Imaging device and control method thereof, lens device, image magnification correction data, image processing device and image processing method, and accessory device

Abstract

To provide an imaging apparatus and a method for controlling the same, a lens device, data for image magnification correction, an image processing apparatus and an image processing method, and an accessory device for appropriately correcting bleeding of an image that is photographed while a focus range is restricted.MEANS FOR SOLVING THE PROBLEM: An imaging apparatus acquires, from a lens device, information on image magnification correction according to the state of a member that sets a focus range of the lens device. The imaging apparatus corrects the angle of view of an image photographed by using the lens device based on the information on image magnification correction and information on the state of the lens device during the photographing of the image. The information on the state of the lens device during the photographing includes the state of the member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an imaging device and a control method thereof, a lens device, image magnification correction data, an image processing device and an image processing method, and an accessory device. [Background technology]

[0002] A technique for correcting a change in the angle of view (breathing) caused by movement of a focus lens is known (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-42405 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, breathing is corrected by cropping an image captured at a focus lens position on the close side where the angle of view is wider, with infinity as the narrowest angle of view as a reference. As a result, unnecessary cropping may occur on an image captured with a limited focus range (movement range of the focus lens).

[0005] Furthermore, when correcting for breathing, which results in the narrowest angle of view at the closest end, an image captured at the focus lens position on the infinity side is enlarged and cropped. In this case, too, unnecessary enlargement and cropping may occur for an image captured with a limited focus range (drive range of the focus lens).

[0006] The present invention has been made in view of the problems with the conventional technology. In one aspect, the present invention provides an imaging device and a control method thereof, a lens device, image magnification correction data, an image processing device and image processing method, and an accessory device, all of which are capable of appropriately correcting breathing in an image captured with a limited focus range. [Means for solving the problem]

[0007] The above object is to, for example, focus This is achieved by an imaging device that has an acquisition means for acquiring information regarding image magnification correction according to the state of the component that sets the range, and a correction means for correcting the angle of view of an image captured using a lens device based on the information regarding image magnification correction and information regarding the state of the lens device at the time the image was captured, wherein the information regarding the state of the lens device at the time of capture includes the state of the component. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an imaging device and a control method thereof, a lens device, image magnification correction data, an image processing device and image processing method, and an accessory device for appropriately correcting breathing in an image captured with a limited focus range. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic block diagram of a lens device and an imaging device according to the present invention; [Figure 2] FIG. 1 is a schematic diagram showing the relationship between the position of the focus lens and the correction magnification of the present invention. [Figure 3] FIG. 10 is a schematic diagram showing the correction magnification in a limited focus driving range state according to the present invention; [Figure 4] FIG. 1 is a schematic diagram showing the relationship between the position of the focus lens and the correction magnification of the present invention. [Figure 5] 1 is an operation flow diagram of the image magnification correction process of the present invention; [Figure 6] A lens communication flow diagram between the lens device of the present invention and the imaging device. [Figure 7] FIG. 1 is an explanatory diagram of the structure of image magnification correction data according to the present invention; [Figure 8] White balance control flow chart DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below based on exemplary embodiments with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the claimed invention. Furthermore, although multiple features are described in the embodiments, not all of them are necessarily essential to the invention, and multiple features may be combined arbitrarily. Furthermore, in the accompanying drawings, the same reference numerals are used to designate the same or similar components, and redundant explanations will be omitted.

[0011] The following description will be given of an embodiment of the present invention using a digital camera. However, imaging functions such as an imaging element and an imaging optical system are not essential for the present invention. Therefore, the present invention can be implemented in any electronic device capable of handling image data. In addition to imaging devices, such electronic devices include computer devices (personal computers, tablet computers, media players, PDAs, etc.), mobile phones, smartphones, game consoles, robots, drones, and drive recorders. These are merely examples, and the present invention can also be implemented in other electronic devices.

[0012] ●(First embodiment) 1 is a block diagram showing an example of the functional configuration of an imaging system including a lens device and an imaging device according to an embodiment of the present invention. A lens device 150 is detachably attached to the imaging device 100 via a lens mount unit 180. The lens device 150 may be integrated into the imaging device 100.

[0013] First, the internal configuration of the imaging device 100 will be described. The imaging element 102 is, for example, a CCD image sensor or a CMOS image sensor. The imaging element 102 has a plurality of pixels, each having a photoelectric conversion unit, arranged two-dimensionally, and converts the optical image generated by the lens device 150 into a pixel signal group (analog image signal). The imaging element 102 has, for example, color filters in a primary color Bayer array. Therefore, each pixel has a color filter of one of R (red), G (green), or blue (B). Note that color filters other than those in the primary color Bayer array may also be used.

[0014] For example, the image sensor 102 may use a color filter in which complementary color filters are arranged. Furthermore, in order to suppress image blur, the image sensor 102 is movable in the x-axis and y-axis directions of a plane perpendicular to the optical axis of the lens device 150. The movement of the image sensor 102 is controlled by the system control unit 130 via the imager driving unit 109.

[0015] The image generation unit 103 converts the analog image signal obtained from the image sensor 102 into a digital image signal. The digital image signal is input to the memory control unit 105 and the image processing unit 140.

[0016] The timing generation unit 104 supplies a clock signal and a synchronization signal to the image sensor 102 , the image generation unit 103 , the memory control unit 105 , the system control unit 130 and the image processing unit 140 .

[0017] The memory control unit 105 controls the image generation unit 103, the timing generation unit 104, the image display device 106, the memory 107, the recording unit 108, and the image processing unit 140. The digital image signal from the image generation unit 103 is written into the memory 107 and the recording unit 108 via the image processing unit 140 and the memory control unit 105.

[0018] The image display device 106 is, for example, an LCD or an organic EL display. When the imaging device 100 is in a shooting mode, the image display device 106 sequentially displays moving images captured using the image sensor 102, thereby realizing an electronic viewfinder (EVF) function. When the imaging device 100 is in a playback mode, the image display device 106 displays images recorded in the memory 107 and the recording unit 108. The image display device 106 also displays a user interface such as a menu screen, information related to the imaging system, and the like.

[0019] The memory 107 stores still image data and video data obtained by shooting or read from the recording unit 108, and is used as a work area for the system control unit 130. A part of the memory 107 may be used as video memory for the image display device 106. The memory 107 also has a nonvolatile area that stores setting values ​​for the imaging device 100, programs executed by the system control unit 130, GUI data, etc. The nonvolatile area of ​​the memory 107 also stores data related to optical aberration correction and image magnification correction for the lens device 150, which will be described later.

