JP5783445B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus.

  Digital cameras have become the mainstream instead of film cameras, and opportunities to shoot are increasing. However, there are places where only flash photography is permitted. For this reason, a camera capable of acquiring position information and setting shooting according to the position information has been proposed (see, for example, Patent Document 1).

JP 2007-013829 A

  However, the camera proposed in the past is capable of a part of the shooting setting according to the position information, but it cannot properly remove the influence of the aberration caused by the shooting location and shooting conditions, and the desired camera. There was a problem that images could not be obtained.

  The present invention has been made in view of such a problem, and determines whether or not aberration correction is performed by determining whether or not an image corresponding to a face is included in an image to be photographed. Accordingly, an object of the present invention is to provide an imaging apparatus configured to appropriately remove the influence of aberration caused by the shooting location, shooting conditions, and the like.

  In order to solve the above problems, an imaging apparatus according to the present invention includes an imaging unit that performs imaging using an imaging optical system, an aberration correction unit that corrects aberration of the imaging optical system, and an image captured by the imaging unit. A face detection unit that determines whether or not an image corresponding to a face is included, and an aberration correction unit that determines whether the image corresponding to the face is not included in the image by the face detection unit. And a controller for correcting aberration.

In addition, such an imaging apparatus includes an aberration detection unit that detects information about aberration from an image captured by the imaging unit, and the control unit uses the aberration correction unit based on the information about aberration detected by the aberration detection unit. The aberration of the imaging optical system is corrected .

Further, in such an imaging device, the control unit, after the correction of the aberrations of the imaging optical system according to the detection result of the face detection unit, intends line correction of aberrations of the imaging optical system according to the detection result of the aberration detector.

  In such an imaging apparatus, the imaging optical system includes a focus lens that adjusts the focus of the imaging optical system, and the control unit controls the aberration correction unit based on the position of the focus lens, thereby controlling the imaging optical system. It is preferable to correct the aberration.

  In addition, such an imaging apparatus includes a shooting location detection unit that detects information related to a shooting location where shooting is performed by the imaging unit, and shooting conditions for the imaging unit based on information related to the shooting location detected by the shooting location detection unit. It is preferable to have a setting unit for setting.

  Moreover, in such an imaging apparatus, it is preferable that the imaging location detector has a water pressure gauge.

  In such an imaging apparatus, the aberration correction unit is preferably an aberration correction optical system that can be attached to the imaging optical system.

  According to the imaging apparatus of the present invention, it is determined whether or not aberration correction is performed by determining whether or not an image corresponding to a face is included in an image to be captured, thereby determining a shooting location, a shooting condition, and the like. Thus, it is possible to appropriately remove the influence of the aberration generated by the above.

It is principal part sectional drawing of a camera system. It is an enlarged view of the photographic lens part in the state where the aberration correction converter is mounted. It is a block diagram of a camera system. It is a flowchart which shows operation | movement of a camera system, Comprising: From power-on to the process when release SW is half-pressed is shown. It is a flowchart which shows operation | movement of a camera system, Comprising: Processing after the release SW is fully pressed is shown. It is sectional drawing which shows the optical system of a photographic lens and an aberration correction converter. FIG. 5 shows various aberration diagrams when an object in the air is photographed only by the imaging optical system. FIG. 5 shows various aberration diagrams when an underwater object is photographed through an aquarium window with only the imaging optical system. FIG. 5 shows various aberration diagrams when an object in the air is photographed by an imaging optical system equipped with an aberration correction optical system. FIG. 5 shows various aberration diagrams when an underwater object is photographed by an imaging optical system equipped with an aberration correction optical system.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the configuration of the camera system 1 will be described as an example of the imaging apparatus according to the present embodiment with reference to FIGS. As shown in FIG. 1, a camera system 1 is a lens-interchangeable single-lens reflex camera that functions as an imaging device that combines a camera body 2 and an interchangeable shooting lens 3 and performs imaging with an imaging device 9 that is an imaging unit. is there.

  The photographic lens 3 drives a focus lens, a lens group 4 including a zoom lens and an anti-vibration lens, an aperture 5, an angular velocity sensor 6 that detects a shake of the camera system 1, and the lens group 4 that constitute an imaging optical system SL described later. A drive device (not shown) is provided. The angular velocity sensor 6 detects an angular velocity around at least two axes orthogonal to the optical axis. The drive device has a plurality of motors composed of, for example, a vibration wave motor and a VCM, drives the focus lens in the optical axis direction, and drives the anti-vibration lens in a direction different from the optical axis direction. The taking lens 3 has a lens CPU 7 that controls the entire taking lens 3 and cooperates with the camera body 2.

