Lens device, imaging device, and control method for lens device

Abstract

This enables image processing devices that do not have a function to correct for angle-of-view changes caused by focusing to also correct for such changes. [Solution] The lens device 100 has storage means 14, 15 for storing correction information used in a first correction process performed by an image processing device 200 on an image generated by imaging through an imaging optical system 11, and control means 18 for transmitting the correction information to the image processing device. The imaging optical system has a configuration that generates distortion aberration and angle of view fluctuation due to focusing. The correction information includes first correction information used to correct distortion aberration by the first correction process, and second correction information used to correct angle of view fluctuation along with distortion aberration by the first correction process. The control means transmits at least one of the first correction information and the second correction information to the image processing device.

Description

Technical Field

[0001] The present invention relates to a lens device used for imaging.

Background Art

[0002] In some imaging optical systems, when the focus lens is moved, an angle-of-view variation (focus breathing) occurs. Patent Document 1 discloses an imaging device that corrects focus breathing by converting the size of an image based on the imaging magnification for each position of the focus lens.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, some imaging devices do not have a function of correcting focus breathing. It is desirable that such imaging devices can also correct focus breathing.

Means for Solving the Problems

[0005] A lens device, as one aspect of the present invention, comprises an imaging optical system, a storage means for storing correction information used in a first correction process performed by an image processing device (imaging device) on an image generated by imaging through the imaging optical system, and a control means for transmitting the correction information to the image processing device. The imaging optical system has a configuration that generates distortion aberration and angle of view fluctuation due to focusing. The correction information does not include first correction information used to correct distortion aberration by the first correction process, and second correction information used to correct angle of view fluctuation along with distortion aberration by the first correction process. The control means is characterized by transmitting at least one of the first correction information and the second correction information to the image processing device. An image processing device that receives at least one of the first correction information and the second correction information from the above lens device as correction information and performs a first correction process on the image using the correction information also constitutes another aspect of the present invention. [Effects of the Invention]

[0006] According to the present invention, even an imaging device that does not have a function to correct for field of view fluctuations can correct for field of view fluctuations along with distortion aberrations using second correction information. [Brief explanation of the drawing]

[0007] [Figure 1] A block diagram showing the configuration of the lens device and camera in the embodiment. [Figure 2] A figure showing the first correction information in the embodiment. [Figure 3] A figure showing the second correction information in the embodiment. [Figure 4] A figure showing the third correction information in the embodiment. [Figure 5] A flowchart illustrating the process in Example 1. [Figure 6] A flowchart illustrating the process in Example 2. [Figure 7] A flowchart illustrating the process in Example 2. [Figure 8] A diagram showing distortion and an example of its correction result. [Modes for carrying out the invention]

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0009] Figure 1 shows the configuration of a camera system as an embodiment. The camera system comprises a lens device 100 and an imaging device (hereinafter referred to as "camera") 200 as an image processing device. The camera 200 is a digital video camera, a digital still camera, a broadcast camera, a surveillance camera, etc. The lens device 100 is attached to the camera 200 in a way that allows for attachment and communication.

[0010] The lens device 100 includes an imaging optical system 11, a focus position sensor 13, a first correction information storage unit 14, a second correction information storage unit 15, and a third correction information storage unit 16 as storage means, a lens CPU 18 as a control means, and a communication unit 17. The imaging optical system 11 includes a focus lens group 12. By moving the focus lens group 12 in the optical axis direction of the imaging optical system 11, a state of focus can be obtained in the focus range from a close object to an object at infinity. The focus lens group 12 may be one group or multiple groups, such as in a floating focus system. The imaging optical system 11 has an optical configuration that produces distortion aberration and focus breathing as a change in the angle of view due to the movement (focusing) of the focus lens group 12. The focus position sensor 13 detects the position of the focus lens group 12 in the optical axis direction.

[0011] The first correction information storage unit 14 stores (prepares) first correction information. The first correction information is used in the first correction process to correct distortion aberration in the image generated by imaging in the camera 200, and consists of multiple correction values ​​that differ for each image height. The second correction information storage unit 15 stores second correction information. The second correction information is used in the first correction process to correct distortion aberration in the image generated by imaging and to simultaneously correct (suppress) focus breathing, and consists of multiple correction values ​​that differ for each image height. Details of the first and second correction information will be described later.

[0012] The third correction information storage unit 16 stores the third correction information. The third correction information is used in the breathing correction process (second correction process), which corrects focus breathing by enlarging the image generated by imaging and converting the image size, separate from the distortion aberration correction (first correction process), and is information indicating the magnification ratio of the image. The function of performing the breathing correction process as the second correction process in the camera 200 is called the breathing correction function.