[0020] The recording unit 108 is, for example, a removable memory card. Images obtained by shooting are stored in a data file and recorded in the recording unit 108. The recording unit 108 may be a storage device built into the imaging device 100.

[0021] The shutter control unit 110 drives the shutter 101 under the control of the system control unit 130 .

[0022] SW1 (switch 1) 115 is turned on by half-pressing the shutter switch. The system control unit 130 recognizes the turning on of SW1 as an instruction to prepare for shooting a still image, and executes predetermined shooting preparation operations. The shooting preparation operations may include AF (autofocus detection) processing, AE (automatic exposure control) processing, AWB (automatic white balance adjustment) processing, etc.

[0023] SW2 (switch 2) 116 is turned on by fully pressing the shutter switch. The system control unit 130 recognizes the turning on of SW2 as an instruction to start capturing a still image, and executes a predetermined still image capturing operation. The still image capturing operation may include an exposure operation of the image sensor 102 according to exposure conditions, an operation of generating a still image data file for recording from an image signal obtained from the image sensor 102, and an operation of recording the generated still image data file in the recording unit 108.

[0024] Camera operation unit 117 is a general term for input devices such as switches, buttons, and keys that are provided so that the user can give instructions to imaging device 100. The input devices that make up camera operation unit 117 have names that correspond to the functions assigned to them. For example, camera operation unit 117 includes a video recording switch, a shooting mode selection dial for selecting a shooting mode, a menu button, directional keys, an enter key, and the like.

[0025] The functions assigned to the same input device may be variable. The input device may be a software button or key using a touch display. The operation unit 117 may also include an input device that supports non-contact input methods such as voice input and eye-gaze input.

[0026] The gyro sensor 118 generates a signal corresponding to the attitude of the image capturing device 100 and outputs it to the system control unit 130. The signal output by the gyro sensor 118 is used to control the movement of the image capturing element 102 and the drive of the shift lens 154 for image blur correction.

[0027] The I / F (interface) 120 is a communication interface with the lens apparatus 150. The I / F 120 is electrically connected to the I / F 170 of the lens apparatus 150 via a connector 190. The system control unit 130 can communicate with the lens control unit 160 via the I / F 120. The system control unit 130 acquires information about the lens apparatus 150 and controls the operation of the lens apparatus 150 by communicating with the lens control unit 160 via the I / F 120.

[0028] The connector 190 is an electrical contact point that transmits signals and power between the image capture device 100 and the lens device 150 .

[0029] The system control unit 130 is one or more processors (CPUs) capable of executing programs. The system control unit 130 executes programs stored in a nonvolatile area of ​​the memory 107 to control the operations of the imaging device 100 and the lens device 150 and realize the functions of the imaging system. The system control unit 130 monitors the operations of the shutter switches 115 and 116 and the camera operation unit 117, and when an operation is detected, executes processing according to the operation.

[0030] The AF control unit 131, AE control unit 132, lens communication control unit 133, and optical correction control unit 134 in the control unit 130 are functional blocks that represent some of the operations performed by the system control unit 130. Therefore, the operations of these control units 131 to 134 are actually realized by the system control unit 130 executing a program.

[0031] AF control unit 131 controls the AF processing of imaging device 100. AF control unit 131 determines the focus lens driving amount based on information such as the focal length and the position of focus lens 151 obtained from lens device 150 via I / F 120, and an AF evaluation value generated by, for example, image processing unit 140. AF control unit 131 controls the position of focus lens 151 by transmitting a control signal including the focus lens driving amount to lens device 150 via lens communication control unit 133 and I / F 120.

[0032] The AE control unit 132 is responsible for AE processing of the imaging device 100. The AE control unit 132 determines exposure conditions (aperture value, shutter speed, ISO sensitivity, etc.) based on information such as the maximum aperture F-number and focal length obtained from the lens device 150 via the I / F 120 and, for example, an AE evaluation value generated by the image processing unit 140. The AE control unit 132 controls the opening size of the diaphragm 153 by transmitting a control signal including the aperture value to the lens device 150 via the lens communication control unit 133 and the I / F 120. The AE control unit 132 also controls the gain used in the imaging element 102 based on the ISO sensitivity.

[0033] The lens communication control unit 133 controls communication processing between the imaging device 100 and the lens device 150. When the attachment of the lens device 150 is detected via the I / F 120, the imaging device 100 becomes able to communicate with the lens device 150 via the lens communication control unit 133.

[0034] For example, when the system control unit 130 transmits an information request signal, the lens control unit 160 transmits information about the lens device 150 to the image capture device 100 by performing an operation such as that shown in the flowchart in FIG. 5, which will be described later. The image capture device 100 and the lens device 150 can communicate with each other at any timing or at a timing based on an image capture synchronization signal output from the timing generation unit 104. When the image capture synchronization signal is input from the timing generation unit 104, the lens device 150 may transmit status information, which is information about the current status of the lens device 150, in a synchronization signal communication mode. The status information may include the focus lens position, focus lens state, aperture value, focal length, and variable aberration amount. Note that the variable aberration amount is transmitted only by specific models of lens devices 150 and may not be included.

[0035] The optical correction control unit 134 reads information related to optical aberration correction, including design data, and data related to image magnification correction from the memory 107 in accordance with the information received from the lens device 150, and determines a correction value according to the state information of the lens device from the read information. The optical correction control unit 134 sets the determined correction value in the image processing unit 140, thereby controlling processes related to optical aberration correction, such as image magnification correction, distortion aberration correction, chromatic aberration of magnification correction, peripheral illumination correction, and image restoration in the image processing unit 140.

[0036] The image processing unit 140 applies various processes to the digital image signal to generate signals and image data, and acquire and / or generate various types of information. The image processing unit 140 may be a dedicated hardware circuit such as an ASIC designed to realize a specific function, or may have a configuration in which at least some of the functions are realized by a processor such as a DSP executing a program.

[0037] Here, the image processing applied by the image processing unit 140 includes color interpolation processing, correction processing, detection processing, data processing, evaluation value calculation processing, special effect processing, and the like. Color interpolation is a process of interpolating values ​​of color components that cannot be obtained during shooting, and is also called demosaic processing. The correction processing includes white balance adjustment, gradation correction, correction of image degradation caused by optical aberrations in the imaging optical system of the lens device 150 (image restoration), correction of the effects of peripheral light falloff in the imaging optical system, color correction, and the like. The detection process includes detection of characteristic regions (for example, face regions or human body regions) and their movements, and person recognition processing. The data processing includes processes such as synthesis, scaling, encoding and decoding, and header information generation (data file generation). The evaluation value calculation process includes processes such as generating signals and evaluation values ​​used in autofocus (AF) detection, and generating evaluation values ​​used in automatic exposure control (AE). Special effect processing includes adding a blur effect, changing color tones, relighting, and the like. The above-described processes are examples of processes that can be applied by the image processing unit 140, and do not limit the processes that can be applied by the image processing unit 140.

