JP6103339B2 - Image acquisition method and imaging apparatus - Google Patents

Description

  The present invention relates to an image acquisition method and an imaging apparatus.

  In an electronic image pickup device such as a digital still camera or a video camera, an optical low-pass filter using birefringence is arranged in front of an image pickup device made of a CCD or the like to separate a light beam into two or four points, thereby picking up an image. It is configured to reduce noise such as moire fringes and false colors due to the elements (see, for example, Patent Document 1). However, while such an optical low-pass filter reduces noise, the resolution of high-frequency components also deteriorates. In addition, since the light is divided into two or four points, the amount of light is reduced to 1/2 or 1/4.

JP 2004-301891 A

  As described above, since the optical low-pass filter is generally built in the camera body, there is a problem that noise reduction and resolution reduction cannot be controlled in accordance with the optical performance of the lens.

  The present invention has been made in view of such problems, and controls noise reduction and resolution reduction by controlling a movable lens group that changes the position of the optical axis of the imaging lens on the imaging surface of the imaging device. It is an object of the present invention to provide an image acquisition method and an imaging apparatus that can perform the above processing.

In order to solve the above-described problem, an image acquisition method according to the present invention includes a lens group constituting a photographing lens or at least a part of the lens as a movable lens group, and a direction in which the movable lens group is orthogonal to the optical axis by a control unit. An image acquisition method by an imaging apparatus configured to move so as to have the following components: a first step of acquiring a first image by an imaging element; analyzing the first image; A second step of determining the shift direction and shift amount of the optical axis of the photographic lens based on this, moving the movable lens group based on the shift direction and shift amount, and shifting the optical axis of the photographic lens on the imaging surface of the image sensor by the third step of the position of the optical axis of the taking lens on the imaging plane to obtain at least one different images, as well as the light of the first image and the photographing lens Fourth step position of generating one image by combining the different images, characterized by having a.

In addition, an imaging apparatus according to the present invention includes an imaging lens having a lens group or a movable lens group that moves at least a part of the lens so as to have a component in a direction perpendicular to the optical axis, and imaging on the image plane of the imaging lens. An image pickup device having a surface disposed thereon, and a control unit that controls the operation of the movable lens group and acquires a signal output from the image pickup device to generate an image . 1 image is acquired, the first image is analyzed, the shift direction and the shift amount of the optical axis of the photographing lens are determined based on the analysis result, and the movable lens group is moved based on the shift direction and the shift amount. Te by shifting the optical axis of the taking lens on the imaging surface of the imaging device, a different image position of the optical axis of the taking lens of the image pickup plane to acquire at least one, light of the first image and the photographing lens Wherein the position of generating one image by combining different images.

  When the present invention is configured as described above, an image acquisition method capable of controlling noise reduction and resolution reduction by controlling the movable lens group that changes the position of the optical axis of the imaging lens on the imaging surface of the imaging device. In addition, an imaging device can be provided.

It is explanatory drawing which shows the structure of an imaging device. It is a flowchart which shows the process of noise removal control. It is explanatory drawing which shows the moving direction of the anti-vibration lens group in noise removal control, Comprising: (a) The case where 2 points | pieces were separated in the up-down direction, (b) shows the case where 2 points | pieces were separated in the left-right direction, (c ) Shows a case where four points are separated vertically and horizontally. It is a flowchart which shows the process of the modification of noise removal control. It is explanatory drawing which shows the operation | movement in zooming of the imaging lens which concerns on an Example, (a) shows a wide-angle end state, (b) shows a telephoto end state. It is a lens block diagram of the photographic lens which concerns on the said Example. It is a spot diagram of the photographic lens concerning the above-mentioned example, and (a) shows a wide-angle end state and (b) shows a telephoto end state.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an imaging apparatus 100 such as a digital still camera or a video camera captures an image of a subject imaged on an image plane I by a lens unit 110 including a photographing lens SL and the photographing lens SL. An image sensor 10 composed of a CCD or the like to be output as a signal, a control unit 20 composed of a CPU, a RAM, or the like that generates (photographs) a digital image by processing a signal acquired by the image sensor 10. A camera body 120 equipped with a storage unit 30 for storing a program to be executed and a generated digital image, a rear liquid crystal display 40 for displaying the photographed digital image, a release button 50 for the photographer to instruct photographing timing, and the like, It is composed of The lens unit 110 may be configured integrally with the camera body 120 or may be an interchangeable lens that can be attached to and detached from the camera body 120.