  In addition, data on the photographing distance and focal length of the photographing lens 3 and distortion aberration, field curvature, and lateral chromatic aberration corresponding to the lens group 4 are stored in a non-illustrated nonvolatile memory of the photographing lens 3 as an aberration table. .

  The camera body 2 retreats so that the light beam from the photographic lens 3 is reflected and guided to the finder optical system 8 and the light beam from the photographic lens 3 is incident on the image sensor 9 composed of a CCD or a CMOS. A main mirror 10 that swings with respect to the retracted position is provided. A partial region of the main mirror 10 is a semi-transmissive region, and the camera body 2 includes a sub mirror 12 that reflects the light beam transmitted through the semi-transmissive region to the focus detection sensor 11. The sub mirror 12 swings in conjunction with the main mirror 10, and when the main mirror 10 takes the retracted position, the sub mirror 12 also retracts from the light flux. The focus detection sensor 11 detects the focus state of the incident light beam by the phase difference method.

  The light beam reflected by the main mirror 10 at the reflection position is guided to the finder optical system 8 through the focusing screen 13 and the pentaprism 14. The finder optical system 8 is composed of a plurality of lenses, and the user can confirm the object field by the finder optical system 8.

  Further, a part of the light beam transmitted through the pentaprism 14 is guided to the photometric sensor 15. The photometric sensor 15 measures the luminance distribution of the object scene by measuring the light beam incident on the photographing lens 3 for each of a plurality of regions. Further, a GPS (Global Positioning System) module 16 is provided above the pentaprism 14 and receives a signal from a GPS satellite to acquire position information where the camera system 1 exists. . Furthermore, the camera body 2 includes a microphone 17 that captures the sound of the object scene at a position that does not interfere with the photographing lens 3 in the vicinity of the mount portion of the photographing lens 3 and a speaker 18 that emits a beep sound near the viewfinder optical system 8. Prepare.

  When the main mirror 10 is in the retracted position, the light beam from the photographing lens 3 enters the image sensor 9 through the low-pass filter 19. An imaging board 20 is provided in the vicinity of the imaging device 9, and a rear monitor 21 is provided behind the imaging board 20 so as to face the outside.

  An aberration correction converter 40, which is an aberration correction unit, can be attached to the front part (subject side) of the photographing lens 3. By attaching this aberration correction converter 40, the aberration correction of the photographing lens 3 can be performed. In the present embodiment, the aberration correction converter 40 corrects aberrations generated by the transparent member when shooting through a transparent member (for example, glass or acrylic) having a curvature, or performs underwater shooting. Aberration correction that occurs at the time is performed.

  As shown in FIG. 2, the aberration correction converter 40 includes a negative lens L1 and a positive lens L2 (aberration correction optical system CL described later), an actuator 41 that drives the negative lens L1 and the positive lens L2, and an actuator 41 A power supply unit (for example, a lithium ion battery) 42 that supplies power and a communication unit (not shown) that communicates with the communication unit 50 of the camera body 2 are included. The communication unit of the aberration correction converter 40 communicates the positions of the negative lens L1 and the positive lens L2 to the camera body 2 and transmits the movement amounts of the negative lens L1 and the positive lens L2 from the camera body 2 to the actuator 41. The positions of the negative lens L1 and the positive lens L2 are detected by an encoder (not shown). The aberration correction converter 40 moves the negative lens L1 and the positive lens L2 in the direction of the optical axis by the actuator 41, and adjusts the air space between the object side lens of the photographing lens 3 and the positive lens L2, thereby correcting the field chromatic aberration. And image surface distortion correction. For this reason, the aberration correction converter 40 stores data of driving amounts for driving the negative lens L1 and the positive lens L2 according to the material and thickness of the transparent member (for example, glass or acrylic) as a driving table in a nonvolatile memory (not shown). I remember it.

  The actuator 41 can be composed of a vibration wave motor that moves the negative lens L1 and the positive lens L2 in the optical axis direction, and a linear piezoelectric actuator that finely adjusts the position in the optical axis direction. The negative lens L1 and the positive lens L2 can also be configured to be held by a holding member having a mechanism that slides on the optical axis.