[0038] The image processing unit 140 can generate image data according to the intended use. Of these, image data for recording is stored in a data file in a format according to the settings and recorded in the recording unit 108. Furthermore, image data for display is displayed on the image display device 106.

[0039] Resizer 141, image magnification correction unit 142, distortion aberration correction unit 143, magnification chromatic aberration correction unit 144, peripheral illumination correction unit 145, and image restoration unit 146 in image processing unit 140 are functional blocks that represent some of the operations performed by system control unit 130. Therefore, the operations of these functional blocks 141 to 146 are actually performed by image processing unit 140.

[0040] The image magnification correction unit 142 corrects the breathing of the lens device 150 to the reference angle of view by applying enlargement processing and cropping processing to the image with a widened angle of view. The operation of the image magnification correction unit 142 will be described in detail later.

[0041] The distortion correction unit 143 applies distortion correction processing to the digital image signal based on the distortion correction data acquired by the optical correction control unit 134 .

[0042] The chromatic aberration of magnification correction unit 144 applies correction processing for the chromatic aberration of magnification to the digital image signal based on the correction data for the chromatic aberration of magnification acquired by the optical correction control unit 134 .

[0043] The peripheral light amount correction unit 145 applies peripheral light amount correction processing to the digital image signal based on the peripheral light amount correction data acquired by the optical correction control unit 134 .

[0044] The image restoration unit 146 applies image restoration processing to the digital image signal based on the correction data for image restoration acquired by the optical correction control unit 134 .

[0045] Next, a description will be given of the lens device 150. The lens device 150 has an imaging optical system made up of a plurality of optical members, including a focus lens 151, a zoom lens 152, and a shift lens 154, which are movable lenses.

[0046] The focus lens 151 moves in the optical axis direction to adjust the focal distance of the imaging optical system. The zoom lens 152 moves in the optical axis direction to adjust the focal length (angle of view) of the imaging optical system. The aperture 153 has a variable aperture diameter (aperture value) and adjusts the amount of light incident on the imaging device 100 from the lens device 150 . The shift lens 154 is movable in the x-axis and y-axis directions that are perpendicular to the optical axis and perpendicular to each other, and the movement is controlled so as to suppress image blur caused by the movement of the imaging device 100.

[0047] Focus control unit 155 drives focus lens 151 under the control of lens control unit 160 or lens operation unit 161. Furthermore, focus control unit 155 outputs focus information such as the current position of focus lens 151 or the focal length of the imaging optical system to lens control unit 160.

[0048] The zoom control unit 156 drives the zoom lens 152 under the control of the lens control unit 160 or the lens operation unit 161. The zoom control unit 156 also outputs to the lens control unit 160 zoom information such as the current focal length of the imaging optical system.

[0049] The zoom lens 152 may have an aberration variable lens for varying the amount of optical aberration of the imaging optical system. The movement of the aberration variable lens in the optical axis direction is also controlled by the zoom control unit 156. When the zoom lens 152 has an aberration variable lens, the zoom control unit 156 outputs information related to the amount of variable aberration to the lens control unit 160.

[0050] The aperture control unit 157 drives the aperture 153 under the control of the lens control unit 160 or the lens operation unit 161, and controls the opening amount (aperture value) of the aperture 153. In addition, the aperture control unit 157 outputs aperture information such as the current aperture value to the lens control unit 160.

[0051] The angular velocity detection unit 158 ​​detects the angular velocity of the lens device 150 in a specific direction (for example, the yaw and pitch directions), and outputs the detected angular velocity to the lens control unit 160.

[0052] The optical image stabilization control unit 159 drives the shift lens 154 based on angular velocity information of the lens device 150 and information based on the output of the gyro sensor 118 of the imaging device 100, under the control of the lens control unit 160. In addition, the optical image stabilization control unit 159 outputs position information of the shift lens 154 to the lens control unit 160.

[0053] The lens information storage unit 165 is a non-volatile memory that stores static information about the lens device 150, such as design data about optical aberration of the lens device 150 (image pickup optical system), design data about image magnification correction, and the presence or absence and number of states of a focus limit switch. The lens information storage unit 165 can be referenced by the lens control unit 160.

[0054] The lens control unit 160 has, for example, a processor (CPU) capable of executing a program, a non-volatile memory for storing the program, and a memory for loading the program to be executed. The lens control unit 160 controls the operation of each functional block by executing the program with the CPU. The lens control unit 160 also transmits information about the lens device 150 in response to a request from the system control unit 130, and controls the aperture 13. 5 and controls the driving of movable members such as the focus lens 151.

[0055] The lens operation unit 161 is a general term for input devices that are provided on the housing of the lens device 150 and allow the user to switch and adjust settings related to the operation of the lens device 150. The lens operation unit 161 may include, for example, a focus limit switch, a focus operation ring, a zoom operation ring, an AF / MF switch, an image stabilization on / off switch, an aberration variable control ring, etc. These are examples, and other operation members may also be included.

[0056] The focus limit switch is a switch that specifies the focus range (focusing range or driving range of focus lens 151) of lens device 150. In this embodiment, as an example, lens device 150 has a focus limit switch that can specify the following three focus ranges (modes): Full mode This is a mode in which there is no limit to the driving range of the focus lens 151. The focus lens is driven over the entire movable range (for example, the range from the closest end (<0.3 m) to the infinity focusing distance). Macro mode This is a mode in which focus lens 151 is driven with the focusing distance limited to a close-up range (for example, 0.3 m to 0.5 m) suitable for macro photography. Normal mode This is a mode in which focus lens 151 is driven within a range of focusing distances (for example, 0.5 m to infinity) suitable for general photography such as portrait photography and distant views. Note that modes other than the full mode are merely examples, and the number and types of modes are arbitrary.

[0057] For a lens apparatus 150 that does not have a focus limit switch, the image capture apparatus 100 can be treated as a lens apparatus that has only a full mode or a normal mode. The focus range of the lens apparatus 150 can also be controlled by the settings of the image capture apparatus 100 in the same way as the focus limit switch. Therefore, the system control unit 130 recognizes the focus range by taking into account the presence and / or state of a focus range setting in the image capture apparatus 100, as well as the presence and / or state of a focus limit switch.