[0013] The first to third correction information storage units 14 to 16 may store the first to third correction information in advance when the lens device 200 is shipped from the factory, or they may temporarily store the first to third correction information downloaded via communication from a server on the cloud each time it is used for imaging.

[0014] The lens CPU 18 is a computer that controls the driving of the zoom lens group (not shown), aperture unit, and focus lens group 12 included in the imaging optical system 11. The lens CPU 18 can also transmit first correction information, second correction information, and third correction information to the camera 200 via the communication unit 17.

[0015] The camera 200 has an imaging element 21 and a camera CPU 22. The imaging element 21 is a photoelectric conversion element such as a CCD sensor or a CMOS sensor that photoelectrically converts (images) the optical image formed by the imaging optical system 11. The camera CPU 22 is a computer and includes an image processing unit 23 and an ID storage unit 24.

[0016] When the camera 200 is attached to the lens device 100, it transmits the camera identification information (hereinafter referred to as camera ID) read from the ID storage unit 24 to the lens CPU 18 via the communication unit 17 of the lens device 100. The camera ID is information for identifying the model and individual of the camera 200, such as the model name and serial number of the camera 200.

[0017] The image processing unit 23 performs image processing on the imaging signal from the imaging element 21 to generate an image. Further, the image processing unit 23 performs the first correction processing described above on the generated image (correction target image). Among the plurality of cameras to which the lens 100 can be attached, there are models with the bleeding correction function and models without the bleeding correction function as described above in the image processing unit 23.

[0018] Furthermore, the image processing unit 23 determines the shape of the distortion aberration from the image. When the shape of the distortion aberration is a spiral type, the magnification indicated by the third correction information may be changed to a magnification appropriate for correcting the spiral type distortion aberration. Thereby, it becomes possible to correct the spiral type distortion aberration well.

[0019] Note that the image processing unit 23 may be provided in the lens device 100 or may be configured as an image processing device separate from the camera system.

[0020] The lens CPU 18 may decide which of the first, second, or third correction information to send to the camera 200 based on the camera ID, that is, depending on whether the camera 200 has a breathing correction function determined from the camera ID. Specifically, if the lens CPU 18 determines from the camera ID that the camera 200 has a breathing correction function, it sends the first and third correction information to the camera 200. If the lens CPU 18 determines from the camera ID that the camera 200 does not have a breathing correction function, it sends the second correction information to the camera 200. The breathing correction function is a function that suppresses (corrects) focus breathing by performing a process that transforms the size of the image to be corrected with a magnification ratio (third correction information) that is independent of the image height.

[0021] The lens CPU 18 may also transmit all of the first, second, and third correction information to the camera 200, regardless of the camera ID. In this case, the camera 200 will decide which of the first, second, and third correction information to use, depending on whether or not it has its own breathing correction function and whether or not the breathing correction function selected by the user is enabled or disabled.

[0022] Furthermore, the lens CPU 18 may transmit to the camera 200 any correction information requested by the camera 200 from among the first correction information, second correction information, and third correction information. For example, if the camera 200 has a breathing correction function (or if the breathing correction function is enabled), it will request the lens CPU 18 to transmit the first correction information and the third correction information, and the lens CPU 18 will respond by transmitting the first correction information and the third correction information to the camera 200. If the camera 200 does not have a breathing correction function (or if the breathing correction function is disabled), it will request the lens CPU 18 to transmit the second correction information, and the lens CPU 18 will respond by transmitting the second correction information to the camera 200.

[0023] Figure 2 shows an example of first correction information when the imaging optical system is in a zoom state and focused on a certain subject distance. The vertical axis represents the image height, and the horizontal axis represents the correction values ​​that constitute the first correction information. The solid line 26 represents the correction value for correcting negative distortion (barrel distortion), and the dashed line 27 represents the correction value for correcting positive distortion (pincushion distortion). The image processing unit 23 performs a first correction process to reduce distortion using this first correction information.

[0024] Figure 3 shows an example of second correction information when the imaging optical system is in the same state as in Figure 2. The vertical axis represents image height, and the horizontal axis represents the correction values ​​that constitute the second correction information. The solid line 31 represents the correction value for correcting barrel distortion, and the dashed line 27 represents the correction value for correcting pincushion distortion. The second correction information corresponds to each correction value of the first correction information shown in Figure 2 being offset by the breathing correction component C necessary for correcting focus breathing. Component C is a constant value regardless of image height. The image processing unit 23 uses this second correction information to perform the first correction processing to simultaneously reduce distortion and focus breathing.