  In the present embodiment, the aberration correction converter 40 is provided with the power supply unit 42 and the communication unit. However, for example, a line that supplies power to the aberration correction converter 40 and a line that communicates with the aberration correction converter 40 are provided in the photographing lens 3. If these lines and the aberration correction converter 40 are connected, the power supply unit 42 and the communication unit can be omitted.

  FIG. 3 is a block diagram of the camera system 1 according to the present embodiment. The camera body CPU 27 controls the entire camera system 1. The imaging board 20 includes a drive circuit 23 that drives the imaging device 9, an A / D conversion circuit 24 that converts the output of the imaging device 9 into a digital signal, an image processing control circuit 25 including an ASIC, and the imaging device 9. A contrast AF circuit 26 for extracting a high-frequency component of the signal.

  The image processing control circuit 25 performs image processing such as white balance adjustment, sharpness adjustment, gamma correction, and gradation adjustment on the image signal converted into the digital signal, and also performs image compression such as JPEG to generate an image file. Generate. Further, the image processing control circuit 25 performs various aberration determinations from the image signal, and outputs information relating to the aberration of the captured image to the camera body CPU 27. For example, when chromatic aberration of magnification has occurred, the positions of the edges of R, G, and B are shifted. The amount of lateral chromatic aberration can be detected by detecting the amount of edge shift for each color. Details of a method for correcting lateral chromatic aberration using an image obtained from the image processing control circuit 25 will be described later.

  The image file generated by the image processing control circuit 25 is stored in the image recording medium 37. The image recording medium 37 may be a recording medium such as a flash memory that can be attached to and detached from the camera body 2, or may be a recording medium such as an SSD (Solid State Drive) built in the camera body 2. good.

  The image signal subjected to the image processing is displayed on the rear monitor 21 under the control of the rear monitor control circuit 28. If an image signal taken immediately after photographing is displayed on the rear monitor 21 for a predetermined time, an image corresponding to the image file recorded on the image recording medium 37 can be viewed by the user. Further, live view display can be realized by sequentially displaying on the rear monitor 21 the field images that are continuously photoelectrically converted by the image sensor 9 without being recorded on the image recording medium 37. Further, moving image shooting can be realized by recording an object scene image, which is continuously photoelectrically converted by the image sensor 9, by performing a moving image compression process such as MPEG on the image processing control circuit 25 and recording it on the image recording medium 37. it can. At this time, the sound of the object scene collected by the microphone 17 is also compressed and recorded in synchronization with the moving image data. The frame rate of the generated moving image is selected and set from a plurality of frame rates such as 30 fps, for example.

  The contrast AF circuit 26 extracts a high-frequency component of the imaging signal from the imaging device 9 to generate an AF evaluation value signal, and detects a focus lens position where the AF evaluation value signal becomes maximum. Specifically, a predetermined high-frequency component is extracted from the image signal input from the image processing control circuit 25 using a bandpass filter, and detection processing such as peak hold and integration is performed to generate an AF evaluation value signal. . The generated AF evaluation value signal is output to the camera body CPU 27.

  The lens CPU 7 drives the anti-vibration lens in the photographing lens 3 in a direction different from the optical axis direction so as to cancel the camera shake detected by the angular velocity sensor 6 to realize optical camera shake correction. The camera shake correction is not limited to such optical camera shake correction, but adopts an image sensor drive type camera shake correction in which a drive mechanism is added to the image sensor 9 to drive in a direction different from the optical axis direction and cancel the camera shake. You can also. Furthermore, an electronic camera shake that calculates a motion vector between a plurality of images output from the image processing control circuit 25 and controls image readout position so as to cancel the calculated motion vector between images and cancels camera shake. Corrections can also be employed. Optical camera shake correction and image sensor-driven camera shake correction are particularly suitable for still image shooting and are also applied to moving image shooting. Electronic camera shake correction is suitable for moving image shooting. These methods can be selectively and additionally employed.

  Further, the camera body CPU 27 performs an AF operation by controlling the operation of the focus lens constituting the photographing lens 3 according to the output of the focus detection sensor 11 in cooperation with the lens CPU 7. Furthermore, the camera body CPU 27 stores the state (focal length) of the zoom lens constituting the photographing lens 3 and information on the photographing lens 3 itself (for example, lens types such as a wide-angle lens, a telephoto lens, a macro lens, etc.). Can be obtained through.