[0058] When the lens control unit 160 detects an operation of the lens operation unit 161, it transmits the operation content to the imaging device 100 (system control unit 130) via the I / F 170. When the system control unit 130 receives the operation content of the lens operation unit 161 via the I / F 120, it switches the operation mode of the functions of the lens device 150 according to the operation content.

[0059] The I / F (interface) 170 is a communication interface with the imaging device 100. The I / F 170 is electrically connected to the I / F 120 of the imaging device 100 via a connector 190. The lens control unit 160 can communicate with the system control unit 130 via the I / F 170. The lens control unit 160 transmits information about the lens device 150 and controls the operation of the lens device 150 by communicating with the system control unit 130 via the I / F 170.

[0060] Next, the image magnification correction process executed by the imaging device 100 in this embodiment will be described. The image magnification correction process is a process for correcting the angle of view variation (breathing) of the lens device 150 (image pickup optical system) that occurs when the focus lens 151 is driven. Here, the angle of view variation is corrected by applying enlargement processing and cropping processing to an image captured at an angle of view wider than the reference angle of view to generate an image equivalent to the reference angle of view. In the present invention, the system control unit 130 can control the image magnification correction process by setting an angle of view correction value for correcting the angle of view variation in the image magnification correction unit 142 of the image processing unit 140.

[0061] Next, a method for determining the angle-of-view correction value will be described. The system control unit 130 can determine the angle-of-view correction value by referring to information about image magnification correction, information about the lens apparatus 150, and information about the imaging apparatus 100, which will be described later.

[0062] The information related to image magnification correction is information for correcting variations in the angle of view according to the position of the focus lens (the focal length of the lens device 150), and includes a correction magnification, a reference magnification, and a maximum magnification. These magnifications change according to the focal length, focal length, variable aberration amount, and the state of the focus limit switch of the lens device 150. Furthermore, the amount of information included in the information related to image magnification correction may vary depending on the model of the lens device 150. Therefore, information related to image magnification correction suitable for the lens device 150 is stored in advance in the lens information storage unit 165 of the lens device 150.

[0063] Instead of the correction magnification, other information that can be used to obtain the correction magnification may be used. For example, the angle of view fluctuation rate according to the position of the focus lens may be used. The correction magnification can be obtained by obtaining the reciprocal of the angle of view fluctuation rate.

[0064] The system control unit 130 acquires information related to image magnification correction from the lens device 150 through communication with the lens control unit 160, and stores the information in the memory 107. Note that the information related to image magnification correction may be acquired from an external device with which communication is possible via an external interface (such as a USB, wireless LAN, or Bluetooth (registered trademark) interface) that the imaging device 100 has. Alternatively, information related to image magnification correction for a plurality of lens device models may be stored in advance in the memory 107, and information corresponding to the model of the attached lens device 150 may be acquired from the memory 107.

[0065] The system control unit 130 obtains information about the current state of the lens device 150, such as the focus lens position, focal length, and state of the focus limit switch, from the lens device 150 at any timing and / or at a timing synchronized with the imaging frame.

[0066] The system control unit 130 also acquires information about the image capturing device 100, such as shooting conditions based on AE processing, user settings, etc. Then, the system control unit 130 determines a view angle correction value using the acquired information about the lens device 150 and the image capturing device 100.

[0067] Information relating to image magnification correction will now be described in detail. Fig. 2 is a diagram schematically illustrating an example of the relationship between the position of the focus lens of a lens device and the correction magnification. In Fig. 2 and the following description, for ease of understanding, a focal distance corresponding to the focus lens position may be used instead of the focus lens position.

[0068] In the example shown by solid line 201 in Figure 2, the correction magnification is 100% when the focus lens is positioned at a focal distance of 0.3 m. A magnification of 100% corresponds to 1x, meaning that the image remains at its original size (not enlarged). Similarly, the correction magnifications when the focus lens is positioned at a focal distance of 0.5 m and infinity are 130% and 150%, respectively. In this way, a lens device with the relationship shown in Figure 2 has the characteristic that the angle of view on the infinity side becomes wider due to breathing.

[0069] By setting the correction magnification as the angle of view correction value in image magnification correction unit 142 according to the relationship of solid line 201, system control unit 130 can correct the change in angle of view caused by the change in focus lens position (focusing distance). This is the image magnification correction process.

[0070] The relationship shown in FIG. 2 changes depending on the state of the lens device 150 (focal length and variable aberration). Therefore, relationships are stored for multiple states of the lens device 150. If the relationship in one state can be converted to the relationship in another state, the reference relationship and information required for the conversion may be stored. If the relationship can be expressed as a function of the state, the function may be stored. When storing relationships for each state, in order to reduce the amount of storage required, it is possible to store relationships for multiple discrete states, as described below.

[0071] 3 is a diagram schematically illustrating an example of the relationship between the position of the focus lens and the correction magnification in accordance with the state of a focus limit switch when the lens operation unit 161 of the lens device 150 has the focus limit switch. As described above, it is assumed here that the focus limit switch can be set to any of full mode, macro mode, and normal mode.

[0072] FIG. 3(a) is a diagram schematically illustrating an example of the relationship between correction magnification and focus lens position when the focus limit switch is in full mode. 302 indicates that the correction magnification at the focus lens position corresponding to a focusing distance of 0.3 m from the closest end is the reference magnification. 303 indicates that the correction magnification is maximum at the focus lens position corresponding to a focusing distance of infinity, which is 150% when the reference magnification is 100%. When the focus limit switch is in full mode, image magnification correction is possible for focusing distances from the closest end to infinity (the entire movable range of the focus lens), but the image is enlarged by a maximum of 150% (1.5x).

[0073] FIG. 3(b) is a diagram showing a typical example of the relationship between the correction magnification and the focus lens position when the focus limit switch is in macro mode. In macro mode, the focus lens is driven within a limited focal distance range of 0.3 to 0.5 m. 305 indicates that the correction magnification at the focus lens position corresponding to a focal distance of 0.3 m is the reference magnification. 306 indicates that the correction magnification is maximized at the focus lens position corresponding to a focal distance of 0.5 m, which is 130% when the reference magnification is 100%. When the focus limit switch is in macro mode, the maximum magnification is 130%, which allows the maximum magnification to be reduced relative to the reference magnification compared to full mode.