  Further, the photographic lens SL mounted on the imaging device 100 changes the photographic magnification (focal length) by moving at least a part of the lens group and the lenses constituting the photographic lens SL in the optical axis direction. It has a mechanism for zooming and a mechanism for focusing on the subject by changing the shooting distance, and the control of the lens group or lens operation during zooming or focusing is performed by the control unit 20.

  Further, the photographing lens SL is a movable lens group that moves at least a part of the lens group or the lens so as to have a component in a direction orthogonal to the optical axis, thereby causing vibrations (such as camera shake) of the imaging device 100. It is configured to prevent image blur. Hereinafter, this movable lens group is referred to as an anti-vibration lens group VL. Specifically, the vibration (direction and size) of the imaging apparatus 100 is detected by a sensor (for example, an acceleration sensor) 60 mounted on the lens unit 110 or the camera body 120, and image blur due to the vibration is detected by the control unit 20. The anti-vibration lens group VL is configured to move in the direction to cancel.

  Here, since the light receiving pixels are regularly arranged on the light receiving surface of the image sensor 10, noise such as moire fringes or false colors is generated by the arrangement pattern of the light receiving pixels and the pattern of the subject image. There is. As described above, the optical low-pass filter having the birefringent plate has a function of separating the light incident on the birefringent plate into an ordinary ray and an extraordinary ray (linear ray). By utilizing the characteristics of this birefringent plate, the light beam forming the image of the subject is separated into two or four points by an optical low-pass filter, thereby blurring a pattern with a fineness of a certain degree or more. It is comprised so that the said noise which generate | occur | produces may be reduced. That is, by providing an optical low-pass filter between the photographic lens and the image sensor, a spatial frequency component having the wavelength of the pixel pitch of the image sensor as a wavelength is cut from the subject light, and noise is reduced. However, when such an optical low-pass filter is used, the noise is reduced, but the resolution of the high-frequency component is also deteriorated.

  By the way, when the photographic lens has a zooming mechanism or a focusing mechanism as described above, the aberration of the lens group or the lens also varies due to movement of at least a part of the lens group or the lens. For example, when the amount of aberration generated by the photographic lens is small, the resolution of the subject image formed on the image plane also increases and the above-mentioned noise is likely to occur. However, it is necessary to suppress the generation of noise using the optical low-pass filter as described above. On the other hand, when the amount of aberration is large, the resolving power is low and noise is less likely to occur, so it is not necessary to remove high-frequency components using an optical low-pass filter. is there.

  In the imaging apparatus 100 according to the present embodiment, instead of providing an optical low-pass filter, the operation of the anti-vibration lens group VL is controlled to shift the position of the optical axis of the imaging lens SL on the imaging surface of the imaging element 10. At least two images are acquired, and the noise removal control for suppressing the above-described noise generation is performed by superimposing these images.

  Now, an image acquisition method using noise removal control executed by the control unit 20 of the imaging apparatus 100 according to the present embodiment will be described with reference to FIG. When the control unit 20 monitors the operation of the release button 50 and determines that the release button 50 is turned on (step S200), the control unit 20 acquires information for controlling the operation of the image stabilizing lens group VL (step S210). . This information includes the number of times an image is acquired by shifting the optical axis of the photographic lens SL on the imaging surface of the image sensor 10, the direction to shift, and the amount to shift. Here, the number of image acquisitions corresponds to the number of separations by the above-described optical low-pass filter (two-point separation or four-point separation), and the shift direction and amount correspond to the separation direction and separation width. These are called the number of separations, the separation direction, and the separation width. This information may be selected by the photographer in advance and stored in the storage unit 30 and read from the storage unit 30 at the time of shooting, or the focal length and the shooting distance may be determined according to the characteristics of the shooting lens SL. Correspondingly, the number of separations, the separation direction, and the width are stored in the storage unit 30, and an appropriate value is read from the storage unit 30 according to the focal length (imaging magnification) and the shooting distance of the shooting lens SL at the time of shooting. You may comprise.

  The control unit 20 captures one image from the image sensor 10 in the current state of the anti-vibration lens group VL, and temporarily stores it in a RAM or the like (step S220). Next, according to the information acquired in step S210, the image stabilizing lens group VL is moved so that the position of the optical axis of the photographic lens SL on the imaging surface becomes the above-described separation direction and separation width (step S230), and the state Thus, one image is captured from the image sensor 10 and temporarily stored in a RAM or the like (step S240). Further, it is determined whether or not images for the number of separations have been acquired (step S250), and steps S230 and S240 are repeated until images for the number of separations are acquired. When the control unit 20 determines in step S250 that the number of separation images has been acquired, the control unit 20 reads and superimposes a plurality of temporarily stored images to generate a single digital image. The digital image thus output is output to the storage unit 30 and the rear liquid crystal display 40 (step S260), and one shooting control is completed.

