JPH1124120A - Image blurring correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a situation that precise image blurring correction is not performed because the center of angular vibration generated in an image pickup device is not aligned with the position of an optical axis angle varying mechanism. SOLUTION: A CPU 15 detects angular displacement, based on an output signal from an angular velocity sensor 13, and calculates a distance from a given reference point in a video camera 1 to a subject 20, based on an output signal from a range-finding sensor 17. The CPU 15 calculates an optical axis correction angle being an angle that an optical axis angle should be bent by an optical axis angle varying device 11, based on the detected angular displacement and the calculated distance. The CPU 15 compares the calculated optical axis correction angle with an output signal from a lens position sensor 12 and controls an optical axis angle varying device driving device 14 so that the bent angle of the optical axis angle by the device 11 may be the calculated optical axis correction angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle formed between an optical axis on an incident side and an optical axis on an outgoing side by driving an optical element (referred to as a transmitted optical axis angle or simply an optical axis angle in the present application). The present invention relates to an image shake correction device that corrects image shake caused by hand shake or the like by changing the image shake.

[0002]

2. Description of the Related Art In recent years, as a video camera, a camera having an image shake correcting device for correcting (suppressing) a shake (shake) of a captured image due to a hand shake of an operator or a vibration of a vehicle when mounted on a vehicle has been put to practical use. ing. As an image blur correction device, an optical device that bends an optical axis in a photographing optical system and an electric device that electrically corrects a photographed image are known. Of these, the optical image blur correction device can obtain high image quality and high correction accuracy on the telephoto side, and is therefore often used for higher-end models of home video cameras. In recent years, it has begun to be applied to a video camera for broadcasting business.

In an optical image blur correction apparatus, an optical axis angle variable device for bending an optical axis in a photographing optical system is controlled to correct an optical axis angle corresponding to an angular vibration generated in a camera. It is a general principle to suppress the fluctuation of the captured image as a result. In general, the optical axis angle varying device is often installed in front of a normal lens configuration.

[0004]

However, in the above-described optical image blur correction device, when a near subject is adjusted to be stationary, a far subject is shaken, and conversely, a far subject is still. There has been a problem that the adjustment causes a phenomenon that a nearby subject shakes. This problem and similar problems are caused by the fact that the center of the angular vibration generated in the camera generally does not coincide with the position of the optical axis angle variable mechanism. This will be described with reference to FIG.

FIG. 13 is a vector diagram showing a necessary positional relationship in order to easily explain the above problem. In this drawing, in the plane including the trajectory of the optical axis angle varying mechanism caused by the angular vibration of the camera, the center of the angular vibration of the camera is set as the origin, and the direction of the center line of the photographing optical axis is in the X direction, which is orthogonal to the X direction. The direction is the Y direction, and the coordinates in the X direction and the Y direction are represented by (x, y).

In FIG. 13, an object at a point A (a, 0) is passed through a variable optical axis angle mechanism at a point R (r, 0) by a camera equipped with a certain optical image blur correction device. Is taken. At this time, it is assumed that the center line of the photographing optical axis is on a straight line connecting point R and point A. In such a system, if an angular displacement α occurs around the point C (0, 0) in the camera, this position C is generally different from the position R of the optical axis angle varying mechanism. The mechanism is
The movement from the point R to a point R ′ (r · cos α, r · sin α) on the trajectory 111 of the optical axis angle varying mechanism due to the angular vibration of the camera. Here, in order to cause the center line of the optical axis to pass through the point A by bending the optical axis by the optical axis angle variable mechanism at the point R ′ when the angular displacement α occurs, The optical axis angle varying mechanism may be controlled so that the optical axis is bent by β shown in the figure at R ′, and it is assumed that the optical image blur correction apparatus has been optimized and adjusted as described above.

Next, when an object at a point B (b, 0) different from the point A is photographed using a camera equipped with the image blur correction device adjusted as described above. Suppose also that an angular displacement α of the same magnitude occurs in the camera. Originally, in order for the center of the optical axis to pass through a certain point B of the subject, the optical axis may be bent by the angle γ in the figure, but in the image shake correction apparatus adjusted as described above, After all, the optical axis is bent by the angle β.
As a result, at a position at a distance equal to the distance from the camera to the subject B, L _d
The subject image moves with only the error width.
Although FIG. 13 shows a case where the subject position at the time of actual shooting is farther than the subject position optimized by the image shake correction apparatus, it is obvious that the same problem occurs even if the positional relationship is reversed. It is.

There is no conventional image blur correction device having a means for solving the above-mentioned problem. This problem,
The smaller the ratio L ₀ / r of the distance r between the center of angular vibration C of the camera and the optical axis angle varying mechanism and the distance L ₀ (not shown) from the optical axis angle varying mechanism to the subject in FIG. It is easy to see from FIG. Generally, a consumer video camera has a very small device body,
As long as the camera is hand-held, the distance r between the center of the angular vibration of the camera and the optical axis angle variable mechanism is not so large, and therefore the problem tends to be inconspicuous, which is why the problem is not serious. Is assumed.

In recent years, however, in a video camera for broadcasting business in which an image stabilizing device has been installed, the video camera and the lens are large, and when the camera is used on a shoulder for photographing, the center of angular vibration is required. Is expected to have a considerable distance from the tip of the lens. That is, in a video camera for broadcast business, since the distance r between the center of angular vibration of the camera and the optical axis angle variable mechanism is generally considered to be large,
It is considered that the performance of the image blur correction device has not been sufficiently exerted because the above-described problem has become serious or since such a problem is difficult to ignore.

By the way, the description has been given so far as the distance between the center position of the angular vibration generated in the camera and the optical axis angle varying mechanism is fixed. However, in actuality, the angular vibration centered at various positions is generated. It can happen. In such a case, even if the image shake correction device is optimally adjusted so that a subject at a specific distance is stationary, if the state of occurrence of vibration changes, sufficient image shake correction capability for the specific subject is obtained. May not be able to be exhibited. This will be described with reference to FIG.

FIG. 14 is a diagram showing a necessary positional relationship in a vector diagram in order to easily explain the above problem. In this drawing, in the plane including the trajectory of the optical axis angle varying mechanism due to the angular vibration of the camera, the initial position of the optical axis angle varying mechanism is the origin, and the direction of the center line of the photographing optical axis is the X direction. Is defined as a Y direction, an X direction,
Each coordinate in the Y direction is represented by (x, y).

[0012] Now, in FIG. 14, through the optical axis angle variation mechanism in a certain point in the optical image blur equipped with a camera correction device R ₀ (0,0), the point T _a (t _a, 0) It is assumed that a subject at a position is photographed, and when no shake occurs in the camera, the center line of the photographing optical axis is a point R ₀ and a point _Ta.
Are on a straight line connecting. Here, the point C _a (c _a ,
When 0) angular displacement about the occurred, through the optical axis angle variation mechanism has moved to the point R _a on the locus 121 of the optical axis angle variation mechanism of radius r _a to about the point C _a, as object at a point T _a passes through the optical center, when adjusting the image blur correction apparatus, for example with respect to the angular displacement alpha, the optical axis is β
Only bend.

