camera.

In the next step S320, a process of determining again whether or not the photographing is the first time is performed. And
If it is determined that shooting is the first time (S320: YES), it is determined whether or not the vertical image shift amount is larger than the horizontal image shift amount (step S325). If the amount of image shift in the vertical direction is large (S325: YES), processing steps S326 and S32 are performed.
7 is executed, and when the image shift amount in the vertical direction is not large (S325: NO), processing steps S328 and S329 are executed.

If the image shift amount in the vertical direction is large, in step S326, a process for setting the X-axis detection sensor used for calculating the image shift amount in the vertical direction as a detection sensor to be driven is performed. In step S327, a process of converting the horizontal image shift amount to the horizontal image shift amount used for the subsequent calculation is performed. With these processes, at the time of the second and subsequent shooting, only the X-axis detection sensor is driven in step S314, and in step S317, the horizontal image shift amount calculated at the time of the first shooting is used as it is. To do.

On the other hand, if the image shift amount in the vertical direction is not large, in step S328, a process is performed in which the Y-axis detection sensor used for calculating the image shift amount in the horizontal direction is a detection sensor to be driven. In step S329, the vertical image shift amount is used as the vertical image shift amount used for the subsequent calculation. With these processes, at the time of the second and subsequent shooting, only the Y-axis detection sensor is driven in step S314, and in step S317, the vertical image shift amount calculated at the time of the first shooting is used as it is. To do.

When the processing at the time of the first shooting described above (steps S325 to S329) is completed, the process returns to step S311 to execute processing for the second and subsequent shootings. The difference between the first and second shootings will be mainly described in the processing performed at the second and subsequent shootings.

If it is determined in step S311 that the shooting mode is continued (YES), the shooting is 2
Since it is after the first time (S312: NO), only the detection sensor to be driven is driven in step S314. The detection sensor to be driven is determined in step S326 or S328 as described above, and becomes one of the X-axis detection sensor and the Y-axis detection sensor.

When the shutter is released (step S315: YES), steps S316 and S316 are performed.
The process 317 is performed. At this time, one of the vertical image shift amount and the horizontal image shift amount is the same direction calculated at the time of the first shooting by the process performed in step S327 or S329. The other image displacement amount is calculated by using the detection sensor that is driven.

Incidentally, if it is determined that the amount of image shift in the vertical direction is large at the time of the first shooting, the process of driving the X-axis detection sensor is performed at step S314, and the horizontal direction calculated at the time of the first shooting is performed at step S317. That is, a process of calculating the image deviation amount as it is as the image deviation amount in the horizontal direction after the second time is performed.

Thereafter, a process for estimating the amount of camera shake (step S318) and a process for correcting the shooting condition (step S319) are performed. If the shooting has been performed for the second time or later (step S320: NO), the shooting mode determination process (step S311) is performed again. ) And the process for the second time and later is repeated. Then, when the shooting mode ends (S311: NO), the processing of the camera shake detection apparatus in the second embodiment is ended.

As described above, the processing in the second embodiment has been described using the flowchart. As is apparent from the description, according to the second embodiment, two detection sensors are used for the first shooting while the shooting mode is continued. The amount of camera shake is estimated by driving, and during the second and subsequent shootings, only the detection sensor corresponding to the direction determined to have the larger image shift amount during the first shooting is driven to estimate the amount of camera shake. Therefore, for the second and subsequent shootings, the amount of image misalignment generated in the captured image by one detection sensor can be suppressed, and current consumption associated with driving of the detection sensor can be suppressed. In addition, it is possible to provide a camera shake detection device that suppresses a reduction in battery life.

As described above, according to the first and second embodiments embodying the present invention, the amount of deviation of the image of the subject generated in the captured image by the detection sensor is suppressed, and the shortening of the battery life is suppressed. A camera shake detection device can be provided.

As mentioned above, although this invention was demonstrated using two Examples, this invention is not limited to such Examples at all, and can be implemented with various forms within the range which does not deviate from the meaning of this invention. Of course.

(First modification)
For example, in the first embodiment, one detection sensor to be driven is the X-axis detection sensor for detecting the rotation speed about the pitch around the X axis described in FIG. It is good also as a Y-axis detection sensor which detects the rotational speed about.

If it is predicted that camera shake will be more likely to occur in the horizontal direction than in the vertical direction when shooting, Y
By calculating the actual lateral image shift amount of the subject in the captured image by the axis detection sensor, it can be expected that the estimated camera shake amount is close to the actual camera shake amount. Therefore, the probability that the shooting conditions can be corrected so as to correctly suppress the image shift amount of the subject increases.