[0074] FIG. 3(c) is a diagram showing a typical example of the relationship between the correction magnification and the focus lens position when the focus limit switch is in the normal mode. In the normal mode, the focus lens is driven within a limited range of focal distances from 0.5 m to infinity. 308 indicates that the correction magnification at the focus lens position corresponding to a focal distance of 0.5 m is the reference magnification. 309 indicates that the correction magnification is maximized at the focus lens position corresponding to a focal distance of infinity, which is 115% when the reference magnification is 100%. When the focus limit switch is in the normal mode, the maximum magnification is 115%, which allows the maximum magnification to be reduced relative to the reference magnification compared to full mode and macro mode.

[0075] In this manner, in this embodiment, the maximum magnification of the image within the driving range of the focus lens can be suppressed by changing the correction magnification, which serves as the reference magnification, depending on the driving range of the focus lens. Because image quality deteriorates when the image is enlarged, a lower maximum magnification is preferable. Conventionally, even when the driving range of the focus lens is limited, the magnification was determined in the same manner as in full mode, resulting in an unnecessarily large magnification and a deterioration in image quality. Furthermore, unnecessary cropping occurs on the image to which the reference magnification is applied.

[0076] For example, even when normal mode is set, the magnification based on full mode is conventionally applied, so an image taken at a focal distance of 0.5 m, the closest end of the focus lens's driving range, is enlarged by 130% (1.3x). Furthermore, to match the angle of view of an image taken at a focal distance of infinity with the angle of view at a focal distance of 0.5 m, an additional 115% (1.15x) is enlarged. In other words, an image taken at a focal distance of infinity is enlarged by a total magnification of 1.5x (1.3x x 1.15x).

[0077] In contrast, in this embodiment, the correction magnification for an image captured at a focal distance of 0.5 m, which is the closest end of the driving range of the focus lens, is set as the reference magnification. Therefore, enlargement processing is not applied to images captured at a focal distance of 0.5 m (100% (1x) enlargement processing may be applied). Therefore, the total magnification of enlargement processing applied to correct angle of view fluctuations for images captured at a focal distance of infinity is 1.15x, which makes it possible to suppress degradation of image quality due to enlargement.

[0078] This embodiment is based on a lens device in which the angle of view becomes wider as the focusing distance increases due to lens breathing. Therefore, the correction magnification at the focus lens position corresponding to the shortest focusing distance at which the angle of view is smallest within the driving range of the focus lens is set to the reference magnification. This embodiment can suppress changes in the angle of view due to lens breathing while also suppressing image quality degradation due to correction of the angle of view more effectively than in the past.

[0079] A method for obtaining the correction magnification from the reference magnification and maximum magnification according to the focus limit switch will be explained using Figure 4. The focus limit switch can be set to either full mode, macro mode, or normal mode, as in Figure 3.

[0080] FIG. 4 corresponds to an example in which the reference magnification and maximum magnification are set as follows according to the state of the focus limit switch. Full mode: Standard magnification is 100% correction magnification, maximum magnification is 150% Macro mode: Standard magnification is 100% and maximum magnification is 130% Normal mode: Standard magnification is 130% of the correction magnification, and the maximum magnification is 150%

[0081] 4 shows an example of the relationship between the position of the focus lens and the correction magnification. The relationship shown by the solid line 201 is the same as that shown in FIG. 402 indicates the correction magnification at the focus lens position corresponding to a focal distance of 0.3 m. 403 indicates the correction magnification at the focus lens position corresponding to a focal distance of 0.5 m. Reference numeral 404 denotes the correction magnification at the focus lens position corresponding to the infinity focal distance.

[0082] If the driving range of the focus lens is not taken into consideration, as shown in FIG. 2, 402 is 100%, 403 is 130%, and 404 is 150%. In full mode, the focus lens is driven over its entire range of motion. As a result, as in Figure 2, the correction magnification of 100% at the focus lens position corresponding to a focal distance of 0.3 m is used as the reference magnification, and magnification processing is applied up to a maximum of 150% at the focus lens position corresponding to a focal distance of infinity. This corresponds to the same image magnification correction processing as shown in Figure 3(a).

[0083] In macro mode, the focus lens is driven within a range corresponding to a focus range of 0.3 to 0.5 m. In this case, the correction magnification of 100% at the focus lens position corresponding to a focus distance of 0.3 m is used as the reference magnification, and magnification processing is applied up to a maximum magnification of 130% at the focus lens position corresponding to a focus distance of 0.5 m. This corresponds to the image magnification correction processing shown in Figure 3(b).

[0084] In normal mode, the focus lens is driven within a range corresponding to a focus range of 0.5 to infinity. In this case, the correction magnification of 130% at the focus lens position corresponding to a focus distance of 0.5 m is used as the reference magnification, and correction is performed up to a maximum magnification of 150% at the focus lens position corresponding to a focus distance of infinity. By changing the correction magnification of 130% in full mode to the reference magnification of 100%, the maximum magnification becomes 115%. This corresponds to the image magnification correction process shown in Figure 3(c).

[0085] The system control unit 130 can determine the angle of view correction value to be set in the image magnification correction unit 142 as follows. The correction magnification corresponding to the focus lens position (focusing distance) is set as the angle of view correction value, and the angle of view correction value is determined as follows. When the angle of view correction value is less than the reference magnification: the angle of view correction value = 100%. When the angle of view correction value is equal to or greater than the reference magnification and less than the maximum magnification: angle of view correction value = angle of view correction value / reference magnification x 100%. When the angle of view correction value is greater than the maximum magnification: angle of view correction value = maximum magnification / reference magnification x 100%.

[0086] For example, the angle of view correction value for normal mode is 130% for the reference magnification (focusing distance 0.5 m) and 150% for the maximum magnification (focusing distance infinity). The correction magnification (130%) of 403 corresponding to a focusing distance of 0.5 m is equal to or greater than the reference magnification (130%), so the angle of view correction value is 130 / 130×100% to 130%. Furthermore, the correction magnification (150%) of 404 corresponding to a focusing distance infinity is equal to the maximum magnification, so the image correction value is 150 / 130×100% to 115%. This is equivalent to the relationship shown in FIG. 3(c).

[0087] Even when the focus range is set to full mode, macro mode, or normal mode by the settings of the imaging device 100, the system control unit 130 can determine the angle of view correction value in the same way as when the mode is set by the focus limit switch.