While photographing a subject at the same distance by using a camera equipped with the image blur correction device adjusted as described above, this time, with the point C _b (c _b , 0) as the center, When the same angular displacement α occurs, if for object at a point T _a is to pass through the center line of the optical axis,
This time, the optical axis angle variation mechanism has moved to the point R _b on the locus 122 of the optical axis angle variation mechanism of radius r _b around the point C _b, it is necessary to bend the optical axis by an angle γ .

[0014] However, in the optical image shake correction apparatus of a general configuration, for the same angular displacement alpha, also because the same correction angle β is applied, the center of the optical axis without passing through the point T _a to, will be passing through the point _{T b (t b, 0)} , the captured image of the subject in the T _a point was photographed object is completely possible that the image blur correction is not performed with respect to the generated angular frequency become. Such a problem is caused by a change in the distance from the center position of the angular vibration generated in the camera to the optical axis angle variable mechanism. Fundamentally, the center of the angular vibration generated in the camera and the optical axis angle are changed. This is because the positions of the variable mechanisms do not match.

In general, since the distance to the subject varies, the second problem described above is often not the cause of the deterioration of the performance of the image blur correction device. However, under specific conditions, a shooting situation in which the distance to the subject is determined to some extent can be assumed. For example, in a marathon broadcast, a mobile broadcast van that runs a certain distance ahead of the leading runner,
This may be a case where the shooting specified for the leading runner is performed, or a case where the shooting concentrated on the vicinity of the home base from the side of the center back screen in baseball broadcasting is performed. In such a situation, since the center position of the angular vibration generated in the camera is various, it is said that the conventional image blur correction device does not exhibit the highest performance or is difficult to adjust optimally. Probability is high.

As described above, the second problem is particularly supposed to be taken in a vehicle or the like while receiving various types of angular vibration. In such a case, the distance to the subject tends to be large. It can be assumed that this was not a problem because of the fact that the frequency of in-vehicle photography is not so high for home use.

However, in the field where the image blur correction device for broadcasting has been strongly demanded, it is necessary to exhibit a sufficient image blur correction capability under shooting conditions such as in-vehicle use or helicopter mounting. It is not an exaggeration to say that it is indispensable as a shake correction device. Under such a situation in which various kinds of vibrations can occur, without solving the second problem due to the difference in the center position of the angular vibration, It is difficult to demonstrate full image blur correction capability.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an object of the present invention is to provide a precise image blur due to the inconsistency between the center of the angular vibration generated in the imaging device and the position of the optical axis angle variable device. An object of the present invention is to provide an image blur correction device capable of preventing a case where correction is not performed.

[0019]

According to a first aspect of the present invention, there is provided an image blur correction apparatus which is interposed in an optical path for forming an image in an image pickup apparatus, and which is driven by an optical element with respect to an optical axis on an incident side. An optical axis angle variable device capable of changing an angle formed by the optical axis on the emission side, a shake detection unit for detecting a shake of the imaging device, and a distance information acquisition unit for acquiring information on a distance from the imaging device to a subject. And an image shake correction control unit that controls the optical axis angle variable device to correct image shake based on the detection output of the shake detection unit and the information on the distance acquired by the distance information acquisition unit. .

According to a fifth aspect of the present invention, there is provided an image blur correction apparatus which is inserted in an optical path for forming an image in an image pickup apparatus, and which drives an optical element so that an optical axis on an output side with respect to an optical axis on an incident side. An optical axis angle variable device capable of changing an angle to be formed, a shake detecting means for detecting a shake of the imaging device, and an angular vibration center position for detecting information corresponding to a center position of the angular vibration occurring in the imaging device Information detection means, and image shake correction control means for controlling the optical axis angle variable device to correct image shake based on the detection output of the shake detection means and the information detected by the angular vibration center position information detection means. It is provided.

According to a seventh aspect of the present invention, there is provided an image blur correcting apparatus which is inserted in an optical path for forming an image in an image pickup apparatus, and which drives an optical element so that an optical axis on an exit side with respect to an optical axis on an incident side. An optical axis angle variable device capable of changing an angle to be formed, a shake detection unit for detecting a shake of the imaging device, a distance information obtaining unit for obtaining information on a distance from the imaging device to the subject, Angular vibration center position information detecting means for detecting information corresponding to the center position of the angular vibration being performed; detection information of the shake detecting means and distance information obtained by the distance information obtaining means; and angular vibration center position information detecting means. Image blur correction control means for controlling the optical axis angle variable device based on the detected information to correct the image blur.

In the image shake correcting apparatus according to the first aspect, the shake of the image pickup device is detected by the shake detecting means, the information on the distance from the image pickup apparatus to the subject is obtained by the distance information obtaining means, and the image shake correction control means. The optical axis angle variable device is controlled based on the detection output of the shake detecting means and the information on the distance acquired by the distance information acquiring means, and the image shake is corrected.

According to a fifth aspect of the present invention, the shake detecting means detects the shake of the image pickup apparatus, and the angular vibration center position information detecting means detects the information corresponding to the center position of the angular vibration generated in the image pickup apparatus. Is detected, and the optical axis angle variable device is controlled by the image shake correction control means based on the detection output of the shake detection means and the information detected by the angular vibration center position information detection means to correct the image shake. .

According to a seventh aspect of the present invention, a shake detecting means detects a shake of the image pickup apparatus, a distance information obtaining means obtains information on a distance from the image pickup apparatus to a subject, and detects angular vibration center position information. The information corresponding to the center position of the angular vibration generated in the imaging device is detected by the means, and the information of the distance obtained by the shake detection means and the distance information and the angular vibration obtained by the distance information obtaining means are detected by the image shake correction control means. The optical axis angle varying device is controlled based on the information corresponding to the center position of the angular vibration detected by the center position information detecting means, and the image shake is corrected.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a side view showing the external appearance of the video camera equipped with the image blur correction device according to the first embodiment of the present invention. The video camera 1 has a camera lens unit 2, and the image blur correction device 10 according to the present embodiment has an adapter-type main body that is detachably attached to the tip of the camera lens unit 2. .
The power to the image blur correction device 10 is supplied by the power cable 3
Through the power supply of the video camera 1.

FIG. 1 is a block diagram showing a configuration of an image shake correcting apparatus 10 according to the present embodiment. The image blur correction device 10 includes an optical axis angle variable device 11 that can change a transmitted optical axis angle, which is an angle formed by an output side optical axis and an incident side optical axis, and the optical axis angle variable device 11. The video camera 1 includes a lens position sensor 12 for detecting the position of a lens inside the camera, and an angular velocity sensor 13 as shake detection means for detecting shakes in the horizontal and vertical directions of the video camera 1. As the angular velocity sensor 13, for example, two gyro sensors that detect the angular velocities of horizontal and vertical shakes, respectively, are used.

The image blur correction device 10 further includes an optical axis angle variable device driving device 14 for driving the optical axis angle variable device 11,
A CPU (central processing unit) 15 as image shake correction control means for controlling the optical axis angle variable device driving device 14;
And a non-volatile memory 16 connected to the PU 15. Although not shown, the CPU 15 includes this CPU.
15 stores a ROM (Read Only Memory) storing programs to be executed and RA serving as a working area.
M (random access memory) is connected.
The non-volatile memory 16 is used to store adjustment parameter values described later.

