JP2022095241A - Camera system - Google Patents

Abstract

To provide a camera system which enables a user to adjust optical performance so as to capture a desired image.SOLUTION: The camera system comprises: an image processing unit 208 which executes image processing on a captured image and creates aberration information of the captured image on the basis of a result of the image processing; an aberration information storage unit 108 for storing the aberration information; at least one first lens unit 101; and at least one first driving unit 111 capable of electrically moving the first lens unit 101. On the basis of the aberration information stored in the aberration information storage unit 108, the camera system moves the first lens unit 101 with the first driving unit 111.SELECTED DRAWING: Figure 3

Description

The present invention relates to a camera system.

For example, in portrait photography, the background may be blurred to emphasize a person. For such shooting, it may be preferable that the peripheral portion of the shot image has a low resolution, and the amount of aberration generated in the camera system may differ depending on the situation at the time of shooting.

Patent Document 1 discloses a technique for adjusting the image quality by adjusting each lens group so as to cancel out the aberration generated under various conditions of the imaging optical system.

Japanese Unexamined Patent Publication No. 2010-237250

In Patent Document 1, each lens group is corrected so as to cancel the generated aberration. However, it has not been possible to set the amount of aberration desired by the user and reflect the optical performance to achieve this amount of aberration in the camera system to capture an image.

An object of the present invention is to provide a camera system whose optical performance can be adjusted so that a user can capture an desired image.

The camera system of the present invention includes at least one image processing means that performs image processing on a captured image and creates aberration information of the captured image from the result of the image processing, and a storage unit that stores the aberration information. The optical system is provided with one optical system and at least one driving unit capable of electrically moving the optical system, and the optical system is moved by the driving unit based on the aberration information stored in the storage unit. It is characterized by letting it.

According to the present invention, it is possible to provide a camera system whose optical performance can be adjusted so that a user can capture an desired image.

It is a block diagram which shows the structure of the camera system which concerns on embodiment. It is a figure which shows the example of a plurality of operation means in an image processing means. It is a flowchart which shows the setting of the aberration information which concerns on embodiment. It is a figure which shows the example of the photograph taken by the camera system which concerns on embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative positions of the components, etc. described in the following embodiments are arbitrary and can be changed according to various conditions. Further, unless otherwise specified, the scope of the present invention is not limited to the embodiments specifically described below.

(Embodiment)
Hereinafter, the configuration of the camera system according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a camera system according to an embodiment.

The camera system according to the present invention includes an interchangeable lens 1 (lens device) and a camera body 2 to which the interchangeable lens 1 is detachably attached. The camera body 2 is an interchangeable lens type image pickup device, and is a single-lens reflex camera or a mirrorless camera. Alternatively, it may be a lens-integrated image pickup device such as a digital camera.

First, the configuration of the interchangeable lens 1 will be described. The interchangeable lens 1 includes a plurality of lens units such as a first lens unit 101 (optical system), a second lens unit 102 (optical system), a third lens unit 103 (optical system), and a variable magnification lens unit (not shown). There is. The interchangeable lens 1 further includes a focus lens (not shown) for adjusting the focal distance of the subject image and a lens barrel for holding the focus lens, and the photographing optical system is composed of a plurality of lens units and a focus lens. Has been done. The first lens unit 101 can be driven in the eccentric direction by the first drive unit 111 (drive unit). The second lens unit 102 can be driven in the direction of the optical axis OA by the second drive unit 112 (drive unit). The third lens unit 103 can be driven in the tilting direction by the third drive unit 113 (drive unit). That is, a plurality of drive units are provided so as to correspond to the plurality of optical systems, and each of the drive units can move each of the optical systems in the eccentric direction, the direction of the optical axis OA, or the tilting direction. The first lens unit 101, the second lens unit 102, and the third lens unit 103 form an aberration adjustment group described later.

The lens CPU 100 controls the entire interchangeable lens 1, and includes an arithmetic circuit (not shown), a communication circuit, an internal memory, a timer circuit, an A / D circuit, and the like. Further, the lens CPU 100 communicates with the camera CPU 200 via the contact unit 105 of the interchangeable lens 1 and the contact unit 205 of the camera body 2. The contact unit 105 and the contact unit 205 also have a power supply contact for supplying power to the interchangeable lens 1 via each other.