  As described above, the photometric sensor 15 measures the luminance distribution of the object scene by measuring the luminous flux incident on the photographing lens 3 for each of a plurality of areas, and outputs the measurement result to the camera body CPU 27. The camera body CPU 27 calculates an exposure value according to the selected photometry mode. As a metering mode, a split metering mode that balances bright and dark parts, a center-weighted metering mode that properly exposes the center of the screen, a spot metering mode that properly exposes a narrow area of the selected focus point, and the like can be selected. .

  The calendar unit 38 includes a crystal oscillator, a timekeeping integrated circuit, and the like, and holds calendar information such as year / month / day / hour / minute / second. The camera body CPU 27 can appropriately detect information about time from the calendar unit 38. The GPS module 16 is a position detection unit that receives a signal from a GPS satellite and acquires latitude, longitude, and altitude information (information on the position) where the camera body 2 exists. The camera body CPU 27 can appropriately detect information related to the position where the camera body 2 exists from the GPS module 16.

  The flash ROM 29 is an EEPROM (registered trademark) and is a storage device that stores various adjustment values and setting values in addition to a program for operating the camera system 1. It should be noted that a log of aberration correction amounts at past shooting locations may be stored in the flash ROM 29 for each shooting lens 3. The flash ROM 29 stores map information, and the camera body CPU 27 obtains current position information from latitude, longitude, altitude information obtained as an output of the GPS module 16 and map information stored in the flash ROM 29. Can be acquired. That is, the camera main-end CPU 27 operates as a shooting location detection unit that detects information regarding a shooting location where shooting is performed by the imaging unit.

  The RAM 30 is a high-speed RAM such as a DRAM in which a program stored in the flash ROM 29 is expanded and the camera body CPU 27 can access at high speed. In particular, various adjustment values and setting values that are frequently referred to are also copied from the flash ROM 29 to facilitate access from the camera body CPU 27.

  The rear monitor control circuit 28 performs display control for displaying the menu setting screen and the user guide screen read from the flash ROM 29 on the rear monitor 21 in addition to the image processed as described above. Further, a touch panel sensor is stacked on the surface of the rear monitor 21, and when the user operates the touch panel sensor while visually recognizing the menu items of the rear monitor 21, the coordinates and the coordinates are displayed. The menu item is output to the camera body CPU 27.

  The event information acquisition unit 31 is an event detection unit that detects and acquires event information held at a specific facility via a network. The event information acquisition unit 31 includes a network connection unit such as a wireless LAN (not shown) and a program that acquires event information in a specific facility from the network. Note that the event information acquisition unit 31 is not limited to accessing information published on the network, but may be configured to access a database related to event information constructed in advance by the user. Further, the event information acquisition unit 31 can be internally configured so that the user accesses a database stored in the flash ROM 29 as schedule information, for example, instead of being connected to a network.

  The release SW 32 is a two-stage switch. When the user half-presses the release SW 32, shooting preparation operations such as autofocus and photometry are performed. Further, when the user fully presses the release SW 32, the camera body CPU 27 starts a still image / moving image shooting operation.

  The face detection unit 33 detects whether a face such as a person or an animal is included in the subject using the image signal that has been subjected to image processing by the image processing control circuit 25. , Feature points such as the end points of the lips are extracted from the image, and based on these feature points, it is determined whether or not the face region.

  The water pressure gauge 34 detects the water pressure applied to the camera body 2 and is used to detect whether or not the camera system 1 is used in water by the camera body CPU 27 which is a photographing location detection unit in this embodiment. It is done.

  The communication unit 50 communicates with the communication unit of the aberration correction converter 40 as described above.

  The camera body CPU 27 controls the entire camera system 1 in cooperation with the lens CPU 7 and the aberration correction converter 40.

  The shooting operation of the camera system 1 configured as described above will be described below with reference to the flowcharts of FIGS. This flowchart is assumed to be in a state where a power supply (not shown) is turned on. Further, as described above, this flowchart is executed by the camera body CPU 27 by a program stored in the flash ROM 29 and expanded in the RAM 30. That is, the camera body CPU 27 uses the information on the photographing lens 3 and the environment information from the environment detection unit including the GPS module 16, the calendar unit 38, the face detection unit 33, the water pressure gauge 34, and the like based on the flowchart. It also operates as a setting unit for setting imaging (shooting assist).