The image blur correction device 10 according to the present embodiment
Further includes a distance measuring sensor 17 as distance information acquiring means for measuring the distance from the video camera 1 to the subject 20. The CPU 15 receives the output signals of the lens position sensor 12, the angular velocity sensor 13, and the distance measurement sensor 17, and based on these output signals, the optical axis angle varying device 11
Is controlled to correct the image blur. Note that the distance measurement sensor 17 may be provided on the main body of the image blur correction device 10 attached to the tip of the camera lens unit 2, may be provided on the camera lens unit 2, or may be provided on a video camera. It may be provided on one side. Even when the distance measurement sensor 17 is provided on the camera lens unit 2 or the video camera 1 side, the distance measurement sensor 17 is a component of the image blur correction device 10 according to the present embodiment.

As the optical axis angle varying device 11, as disclosed in, for example, JP-A-57-25803, JP-A-6-070220, and JP-A-6-281889, a plano-concave lens having an approximate spherical curvature is used. 11a and plano-convex lens 11b
Are rotatably supported such that the spherical surfaces face each other, thereby forming a variable apex angle prism.
11b, the two lenses 11a,
By changing the angle formed by the planes 11b, that is, the apex angle of the apex angle variable prism, it is possible to use a device for changing the transmitted light axis angle.

Other examples of the optical axis angle varying device 11 include, for example, JP-A-6-118471 and JP-A-7-16823.
As shown in each publication of No. 5, an afocal optical system is configured by combining one concave lens and one convex lens, and each lens is moved in a direction perpendicular to the optical axis and orthogonal to each other, so that the transmission is achieved. A device for changing the optical axis angle or, as shown in, for example, Japanese Patent Application Laid-Open No. 61-269572, supports a pair of glass substrates in a rotatable manner and seals a liquid between the pair of glass substrates to form a top plate. A device may be used in which a variable angle prism is formed, and the angle between the pair of glass substrates, that is, the vertical angle of the variable vertical angle prism, is changed to change the transmitted light axis angle.

The distance measuring sensor 17 can measure the distance from the video camera 1 to the subject 20 at an arbitrary position, regardless of whether the absolute position of the subject 20 is detected or the relative position of the subject to the video camera 1 is detected. Any method may be used, and various methods devised and put to practical use up to now can be used.

Here, with reference to FIG. 3, as an example, a schematic configuration of the distance measuring sensor 17 when the external light triangular method is used will be described. The distance measuring sensor 17 in this example is
Two lenses 21 and 2 arranged at a predetermined distance W
2 and two optical sensor arrays 23 and 2 on which the image of the subject 20 formed by the lenses 21 and 22 is projected.
And a phase difference detection circuit 25 that receives the output signals of the optical sensor arrays 23 and 24 and detects the phase difference between the subject images on the optical sensor arrays 23 and 24. The optical sensor arrays 23 and 24 include lenses 21 and 22, respectively.
It has a plurality of optical sensors arranged along the two arrangement directions.

Next, the operation principle of the distance measuring sensor 17 of the example shown in FIG. 3 will be described. First, each lens 21, 22
Are O ₁ and O _2, and the midpoint between O ₁ and O ₂ is Q. Points where the optical axes of the lenses 21 and 22 intersect with the optical sensor arrays 23 and 24 are defined as Q ₁ and Q ₂ . The distance between the lenses 21 and 22 and the optical sensor arrays 23 and 24 is represented by f.
_e . Points on the optical sensor arrays 23 and 24 corresponding to the point P on the subject 20 are defined as P ₁ and P ₂ .

Here, distances between P ₁ and Q ₁ are Ph ₁ , P
Assuming that the distance between ₂ and Q ₂ is Ph ₂ , △ PO ₁ Q and △ O
_{Since 1} P ₁ Q ₁ is similar and △ PO ₂ Q and △ O ₂ P ₂ Q ₂ are similar, the distance g from the point Q to the point P on the subject 20 is given by the following equation.

G = W · _fe / (Ph ₁ + Ph ₂ ) = W · _fe / Ph where Ph = Ph ₁ + Ph ₂

Here, since W and _fe are constants, the phase difference Ph = Ph of the two subject images on the optical sensor arrays 23 and 24 is obtained.
If Ph ₁ + Ph ₂ is detected, the distance g can be obtained. The phase difference detection circuit 25 detects the phase difference Ph, obtains the distance g from the above equation, and obtains a signal 26 representing the distance g.
Is sent to the CPU 15. The phase difference Ph can be detected by, for example, the following method. That is, in this method, an arbitrary point in each of the optical sensor arrays 23 and 24 is set as a center point, and a difference between outputs of the optical sensors located at the same position as viewed from the center point is obtained. the distance between the point Q _1, the central point of the optical sensor array 23 when the minimum, the sum of the distance between the point Q ₂ and the center point of the optical sensor array 24 and the phase difference Ph.

Next, the operation of the image blur correction device 10 according to the present embodiment will be described. In the image blur correction apparatus 10, the CPU 15 integrates the output signal of the angular velocity sensor 13, for example, after passing through a high-pass filter, and detects the angular displacement. Further, the CPU 15 includes a distance measuring sensor 17.
, The distance from a predetermined reference point in the video camera 1 to the subject 20 is calculated. And
The CPU 15 calculates an optical axis correction angle, which is an angle at which the optical axis angle should be bent, based on the detected angular displacement and the calculated distance. The CPU 15 further compares the calculated optical axis correction angle with the output signal of the lens position sensor 12 so that the bending angle of the optical axis angle by the optical axis angle variable device 11 becomes the calculated optical axis correction angle. The shaft angle varying device driving device 14 is controlled. Thereby, the bending angle of the optical axis angle is reduced by the CPU 1
The optical axis angle varying device 11 is driven so that 5 becomes the calculated optical axis correction angle, and the image blur is corrected.

The image blur correction apparatus 10 according to the present embodiment
In particular, by controlling the image blur correction using the distance from the predetermined reference point in the video camera 1 to the subject 20, when the near subject is adjusted to be stationary, the distant subject shakes, and conversely, When a subject is adjusted to be stationary, a phenomenon in which a nearby subject shakes can be prevented from occurring.

Hereinafter, the control of image blur correction according to the present embodiment will be described in detail with reference to FIG. In FIG. 4, in the plane including the trajectory of the optical axis angle varying device 11 due to the angular vibration of the video camera 1, the center of the angular vibration of the video camera 1 is set as the origin, and the direction of the center line of the photographing optical axis is set in the X direction. , The direction orthogonal to this is the Y direction, the X direction,
Each coordinate in the Y direction is represented by (x, y). In FIG. 4, it is assumed that the center of the angular vibration of the video camera 1 is at a point C (0, 0), and the center position of the optical axis angle varying device 11 at rest is at a point R (r, 0). The position of the subject is set to a point D (d, 0).

In this embodiment, the video camera 1
The distance r between the center C of the angular vibration and the center position R of the optical axis angle varying device 11 is a constant value. Generally, in a situation where the video camera 1 is photographed on a shoulder or handheld, angular vibrations often occur around the position of the shoulder or the wrist. In such a case, as described above, the video camera 1 is used. Of the angular vibration of the optical axis and the center position R of the optical axis angle varying device 11
Can be specified as a constant value in advance.