  In this way, the position of the optical axis of the photographic lens SL on the imaging surface is shifted by moving the anti-vibration lens group VL so that the movement of the optical axis on the imaging surface becomes a predetermined separation direction and separation width. By acquiring multiple images of the subject and overlaying them (as a result, the same effect as multiple exposure shooting can be obtained), the spatial frequency component corresponding to the separation width is removed for each separation direction. Therefore, it is possible to prevent the generation of noise such as moire fringes and false colors. At this time, if images are continuously acquired by the image sensor 10 while moving the anti-vibration lens group VL, high-frequency components equal to or higher than the spatial frequency corresponding to the separation width are removed, so high-frequency components other than noise are also removed. End up. Therefore, as described above, it is necessary to acquire and superimpose a plurality of images in a state where the image stabilizing lens group VL is moved so that the position of the optical axis on the imaging surface is moved by the separation width. . According to such an imaging apparatus 100, since the number of separations, directions, and widths at the time of image capturing can be set freely, the balance between prevention of noise and maintenance of resolving power according to the optical performance of the imaging lens SL is achieved. Can be kept optimal. In particular, the image acquisition method according to the present embodiment is effective when the photographing lens is an interchangeable lens or has a zooming or focusing mechanism (when the optical performance changes). Further, since a plurality of images are superimposed, a sufficient amount of light can be obtained.

  When camera shake is prevented by the VR lens group VL (when image stabilization control is performed), the movement vector of the optical axis on the image plane by the VR lens group VL according to the detection result of the sensor 60 described above ( Control may be performed by adding a movement vector (separation direction and width) for noise removal to the movement direction and amount).

  Further, noise such as moire fringes and false colors is related to the pitch of the image sensor 10 as described above, and it is desirable to move the VR lens group VL so as to satisfy the relationship of the following expression (1). .

0.5 × P ≦ S ≦ 2 × P (1)
P: Pixel pitch of the image sensor 10 S: Shift amount of the optical axis of the photographic lens SL on the imaging surface of the image sensor 10 due to movement of the VR lens group VL

  Similarly, when camera shake prevention is performed with the image stabilization lens group VL (when image stabilization control is performed), it is desirable to move the VR lens group VL so as to satisfy the relationship of the following expression (2).

0.5 × P + H ≦ S ≦ 2 × P + H (2)
P: Pixel pitch of the image sensor 10 S: Amount of shift of the optical axis of the photographic lens SL on the image surface of the image sensor 10 due to movement of the VR lens group VL H: Image surface due to movement of the VR lens group VL in the camera shake correction function Shift amount of the optical axis of the taking lens SL,

  Further, the shift amount S described above can be determined according to the aberration amount of the photographic lens SL. For example, it is desirable to move the VR lens group VL so that the shift amount S satisfies the relationship of the following expression (3) in relation to the spherical aberration.

S = 83 × P / a (3)
P: Pixel pitch of the image sensor 10 S: Shift amount of the optical axis of the photographic lens SL on the imaging surface of the image sensor 10 due to movement of the VR lens group VL a: A spot image of a point light source arranged on the optical axis Spot diameter due to spherical aberration

  Note that the movement control (noise removal control) of the VR lens group VL for removing the noise described above is performed in a vertical direction within a plane orthogonal to the optical axis, as shown in FIG. 2 point separation to move to, 2 point separation to move in the horizontal direction as shown in FIG. 3B, and 4 point separation to move in the vertical and horizontal directions as shown in FIG. 3C. However, the number of separation and the separation direction of the VR lens group VL by the imaging device 100 according to the present invention are not limited to these (for example, it is moved by being inclined by 45 ° with respect to the horizontal direction). May be).

(Modification)
The above-described noise such as moiré fringe and false color is generated when a predetermined high-frequency component is included in the subject image in relation to the pixel pitch of the light receiving pixels of the image sensor 10. Therefore, in the processing of the control unit 20 described above, whether or not the second and subsequent images are necessary by analyzing whether or not a predetermined high-frequency component is included in the first acquired image is necessary. In this case, it is possible to determine which direction and which shift should be performed. Specifically, as shown in FIG. 4, when the control unit 20 determines that the release button 50 is turned on (step S300), one image from the image sensor 10 in the current state of the anti-vibration lens group VL. Is temporarily stored in a RAM or the like (step S310). And the control part 20 analyzes the spatial frequency component contained in this image, and judges whether noise removal control is required (step S320). At this time, when determining that noise removal control is necessary, the control unit 20 determines the number of separations, the separation direction, and the separation width from the direction and amount in which the spatial frequency components are arranged.