[0088] If the lens device 150 does not have a focus limit switch, the system control unit 130 acquires information related to image magnification correction stored in the lens device 150. The system control unit 130 also acquires the focus lens position (focus distance), the reference magnification, and the maximum magnification. The system control unit 130 can then determine the angle of view correction value as follows:

[0089] When the angle of view correction value is smaller than the reference magnification: the angle of view correction value = 100%. When the angle of view correction value is equal to or greater than the reference magnification and less than the maximum magnification: angle of view correction value = angle of view correction value / reference magnification x 100%. When the angle of view correction value is equal to or greater than the maximum magnification: angle of view correction value = maximum magnification / reference magnification x 100%. In this way, the system control unit 130 can determine the angle of view correction value by the same process whether the lens device 150 has a focus limit switch or not.

[0090] The reference magnification and maximum magnification may be changed in accordance with the information stored in the lens device 150 in response to a user instruction from the camera operation unit 117 .

[0091] In the example shown above, a configuration was described in which when the drive range of the focus lens is limited on the close side, the reference magnification is changed so that the correction magnification corresponding to the close end of the limited drive range becomes 100% (1x). However, when the drive range of the focus lens is limited on the close side, the effect of the present invention of suppressing the maximum magnification can be obtained by making the correction magnification corresponding to the close end of the drive range smaller than in full mode (but not less than 100%).

[0092] Next, the procedure of the image magnification correction process described above will be described with reference to the flowchart shown in FIG. In S501, the system control unit 130 acquires information related to image magnification correction for the attached lens device 150, and stores the information in a non-volatile area of ​​the memory 107 in association with, for example, the model name of the lens device 150. S501 can be executed when the imaging device 100 is started up, when attachment of the lens device 150 is detected, when a predetermined user instruction is detected, etc. Note that if information related to image magnification correction for the lens device 150 is already stored in the memory 107, S501 does not need to be executed.

[0093] 7 is a diagram showing an example of the data configuration of data (image magnification correction data) related to image magnification correction stored in memory 107. The image magnification correction data has a basic information area 701, a header area 702, and a correction value storage area 703. In this embodiment, when the lens device 150 is a zoom lens with a variable focal length, the focal length range between the wide end and the telephoto end is divided into multiple areas as information related to image magnification correction. Then, a reference magnification and a maximum magnification are stored for each combination of the focal length at the division point and the state of the focus limit switch. In addition, the focusable distance range is divided into multiple areas, and a correction magnification is stored for each combination of the focal length and the focus distance corresponding to the division point.

[0094] The basic information area 701 stores information indicating whether the lens device supports image magnification correction and information indicating the number of pieces of correction information. The system control unit 130 can determine whether the attached lens device 150 supports image magnification correction by referring to the basic information area 701. If the system control unit 130 determines that the attached lens device 150 does not support image magnification correction, it may perform shooting without performing image magnification correction.

[0095] The header area 702 stores the number of divisions nNum of the focal length range of the lens device 150 (multiple in the case of a zoom lens), the number of divisions fNum of the focusable distance range, the number of states swNum of the focus limit switch, information on the division points of each piece of information, etc. swNum is a natural number greater than or equal to 1, and swNum = 1 indicates that the lens device does not have a focus limit switch.

[0096] Discrete values ​​of the focal length are stored in the focal length n[0] to n[nNum-1]. The focal distances f[0][0] to f[nNum-1][fNum-1] store discrete focal distance values ​​for each discrete focal length. The reference magnifications b[0][0] to b[nNum-1][swNum-1] store the correction magnifications that become the reference magnification for each combination of the state of the focus limit switch and a discrete focal length. The maximum magnifications m[0][0] to m[nNum-1][swNum-1] store the corrected magnification that becomes the maximum magnification for each combination of the state of the focus limit switch and the discrete focal length.

[0097] A correction magnification for each combination of a discrete focal length and a discrete in-focus distance is stored in the correction value storage area 703. This correction magnification corresponds to the correction magnification in full mode.

[0098] The system control unit 130 can obtain the reference magnification and maximum magnification from the header area 702 based on the state of the focus limit switch and the focal length of the lens device 150 at the time of shooting.

[0099] Furthermore, the system control unit 130 can acquire the corresponding correction magnification from the correction value storage area 703 based on the focal length and in-focus distance (focus lens position) of the lens device 150 at the time of shooting.

[0100] The system control unit 130 can obtain information corresponding to a combination of values ​​that is not stored by linearly interpolating a combination of values ​​that is close to the stored combination.

[0101] The total amount of stored information can be known from the number of divisions (number of pieces of information) of the focal length range, the number of divisions of the focusable distance range, and the number of states of the focus limit switch stored in the header area 702. Furthermore, if the data stored in the header area 702 and the correction value storage area 703 is of a fixed length, it is easy to know the address where the required information is stored.

[0102] It should be noted that the number of divisions sNum of the aberration variable information, the aberration variable information s, and the corresponding image magnification may be used instead of the focal length n. When the lens device 150 storing the aberration variable information is attached, the imaging device 100 performs image magnification correction processing according to the amount of aberration variable.

[0103] Once the information necessary for image magnification correction is prepared in the memory 107, the system control unit 130 waits for detection of turning on SW2 or operation of the video shooting start button while executing processing in a shooting standby state. Processing in the shooting standby state is, for example, live view display processing or processing in response to user operations other than those on the shutter buttons 115 and 116.

[0104] In S502, the system control unit 130 starts the shooting operation when it detects that SW2 is turned on or the video shooting button is operated.

[0105] In S503, the system control unit 130 performs automatic exposure control (AE) and auto focus detection (AF) processing, etc. The details of the processing may be different between still image shooting and video shooting.

[0106] In S504, the system control unit 130 controls the operation of the image sensor 102 and other components to capture a still image or one frame of a moving image. The image generation unit 103 also generates a digital image signal from the analog image signal read out from the image sensor 102.

[0107] In S505, the system control unit 130 acquires information (shooting information) about the state of the lens device 150 at the time of shooting in S504 from the lens control unit 160. The shooting information includes the focal length and the in-focus distance (focus lens position), and may further include a variable aberration amount depending on the model of the lens device 150. The system control unit 130 stores the acquired shooting information in the memory 107.

[0108] In S506, the system control unit 130 acquires the state of the focus limit switch of the lens device 150 from the lens control unit 160 and stores it in the memory 107. Note that the state of the focus limit switch may also be acquired as shooting information in S505.

[0109] In S507, the system control unit 130 determines a field of view correction value from the information regarding image magnification correction acquired in S501, the shooting information acquired in S505, and the state of the focus limit switch acquired in S506, and sets the value in the image magnification correction unit 142.

[0110] In S508, the system control unit 130 controls the image processing unit 140 to apply image processing, including image magnification correction processing, to the one frame image acquired in S504. The image processing unit 140 generates a still image data file or a video data file for recording, and image data for display. The image data for display is stored in the memory 107, and the image data file for recording is recorded in the recording unit 108.