  The camera body CPU 27 acquires information on the taking lens 3 (step S1). In the present embodiment, the camera body CPU 27 acquires focal length information of the photographic lens 3. For example, it is confirmed that the photographing lens 3 is a macro lens having a focal length of 60 mm, and does not have an aberration lens for correcting aberration when photographing through a transparent member (for example, glass) having a curvature. Note that information about the photographing lens 3 may be acquired at the timing when the photographing lens 3 is attached to the camera body 2.

  The camera body CPU 27 acquires information on the shooting location (step S2). In the present embodiment, the camera body CPU 27 acquires the current position information from the latitude, longitude, altitude information obtained as the output of the GPS module 16 and the map information stored in the flash ROM 29, and from the calendar unit 38 the season Get date and time information such as month, time. The camera main body CPU 27 detects event information (event content, event start time, event end time) at the current position and its surroundings from the event information acquisition unit 31. In the present embodiment, the following description will be continued on the assumption that shooting is performed in an aquarium. The camera body CPU 27 does not have to acquire all the information described above, and may acquire information that can be used for shooting assistance as appropriate.

  The camera body CPU 27 determines whether or not the aberration correction converter 40 is necessary from the information on the shooting location acquired in step S2 (step S3). When photographing through a transparent member (for example, glass) having a curvature so as to photograph in an aquarium, if the photographing lens 3 itself does not have an aberration lens, the camera body CPU 27 performs aberration correction converter 40. Is determined to be necessary. When it is determined in step S3 that the aberration correction converter 40 is not necessary, the process proceeds to step S7. Conversely, when it is determined that the aberration correction converter 40 is necessary, the aberration correction converter 40 is further attached to the photographing lens 3. (Step S4), if not, a message from the speaker 18 or a message is displayed on the rear monitor 21 to warn that the aberration correction converter 40 needs to be attached (step S4). Step S5). Then, the camera body CPU 27 waits for confirmation of the mounting of the aberration correction converter 40 in response to this warning (step S6), and proceeds to step S7 when the mounting is confirmed. For confirmation of wearing, for example, the photographer is caused to operate the touch panel of the rear monitor 21. This confirmation includes the case where the aberration correction converter 40 is not attached at the judgment of the photographer.

  Next, the camera body CPU 27 determines whether or not the release SW 32 is half-pressed (step S7). If it is half-pressed, the process proceeds to the next step S8. If it is not half-pressed, this step S7 is repeated. . Note that the confirmation of half-pressing of the release SW 32 may be performed before acquisition of information on the shooting location in step S2. Further, if the half-pressing operation of the release SW 32 is not confirmed for a predetermined time, this flowchart may be ended.

  The camera body CPU 27 sets shooting conditions (step S8). As described above, when it is determined in step S1 that the photographing lens 3 is a macro lens and the current photographing location is an aquarium in step S2, the camera body CPU 27 performs photographing for macro photographing in the aquarium. Set the conditions. For example, since flash photography is prohibited in an aquarium, the camera body CPU 27 prohibits flash photography, sets the ISO sensitivity between 800 and 1600, and sets a white balance for photographing organisms in the water. For underwater use (specify blue band correction to underwater). In addition, since the aquarium is generally dark, the camera body CPU 27 sets the aperture in the vicinity of the full open and performs the AF operation using the output of the focus detection sensor 11 in order to perform AF by the phase difference method. In addition to this, the camera main body CPU 27 sets a continuous AF mode in which AF is continuously executed because shooting of moving objects is expected.

  In addition, when the user selects moving image shooting, the camera body CPU 27 does not perform aperture control because the attached shooting lens 3 is a macro lens.

  Furthermore, the camera main body CPU 27 performs active D lighting in the case of a backlight state (a state in which the user is surrounded by a water tank) from the output of the photometric sensor 15. Active D lighting changes the exposure value calculated from the output of the photometric sensor 15 and performs gradation correction on the obtained image.

  Next, the camera body CPU 27 performs focus detection by the focus detection sensor 11 and drives it according to the focus detection result of the focus lens constituting the photographing lens 3, and detects the position of the focus lens by an encoder (not shown) (step). S9).