The lens CPU 100 generates a control signal for driving the first drive unit 111, the second drive unit 112, and the third drive unit 113, and the control signal is converted into the current and voltage required for driving by the signal processing circuit 104. And supplied.

The lens communication unit 106 included in the lens CPU 100 is a communication means for communicating with the camera body 2. The lens communication unit 106 receives a drive command, camera identification information, status, shooting conditions, and the like from the camera body 2, and transmits various information such as lens identification information, status, focus, aperture, and zoom position to the camera body 2.

The movement amount indicating unit 107 of the lens CPU 100 indicates each movement amount of the first lens unit 101, the second lens unit 102, and the third lens unit 103.

The interchangeable lens 1 includes an aberration information storage unit 108 (storage unit), and the aberration information storage unit 108 will be described later.

Next, the configuration of the aberration adjustment group of the interchangeable lens 1 will be described. The first lens unit 101 can be driven by the first drive unit 111 in an eccentric direction substantially orthogonal to the optical axis OA indicated by the arrow in FIG. As a specific configuration of the first drive unit 111, for example, the same configuration as that for driving the image shake correction device can be mentioned. The lens barrel that holds the optical system is held by rolling the ball with respect to the base component, and the lens barrel is driven by a VCM (voice coil motor). In this way, the lens held by the first lens unit 101 can move in a plane orthogonal to the optical axis OA. By driving the first lens unit 101 in the eccentric direction, coma aberration, one-sided blurring, and bias in the amount of peripheral light occur in the interchangeable lens 1.

The second lens unit 102 can be driven by the second drive unit 112 in the direction of the optical axis OA indicated by the arrow in FIG. The specific configuration of the second drive unit 112 may be, for example, the same as the configuration for driving the focus lens. The lens barrel that holds the optical system is guided in the direction of the optical axis OA by a rod-shaped component or the like, and the lens barrel is connected to an STM (stepping motor) or a straight-ahead ultrasonic motor. By driving the second lens unit 102 in the direction of the optical axis OA, spherical aberration, curvature of field, and the like occur in the interchangeable lens 1.

The third lens unit 103 can be driven by the third drive unit 113 in the tilt direction indicated by the arrow in FIG. As a specific configuration of the third drive unit 113, for example, the same configuration as described in Patent Document 1 can be mentioned. The lens barrel that holds the optical system is held by the laminated PZT (piezo element) with respect to the base component, and is driven by the expansion and contraction of the laminated PZT. By driving the third lens unit 103 in the tilting direction, coma aberration and one-sided blurring occur in the interchangeable lens 1.

Next, the configuration of the camera body 2 will be described. The camera body 2 includes an image pickup unit 217 including an image pickup element such as a CCD or a CMOS sensor for photoelectric conversion of a subject image formed by a shooting optical system. The image pickup device is configured to be able to shoot (store) still images and moving images.

Like the lens CPU 100, the camera CPU 200 mounted on the camera body 2 includes an arithmetic circuit (not shown), a communication circuit, an internal memory, a timer circuit, an A / D circuit, and the like, and controls the entire camera body 2. ..

The camera communication unit 206 included in the camera CPU 200 is a communication means for communicating with the interchangeable lens 1. The camera communication unit 206 communicates with the interchangeable lens 1 by transmitting a drive command and various information from the camera body 2 to the interchangeable lens 1 and receiving the state of the interchangeable lens 1.

The lens control unit 207 included in the camera CPU 200 generates an instruction for causing the interchangeable lens 1 to perform the operation required by the camera body 2. For example, when performing AF (autofocus), the amount of movement to the in-focus position is calculated. This amount of movement is given to the interchangeable lens 1 as a drive command through the camera communication unit 206, and the interchangeable lens 1 performs desired focusing to complete focusing.

The image processing unit 208 included in the camera CPU 200 is an image processing means for performing image processing on a photographed image taken in advance by the user, and specifically, image processing software is provided in the camera CPU 200. The user can display the captured image on the display unit 214 of the camera body 2 and perform various image processing. The image processing unit 208 also functions as a creating means for creating aberration information of a captured image from the result of this image processing.