[0111] In S509, system control unit 130 determines whether the conditions for ending shooting are met. For example, if SW2 remains on during still image shooting, or if operation of the video shooting button is not detected during video shooting, system control unit 130 determines that the conditions for ending shooting are not met and executes S503 to shoot the next frame. On the other hand, for example, if SW1 and SW2 are off during still image shooting, or if operation of the video shooting button is detected during video shooting, system control unit 130 determines that the conditions for ending shooting are met, and ends the processing shown in FIG. 5.

[0112] Next, a communication operation between the lens device 150 and the imaging device 100 will be described using the flowchart shown in Fig. 6. Communication between the lens device 150 and the imaging device 100 is initiated by either the lens device 150 or the imaging device 100.

[0113] In S601, the lens control unit 160 transmits basic information to the system control unit 130. The basic information may be static information of the lens device 150 stored in the lens device 150, such as model information, whether or not image magnification correction information is present, whether or not a focus limit switch is present and the number of states of the focus limit switch, etc. Note that the system control unit 130 may transmit model information of the imaging device 100 to the lens control unit 160. S601 may be executed, for example, when the imaging device 100 is started up or when the lens device 150 is attached to the imaging device 100.

[0114] In S602, the lens control unit 160 determines whether or not a request for information regarding image magnification correction has been received from the system control unit 130. If it is determined that a request has been received, the lens control unit 160 executes S603; if not, the lens control unit 160 executes S604.

[0115] In S603, the lens control unit 160 transmits information related to image magnification correction stored in the lens information storage unit 165, i.e., the image magnification correction data shown in Fig. 7, to the system control unit 130. Then, the lens control unit 160 executes S604.

[0116] In S604, the lens control unit 160 determines whether or not a request for the state of the focus limit switch has been received from the system control unit 130. If it is determined that a request has been received, the lens control unit 160 executes S605; if not, the lens control unit 160 executes S606.

[0117] In S605, the lens control unit 160 transmits information indicating the state of the focus limit switch to the system control unit 130. Then, the lens control unit 160 executes S606.

[0118] In S606, the lens control unit 160 determines whether or not a request for shooting information has been received from the system control unit 130. If it is determined that a request for shooting information has been received, the lens control unit 160 executes S607; if not, the lens control unit 160 executes S608.

[0119] In S607, the lens control unit 160 transmits information about the current focal length and the in-focus distance as shooting information to the system control unit 130. Then, the lens control unit 160 executes S608.

[0120] In S608, the lens control unit 160 determines whether or not a communication stop instruction has been received from the system control unit 130, and if it is determined that it has been received, it ends communication with the system control unit 130, and if it is not determined that it has been received, it executes S602.

[0121] Here, the case where the correction of the angle of view variation is performed before recording has been described. However, the correction of the angle of view variation may also be performed after recording. For example, the image data for recording may include information related to the image magnification correction shown in FIG. 7 or information that can identify the information related to the image magnification correction (such as the model name of the lens device), as well as shooting information for each frame (including the state of the focus limit switch). A device that processes the recorded image data can obtain information related to the image magnification correction from an image data file or an external device, and use this information together with the shooting information to correct the angle of view variation in the recorded image data.

[0122] (Variation 1) When the focus range is changed during continuous shooting of still images or video shooting, it may be determined whether to change the reference magnification depending on the focus range before and after the change. For example, when switching from full mode to normal mode, the reference magnification may not be changed when switching to normal mode, and correction may be continued in full mode so that the angle of view does not change midway.

[0123] (Variation 2) In this embodiment, the correction of angle of view variation for a lens device in which the angle of view widens on the infinity side has been described. However, similar correction is possible for a lens device in which the angle of view widens on the close-up side. In this case, in the relationships shown in FIGS. 2 to 4, the close-up end and infinity positions of the focus lens position are reversed, and the magnification becomes the trimming ratio. If the maximum distance of the focus range is limited to a distance closer than infinity, the trimming ratio of the focus lens position at the infinity side end of the limited focus range can be changed to 100% (no trimming). This can prevent unnecessary trimming.

[0124] (Variation 3) In this embodiment, an example has been described in which the lens device 150 transmits the image magnification correction data to the image capturing device 100, but the image capturing device 100 may be configured to acquire the image magnification correction data by another method.

[0125] For example, when an adapter device is connected between the lens device 150 and the imaging device 100, the imaging device 100 may acquire image magnification correction data for the lens device 150 from the adapter device. For example, when the adapter device has image magnification correction data for a lens device of a type different from that of the lens device 150, the adapter device may receive information indicating the type of lens device attached from the lens device 150 or the imaging device 100. The adapter device may then transmit image magnification correction data for the lens device of the type corresponding to the received information to the imaging device 100. Examples of adapter devices include a mount converter that converts mount types, an extender with an optical system, a speed booster, etc. Devices that can be directly attached to the imaging device 100, such as the adapter device and the lens device 150, are collectively referred to as accessory devices.

[0126] (Variation 4) In addition, in the present embodiment, an example has been described in which multiple corrections for each condition (for example, the shooting state of the lens device 150) are stored in the image magnification correction data, and the imaging device 100 identifies a correction value by comparing the image magnification correction data with the conditions at the time of shooting. Here, a configuration may be adopted in which the lens device 150 performs a process of comparing the image magnification correction data with the conditions at the time of shooting, and transmits the identified correction value to the imaging device 100.

[0127] (Variation 5) Furthermore, some or all of the configuration of this embodiment may be configured to be performed on a server. For example, the imaging device 100 may be configured to download image magnification correction data for the lens device 150 stored in storage on the server, rather than in the lens device 150, from the server. Alternatively, the imaging device 100 may be configured to transmit the type of lens 150 and the conditions at the time of shooting to the server, and then download correction values ​​corresponding to the conditions at the time of shooting from the server. Alternatively, the captured still image data or video data and the conditions at the time of shooting corresponding to this data may be uploaded to the server, image processing may be performed in a processing unit on the server, and the corrected still image or video may be obtained from the server.

[0128] (Variation 6) The image magnification correction of this embodiment may also be performed by an image processing device such as a PC. In this case, the image processing device acquires image magnification correction data from a server or the like, and acquires still image data or video data directly or indirectly from the imaging device 100, thereby performing image magnification correction.