  Furthermore, the camera main body CPU 27 determines whether or not aberration has occurred due to the shooting location based on the information of the shooting location acquired in step S2 (step S10). In the present embodiment, since the shooting location is an aquarium, there is a possibility that the curvature of the glass constituting the aquarium and aberration due to the water in the aquarium may occur. For this reason, the camera body CPU 27 determines that an aberration occurs in step S10, and proceeds to step S11. If the camera body CPU 27 determines that there is no aberration due to the shooting location, the process proceeds to step S13.

  Further, the camera body CPU 27 detects whether or not the subject has a face by using the image signal subjected to the image processing by the image processing control circuit 25 by the face detection unit 33 (step S11). This is because even in an aquarium, people may become the main subject and the aquarium may become the background.In such a case, it is necessary to correct the curvature of the glass constituting the aquarium and the aberration generated by the water in the aquarium. Because there is no. On the other hand, if a face is not detected, there is a high possibility that an organism in the aquarium will be photographed, and it will be necessary to correct the curvature of the glass constituting the aquarium and the aberration generated by the water in the aquarium. Therefore, the camera body CPU 27 proceeds to step S13 when a face is detected by the face detection unit 33, and proceeds to step S12 when a face is not detected by the face detection unit 33.

  The camera body CPU 27 corrects the curvature of the glass constituting the water tank and the aberration generated by the water in the water tank (step S12). The camera body CPU 27 stores an aberration table stored in a nonvolatile memory (not shown) of the photographing lens 3, a driving amount stored in a nonvolatile memory (not shown) of the aberration correction converter 40, and a negative lens of the aberration correction converter 40. The positions of the L1 and the positive lens L2 are confirmed, and the positive lens L2 and the photographing lens 3 are moved by moving the negative lens L1 and the positive lens L2 along the optical axis according to the position of the focus lens acquired in step S9. The air gap from the object side lens is adjusted, thereby correcting distortion and curvature of field. Note that distortion and lateral chromatic aberration can be corrected by image processing.

  When aberration correction is performed in step S12, the camera body CPU 27 does not grasp the material and thickness of the glass. For this reason, in the present embodiment, the camera body CPU 27 performs aberration correction using an intermediate drive amount from among a plurality of drive amounts stored in the drive table. As will be described later, since the degree of occurrence of chromatic aberration of magnification is known from an image, the camera body CPU 27 recognizes the degree of chromatic aberration of magnification from an image using an intermediate driving amount, and is a transparent member such as glass. The drive amount stored in the non-volatile memory (not shown) of the aberration correction converter 40 can be read from the analog material and thickness of the transparent member, and the aberration correction can be performed again. .

  Next, the camera body CPU 27 detects the chromatic aberration of magnification by detecting the color blur of the image as the image contrast by using the image processing control circuit 25 to which the image signal captured by the image sensor 9 is input (step S13). That is, the camera body CPU 27 also operates as an aberration detection unit that detects information related to aberrations from an image captured by the imaging unit. Then, the camera body CPU 27 estimates the material and thickness of the transparent member as described above based on the detected lateral chromatic aberration, and finely adjusts the positions of the negative lens L1 and the positive lens L2 of the aberration correction converter 40 again. (Step S14). Further, the camera body CPU 27 acquires an image after finely adjusting the positions of the negative lens L1 and the positive lens L2 of the aberration correction converter 40 using the image processing control circuit 25, and image contrast before and after the adjustment (magnification chromatic aberration). Are compared to confirm whether the chromatic aberration of magnification has improved to a predetermined value or less (step S16). The camera body CPU 27 proceeds to step S17 when determining that the chromatic aberration of magnification has become a predetermined value or less, and repeats steps S14 to S16 when the chromatic aberration of magnification is greater than the predetermined value. Thus, the camera body CPU 27 also operates as a control unit that corrects the aberration of the imaging optical system SL by controlling the operation of the aberration correction converter 40 that is an aberration correction unit.

  Next, the camera main body CPU 27 determines whether or not the release SW 32 is fully pressed (step S17), and performs shooting when it is fully pressed (step S18). The camera body CPU 27 repeats step S17 when the release SW 32 is not fully pressed, but may end this flowchart when the release SW 32 is not fully pressed for a predetermined time.