The power supply SW210 is a power supply switch that can be operated by the user, and can start the camera CPU 200 and supply and stop the power supply to the actuator, the sensor, and the like in the interchangeable lens 1.

The camera body 2 includes an aberration information selection unit 211 (selection means), and the aberration information selection unit 211 will be described later.

The release SW212 is a switch used when shooting a still image, and has a first stroke SW and a second stroke SW (not shown). The signal from the release SW212 is input to the camera CPU 200. The recording SW 213 is a switch used when shooting a moving image.

The display unit 214 is a liquid crystal display or the like for displaying a subject image, a captured image, and various information to be captured during or before shooting.

The camera CPU 200 enters the shooting preparation state in response to the input of the ON signal from the first stroke SW. In the shooting preparation state, focus detection is performed by measuring the subject brightness by the focus detection unit 216 and the photometric unit 219. The camera CPU 200 calculates the aperture value of an aperture unit (not shown), the exposure amount of the image sensor possessed by the image pickup unit 217 (at the time of shutter seconds), and the like based on the photometric result.

Further, the camera CPU 200 determines the drive amount of the focus lens based on the focal length of the photographing optical system by the focus detection unit 216. Information on the driving amount of the focus lens is transmitted to the lens CPU 100. When the ON signal from the second stroke SW is input, the camera CPU 200 transmits an aperture drive command to the lens CPU 100, and sets the aperture unit (not shown) to the calculated aperture value. Further, the camera CPU 200 transmits an exposure start command to the exposure unit 218 to perform a mirror retracting operation (not shown) and a shutter opening operation (not shown), and the image pickup unit 217 including the image pickup element performs photoelectric conversion of the subject image. That is, the exposure operation is performed.

The image pickup signal from the image pickup unit 217 is digitally converted by the signal processing unit in the camera CPU 200, further subjected to various correction processes, and output as an image signal. The image signal (data) is stored in the storage unit 215 in a semiconductor memory such as a flash memory or a storage medium such as a magnetic disk or an optical disk.

The camera body 2 is provided with an I / F 220 that is an interface for connecting to an external device, and can be connected to an external device such as a smartphone, a tablet PC, or a personal computer 3 (PC3) via the I / F 220. be. Application software (image processing means) is installed in the PC3 or the like, and image processing can be performed on a photographed image taken in advance by the user.

Next, image processing in the image processing means will be described. FIG. 2 shows an example of an image processing operation means for each aberration by the user and an image display screen A for displaying a photograph when the image processing is performed. FIG. 2 is an example of a screen displayed on the display unit 214 of the camera body 2, or an example of a screen displayed on a display device (display or the like) by dedicated application software installed in the personal computer 3.

After selecting a photo, the user can operate the cursor C corresponding to each aberration information such as left and right one-sided blur, left and right peripheral illumination bias, image plane curvature, and spherical aberration to the left and right for the selected photo. It is possible to confirm a considerably image-processed photograph in which an arbitrary aberration is generated. In addition, by operating the cursor C corresponding to each aberration information of the upper and lower one-sided blur and the upper and lower peripheral illumination amount deviation up and down, a considerable image-processed photograph in which arbitrary aberration is generated for the selected photograph. Can be confirmed. The image processing determines the processing range and gain according to the type of the cursor C as the operating means and the operation amount of the cursor C, and is applied to the selected photograph. As described above, the image processing means has at least one operation means for performing image processing according to each aberration information, and creates aberration information based on the operation amount of at least one operation means.

Each aberration adjustment amount will be described. The left end of the range of each cursor C in each image processing operation means shown in FIG. 2 is the minimum value MIN (limit amount MIN) of the decrease gain of each aberration adjustment amount, and the right end is the increase gain of each aberration adjustment amount. The maximum value is MAX (limit amount MAX). The initial value of the information of each aberration adjustment amount is a state in which the cursor C is located at the center, but the initial value may be the left end or the right end. The user can arbitrarily move the cursor C corresponding to each aberration information between the minimum value MIN and the maximum value MAX. Further, the operation of each cursor C can be performed only up to the position of the limit amount MIN and the limit amount MAX.