  When the control unit 20 determines in step S320 that noise removal control is necessary (step S340), the control unit 20 moves the anti-vibration lens group VL so that the separation direction and separation width determined by the analysis are obtained (step S350). In this state, one image is captured from the image sensor 10 and temporarily stored in a RAM or the like (step S360). Further, it is determined whether or not images for the number of separations have been acquired (step S370), and steps S350 and S360 are repeated until images for the number of separations are acquired. Then, when determining that the number of separation images has been acquired in step S370, the control unit 20 reads and superimposes a plurality of temporarily stored images to generate a single digital image (step S380). ), The generated digital image is output to the storage unit 30 and the rear liquid crystal display 40 (step S390), and one shooting control is terminated. On the other hand, when the control unit 20 determines in step S350 that the noise removal control is unnecessary, the control unit 20 outputs the image captured in step S310 to the storage unit 30 or the rear liquid crystal display 40 (step S390). Shooting control ends.

  When the imaging apparatus 100 according to the present embodiment is configured as described above, whether or not to perform noise removal control is determined according to the subject image, and also when noise removal control is performed, according to the subject image. Since the number of separations, the separation direction, and the separation width are determined, it is possible to optimally maintain the balance between the prevention of noise generation and the resolution according to the subject.

  Hereinafter, an embodiment when the above-described noise removal control is performed on the photographing lens SL which is a zoom lens will be described with reference to the drawings.

In the following embodiments, the aspherical surface has a height in the direction perpendicular to the optical axis as y, and the distance along the optical axis from the tangent plane of the apex of each aspherical surface to each aspherical surface at height y ( When the sag amount is S (y), the radius of curvature of the reference sphere (paraxial radius of curvature) is r, the conic constant is K, and the nth-order aspheric coefficient is An, the following equation (a) expressed. In the following examples, “E−n” indicates “× 10 ⁻ⁿ ”.

S (y) = (y ² / r) / [1+ {1−K (y ² / r ² )} ^1/2 ]
+ A4 × y ⁴ + A6 × y ⁶ + A8 × y ⁸ + A10 × y ¹⁰ (a)

  In each embodiment, the secondary aspheric coefficient A2 is zero. In the table of each example, an aspherical surface is marked with * on the right side of the surface number.

  5 and 6 are diagrams illustrating the configuration of the photographic lens SL according to the present embodiment. The photographing lens SL includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, And a fourth lens group G4 having a positive refractive power. The first lens group G1 includes, in order from the object side, a cemented lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are cemented, and a positive meniscus lens L13 having a convex surface facing the object side. ing. The second lens group G2 is a composite aspherical lens in which resin is formed in an aspheric shape on the object side surface of the glass lens in order from the object side, and a negative meniscus lens shape with a convex surface facing the object side. The aspherical negative lens L21, the biconcave lens L22, the biconvex lens L23, and the negative meniscus lens L24 having a concave surface facing the object side. Further, in the third lens group G3, in order from the object side, a biconvex lens L31, a cemented lens in which the biconvex lens L32 and the biconcave lens L33 are cemented, and a resin are formed in an aspheric shape on the object side surface of the glass lens. The composite aspherical lens is composed of a cemented lens in which a biconcave aspherical negative lens L34 and a positive meniscus lens L35 having a convex surface facing the object side are cemented. The fourth lens group G4 includes a biconvex lens-shaped aspherical positive lens L41 having an aspheric surface on the object side, a cemented lens in which the biconvex lens L42 and the biconcave lens L43 are cemented, and an object side. It is composed of a positive meniscus lens L44 having a concave surface.

  In the photographing lens SL according to this embodiment, an aperture stop S is disposed between the second lens group G2 and the third lens group G3. Further, as shown in FIG. 5, in the photographic lens SL, when zooming from the wide-angle end state to the telephoto end state, the first lens group G1 to the fourth lens group G4 move to the object side along the optical axis. To do. At this time, the aperture stop S moves together with the third lens group G3. Further, a cemented lens of the biconcave lens L34 of the third lens group G3 and the positive meniscus lens L35 is used as the anti-vibration lens group VL.