  When the shooting execution in step S18 ends, the camera body CPU 27 determines whether or not shooting has been performed with the aberration correction converter 40 not attached (step S19). If the lens is not mounted, the magnification chromatic aberration amount is calculated from the image, the image is corrected according to the aberration amount, and this flowchart is ended.

  If the shooting in step S18 is moving image shooting, the camera body CPU 27 detects a change in the position of the focus lens, calculates the lateral chromatic aberration by the method described above when the position changes, and calculates the R, The magnification chromatic aberration can be corrected as image processing for each of the G and B signals.

  The correction of distortion and curvature of field shown in step S12 and the correction of chromatic aberration of magnification shown in step S14 include the aberration information of the photographing lens 3 when the aberration correction converter 40 is attached, for example, flash. It is possible to store in the ROM 29 and obtain the aberration amount from the aberration information and the position of the focus lens.

  Further, when the camera system 1 having the photographing lens 3 is attached to the dome port by disposing the above-described aberration correction converter 40 in the vicinity of the dome port window for underwater photography, the image is taken through the dome port window. Can be corrected.

  In the above description, it is assumed that the aquarium is photographed from the information acquisition result of the photographing location in step S2. However, if it is understood from the output of the water pressure gauge 34 that the subject is underwater, the photographing in the water is performed after step S3. It is also possible to proceed with the process.

  In the above description, the camera system 1 that is a lens interchangeable single-lens reflex camera has been described as an example. I can.

  The optical performance when the aberration correction converter 40 is attached to the imaging lens 3 as described above will be described below. FIG. 6 illustrates an acrylic water tank window (hereinafter simply referred to as “window W”) using the imaging optical system SL (4) constituting the imaging lens 3 and the aberration correction optical system CL constituting the aberration correction converter 40. ) Is used to photograph an underwater subject (an object not shown). As shown in FIG. 6, the window W, the aberration correction optical system CL, and the imaging optical system SL are arranged in order from the object side. In addition, the aberration correction optical system CL includes, in order from the object side, a negative meniscus lens L1 having a convex surface facing the object side, and a positive meniscus lens L2 having a convex surface facing the object side. The imaging optical system SL includes, in order from the object side, a positive meniscus lens L11 having a convex surface facing the object side, a positive meniscus lens L12 having a convex surface facing the object side, a negative meniscus lens L13 having a convex surface facing the object side, and an aperture. The aperture stop S includes a cemented lens of a negative meniscus lens L14 having a concave surface facing the object side and a positive meniscus lens L15 having a concave surface facing the object side, and a biconvex lens L16. Note that focusing from an infinite object point to a short-distance object point is performed by moving the entire imaging optical system SL to the object side.

  The aberration correction optical system CL of the aberration correction converter 40 having such a configuration moves on the optical axis, and is the most image side lens surface (sixth surface) and the most object side lens surface (first surface) of the imaging optical system SL. By changing the distance d6 on the optical axis with respect to the seventh surface), the chromatic aberration of magnification and distortion of the image formed on the image plane I by the imaging optical system SL are corrected. When the aberration correction optical system CL moves on the optical axis, the image side surface (second surface) of the window W of the acrylic water tank and the lens surface (third surface) closest to the object side of the aberration correction optical system CL. The distance d2 on the optical axis also changes.

  Table 1 below lists the values of specifications of the aberration correction optical system CL and the imaging optical system SL when focusing on infinity. In Table 1, the first column m indicates the order (surface number) of the lens surfaces from the object side along the traveling direction of the light beam, the second column r indicates the curvature radius of each lens surface, and the third column. d is the distance (surface distance) on the optical axis from each optical surface to the next optical surface. The fourth column νd and the fifth column nd are the Abbe number and refractive index for the d-line (λ = 587.6 nm). Is shown. Here, the radius of curvature r, surface spacing d, and other length units listed in all the following specifications are generally “mm”, but the optical system may be proportionally enlarged or reduced. Since equivalent optical performance can be obtained, the present invention is not limited to this. A radius of curvature of 0.00 indicates a plane in the case of a lens surface, and an aperture in the case of a stop. Further, the refractive index of air of 1.0000 is omitted. Further, it is assumed that the object side (first surface side) of the window W is filled with water having an Abbe number of 53.98 and a refractive index of 1.333060. The surface numbers 1 to 18 correspond to the numbers 1 to 18 shown in FIG.