The limit amount MIN and the limit amount MAX are quantities determined by the driveable amount of the first lens unit 101, the second lens unit 102, and the third lens unit 103 and the sensitivity of each group to each aberration. The aberration information storage unit 108 stores information on the types of adjustable aberrations. Further, the aberration information storage unit 108 stores a plurality of limit amount MIN and limit amount MAX corresponding to each aberration. The type of aberration to be displayed on the image display screen A is determined according to the types of the stored limit amount MIN and limit amount MAX. Information on the type and amount of adjustable aberration may be stored in the storage unit 215.

It is conceivable that there is a difference in the type and amount of aberration that can be adjusted in the lens depending on the type of the interchangeable lens 1. The aberration adjustment amount stored in the aberration information storage unit 108 or the storage unit 215 at the time of photography, including such aberration information, is stored in the image file when the photographed image is recorded. When the user similarly sets the aberration on another occasion, the aberration adjustment amount stored in the image file of the first selected photograph is read out, and each cursor C shown in FIG. 2 is based on the adjustment amount of each aberration information. You can set the first position of. By storing the aberration adjustment amount in the image file as described above, the limit amount MIN and the limit amount MAX can be appropriately displayed as shown in FIG.

The user can confirm on the image display screen A a photograph in which the above image processing is performed and an arbitrary aberration is generated. Then, the amount of aberration (generation amount) desired by the user can be determined.

Next, the aberration setting by the user will be described. FIG. 3 is a flowchart showing a flow in which the aberration is set as desired by the user and the optical performance such that the aberration is set is reflected in the optical system. The flow of aberration setting for the interchangeable lens 1 will be described with reference to the flowchart of FIG.

First, at the start stage, the user has started the dedicated application software installed in the personal computer 3, or has started the image processing unit 208, which is a program built in the camera body 2. It is in a state.

In step S10, the user selects a photograph of a shooting situation in which aberration is desired to be generated. When making this selection, it is preferable to select a photo that is closer to the shooting situation you want to use.

In step S20, the user himself operates the image processing means on the application software or the program started at the start stage to create a favorite photo. The specific contents of the image processing are as described above.

In step S30, the target value (aberration information) of the aberration adjustment amount to be passed to the interchangeable lens 1 by the application software or the program is determined according to the operation amount of the cursor C which is the operation means of the image processing in step S20. To.

In step S40, the target value of the aberration adjustment amount determined in step S30 is stored in the camera system. Specifically, it is stored in the aberration information storage unit 108 of the interchangeable lens 1 and the storage unit 215 of the camera body 2. If the application software by the personal computer 3 is used at the start stage, it is necessary to connect the interchangeable lens 1 or the camera body 2 to the personal computer 3 by a communication cable or the like.

In step S50, the first lens unit 101, the second lens unit 102, and the third lens unit 103, which are the aberration adjustment groups of the interchangeable lens 1, are driven so as to be the aberration adjustment amount stored in step S40. The drive amount at this time is based on the sensitivity of the first lens unit 101, the second lens unit 102, and the third lens unit 103 to each aberration according to the target value of the aberration adjustment amount stored in step S40. It is calculated by the lens CPU 100. Then, a signal instructing the drive amount is transmitted from the movement amount instruction unit 107 to the signal processing circuit 104. As a result, the interchangeable lens 1 is in a state in which the amount of aberration desired by the user is generated. In this way, the operation amount of the cursor C for image processing is determined as the target value of the aberration adjustment amount of the interchangeable lens 1.

Next, the selection of each aberration information will be described. A plurality of target values of the aberration adjustment amount stored in step S40 of the flowchart shown in FIG. 3 can be stored in the aberration information storage unit 108 or the storage unit 215. The target value of the plurality of held aberration adjustment amounts can be selected by the aberration information selection unit 211 included in the camera body 2.

By allowing the user to select one from the target values of the plurality of stored aberration adjustment amounts by the aberration information selection unit 211, the user can select one of the plurality of aberration generation amounts generated in the interchangeable lens 1 according to the shooting situation. It becomes possible to select from. Then, based on the aberration information selected by the user, each of the first drive unit 111, the second drive unit 112, and the third drive unit 113 causes the first lens unit 101, the second lens unit 102, and the third lens unit 103. Each can be moved.