[0025] Figure 4 shows an example of third correction information when the imaging optical system is in a zoom state. The vertical axis represents the magnification, and the horizontal axis represents the position of the focus lens group 12 (focus position). The magnification increases from 1 as the focus position moves from infinity to near. The image processing unit 23 of the camera 200, which has a breathing correction function, uses this third correction information to perform a second correction process to reduce focus breathing.

[0026] The first correction information and the second correction information are preferably expressed by the following formulas. The first correction information (correction value) f1 is preferably expressed by the following formula (1), where Y is the image height and Y' is the ideal image height, which is the ideal image height obtained by the paraxial magnification.

[0027] f1=(Y′-Y) / Y (1) Here, the ideal image height Y′ is expressed by the following equation (1-1) when the focal length of the imaging optical system is f and the half-angle of view is θ, for example, in the case of a general lens using a central projection method.

[0028] Y′=f×tanθ (1-1) In addition, for other projection methods (such as isometric projection and equisolid angle projection), the ideal image height Y' can also be expressed by an equation relating to the ideal image height Y' that corresponds to each projection method (for example, in the case of isometric projection, Y' = f × θ).

[0029] By using a correction value expressed as in equation (1), it becomes easier to correct the distortion aberration of the imaging optical system in the image.

[0030] Furthermore, the second correction information (correction value) f2 is preferably expressed by the following equations (2-1) and (2-2), where the constant term (breathing correction component) is C.

[0031] 0 <Yのとき、f2={(Y′-Y) / Y}+C (2-1) When Y=0, f2=0 (2-2) Here, equation (2-1) shows the correction value when the image height Y is not at the image center, and equation (2-2) shows the correction value when the image height Y is at the image center. By using the correction values ​​expressed as in equations (2-1) and (2-2), distortion aberration and focus breathing can be corrected simultaneously.

[0032] Furthermore, the first and second correction information can be stored in each memory unit in various formats. For example, it may be stored in the form of polynomial coefficients, or in the form of a constant multiplier. It may also be stored in the form of a percentage, or as discrete correction values ​​corresponding to various zoom states and focus positions. If discrete correction values ​​are used, correction values ​​that are not stored can be calculated by interpolation operations such as linear interpolation.

[0033] Furthermore, the constant term C in the second correction information is preferably the paraxial image magnification of the imaging optical system. When y is the distance from the optical axis of an object point on the object plane, and y' is the distance from the optical axis of an image point on the image plane corresponding to the object point, the paraxial image magnification β is defined by the following equation (3).

[0034] β = y' / y (3) By using the paraxial image magnification β, which corresponds to the zoom state and focus position at the time of image acquisition of the image to be corrected, as a constant term C, it becomes possible to correct focus breathing more effectively.

[0035] The second correction information preferably includes a correction value that can correct the distortion of out-of-focus subject images. When the imaging mode of the camera 200 is a video mode that requires focus breathing correction (i.e., during video recording), the image to be corrected may contain many out-of-focus subject images. For this reason, it is more effective to correct the distortion of out-of-focus subject images, such as distant landscape images, using the second correction information, regardless of the focus position.

[0036] Furthermore, as shown in Figure 1, it is preferable to provide the lens device 100 with a third correction information storage unit 16 that stores a magnification ratio (third correction information) for performing a magnification process as a second correction process on the image to be corrected after distortion correction processing using the first correction information. This makes it possible to correct focus breathing appropriately for the lens device 100 when the lens device 100 is mounted on a camera 200 that has a breathing correction function.

[0037] Furthermore, it is preferable that the first correction processing using the first correction information is performed when the imaging mode of the camera 200 is in still image mode (i.e., when capturing still images). This ensures that in the camera 200 without a breathing correction function, no magnification processing is performed in still image mode, and a sufficient field of view of the imaging optical system is secured when imaging subjects at infinity. In the camera 200 with a breathing correction function, magnification processing is performed even in still image mode.

[0038] Next, we will explain the processes performed by the lens device 100 and the camera 200, respectively. [Examples]

[0039] The flowchart in Figure 5 shows the process that the lens CPU 18 executes according to the program in Example 1.

[0040] When the lens device 100 is attached to the camera 200 and the camera system is powered on, in step S51, the lens CPU 18 receives the camera ID from the camera 200.