In such a system, if an angular displacement α around the point C (0, 0) occurs in the video camera 1, the optical axis angle varying device 11
Moves to a point R '(r.cos.alpha., R.sin.alpha.) On the trajectory 28 of the optical axis angle varying device 11 due to the angular vibration of. Here, it is assumed that the optical axis correction angle by the optical axis angle varying device 11 necessary for the center line of the optical axis to pass through the point D is γ. When the distance r between the center C of the angular vibration of the video camera 1 and the center position R of the optical axis angle varying device 11 is a fixed value, the optical axis correction angle γ is calculated from the angular displacement α and the predetermined reference point of the video camera 1 It is clear from FIG. 4 that the distance can be easily obtained if the distance to the subject 20 is known. In the present embodiment, the distance d from the center C of the angular vibration of the video camera 1 to the subject 20 is used as the distance from the predetermined reference point of the video camera 1 to the subject 20.

As shown in FIG. 4, from the center C of the angular vibration of the video camera 1 to the center position R of the optical axis angle varying device 11
The vector heading toward (R ′) is defined as r ^*, and the position D (d, d) of the subject is determined from the center position R (R ′) of the optical axis angle varying device 11.
If the vector heading to 0) is d ^* , the vectors r ^* ,
d ^* is represented by the following equations (1) and (2).

R ^* = (r · cosα, r · sinα) (1) d ^* = (dr · cosα, −r · sinα) (2)

Here, the optical axis correction angle, that is, the angle γ formed by the vector r ^* and the vector d ^* is obtained by the following equation (3).

Cosγ = r ^* · d ^* / (| r ^* | · | d ^* |) (3)

Here, r ^* · d ^* , | r ^* |, | d ^* |
Are given by the following equations (4) to (6), respectively.

[0047] ^{r * · d * = r ·} cosα (dr · cosα) -r 2 · sin 2 α = dr · cosα-r 2 · cos 2 α-r 2 · sin 2 α = dr · cosα-r ² … (4)

| R ^* | = r (5)

| D ^* | = {(dr · cos α) ² + r ² · sin ² α} = √ (d ² −2dr · cos α + r ² cos ² α + r ² · sin ² α) = √ (d ² − 2dr · cosα + r ² ) (6)

Therefore, when the equations (4) to (6) are substituted into the equation (3), the following equation (7) is obtained.

Cosγ = r (d · cosα−r) / {r · √ (d^Two-2dr · cosα + r ^Two )｝ = (D · cosα−r) / √ (d^Two-2dr · cosα + r^Two) ∴γ = cos^-1｛(D · cosα-r) / √ (d^Two-2dr · cosα + r^Two )｝… (7)

From the equation (7), when the distance r is a constant value, when the angular displacement α and the distance d are determined, the optical axis correction angle γ is uniquely determined. The CPU 15 obtains the angular displacement α in the equation (7) based on the output signal of the angular velocity sensor 13 and obtains the distance d in the equation (7) based on the output signal of the distance measuring sensor 17. Substitute in 7) to calculate the optical axis correction angle γ.

By the way, even if the optical axis correction angle γ is obtained as described above, the outputs of the angular velocity sensor 13 and the lens position sensor 12 are generally analog values. Lens 11a, 1
Regarding how much 1b should be moved, there is a variation among the image shake correction apparatuses 10. Therefore, in order to completely stop the image captured by the video camera 1 of the subject 20 by the image shake correction function, the following method is required. In addition, it is necessary to adjust parameters for each image blur correction apparatus 10.

Here, since the optical axis correction angle γ is generally a small angle of 1 degree or less, the target value of the positions of the lenses 11 a and 11 b of the optical axis angle varying device 11 at this time, that is, the output of the lens position sensor 12 Assuming that the target value can be linearly expressed as k · γ, k is a parameter to be adjusted for each image blur correction device 10.

In the present embodiment, at the time of adjustment, the subject is placed at a certain reference position, and the parameter k is adjusted so that the subject always passes through the center of the optical axis even if an angular displacement α occurs.
Then, the value of the parameter k as the adjustment result is stored in the nonvolatile memory 16. At the time of actual photographing, the CPU 15 obtains the optical axis correction angle γ by the equation (7), then obtains k · γ by referring to the value of the parameter k stored in the nonvolatile memory 16, and obtains the value of the lens position sensor 12. The optical axis angle varying device 11 is controlled so that the output becomes k · γ.

As described above, according to the image shake correcting apparatus 10 of the present embodiment, the CPU 15
The optical axis angle varying device 11 is controlled based on the output of the angular velocity sensor 13 and the output of the distance measuring sensor 17 to correct the image blur, so that the center of the angular vibration generated in the video camera 1 and the light There is a case where precise image shake correction is not performed due to the mismatch of the position of the axis angle variable device 11. Specifically, when a near subject is adjusted to be stationary, a far subject shakes, and conversely, a far subject is shaken. If the subject is adjusted so as to be stationary, it is possible to prevent a phenomenon in which a nearby subject shakes.

FIG. 5 is a block diagram showing a configuration of an image blur correction device according to a second embodiment of the present invention. The image blur correction device 30 according to the present embodiment is applied to the video camera 1 that is configured to perform focus adjustment manually. The video camera 1 to which the image blur correction device 30 is applied includes a focus ring 31 and a focus distance information generation unit that detects a rotational position of the focus ring 31 and outputs focus distance information 33 in the camera lens unit 2. 32. The image blur correction device 30 according to the present embodiment does not include the distance measurement sensor 17 according to the first embodiment, and
U15 inputs the focus distance information 33 from the focus distance information generation unit 32 of the video camera 1.

The focus ring 31 is used to adjust the focus by manually moving a focus lens (not shown), and is provided rotatably with respect to the lens barrel of the camera lens unit 2. Focus distance information generation unit 3
Reference numeral 2 has, for example, a potentiometer linked to the focus ring 31, detects the rotational position of the focus ring 31, and outputs focus distance information 33 corresponding to the rotational position. The focus distance information 33 is information on the distance from a predetermined reference point of the video camera 30 to the subject 20 to which the photographer intends to photograph in focus. In the case of a video camera with an integrated lens, the focus distance information generation unit 32 is provided inside the video camera, and it is easy to extract the focus distance information 33 from inside the video camera. Further, even a single lens for broadcasting business or the like, which has the focus distance information generating unit 32 and can output the focus distance information 33 to the outside, has already been commercialized.

When the focus distance information 33 output from the focus distance information generation unit 32 is a digital value, it can be directly input to the CPU 15.
If the focus distance information 33 is an analog value, the focus distance information 33 is converted from analog to digital,
The data is input to the CPU 15.

In the present embodiment, the focus ring 31 is adjusted by the photographer so that the subject 20 to be photographed is in focus. At this time, the focus ring 3
One rotation position is detected, and focus distance information 33 corresponding to the rotation position is output and input to the CPU 15.

The CPU 15 obtains the angular displacement α in the equation (7) based on the output signal of the angular velocity sensor 13, calculates the distance d in the equation (7) based on the focus distance information 33, Substitute in 7) to calculate the optical axis correction angle γ. After obtaining the optical axis correction angle γ by equation (7), the CPU 15 obtains k · γ by referring to the value of the parameter k stored in the nonvolatile memory 16, and the output of the lens position sensor 12 is k · γ. The optical axis angle varying device 11 is controlled so as to be γ.

As described above, according to the image blur correction apparatus 30 according to the present embodiment, the focus ring 31
Since the precise image blur correction is performed using the focus distance information 33 from the focus distance information generation unit 32 that detects the rotation position of the distance, the distance as in the distance measuring sensor 17 in the first embodiment is used. A special configuration for generating information is not required, and the configuration is simplified. Other configurations, operations, and effects in the present embodiment are the same as those in the first embodiment.