  Table 1 below lists values of specifications of the photographing lens SL according to the present example. In the overall specifications of Table 1, f represents the focal length, FNO represents the F number, and the values of the wide-angle end state and the telephoto end state are shown for each. In the lens data, the first column m indicates the order (surface number) of the optical surfaces from the object side along the traveling direction of the light beam, the second column r indicates the curvature radius of each optical surface, The column d shows the distance (surface interval) on the optical axis from each optical surface to the next optical surface, and the fourth column νd and the fifth column nd show the Ab for the d-line (wavelength λ = 587.6 nm), respectively. Number and refractive index are shown. The surface numbers 1 to 31 shown in Table 1 correspond to the numbers 1 to 31 shown in FIG. A curvature radius of 0.0000 indicates a plane on the lens surface and an aperture on the aperture stop S. Further, the refractive index of air of 1.0000 is omitted. The aspheric data shows the values of the conical constant K and the aspheric constants A4 to A10 in the above-mentioned aspheric expression (a).

  Here, the focal length f, the radius of curvature r, the surface interval d, and other length units listed in all the following specification values are generally “mm”, but the optical system is proportionally enlarged or proportional. Since the same optical performance can be obtained even if the image is reduced, the present invention is not limited to this.

(Table 1)
Overall specifications Wide angle end Telephoto end f = 18.49 194.43
Fno = 3.5 5.9

Lens data m r d νd nd
1 140.000 2.00 32.35 1.85026
2 66.397 8.70 82.52 1.49782
3 -405.830 0.10
4 59.528 6.10 65.47 1.60300
5 264.870 d1
6 * 500.000 0.20 38.09 1.55389
7 300.000 1.20 46.63 1.81600
8 15.035 5.90
9 -52.673 1.20 46.63 1.81600
10 45.944 0.10
11 30.000 4.60 23.78 1.84666
12 -50.436 1.00
13 -28.586 1.00 52.32 1.75500
14 -185.828 d2
15 0.000 0.50
16 34.775 3.00 60.09 1.64000
17 -37.337 0.10
18 29.187 3.60 82.52 1.49782
19 -24.954 1.00 32.35 1.85026
20 197.208 3.00
21 * -43.610 0.05 38.09 1.55389
22 -43.610 1.00 49.61 1.77250
23 25.212 1.80 25.43 1.80518
24 92.180 d3
25 * 80.000 4.00 55.34 1.67790
26 -32.053 1.50
27 80.000 3.60 82.52 1.49782
28 -40.000 1.40 37.17 1.83400
29 46.700 1.80
30 -120.000 2.80 65.47 1.60300
31 -29.313 BF

Aspheric data m K A4 A6 A8 A10
6 1.0000 1.10280E-05 -3.56250E-08 1.02120E-10 -1.60960E-13
21 0.0837 7.62690E-06 0.00000E + 00 0.00000E + 00 0.00000E + 00
25 -22.2603 -1.24410E-05 0.00000E + 00 0.00000E + 00 0.00000E + 00

  Further, as described above, in the photographing lens SL according to the present embodiment, the first lens group G1 and the fourth lens group G4 move along the optical axis at the time of zooming. The distance d1 on the optical axis from the group G2, the distance d2 on the optical axis between the second lens group G2 and the third lens group G3, and the distance d3 on the optical axis between the third lens group G3 and the fourth lens group G4. And the back focus BF changes. Here, the back focus BF is a distance on the optical axis from the most image side lens surface of the photographing lens SL (the most image side lens surface (the 31st surface) of the fourth lens group G4) to the image surface I. is there. Table 2 below shows values of the focal length f, the lens group intervals d1 to d3, and the back focus BF of the photographing lens SL in the wide-angle end state, the intermediate focal length state, and the telephoto end state.

(Table 2)
Wide angle end Intermediate focal length Telephoto end f 18.49 69.50 194.43
d1 2.60 38.20 60.76
d2 29.30 11.00 1.50
d3 10.00 3.60 2.00
BF 38.12 66.25 78.74

  FIG. 7 shows on-axis and off-axis spot diagrams in the wide-angle end state and the telephoto end state when the above-described noise removal control is performed. The off-axis position is 70% of the maximum image height. In this embodiment, as shown in FIG. 7A, in the wide-angle end state, since the spot diameter is large and the optical performance (resolving power) is poor, the occurrence of noise is small, so two points are separated in the vertical direction (2 In addition, the separation width is reduced to prevent the resolution of the high frequency component from being lowered due to the noise removal control. On the other hand, as shown in FIG. 7B, in the telephoto end state, since the spot diameter is small and the optical performance (resolution) is good, the vertical direction is used to prevent the generation of noise such as moire fringes and false colors. In addition, four points are separated in the left-right direction (four images are acquired and combined), and the separation width is increased. Thus, by determining the number of separations, the direction, and the width according to the optical performance depending on the focal length of the photographing lens SL, the balance between noise and resolving power can be kept optimal.