[0041] Next, in step S52, the lens CPU 18 determines from the camera ID whether or not the camera 200 has a breathing correction function. If it has a breathing correction function, it performs the process in step S53; otherwise, it performs the process in step S54.

[0042] In step S53, the lens CPU 18 transmits the first correction information and the third correction information to the camera 200. Then the process ends. As a result, the image processing unit 23 of the camera 200 performs a first correction process on the image to be corrected using the first correction information to correct distortion, and then performs a second correction process using the third correction information to correct focus breathing.

[0043] In step S54, the lens CPU 18 transmits second correction information to the camera 200 and terminates this process. As a result, the image processing unit 23 of the camera 200 performs a first correction process on the image to be corrected using the second correction information to correct both distortion and focus breathing.

[0044] According to this embodiment, a camera 200 that performs the first correction process but does not have a breathing correction function can be made to correct distortion aberration and focus breathing. [Examples]

[0045] The flowchart in Figure 6 shows the process that the camera CPU 22 executes according to the program in Example 2.

[0046] When the lens device 100 is attached to the camera 200 and the camera system is powered on, in step S61, the camera CPU 22 starts communication with the lens CPU 18 and receives first correction information, second correction information, and third correction information from the lens CPU 18. The camera CPU 22 also transmits the camera ID to the lens CPU 18.

[0047] Next, in step S62, the camera CPU 22 starts imaging in response to the user's imaging instruction. Then, in step S63, the camera CPU 22 instructs the image processing unit 23 to generate the image to be corrected.

[0048] Next, in step S64, the camera CPU 22 determines whether the camera 200 has a breathing correction function (or whether the user has selected to enable the breathing correction function). If it has a breathing correction function, it performs the process in step S65; if it does not have a breathing correction function (or whether the user has selected to disable the breathing correction function), it performs the process in step S66.

[0049] In step S65, the camera CPU 22 instructs the image processing unit 23 to perform a first correction process (distortion correction process) using the first correction information on the image to be corrected, and then to perform a second correction process (breathing correction process) using the third correction information. Then it performs the process in step S67.

[0050] In step S69, the camera CPU 22 instructs the image processing unit 23 to perform a first correction process (correction of distortion and focus breathing) using the second correction information for the image to be corrected. Then it performs the process in step S67.

[0051] In step S67, the camera CPU 22 outputs the corrected image. The output image is either recorded on a recording medium (not shown) attached to the camera 200 or displayed on a monitor (not shown) provided on the camera 200. Then the process ends.

[0052] According to this embodiment, a camera 200 that performs the first correction process but does not have a breathing correction function can be made to correct distortion aberration and focus breathing. [Examples]

[0053] The flowchart in Figure 8 shows the process that the camera CPU 22 executes according to the program in Example 3.

[0054] When the lens device 100 is attached to the camera 200 and the camera system is powered on, in step S71, the camera CPU 22 starts communication with the lens CPU 18 and sends the camera ID to the lens CPU 18.

[0055] Next, in step S72, the camera CPU 22 determines whether the camera 200 has a breathing correction function (or whether the user has selected to enable the breathing correction function). If it has a breathing correction function, it performs the process in step S73; if it does not have a breathing correction function (or whether the user has selected to disable the breathing correction function), it performs the process in step S74.

[0056] In step S73, the camera CPU 22 requests the lens CPU 18 to transmit the first correction information and the third correction information, and receives the first correction information and the third correction information from the lens CPU 18. Then it performs the process in step S75.

[0057] In step S74, the camera CPU 22 requests the lens CPU 18 to transmit the first correction information and the second correction information, and receives the first correction information and the second correction information from the lens CPU 18. Then it performs the process in step S75.

[0058] In step S75, the camera CPU 22 starts imaging in response to the user's imaging instruction. Then, in step S76, the camera CPU 22 instructs the image processing unit 23 to generate the image to be corrected.

[0059] Next, in step S77, the camera CPU 22 determines whether the imaging mode of the camera 200 is video mode or not (still image mode). If it is in video mode, it performs the process in step S78; if it is in still image mode, it performs the process in step S712.

[0060] In step S78, the camera CPU 22 determines again whether the camera 200 has a breathing correction function (or whether the user has selected to enable the breathing correction function). If it has a breathing correction function, it performs the process in step S710; if it does not have a breathing correction function (or if the user has selected to disable the breathing correction function), it performs the process in step S711.

[0061] In step S710, the camera CPU 22 instructs the image processing unit 23 to perform a first correction process (distortion correction process) using the first correction information on the image (video) to be corrected, and then to perform a second correction process (breathing correction process) using the third correction information. Then it performs the process in step S713.