FIG. 6 is a block diagram showing a configuration of an image blur correction device according to the third embodiment of the present invention. The image blur correction device 40 according to the present embodiment is applied to the video camera 1 having an autofocus function for automatically performing focus adjustment. This image blur correction device 40
The video camera 1 to which is applied a focusing lens (not shown) and a focusing lens driving unit 41 for driving the focusing lens in the camera lens unit 2.
And an autofocus processing unit 42 that controls the focus lens driving unit 41 to automatically perform focus adjustment and outputs focus distance information 43 in the main body. The focusing lens is the second lens.
As in the embodiment, the focus ring 31 can be used for manual adjustment. The focus lens driving unit 41 and the autofocus processing unit 42 correspond to an automatic focus adjustment unit in the present invention.

The image blur correction device 40 according to the present embodiment
In the first embodiment, the CPU 15 does not include the distance measurement sensor 17 in the first embodiment, and instead, the CPU 15 inputs focus distance information 43 from the autofocus processing unit 42. The focus distance information 43 is information on a distance from a predetermined reference point of the video camera 30 to the subject 20 focused by the autofocus processing unit 42.

The autofocus method in a video camera is described in the document “Hirotsugu Murashima et al .: Digital Integral Autofocus Video Camera, Technical Report of the Institute of Television Engineers of Japan, ITEJ.
Technical Report Vol.11.No.10.pp13 -18. (1987
Year)), TTL
(Through The Lens) method and external ranging method. Each scheme is further subdivided as follows. Any of these methods may be used for the autofocus function in the present embodiment.

(1) TTL focus detection (i) Contrast detection (ii) Correlation detection (TCL system) Distance measurement ... infrared irradiation (2) External distance measurement triangulation (i) Pair image matching (VAF system) (ii) Infrared Irradiation Propagation speed: Ultrasonic wave (sonar system)

FIG. 7 shows an example of the configuration of the focusing lens drive unit 41 and the autofocus processing unit 42 when the contrast detection method is used among the above methods and the focus is adjusted by the so-called hill-climbing servo method. It is shown. In this example, the digital integration described in the above-mentioned document is adopted.
In this example, the autofocus processing unit 42 receives a video signal 44 obtained by the video camera 1, inputs a video signal 44, and extracts a high-frequency component of the video signal 44 (hereinafter, referred to as HPF) 45. A detection circuit 46 for detecting the output signal, an A / D converter 47 for converting an output signal of the detection circuit 46 from analog to digital (hereinafter, referred to as A / D), and an output of the A / D converter 47 A gate 48 for selectively passing a signal and an integrating circuit 49 for integrating an output signal of the gate 48 for each field are provided. Auto focus processing unit 4
Reference numeral 2 denotes a synchronization separation circuit 50 for separating a synchronization signal from the video signal 44, a gate control circuit 51 for controlling the gate 48 based on the synchronization signal separated by the synchronization separation circuit 50, and an output of the integration circuit 49. A CPU 52 for inputting a signal, controlling the focus lens driving unit 41, and outputting focus distance information 43;

The focus lens drive section 41 in the example shown in FIG. 7 includes a motor 53 for driving the focus lens, a motor drive circuit 54 for driving the motor 53 under the control of the CPU 52, and a rotational position of the motor 53. And a motor position detection circuit 55 for sending information on the rotational position to the CPU 52.

In the autofocus processing section 42 in the example shown in FIG.
4, the gate control circuit 51 controls the gate 48 so as to pass only a signal in a predetermined area based on the synchronization signal. In the auto focus processing unit 42, the video signal 44 is output by the HPF 45.
The high frequency component of the HPF4 is extracted by the detection circuit 46.
5 is detected, the output signal of the detection circuit 46 is A / D-converted by the A / D converter 47, and the output signal of the A / D converter 47 is selectively passed by the gate 48. The output signal of the gate 48 is integrated for each field. The output signal of the integration circuit 49 is
Is input to

While monitoring the output signal of the integration circuit 49, the CPU 52 controls the motor drive circuit 54 so that the output signal of the integration circuit 49 becomes maximum. The motor drive circuit 54 drives the motor 53, which drives the focus lens. The motor position detection circuit 55 detects the rotation position of the motor 53 and outputs information on the rotation position to C
Send to PU52. The CPU 52 includes a motor position detection circuit 5
The focus distance information 43 is generated based on the information from No. 5 and sent to the CPU 15 of the image blur correction device 40.

In this embodiment, the focus lens driving unit 41 and the autofocus processing unit 42
The focusing lens is automatically driven so that the subject 20 is in focus. At this time, the focus distance information 43 is output by the autofocus processing unit 42 and input to the CPU 15.

The CPU 15 calculates the angular displacement α in the equation (7) based on the output signal of the angular velocity sensor 13, calculates the distance d in the equation (7) based on the focus distance information 43, Substitute in 7) to calculate the optical axis correction angle γ. After obtaining the optical axis correction angle γ by equation (7), the CPU 15 obtains k · γ by referring to the value of the parameter k stored in the nonvolatile memory 16, and the output of the lens position sensor 12 is k · γ. The optical axis angle varying device 11 is controlled so as to be γ.

As described above, according to the image blur correction apparatus 40 according to the present embodiment, precise image blur correction is performed using the focus distance information 43 from the autofocus processing section 42. Therefore, a special configuration for generating distance information, such as the distance measuring sensor 17 in the first embodiment, is not required, and the configuration is simplified.

In recent home video cameras, the autofocus function is indispensable.
In the future, there is a possibility that the autofocus function will be adopted in video cameras for broadcasting use. Therefore, it is very convenient for the video camera as a whole to improve the capability of the image blur correction function by integrating the autofocus function and the image blur correction function as in the present embodiment. Other configurations, operations, and effects in the present embodiment are the same as those in the first embodiment.

FIG. 8 is a block diagram showing a configuration of an image blur correction apparatus according to a fourth embodiment of the present invention. The image shake correction apparatus 60 according to the present embodiment is particularly suitable for adjusting the image shake correction apparatus so that a subject at a specific distance is still, even if the vibration occurrence state changes. The present invention solves the problem that sufficient image blur correction ability cannot be exhibited with respect to.

Image blur correction device 60 according to the present embodiment
Does not have the distance measurement sensor 17 in the first embodiment, but instead has two ground acceleration sensors 61 and 62 provided at two places in the video camera 1. The ground acceleration sensors 61 and 62 are configured to detect a ground acceleration, which is an acceleration with respect to the ground, as a parameter corresponding to a displacement at each position where these sensors are provided. Each output of the ground acceleration sensors 61 and 62 is input to the CPU 15. The ground acceleration sensors 61 and 62 correspond to the measuring means in the angular vibration center position information detecting means in the present invention, and the CPU 15 corresponds to the distance calculating means in the angular vibration center position information detecting means in the present invention.

It is preferable that the ground acceleration sensors 61 and 62 can detect at least the angular velocities in the horizontal and vertical directions. As the ground acceleration sensors 61 and 62,
For example, a gyro sensor is used. In addition, the ground acceleration sensors 61 and 62 do not necessarily need to be provided at two places in the video camera 1, and the video camera 1, members associated with the video camera 1, and the image shake correction device 60 are provided.
It is only necessary to be provided at at least two places in the main body.