(Second modification)
In the first embodiment, when the amount of image misalignment in the horizontal direction is calculated, image analysis is performed using the actually captured image. However, the image is not captured but is displayed on a monitor (not shown) provided in the camera. Image analysis may be performed using through images displayed at predetermined time intervals.

As can be seen from the description in the embodiment, the actually captured image is captured under the image capturing condition corrected based on the estimated amount of camera shake, so that the image displacement amount in the horizontal direction is suppressed. It is estimated that there are many cases. Therefore, in such a case, the lateral image shift amount calculated by image analysis of the captured image is calculated as a shift amount smaller than the image shift amount of the subject caused by the actual horizontal camera shake at the time of shooting. Will be.

On the other hand, a through image is an image of a subject that is captured by an image pickup device under shooting conditions before correction based on an estimated amount of camera shake, and thus a horizontal image shift obtained by image analysis of the shot image. It can be expected to be closer to the image displacement amount of the subject caused by the actual lateral camera shake at the time of shooting than the amount. Therefore, although a memory for storing the through image is required, the amount of camera shake estimated using the amount of horizontal image shift obtained by image analysis of the through image is more likely to approach the actual amount of camera shake. . Of course, the through image used for image analysis is preferably the closest image in terms of time during actual shooting.

(Third Modification)
In the second embodiment, the two detection sensors to be driven are detection sensors that detect the rotation speed around the X axis and the rotation speed around the Y axis. However, the two detection sensors are rotation speeds around the X axis. And a detection sensor for detecting the rotation speed around the Z axis. Alternatively, the two detection sensors may be detection sensors that detect the rotational speed around the Y axis and the rotational speed around the Z axis.

In the second embodiment, since it is assumed that rotation around the Z-axis is difficult to occur, the X-axis detection sensor and the Y-axis detection sensor are used. However, depending on the shooting method of the photographer, the structure of the camera, etc.
A case where rotation around an axis is likely to occur is also assumed. Therefore, in such a case, the amount of camera shake can be estimated more correctly by detecting the rotational speed around the Z axis.

(Fourth modification)
In the second embodiment, in the second and subsequent shootings, either the horizontal image shift amount or the vertical image shift amount is used as the image shift amount calculated in the first shooting as it is. The amount of deviation was calculated. In this modification, only the image shift amount calculated from one detection sensor that is driven is used at the second and subsequent shootings, and the horizontal or vertical image shift amount calculated at the first shooting is used. It is good also as not using.

Depending on the shooting method of the photographer, there may be a case where a large amount of camera shake occurs in the horizontal direction with respect to the vertical direction, or a large amount of camera shake occurs in the vertical direction with respect to the horizontal direction. In such a case, the image shift amount is calculated in the second and subsequent shootings only in the direction of the larger image shift amount determined in the first shooting, and is estimated using the image shift amount in the one direction. Even with the amount of camera shake, it can be expected to be close to the actual amount of camera shake that occurs during shooting. In this way, in the second and subsequent shootings, only one image shift amount is processed, and the processing load can be reduced.

(5th modification)
In the first and second embodiments, the two image shift directions in the vertical direction and the horizontal direction are orthogonal to each other. However, the present invention is not limited to this, and the two image shift directions may be directions that are not orthogonal to each other. Good. For example, due to the structure of the camera, the movement of the camera may move significantly in a specific direction. Alternatively, when the camera includes two detection sensors in the second embodiment, it may be difficult to provide the two detection sensors in an orthogonal state due to the structure of the camera. In such cases, it is preferable to calculate a noticeable moving direction as the image shift direction, or to calculate a direction according to the axial direction of the provided detection sensor as the image shift amount. By doing this, the direction of movement of the camera and the direction of detection of the detection sensor become the same, and the probability of appropriately estimating the amount of camera shake increases.

110 ... X-axis detection sensor, 111 ... Y-axis detection sensor, 120 ... A / D, 121 ... A
/ D, 130 ... drive circuit, 131 ... drive circuit, 140 ... input I / F, 150 ... CPU, 1
60 ... RAM, 170 ... ROM, 180 ... output I / F, 190 ... shooting circuit, 200 ... camera shake detection device, 200a ... detection sensor, 200b ... first image shift amount calculation unit, 200c ...
Second image deviation amount calculation unit, 200d... Image deviation amount recording unit, 200e.
00f: photographing condition correction unit, 300: camera shake detection device, 300a: detection sensor, 300b
... image deviation amount calculation unit, 300c ... image deviation amount selection unit, 300e ... camera shake amount estimation unit, 300
f ... Shooting condition correction unit, 300g ... Shooting mode determination unit, 300h ... Shooting number recording unit.