[0062] In step S711, the camera CPU 22 instructs the image processing unit 23 to perform a first correction process (correction of distortion and focus breathing) using the second correction information for the image (video) to be corrected. Then it performs the process in step S713.

[0063] In step S712, the camera CPU 22 instructs the image processing unit 23 to perform a first correction process (distortion correction process) using the first correction information for the image to be corrected (still image). Then it performs the process in step S713.

[0064] In step S713, the camera CPU 22 outputs the corrected image. The output image is either recorded on a recording medium (not shown) attached to the camera 200 or displayed on a monitor (not shown) provided on the camera 200. Then the process ends.

[0065] According to this embodiment, a camera 200 that performs the first correction process but does not have a breathing correction function can be made to correct video distortion and focus breathing. Furthermore, regardless of whether or not it has a breathing correction function, the camera 200 can be made to correct still image distortion.

[0066] The above embodiments include the following configuration.

[0067] (Composition 1) Imaging optical system, A storage means for storing correction information used in a first correction process performed on an image processing device on an image generated by imaging through the aforementioned imaging optical system, The system includes a control means for transmitting the correction information to the image processing device, The aforementioned imaging optical system has a configuration that produces distortion aberration and changes in the field of view due to focusing. The correction information includes first correction information used to correct the distortion aberration by the first correction process, and second correction information used to correct the angle of view fluctuation together with the distortion aberration by the first correction process. The lens device is characterized in that the control means transmits at least one of the first correction information and the second correction information to the image processing device. (Configuration 2) The first correction information is used in the first correction process in the image processing apparatus that performs a second correction process to correct the angle of view fluctuations for the image. The lens device according to configuration 1, characterized in that the second correction information is used in the first correction process in the image processing device that does not perform the second correction process. (Composition 3) The lens device according to configuration 2, characterized in that the control means obtains information from the image processing device indicating whether or not the image processing device performs the second correction process, and transmits the first correction information or the second correction information to the image processing device based on said information. (Composition 4) The lens device according to configuration 3, characterized in that the aforementioned information is identification information of the image processing device. (Composition 5) When the image height is Y and the ideal image height is Y', the first correction information f1 is: f1=(Y′-Y) / Y A lens device according to any one of configurations 1 to 4, characterized by being represented by the formula shown. (Composition 6) When the image height is Y, the ideal image height is Y', and a constant term independent of the image height is C, the second correction information f2 is: 0 <Yのとき、f2={(Y′-Y) / Y}+C When Y=0, f2=0 A lens device according to any one of configurations 1 to 5, characterized by being represented by the formula shown. (Composition 7) The lens device according to configuration 6, characterized in that the constant term C is the paraxial image magnification of the imaging optical system. (Composition 8) The lens apparatus according to any one of configurations 1 to 7, characterized in that the second correction information is used to correct the distortion aberration of the out-of-focus subject image by the first correction process. (Composition 9) The storage means further stores third correction information used in the second correction process on the image after the first correction process using the first correction information, The lens device according to any one of configurations 1 to 8, characterized in that the control means transmits the first correction information and the third correction information to the image processing device that performs the second correction processing. (Composition 10) The first correction information is used in the first correction process for the still image as the image. The lens device according to any one of configurations 1 to 9, characterized in that the second correction information is used in the first correction processing for the video as an image. (Composition 11) Imaging optical system, A storage means for storing correction information used in a first correction process performed on an image processing device on an image generated by imaging through the aforementioned imaging optical system, The system includes a control means for transmitting the correction information to the image processing device, The imaging optical system has a configuration that produces distortion aberration and changes in the angle of view due to focusing. The lens device is characterized in that the correction information is information used in the first correction process to correct the angle of view variation together with the distortion aberration in the image processing device which does not perform a second correction process to correct the angle of view variation. (Composition 12) The lens device according to any one of configurations 1 to 11, characterized in that the image processing device is included in an imaging device that detachably mounts the lens device and performs imaging through the imaging optical system. (Composition 13) The lens device described in any one of configurations 1 to 12 receives at least one of the first correction information and the second correction information as correction information. An image processing apparatus characterized by performing the first correction processing on the image using the correction information. (Composition 14) The lens device described in configuration 9 receives the third correction information, An image processing apparatus characterized in that, when the distortion aberration is pincushion type, the third correction information is changed according to the shape of the distortion aberration and the second correction processing is performed.