Next, the operation of the image blur correction device 60 according to the present embodiment will be described. In the image blur correction device 60, the CPU 15 integrates the output signal of the angular velocity sensor 13, for example, after passing through a high-pass filter, and detects the angular displacement. The CPU 15 receives output signals from the ground acceleration sensors 61 and 62 and detects information corresponding to the center position of the angular vibration generated in the video camera 1 based on the input signals. Then, the CPU 15
An optical axis correction angle is calculated based on the detected angular displacement and information corresponding to the detected center position of the angular vibration.

Here, a method of obtaining the optical axis correction angle in this embodiment will be described. As can be seen from FIG. 14, if the distance from the center position of the angular vibration generated in the video camera 1 to the optical axis angle variable device, the distance from the optical axis angle variable device to the subject, and the angular displacement are known, The optical axis correction angle can be easily obtained. In the present embodiment, it is assumed that the distance from the optical axis angle varying device to the subject is constant. In this case, if the distance and the angular displacement from the center position of the angular vibration to the optical axis angle variable device are known, the optical axis correction angle can be obtained.

In the present embodiment, the distance from the center position of the angular vibration to the optical axis angle variable device is obtained as information corresponding to the center position of the angular vibration using the output signals of the two ground acceleration sensors 61 and 62. Like that.

Next, a method for detecting the distance from the center position of angular vibration to the optical axis angle varying device in the present embodiment will be described with reference to FIG. FIG. 9 shows an image shake correcting device 60 at the tip of the camera lens unit 2 of the video camera 1.
On the schematic diagram showing the state of wearing the ground acceleration sensor 6
In this figure, vectors and the like representing output signals of 1, 62 are superimposed. In FIG. 9, in a plane including the trajectory of the optical axis angle varying device 11 due to the angular vibration of the video camera 1,
The center of the angular vibration of the video camera 1 is defined as the origin, the direction of the center line of the photographing optical axis is defined as the X direction, the direction orthogonal thereto is defined as the Y direction, and the coordinates in the X and Y directions are represented by (x, y). ing. In FIG. 9, it is assumed that the center position of the angular vibration of the video camera 1 is at a point C (0, 0), and the center position of the optical axis angle varying device 11 at rest is at a point R (r, 0).
The distance from the center position C of the angular vibration of the video camera 1 to the center position between the ground acceleration sensors 61 and 62 is L ₁ , and the distance from the center position between the ground acceleration sensors 61 and 62 to the optical axis angle variable device 11 is Let L ₂ be the distance to the center position R. The distance between the ground acceleration sensors 61 and 62 is m
And The distance r from the center position C of the angular vibration of the video camera 1 to the center position R of the optical axis angle varying device 11 is L ₁ and L
It is the sum of _two . Here, the distance L ₂ is from a device-specific value, if the distance L ₁ is known, the distance r is obtained.

Here, when the angular displacement α occurs within a unit time, the position movement amount at the position where the ground acceleration sensor 61 is mounted is y ₁ , and the position movement amount at the position where the ground acceleration sensor 62 is mounted is y. _{Assume 2} .
If the angular displacement α is very small, each ground acceleration sensor 6
Since the position movement amounts y ₁ and y _{2 at the} positions where the _first and _second sensors 62 are attached are proportional to the distance from the center position C of the angular vibration of the video camera 1 to the positions where the respective ground acceleration sensors 61 and 62 are attached. , The following equation (8) holds.

Y ₁ : y ₂ = L ₁ + m / 2: L ₁ −m / 2 (8)

From this equation (8), L ₁ is given by the following equation (9)
Required by

L ₁ = (m / 2) · {(y ₁ + y ₂ ) / (y ₁ −y ₂ )} (9)

Therefore, the distance r to be obtained is given by the following equation (1)
0).

R = L ₂ + L ₁ = L ₂ + (m / 2) ｛{(y ₁ + y ₂ ) / (y ₁ −y ₂ )} (10)

In the equation (8), the position movement amounts y ₁ and y ₂ at the positions where the ground acceleration sensors 61 and 62 are attached are determined by the center position C of the angular vibration of the video camera 1.
Is used in proportion to the distance from the ground acceleration sensors 61 and 62 to the positions where the ground acceleration sensors 61 and 62 are mounted. However, the ground speeds y ₁ ′ and y ₂ ′ at the positions where the ground acceleration sensors 61 and 62 are mounted and , Ground acceleration y ₁ ″, y ₂ ″
Similarly, the distance from the center position C of the angular vibration of the video camera 1 to the position where the ground acceleration sensors 61 and 62 are attached is proportional to the distance. Therefore, the following expressions (11) and (12) are satisfied, similarly to the expression (8).

Y ₁ ′: y ₂ ′ = L ₁ + m / 2: L ₁ −m / 2 (11) y ₁ ″: y ₂ ″ = L ₁ + m / 2: L ₁ −m / 2 (12 )

As a result, the following expressions (13) and (14) are established as in the case of expression (10).

R = L ₂ + (m / 2) ｛{(y ₁ ′ + y ₂ ′) / (y ₁ ′ −y ₂ ′)} (13) r = L ₂ + (m / 2) ｛ _{(y 1 "+ y 2"} ) / (y 1 "-y 2")} ... (14)

In this embodiment, the ground acceleration sensor 6
Since the ground accelerations y ₁ ″ and y ₂ ″ can be obtained from ₁ , 62, the distance from the center position C of the angular vibration of the video camera 1 to the center position R of the optical axis angle varying device 11 is obtained by using Expression (14). r can be obtained.

The CPU 15 in FIG. 8 calculates the angular displacement α in the equation (7) based on the output signal of the angular velocity sensor 13 and calculates the distance in the equation (7) based on the output signals of the ground acceleration sensors 61 and 62. The optical axis correction angle γ is calculated by substituting these into Equation (7). After obtaining the optical axis correction angle γ by equation (7), the CPU 15 obtains k · γ by referring to the value of the parameter k stored in the nonvolatile memory 16, and the output of the lens position sensor 12 is k · γ. The optical axis angle varying device 11 is controlled so as to be γ.

As described above, according to the image shake correcting apparatus 60 of the present embodiment, the CPU 15 controls the center position C of the angular vibration of the video camera 1 based on the output signals of the ground acceleration sensors 61 and 62. To determine the distance r from the optical axis angle variable device 11 to the center position R, and controls the optical axis angle variable device 11 based on the angular displacement α and the distance r determined based on the output signal of the angular velocity sensor 13. Since the image blur is corrected, there is a case where precise image blur correction is not performed due to a mismatch between the center of the angular vibration generated in the video camera 1 and the position of the optical axis angle varying device 11. More specifically, even if the image shake correction device is optimally adjusted so that a subject at a specific distance is stationary, if the state of occurrence of vibration changes, sufficient image shake correction for the specific subject is performed. It is possible to prevent not be able to exert a force.