[0129] In this embodiment, information regarding image magnification correction corresponding to the state of the components that set the focus range of the lens device is acquired, and the angle of view of an image captured using the lens device is corrected based on the information regarding image magnification correction and information regarding the state of the lens device at the time the image was captured. For example, if the driving range of the focus lens of the lens device is limited, the reference magnification used in image enlargement processing to correct changes in the angle of view that occur as the focus lens moves can be changed according to the driving range. In this case, changes in the angle of view can be corrected without unnecessarily enlarging the image, thereby suppressing degradation of image quality due to the correction.

[0130] ●(Second embodiment) Next, a second embodiment of the present invention will be described. This embodiment relates to white balance adjustment processing in the image processing unit 140. When trimming is performed to correct breathing, if the area removed by trimming is reflected in the white balance adjustment processing, the color of the image after trimming may change unnaturally.

[0131] In response to this problem, the present embodiment achieves appropriate white balance adjustment processing even when image magnification correction processing is performed.

[0132] FIG. 8 is a flowchart relating to the white balance control process when the image magnification correction process is performed. In S901, the image processing unit 140 acquires shooting information for a frame to be processed. Note that the shooting information may be supplied to the image processing unit 140 when it is acquired by the system control unit 130. In S902, the image processing unit 140 acquires the maximum magnification for image magnification correction from the memory 107 based on the state of the focus limit switch included in the shooting information or acquired separately. For example, if the state of the focus limit switch in the lens device described in the first embodiment is the normal mode, the maximum magnification obtained is 115%.

[0133] In S903, the image processing unit 140 uses the maximum magnification to determine the reduction ratio R of the detection area to be used in the WB adjustment process. The detection area is a detection area for calculating a WB correction value for a pixel estimated to be white, a detection area for calculating a WB correction value for a specific subject (for example, natural green), or a characteristic area such as a face related to WB control.

[0134] The image processing unit 140 can determine the reduction ratio R of the detection area using the maximum magnification Emax acquired in S902, for example, according to the following formula (1). R=1 / Emax (1) For example, when the focus limit switch is in the normal mode, the maximum magnification is 115%, so the reduction ratio of the detection area is determined to be 87%.

[0135] In S904, the image processing unit 140 sets a detection area to be used for WB adjustment processing using the reduction ratio determined in S903. Specifically, the image processing unit 140 reduces the detection area to be used for WB control when image magnification correction processing is not performed so that the reduction ratio becomes the reduction ratio calculated in S903.

[0136] In S905, the image processing unit 140 uses the detection area set in S904 to calculate a WB correction value in the same way as when image magnification correction processing is not performed. Note that since the process of calculating a WB correction value using an area of ​​white pixels or pixels of a specific color from an image as a detection area is well known, a detailed description thereof will be omitted.

[0137] As described above, according to this embodiment, when the correction of the angle of view change due to lens breathing is accompanied by a trimming process, the area removed by the trimming process is not reflected in the white balance adjustment process. As a result, the white balance adjustment process is performed based on the corrected image area visually recognized by the user, and color changes due to the influence of the area removed by the trimming process can be suppressed.

[0138] Although the white balance adjustment process has been described above, the white balance correction value is an example of an evaluation value based on an image. The same effect can be achieved for other evaluation values ​​based on an image by not using the area removed by the trimming process.

[0139] (Other embodiments) The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program.The present invention can also be realized by a circuit (e.g., ASIC) that realizes one or more functions.

[0140] The present invention is not limited to the above-described embodiments, and various modifications and variations are possible without departing from the spirit and scope of the invention. Therefore, the following claims are appended to clarify the scope of the invention. [Explanation of symbols]

[0141] 100...imaging device, 102...imaging element, 130...system control unit, 140...image processing unit, 142...image magnification correction unit, 150...lens device, 151...focus lens, 160...lens control unit, 161...lens operation unit, 165...lens information storage unit

Claims

1. an acquisition unit that acquires, from a lens device, information regarding image magnification correction according to a state of a member that sets a focus range of the lens device; a correction unit that corrects the angle of view of an image captured using the lens device based on information related to the image magnification correction and information related to the state of the lens device at the time the image was captured; and The imaging device according to claim 1, wherein the information about the state of the lens device at the time of shooting includes the state of the member.

2. the information regarding the image magnification correction includes a reference magnification and a maximum magnification for each state of the member; 2. The imaging device according to claim 1, wherein the correction means corrects the angle of view of the image based on the reference magnification and the maximum magnification according to the state of the member at the time of photographing.

3. the information about the state of the lens device at the time of photographing includes a focal length; 3. The imaging device according to claim 2, wherein the correction means corrects the angle of view of the image using a magnification ranging from the reference magnification to the maximum magnification according to the state of the member and the focal distance.

4. the focal length of the lens device is variable, and the information regarding the image magnification correction is information corresponding to a combination of the state of the member and the focal length; the information about the state of the lens device at the time of photographing includes a focal length; 3. The imaging device according to claim 2, wherein the correction means corrects the angle of view of the image based on the reference magnification and the maximum magnification according to a combination of the state of the component at the time of shooting and the focal length.

5. 5. The imaging device according to claim 4, wherein the correction means corrects the angle of view by enlarging the image by a magnification of 1, where the correction magnification corresponds to the reference magnification according to the combination of the focal length and the state of the component at the time of shooting, among the correction magnifications according to the combination of the focal length and the focusing distance of the lens device.

6. 6. The imaging device according to claim 5, wherein the acquisition unit further acquires the correction magnification from the lens device.

7. an acquisition step in which an acquisition unit acquires, from the lens device, information regarding image magnification correction according to a state of a member that sets the focus range of the lens device; a correction step in which a correction unit corrects the angle of view of an image captured using the lens device based on information related to the image magnification correction and information related to the state of the lens device at the time of capturing the image; and The control method for an imaging device, wherein the information about the state of the lens device during imaging includes the state of the components.

8. A lens device that is detachable from an imaging device, a storage means for storing information regarding image magnification correction according to the state of a member for setting the focus range of the lens device; a transmitting unit for transmitting information relating to the image magnification correction to an imaging device to which the lens device is attached.

9. 9. The lens device according to claim 8, wherein the information regarding image magnification correction includes a reference magnification and a maximum magnification for each state of the member.

10. the transmitting means further transmits information about the state of the lens device to the imaging device in response to a request from the imaging device; 10. The lens device according to claim 8, wherein the information relating to the state of the lens device includes a focal length and the state of the member.

11. 10. The lens device according to claim 8, wherein the focal length of the lens device is variable, and the information regarding the image magnification correction is information corresponding to a combination of the state of the member and the focal length.

12. 11. The lens device according to claim 10, wherein the focal length of the lens device is variable, and the information about the state of the lens device further includes the focal length.

Images