DESCRIPTION OF SYMBOLS 100 Image pick-up device 10 Image pick-up element 20 Control part SL Image taking lens VL Anti-vibration lens group (movable lens group)

Claims (10)

An image by an imaging device configured such that at least a part of a lens group or a lens constituting the photographing lens is a movable lens group, and the movable lens group is moved by the control unit so as to have a component in a direction orthogonal to the optical axis. An acquisition method,
A first step of acquiring a first image by an imaging device;
A second step of analyzing the first image and determining a shift direction and a shift amount of the optical axis of the photographing lens based on the analysis result;
By shifting the optical axis of the photographing lens in the shift direction and the imaging surface of the imaging element by moving the movable lens group on the basis of the shift amount, the position of the optical axis of the photographing lens in the imaging plane A third step of acquiring at least one image with different , and
An image acquisition method comprising: a fourth step of generating one image by combining the first image and an image having different optical axis positions of the photographing lens . The image acquiring method according to claim 1, wherein in the third step, the movement of the movable lens group satisfies a relationship of the following formula.
0.5 × P ≦ S ≦ 2 × P
However,
P: Pixel pitch on the imaging surface of the imaging device S: Shift amount of the optical axis of the photographing lens on the imaging surface 2. The image acquisition method according to claim 1, wherein when image stabilization control is performed by the movable lens group, in the third step, the movement of the movable lens group satisfies the relationship of the following equation.
0.5 × P + H ≦ S ≦ 2 × P + H
However,
P: Pixel pitch on the imaging surface of the imaging device S: Shift amount of the optical axis of the photographing lens on the imaging surface H: Shift amount of the optical axis on the imaging surface by the image stabilization control The image acquisition method according to any one of claims 1 to 3, wherein the shift amount of the optical axis in the third step is determined according to the optical performance of the imaging lens. In the third step, when the amount of aberration generated by the imaging lens is small, the shift amount is increased, and when the amount of aberration generated by the imaging lens is large, the shift amount is decreased. Item 5. The image acquisition method according to Item 4. A photographic lens having a lens group or a movable lens group that moves at least a part of the lens so as to have a component in a direction perpendicular to the optical axis;
An imaging element having an imaging surface disposed on an image plane of the photographing lens;
A control unit for controlling the operation of the movable lens group and acquiring a signal output from the image sensor to generate an image;
The control unit acquires a first image by the imaging element, analyzes the first image, determines a shift direction and a shift amount of the optical axis of the photographing lens based on the analysis result, and the shift The position of the optical axis of the photographic lens on the imaging surface is shifted by moving the movable lens group based on the direction and the shift amount to shift the optical axis of the photographic lens on the imaging surface of the imaging element. An imaging apparatus , wherein at least one different image is acquired, and one image is generated by synthesizing the first image and an image having different optical axis positions of the photographing lens . The imaging apparatus according to claim 6 , wherein the control unit moves the movable lens group so as to satisfy the relationship of the following expression.
0.5 × P ≦ S ≦ 2 × P
However,
P: Pixel pitch on the imaging surface of the imaging device S: Shift amount of the optical axis of the photographing lens on the imaging surface The image acquisition method according to claim 6 , wherein when the vibration control is performed by the movable lens group, the control unit moves the movable lens group so as to satisfy the relationship of the following expression.
0.5 × P + H ≦ S ≦ 2 × P + H
However,
P: Pixel pitch on the imaging surface of the imaging device S: Shift amount of the optical axis of the imaging lens on the imaging surface H: Shift amount of the optical axis of the imaging lens on the imaging surface by the image stabilization control The imaging device according to any one of claims 6 to 8 , wherein the control unit determines the shift amount of the optical axis according to the optical performance of the imaging lens. Wherein the control unit according to claim 9 when the amount of aberration generated by the imaging lens is small by increasing the shift amount, when the amount of aberration generated by the imaging lens is large, characterized in that to reduce the shift amount The imaging device described in 1.

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