In this embodiment, instead of the ground acceleration sensors 61 and 62, a ground position sensor that detects a ground position that is a position with respect to the ground and a ground speed sensor that detects a ground speed that is a speed with respect to the ground are provided. May be used. When the ground position sensor is used, a position movement amount per unit time is obtained based on an output signal of the ground position sensor, and the position movement amount is substituted into Expression (10) to obtain the center of the angular vibration of the video camera 1. Optical axis angle variable device 11 from position C
The distance r to the center position R can be obtained. When the ground speed sensor is used, a speed obtained from an output signal of the ground speed sensor is obtained, and this speed is substituted into Expression (13), and the optical axis angle varying device 11 is obtained from the center position C of the angular vibration of the video camera 1. The distance r to the center position R can be obtained. As described above, as the measuring means in the angular vibration center position information detecting means, any of a ground acceleration sensor, a ground position sensor, and a ground speed sensor may be used, but the price,
From the standpoint of performance and the like, a ground acceleration sensor is the most common and the most practical. Other configurations and operations in the present embodiment are the same as those in the first embodiment.

FIG. 10 is a block diagram showing a configuration of an image blur correction device according to a fifth embodiment of the present invention. The image shake correction apparatus 70 according to the present embodiment is configured by adding ground acceleration sensors 61 and 62 similar to those of the fourth embodiment to the image shake correction apparatus 10 according to the first embodiment. Is the angular velocity sensor 13 and the distance measuring sensor 1
7. The optical axis angle varying device 11 is controlled based on the output signals of the ground acceleration sensors 61 and 62.

In the present embodiment, the CPU 15 determines the angular displacement α in the equation (7) based on the output signal of the angular velocity sensor 13, and calculates the distance in the equation (7) based on the output signal of the distance measuring sensor 17. d, and the ground acceleration sensor 6
The distance r in the equation (7) is obtained based on the output signals of 1, 62, and these are substituted into the equation (7) to calculate the optical axis correction angle γ. The CPU 15 calculates the optical axis correction angle γ according to the equation (7).
Is obtained, k · γ is obtained by referring to the value of the parameter k stored in the nonvolatile memory 16, and the optical axis angle varying device 1 is set so that the output of the lens position sensor 12 becomes k · γ.
Control 1

As described above, according to the image shake correcting apparatus 70 according to the present embodiment, the distance from the video camera 1 to the subject 20 is measured by the distance measuring sensor 17, and
On the basis of the output signals of the ground acceleration sensors 61 and 62, the optical axis angle varying device 1 is determined from the center position of the angular vibration of the video camera 1.
1 to determine the distance to the center position, and based on the information of these distances and the angular displacement determined based on the output signal of the angular velocity sensor 13, controls the optical axis angle variable device 11
Since the image shake is corrected, there may be a case where precise image shake correction is not performed due to a mismatch between the center of the angular vibration generated in the video camera 1 and the position of the optical axis angle variable device 11, More specifically, as in the first embodiment, a phenomenon in which a distant subject shakes when the near subject is adjusted to be stationary, and a phenomenon in which the near subject is shaken when the distant subject is adjusted to be still, similarly to the first embodiment. As in the fourth embodiment, even if the image shake correction device is optimally adjusted so that the subject at a specific distance is stationary, when the state of occurrence of vibration changes, It is possible to prevent a case where a sufficient image blur correction ability for a specific subject cannot be exhibited.

The other configurations and operations in this embodiment are the same as those in the first embodiment or the fourth embodiment.

FIG. 11 is a block diagram showing a configuration of an image blur correction device according to a sixth embodiment of the present invention. The image shake correction device 80 according to the present embodiment is configured by adding ground acceleration sensors 61 and 62 similar to those in the fourth embodiment to the image shake correction device 30 according to the second embodiment, and Is the output signal of the angular velocity sensor 13 and the focus distance information 3 from the focus distance information generation unit 32.
The optical axis angle varying device 11 is controlled based on output signals of the ground acceleration sensor 3 and the ground acceleration sensors 61 and 62.

In the present embodiment, instead of obtaining the distance d in the equation (7) based on the output signal of the distance measuring sensor 17 in the fifth embodiment, the equation (7) based on the focus distance information 33 is used. Find the middle distance d.

The other configurations and operations in the present embodiment are the same as those in the second or fourth embodiment. The effects of the present embodiment are the same as those of the fifth embodiment.

FIG. 12 is a block diagram showing the configuration of an image blur correction device according to the seventh embodiment of the present invention. The image shake correcting device 90 according to the present embodiment is configured by adding ground acceleration sensors 61 and 62 similar to those in the fourth embodiment to the image shake correcting device 40 according to the third embodiment, and Is the output signal of the angular velocity sensor 13 and the focus distance information 43 from the auto focus processing unit 42.
In addition, the optical axis angle varying device 11 is controlled based on the output signals of the ground acceleration sensors 61 and 62.

In the present embodiment, instead of obtaining the distance d in the equation (7) based on the output signal of the distance measuring sensor 17 in the fifth embodiment, the equation (7) based on the focus distance information 43 is used. Find the middle distance d.

The other configurations and operations in this embodiment are the same as those in the third embodiment or the fourth embodiment. The effects of the present embodiment are the same as those of the fifth embodiment.

The present invention is not limited to the above embodiments. For example, the image blur correcting device of the present invention is not limited to the adapter type as described in the embodiment, but may be integrated with a video camera or the like. It may be one that is built into the camera or one that is integrated with the camera lens. Further, the present invention is not limited to a video camera, and can be applied to other types of imaging devices such as a still camera and a camera using a movie film.

[0107]

As described above, according to the image shake correction apparatus of any one of claims 1 to 4, the shake detection means detects the shake of the image pickup apparatus, and the distance information acquisition means detects the shake of the object from the image pickup apparatus. The information about the distance to the optical axis angle variable device is controlled by the image shake correction control means based on the detection output of the shake detection means and the information on the distance acquired by the distance information acquisition means. Is corrected, the precise image shake correction may not be performed due to the mismatch between the center of the angular vibration generated in the imaging device and the position of the optical axis angle variable device. Prevent the phenomenon that a distant subject shakes when the subject is adjusted to stand still, and conversely, a nearby subject shakes when the distant subject is adjusted to stand still. An effect that can be.

According to the third aspect of the present invention, the distance information obtaining means obtains the information on the distance generated by the distance information generating means provided in the imaging device. This eliminates the need for a means for measuring the distance from the imaging device to the subject, and has the effect of simplifying the configuration.

According to the image blur correcting apparatus of the fourth aspect, the distance information acquiring means acquires the distance information from the automatic focusing means provided in the image pickup apparatus. There is no need for a means for measuring the distance from the object to the subject, and the configuration is simplified.

According to the image shake correcting apparatus of the fifth or sixth aspect, the shake of the image pickup device is detected by the shake detecting means, and the center position of the angular vibration generated in the image pickup device by the angular vibration center position information detecting means. The image shake correction control means controls the optical axis angle variable device based on the detection output of the shake detection means and the information detected by the angular vibration center position information detection means, thereby controlling the image shake. Is corrected, so that accurate image blur correction may not be performed due to a mismatch between the center of the angular vibration generated in the imaging device and the position of the optical axis angle variable device. Even if the image stabilization device is optimally adjusted so that the subject at a certain distance is stationary, if the occurrence of vibration changes, sufficient image shake correction An effect that it is possible to prevent the can not exert.