[0068] (Other examples) The present invention can also be realized by supplying a program that implements one or more of the functions of the above-described embodiments to a system or device via a network or storage medium, and by having one or more processors in the computer of that system or device read and execute the program. It can also be realized by a circuit (e.g., an ASIC) that implements one or more functions.

[0069] The embodiments described above are merely representative examples, and various modifications and changes can be made to each embodiment when implementing the present invention. [Explanation of Symbols]

[0070] 11. Imaging optical system 12 Focusing Lens Groups 18 Lens CPU 21 Image sensor 22 Camera CPU 100 Lens device 200 Cameras (imaging devices)

Claims

1. Imaging optical system, A storage means for storing correction information used in a first correction process performed on an image processing device on an image generated by imaging through the aforementioned imaging optical system, The system includes a control means for transmitting the correction information to the image processing device, The aforementioned imaging optical system has a configuration that produces distortion aberration and changes in the field of view due to focusing. The correction information includes first correction information used to correct the distortion aberration by the first correction process, and second correction information used to correct the angle of view fluctuation along with the distortion aberration by the first correction process. The lens device is characterized in that the control means transmits at least one of the first correction information and the second correction information to the image processing device.

2. The first correction information is used in the first correction process in the image processing apparatus that performs a second correction process to correct the angle of view fluctuations for the image. The lens device according to claim 1, characterized in that the second correction information is used in the first correction process in the image processing device that does not perform the second correction process.

3. The lens device according to claim 2, characterized in that the control means obtains information from the image processing device indicating whether or not the image processing device performs the second correction process, and transmits the first correction information or the second correction information to the image processing device based on said information.

4. The lens device according to claim 3, characterized in that the aforementioned information is identification information of the image processing device.

5. When the image height is Y and the ideal image height is Y', the first correction information f1 is: f1=(Y'-Y) / Y The lens device according to claim 1, characterized by being expressed by the formula shown above.

6. When the image height is Y, the ideal image height is Y', and a constant term independent of the image height is C, the second correction information f2 is: When 0 < Y, f2 = {(Y' - Y) / Y} + C When Y = 0, f² = 0 The lens device according to claim 1, characterized by being expressed by the formula shown above.

7. The lens device according to claim 6, characterized in that the constant term C is the paraxial image magnification of the imaging optical system.

8. The lens apparatus according to claim 1, characterized in that the second correction information is used to correct the distortion aberration of the out-of-focus subject image by the first correction process.

9. The storage means further stores third correction information used in the second correction process on the image after the first correction process using the first correction information, The lens device according to claim 1, characterized in that the control means transmits the first correction information and the third correction information to the image processing device that performs the second correction processing.

10. The first correction information is used in the first correction processing for a still image as the image in the image processing apparatus that does not perform the second correction processing. The lens device according to claim 1, characterized in that the second correction information is used in the first correction processing for the video as an image in the image processing device that does not perform the second correction processing.

11. Imaging optical system, A storage means for storing correction information used in a first correction process performed on an image processing device on an image generated by imaging through the aforementioned imaging optical system, The system includes a control means for transmitting the correction information to the image processing device, The imaging optical system has a configuration that produces distortion aberration and changes in the angle of view due to focusing. The lens device is characterized in that the correction information is information used in the first correction process to correct the angle of view variation together with the distortion aberration in the image processing device, which does not perform a second correction process to correct the angle of view variation.

12. The lens device according to claim 1, characterized in that the image processing device is included in an imaging device that detachably mounts the lens device and performs imaging through the imaging optical system.

13. The lens device described in any one of claims 1 to 12 receives at least one of the first correction information and the second correction information as correction information, An image processing apparatus characterized by performing the first correction processing on the image using the correction information.

14. The lens device described in claim 9 receives the third correction information, An image processing apparatus characterized in that, when the distortion aberration is pincushion type, the third correction information is changed according to the shape of the distortion aberration and the second correction processing is performed.

15. A control method for a lens device having an imaging optical system, The steps include: preparing correction information to be used in a first correction process performed by an image processing device on an image generated by imaging through the aforementioned imaging optical system; The step of transmitting the correction information to the image processing device is The aforementioned imaging optical system has a configuration that produces distortion aberration and changes in the field of view due to focusing. The correction information includes first correction information used to correct the distortion aberration by the first correction process, and second correction information used to correct the angle of view fluctuation along with the distortion aberration by the first correction process. A control method characterized by transmitting at least one of the first correction information and the second correction information to the image processing device.

16. A program characterized by causing a computer to execute a process according to the control method described in claim 15.

Images