Claims (6)

A camera shake detection device that detects the amount of camera shake that occurs during shooting of a subject,
A first rotation speed and a second rotation speed for detecting a first rotation speed and a second rotation speed, each of which is a rotation speed around each of the first and second axes, which are predetermined two axes of the camera. Having a first detection sensor and a second detection sensor;
at least,
(1) The first detection sensor is driven to detect the first rotation speed, and a first image shift amount that is an image shift amount in a first direction is detected with respect to an image of a subject photographed by the camera. Calculating based on the first rotational speed, or
(2) The second detection sensor is driven to detect the second rotation speed, and a second image shift amount that is an image shift amount in the second direction is detected for an image of a subject photographed by the camera. An image shift amount calculation unit that performs calculation based on the second rotation speed;
A detection sensor control unit that compares the calculated first image shift amount with the calculated second image shift amount and prohibits driving of the detection sensor corresponding to the smaller image shift amount; Camera shake detection device. The camera shake detection device according to claim 1,
When the detection sensor control unit prohibits the driving of the second detection sensor, the first sensor
Using the image shift amount and the second image shift amount before the detection sensor control unit prohibits driving of the second detection sensor, the camera shake amount of the camera is estimated,
When the detection sensor control unit prohibits driving of the first detection sensor, the second
And a camera shake amount estimation unit that estimates the camera shake amount of the camera using the first image shift amount before the detection sensor control unit prohibits driving of the first detection sensor. A camera shake detection device characterized by comprising: The camera shake detection device according to claim 1 or 2,
The camera shake detection device according to claim 1, wherein the first direction and the second direction of the captured image are orthogonal to each other. A camera that detects the amount of camera shake that occurs when shooting a subject,
A first rotation speed and a second rotation speed for detecting a first rotation speed and a second rotation speed, each of which is a rotation speed around each of the first and second axes, which are predetermined two axes of the camera. Having a first detection sensor and a second detection sensor;
at least,
(1) The first detection sensor is driven to detect the first rotation speed, and a first image shift amount that is an image shift amount in a first direction is detected with respect to an image of a subject photographed by the camera. Calculating based on the first rotational speed, or
(2) The second detection sensor is driven to detect the second rotation speed, and a second image shift amount that is an image shift amount in the second direction is detected for an image of a subject photographed by the camera. An image shift amount calculation unit that performs calculation based on the second rotation speed;
A detection sensor control unit that compares the calculated first image shift amount with the calculated second image shift amount and prohibits driving of the detection sensor corresponding to the smaller image shift amount; camera. First detection for detecting a first rotation speed and a second rotation speed, which are rotation speeds around the respective axes, for a first axis and a second axis that are predetermined two axes. A camera shake detection method for detecting a camera shake amount of a camera having a sensor and a second detection sensor,
at least,
(1) The first detection sensor is driven to detect the first rotation speed, and a first image shift amount that is an image shift amount in a first direction is detected with respect to an image of a subject photographed by the camera. Calculating based on the first rotational speed, or
(2) The second detection sensor is driven to detect the second rotation speed, and a second image shift amount that is an image shift amount in the second direction is detected for an image of a subject photographed by the camera. An image shift amount calculation step of performing calculation based on the second rotation speed;
A detection sensor control step of comparing the calculated first image shift amount with the calculated second image shift amount and prohibiting driving of the detection sensor corresponding to the smaller image shift amount. A camera shake detection method characterized by that. First detection for detecting a first rotation speed and a second rotation speed, which are rotation speeds around the respective axes, for a first axis and a second axis that are predetermined two axes. A camera shake detection program for detecting a camera shake amount of a camera having a sensor and a second detection sensor;
at least,
(1) The first detection sensor is driven to detect the first rotation speed, and a first image shift amount that is an image shift amount in a first direction is detected with respect to an image of a subject photographed by the camera. Calculating based on the first rotational speed, or
(2) The second detection sensor is driven to detect the second rotation speed, and a second image shift amount that is an image shift amount in the second direction is detected for an image of a subject photographed by the camera. An image shift amount calculation function for performing calculation based on the second rotation speed;
The computer has a detection sensor control function that compares the calculated first image shift amount with the calculated second image shift amount and prohibits driving of the detection sensor corresponding to the smaller image shift amount. A camera shake detection program characterized by being realized.

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