(Table 1)
m r d νd nd
1 0.0000 30.00 57.57 1.491080
2 0.0000 d2
3 6200.0000 3.00 29.37 1.950000
4 560.0000 1.00
5 266.1762 6.00 82.57 1.497820
6 1508.9513 d6
7 50.5480 3.50 46.76 1.766840
8 1728.4000 0.10
9 19.9960 4.15 45.42 1.796680
10 34.3520 1.30
11 69.6150 1.00 29.48 1.717360
12 16.1130 6.00
13 0.0000 5.45
14 -16.7700 1.00 33.77 1.648310
15 -218.5620 4.95 46.76 1.766840
16 -20.8720 0.10
17 392.1120 2.85 53.97 1.713000
18 -53.8430

  FIGS. 7 to 10 are graphs showing various aberrations of spherical aberration, astigmatism, distortion aberration, lateral chromatic aberration, and coma aberration when the above-described optical system is focused at infinity and at close distance. 7 shows various aberrations when an object in the air is photographed only by the imaging optical system SL, and FIG. 8 shows various aberrations when an object in the water is photographed through the window W only by the imaging optical system SL. FIG. 9 shows various aberrations when an object in the air is photographed by the imaging optical system SL equipped with the aberration correction optical system CL, and FIG. 10 shows the imaging optical system SL equipped with the aberration correction optical system CL. Shows various aberrations when shooting an underwater object. At this time, the distance on the optical axis between the most object-side lens surface (seventh surface) of the photographing optical system SL and the image-side surface (second surface) of the window W is 121.00 mm, and the aberration correction optical system CL is When shooting in the air, d6 is placed at a position of 11.00 mm (d2 is 100.00 mm), and when shooting underwater, d6 is placed at a position of 81.00 mm (d2 is 30.00 mm). Show. When focusing on a short-distance object point, the imaging optical system SL moves 7.78642 mm along the optical axis toward the object side.

  In each aberration diagram, FNO is the F number, NA is the numerical aperture, Y is the image height, d is the d-line (λ = 587.6 nm), g is the g-line (λ = 435.8 nm), and C is C The line (λ = 656.3 nm) and F the F line (λ = 486.1 nm), respectively. In the aberration diagrams showing astigmatism, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane.

  As is apparent from the above aberration diagrams, when an underwater object is photographed by the photographing optical system SL according to the present embodiment, various aberrations (particularly distortion aberration and lateral chromatic aberration) are larger than those in the air. By mounting the aberration correction converter 40 (aberration correction optical system CL), these aberrations are corrected and good optical performance can be obtained.

1 Camera System (Imaging Device) 9 Image Sensor (Imaging Unit)
16 GPS module (position detector)
27 Camera body CPU (control unit, aberration detection unit, shooting location detection unit)
40 Aberration correction converter (aberration correction unit)
SL Photography optical system CL Aberration correction optical system

Claims (5)

An imaging unit that performs imaging using an imaging optical system;
An aberration correction unit for correcting the aberration of the imaging optical system;
A face detection unit that determines whether an image corresponding to a face is included in the image captured by the imaging unit;
A control unit that corrects the aberration of the imaging optical system by the aberration correction unit when the face detection unit determines that the image corresponding to the face is not included in the image;
An aberration detector that detects information about aberration from the image captured by the imaging unit;
I have a,
The control unit corrects the aberration of the imaging optical system based on the detection result of the face detection unit, and then, based on the information on the aberration detected by the aberration detection unit, the aberration correction unit performs the correction of the imaging optical system. An image pickup apparatus that corrects aberrations . The imaging optical system has a focus lens for adjusting the focus of the imaging optical system,
The imaging apparatus according to claim 1, wherein the control unit corrects the aberration of the imaging optical system by controlling the aberration correction unit based on a position of the focus lens. A shooting location detection unit for detecting information on a shooting location where shooting is performed by the imaging unit;
On the basis of the shooting location detector the shooting location information regarding detected by imaging apparatus according to claim 1 or 2, characterized in that it has a setting unit for setting an imaging condition for the imaging unit. The imaging device according to claim 3 , wherein the photographing location detection unit includes a water pressure gauge. The aberration correcting unit, an imaging apparatus according to any one of claims 1 to 4, characterized in that said an aberration correction optical system that is attachable to the imaging optical system.

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