According to the image shake correcting apparatus of any one of claims 7 to 11, the shake of the imaging device is detected by the shake detecting means, and the information on the distance from the imaging device to the subject is obtained by the distance information obtaining means. Then, the information corresponding to the center position of the angular vibration generated in the imaging device is detected by the angular vibration center position information detecting means, and the detection output of the vibration detecting means and the distance information obtaining means are obtained by the image shake correction control means. Based on the information of the distance and the information corresponding to the center position of the angular vibration detected by the angular vibration center position information detecting means, the optical axis angle variable device is controlled to correct the image shake, The fact that precise image shake correction may not be performed due to the inconsistency between the center of the angular vibration generated in the imaging device and the position of the optical axis angle variable device. It is possible to prevent the phenomenon that a distant subject shakes when the near subject is adjusted to stand still, and to prevent the near subject from shaking when the distant subject is adjusted to stand still. Even if the image shake correction device is optimally adjusted so that the subject at a certain position is stationary, it is possible to prevent a situation in which sufficient image shake correction capability cannot be exhibited for the specific subject when the occurrence state of vibration changes. It has the effect of being able to do so.

Further, according to the image blur correcting apparatus of the ninth aspect, the distance information obtaining means obtains the information of the distance generated by the distance information generating means provided in the imaging device. This eliminates the need for a means for measuring the distance from the imaging device to the subject, and has the effect of simplifying the configuration.

Further, according to the image blur correcting apparatus of the tenth aspect, the distance information obtaining means obtains the distance information from the automatic focusing means provided in the image pickup apparatus. There is no need for a means for measuring the distance from the object to the subject, and the configuration is simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image shake correction apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view showing the appearance of the video camera equipped with the image blur correction device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating an example of a configuration of a distance measuring sensor in FIG. 1;

FIG. 4 is an explanatory diagram for describing control of image shake correction according to the first embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of an image shake correction apparatus according to a second embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of an image shake correction apparatus according to a third embodiment of the present invention.

FIG. 7 is a block diagram illustrating an example of a configuration of a focus lens driving unit and an autofocus processing unit in FIG. 6;

FIG. 8 is a block diagram illustrating a configuration of an image shake correction apparatus according to a fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram for describing a method for detecting a distance from a center position of angular vibration to an optical axis angle varying device according to a fourth embodiment of the present invention.

FIG. 10 is a block diagram illustrating a configuration of an image blur correction device according to a fifth embodiment of the present invention.

FIG. 11 is a block diagram illustrating a configuration of an image shake correction apparatus according to a sixth embodiment of the present invention.

FIG. 12 is a block diagram illustrating a configuration of an image shake correction apparatus according to a seventh embodiment of the present invention.

FIG. 13 is an explanatory diagram for describing a problem caused by the center of the angular vibration generated in the camera and the position of the optical axis angle variable mechanism not matching.

FIG. 14 is an explanatory diagram for explaining another problem caused by the center of the angular vibration generated in the camera and the position of the optical axis angle variable mechanism not matching.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Video camera, 10 ... Image blur correction apparatus, 11 ... Optical axis angle variable apparatus, 12 ... Lens position sensor, 13 ... Angular velocity sensor, 14 ... Optical axis angle variable apparatus driving apparatus, 15 ... CP
U, 16: nonvolatile memory, 17: distance measuring sensor

Claims (11)

[Claims] 1. An optical device which is interposed in an optical path for image formation in an imaging device and which can change an angle formed by an optical axis on an output side with respect to an optical axis on an incident side by driving an optical element. An axis angle variable device, a shake detection unit that detects a shake of the imaging device, a distance information acquisition unit that acquires information on a distance from the imaging device to the subject, a detection output of the shake detection unit, and the distance information acquisition unit. An image shake correction apparatus comprising: an image shake correction control unit that controls the optical axis angle variable device based on the acquired distance information to correct image shake. 2. The apparatus according to claim 1, wherein said distance information acquiring means has a distance measuring means for measuring a distance from the imaging device to the subject, and acquires distance information obtained by the distance measuring means. The image blur correction device according to the above description. 3. The imaging apparatus generates focus information for adjusting a distance to a subject that can be imaged in a focused state, and generates information on a distance from the imaging apparatus to the subject based on a state of the focus adjustment means. 2. A distance information generating unit, wherein the distance information obtaining unit obtains information on the distance generated by the distance information generating unit.
The image blur correction device according to the above description. 4. The image pickup apparatus has an automatic focus adjustment unit that automatically adjusts a focus so that a subject is imaged in a focused state and outputs information on a distance from the image pickup apparatus to the subject. 2. The image blur correction device according to claim 1, wherein the distance information obtaining unit obtains information on a distance from an imaging device to a subject from the automatic focus adjustment unit. 5. Light that is interposed in an optical path for image formation in an imaging device and that can change an angle formed by an optical axis on an output side with respect to an optical axis on an incident side by driving an optical element. A variable shaft angle device, a shake detecting means for detecting a shake of the imaging device, an angular vibration center position information detecting means for detecting information corresponding to a center position of the angular vibration occurring in the imaging device, and the shake detecting means Image shake correction control means for controlling the optical axis angle varying device to correct image shake based on the detection output of the information and the information detected by the angular vibration center position information detection means. Image blur correction device. 6. The angular vibration center position information detecting means is provided at at least two places in an imaging device, a member attached to the imaging device, or a main body of the image blur correction device, and detects a parameter value according to a displacement at each position. It has a measuring means for measuring and a distance calculating means for calculating a distance from the center position of the angular vibration to the optical axis angle variable device as information corresponding to the center position of the angular vibration based on the measurement value of the measuring means. 6. The image blur correction device according to claim 5, wherein: 7. Light that is interposed in an optical path for image formation in an imaging device and that can change an angle formed by an optical axis on an output side with respect to an optical axis on an incident side by driving an optical element. An axis angle variable device, a shake detecting unit for detecting a shake of the imaging device, a distance information obtaining unit for obtaining information on a distance from the imaging device to the subject, and a center position of angular vibration generated in the imaging device. Angular vibration center position information detecting means for detecting the detected information, and the detection output of the shake detecting means, the information of the distance obtained by the distance information obtaining means, and the information detected by the angular vibration center position information detecting means. An image blur correction control means for controlling the optical axis angle varying device to correct the image blur based on the image blur correction device. 8. The apparatus according to claim 7, wherein said distance information acquiring means has a distance measuring means for measuring a distance from the imaging device to the subject, and acquires distance information obtained by said distance measuring means. The image blur correction device according to the above description. 9. The image pickup apparatus generates focus information for adjusting a distance to an object that can be imaged in a focused state, and generates information on a distance from the image pickup apparatus to the object based on a state of the focus adjuster. 8. A distance information generating unit, wherein the distance information obtaining unit obtains information on the distance generated by the distance information generating unit.
The image blur correction device according to the above description. 10. The image pickup apparatus has automatic focus adjustment means for automatically performing focus adjustment so that a subject is imaged in a focused state, and outputting information on the distance from the image pickup apparatus to the subject. 8. The image blur correction device according to claim 7, wherein the distance information obtaining unit obtains information on a distance from an imaging device to a subject from the automatic focus adjustment unit. 11. The angular vibration center position information detecting means,
A measuring unit that is provided at at least two places in the imaging device, a member attached to the imaging device, or a main body of the image blur correction device, and that measures a value of a parameter corresponding to a displacement at each position; 8. The image shake correction apparatus according to claim 7, further comprising a distance calculation unit configured to calculate a distance from the center position of the angular vibration to the optical axis angle varying device as information corresponding to the center position of the angular vibration.