4 (A) to 4 (D) are examples of photographs taken by the camera system according to the embodiment. FIG. 4A shows an example of a photograph taken without reflecting the aberration, FIG. 4B shows an example of a photograph taken reflecting the aberration of image plane curvature, and FIG. 4C reflects the aberration of spherical aberration. FIG. 4 (D) shows an example of a photograph taken by reflecting the aberration of the upper and lower one-sided blur.

Since the type and amount of aberration required are different depending on the shooting situation and the taste of the user, it is not optimal to store the type and amount of aberration generated in advance in the interchangeable lens 1. However, in the present embodiment, it is possible to determine the type and amount of aberration generated by the user himself and store the target value of the aberration adjustment amount in the camera system.

According to the camera system of the present embodiment, the aberration can be easily determined while confirming the effect of the amount of aberration generated by the user on the photograph actually selected by the user. Further, since the aberration adjustment amount is determined based on the operation amount of the image processing, it is easy to determine the drive amount of the aberration adjustment group in the interchangeable lens 1. It is not realistic to determine the type and amount of aberration from a photograph that has undergone image processing without using the operation amount of image processing because it is not easy to distinguish the type of aberration.

As described above, in the present embodiment, it is possible to provide a camera system whose optical performance can be adjusted so that a user can capture an desired image. Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

The present embodiment includes an aberration adjustment group that can be driven based on an electric signal in the eccentricity direction, the optical axis OA direction, and the tilting direction, but the present invention is not limited to this. For example, when limiting the types of adjustable aberrations, it is sufficient that there is at least one electrically driveable aberration adjustment group.

In the present embodiment, an example is shown in FIG. 2 as an operation screen for image processing, but the types of adjustable aberrations are not limited to this. For example, curvature of field and coma may be adjustable. The number of cursors C may be increased or decreased according to the type of adjustable aberration. Further, the rod shape indicating the adjustment range of the cursor C is not limited to this shape. It may be a more intuitive operation screen design.

1 Interchangeable lens (lens device)
2 Camera body (imaging device)
101 First lens unit (optical system)
102 Second lens unit (optical system)
103 Third lens unit (optical system)
111 First drive unit (drive unit)
112 Second drive unit (drive unit)
113 Third drive unit (drive unit)
108 Aberration information storage unit (storage unit)
208 Image processing unit (image processing means)
211 Aberration information selection unit (selection means)
215 Memory

Claims (10)

An image processing means that performs image processing on a captured image and creates aberration information of the captured image from the result of the image processing.
A storage unit that stores the aberration information and
With at least one optical system,
It comprises at least one drive unit capable of electrically moving the optical system.
A camera system characterized in that the optical system is moved by the driving unit based on the aberration information stored in the storage unit. The camera system according to claim 1, wherein the aberration information is stored in an image file when the captured image is recorded. The image processing means has an operating means for performing at least one image processing according to the aberration information.
The camera system according to claim 2, wherein the aberration information is created based on the operation amount of the at least one operation means. The camera system according to claim 3, wherein the first position of the operation amount of the at least one operation means is determined based on the aberration information stored in the image file. The camera system according to claim 3 or 4, wherein the type and number of the at least one operating means are determined according to the type and amount of the adjustable aberration stored in the storage unit. The storage unit can store a plurality of the aberration information.
Further having a selection means for the user to select one from the plurality of stored aberration information.
The camera system according to any one of claims 1 to 5, wherein the optical system is moved by the driving unit based on the aberration information selected by the user. A plurality of the optical systems are provided, and the optical system is provided.
A plurality of the driving units are provided so as to correspond to the optical system.
The camera system according to any one of claims 1 to 6, wherein each of the driving units moves each of the optical systems in an eccentric direction, an optical axis direction, or a tilting direction. A lens device including the optical system and
An image pickup device provided with an image pickup device that captures an image formed by the lens device, and an image pickup device.
The camera system according to any one of claims 1 to 7, wherein the camera system comprises. The camera system according to claim 8, wherein the lens device is removable from the image pickup device. The camera system according to claim 8 or 9, wherein the image processing means is provided in the image pickup apparatus.

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