JP2012199834A - Imaging apparatus, imaging method, and imaging program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus, an imaging method, and an imaging program which even in photographing while inclining the optical axis of a photographic lens, are capable of reducing problems caused by the influence of aberration in the photographic lens.SOLUTION: The imaging apparatus is provided with: a display part 210 which displays an image corresponding to image data generated by an imaging part 201; a tilt detection part 304 which detects a displacement magnitude from a reference position which is a position where the optical axis of an optical system 301 is orthogonal to the light-receiving surface of the imaging part 201; an area calculation part 215d which calculates on the basis of the detection result of the tilt detection part 304, an incident area on the light-receiving surface of the imaging part 201 including an area from a position where the optical axis of the optical system 301 crosses the light-receiving surface of the imaging part 201 to the vicinity of the position; and a display control part 215h which controls the display part 210 to display an area within an image corresponding to the incident area calculated by the calculation part 215d, by visual information identifiable within the image.

Description

  The present invention relates to an imaging apparatus, an imaging method, and an imaging program for imaging a subject and generating electronic image data.

  Conventionally, there is a known tilt lens that can emphasize the blur around the subject by tilting the photographic lens with respect to the light-receiving surface of the image sensor (tilting operation) and tilting the focus area that focuses on the main subject. It has been. There is also known a tilt lens capable of causing radial blurring in a peripheral image of a main subject by deliberately reducing optical performance other than the vicinity of the optical axis of the photographing lens.

30 to 32 are schematic diagrams for explaining a state when a conventional photographing lens is tilted. As shown in FIG. 30, when the optical axis of the photographic lens 1002 is orthogonal to the light receiving surface of the imaging unit 1001, the in-focus area Z1 (indicated by hatching) where the photographic lens 1002 is focused is near a certain distance (for example, distance d _10). )become. For this reason, the subject M1 (plane) near the fixed distance from the photographing lens 1002 forms an image in a focused state on the light receiving surface of the imaging unit 1001, while being closer to the subject M2 and the subject M1 farther than the subject M1. Since the subject M3 at a distance is out of the focusing area Z1, the subject M3 is imaged in a blurred state on the light receiving surface of the imaging unit 1001.

As shown in FIG. 31, when the upper surface of the photographing lens 1001 is tilted so that the upper surface of the photographing lens 1001 approaches the subject M1 (tilt angle = θ ₁ ), the focusing area Z1 in which the photographing lens 1001 is focused is tilted and deformed. For this reason, the subject M2 farther than the subject M1 and the subject M3 closer to the subject M1 are imaged while being focused on the light receiving surface of the imaging unit 1001.

On the other hand, as shown in FIG. 32, when the upper surface of the imaging lens 1001 is tilted backward (tilt angle = θ ₂ ) so as to move away from the subject M1, the focusing area Z1 where the photographing lens 1001 is in focus is obtained. On the contrary, it tilts and deforms. For this reason, the subject M2 and the subject M3 are imaged in a state where the blur is emphasized on the light receiving surface of the imaging unit 1001 by being out of the focusing area Z1.

  In a photographing apparatus equipped with such a photographing lens, a technique is known that allows photographing while adjusting blur and focus of a subject by using a mount adapter that can tilt the optical axis of the photographing lens (for example, , See Patent Document 1).

JP 2001-194700 A

  However, in the conventional technique described above, when photographing with the optical axis of the photographing lens tilted, various problems have occurred due to the influence of aberration in the photographing lens. For example, when the user looks at the displayed image, there is a problem that color misregistration occurs in the image corresponding to the in-focus area.

  The present invention has been made in view of the above, and an imaging apparatus capable of reducing problems caused by the influence of aberrations in a photographing lens, even when photographing with the optical axis of the photographing lens tilted, An object is to provide an imaging method and an imaging program.

  In order to solve the above-described problems and achieve the object, an imaging apparatus according to the present invention receives an optical system having a lens group including one or a plurality of lenses and light collected by the optical system. An imaging unit that generates electronic image data by performing photoelectric conversion, and capable of displacing the optical axis of the optical system, corresponding to the image data generated by the imaging unit A display unit that displays an image to be detected, a displacement amount detection unit that detects a displacement amount from the reference position with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position, and a displacement amount detection unit Based on a detection result, an area calculation unit that calculates an incident area of a light beam on the light receiving surface including from the position where the optical axis intersects the light receiving surface to the vicinity of the position, and the incidence calculated by the area calculation unit Corresponds to the region The area within the image, characterized by comprising a display control unit for displaying on the display unit in identifiable visual information within the image.

  In the imaging device according to the present invention as set forth in the invention described above, the visual information is a variable constituting a color space.

  The imaging apparatus according to the present invention is characterized in that, in the above invention, the variable constituting the color space is any one of a primary color system specific component, a complementary color system specific component, hue, saturation, and brightness. To do.

  In the imaging device according to the present invention as set forth in the invention described above, the visual information is a rectangular frame.

  The imaging apparatus according to the present invention further includes an input unit that receives an input of an instruction signal instructing the change of the visual information performed by the display control unit in the above-described invention, and the display control unit is controlled by the input unit. The visual information is changed according to the input instruction signal.

  In the imaging device according to the present invention, in the above invention, the imaging device can set a manual mode for manually adjusting the focus of the imaging unit and an autofocus mode for automatically adjusting the focus of the imaging unit. And the input unit includes a shooting mode changeover switch that receives an input of an instruction signal for setting the manual mode or the autofocus mode to the imaging device, and the display control unit is configured to switch the imaging device to the manual mode. When set, the image area corresponding to the incident area is displayed on the display unit with visual information identifiable in the image, while the imaging apparatus is set to the autofocus mode, A region corresponding to the incident region is displayed on the display unit with a rectangular frame.

  In addition, an imaging apparatus according to the present invention receives an optical system having a lens group including one or a plurality of lenses and receives light collected by the optical system and performs photoelectric conversion to obtain electronic image data. An imaging device that generates the imaging system and is capable of displacing the optical axis of the optical system, wherein the optical axis is perpendicular to the light receiving surface of the imaging unit, and the reference position is used as a reference position. Based on the detection result of the displacement amount detection unit, the incident amount of the light beam on the light receiving surface including the position where the optical axis intersects the light receiving surface and the vicinity thereof An area calculation unit that calculates an area, and a color correction processing unit that corrects a color shift in the incident area calculated by the area calculation unit.

  In the imaging device according to the present invention, in the above invention, the color correction processing unit corresponds to the color of each pixel of the light receiving surface in the incident area according to the displacement detected by the displacement detection unit. Correction is performed to move the image to be moved in the direction in which the optical axis is displaced.

  The image pickup apparatus according to the present invention is characterized in that, in the above invention, the color correction processing unit increases the intensity of correcting the color shift in the incident area as compared with other areas in the light receiving surface.

  The imaging apparatus according to the present invention further includes a lens information storage unit that stores lens characteristic information indicating the characteristics of the optical system in the above invention, and the color correction processing unit refers to the lens characteristic information. The color shift is corrected.

  In the imaging device according to the present invention, in the above invention, the incident area calculated by the area calculation unit is set as a focusing area, and the imaging area is different from the direction toward the center of the light receiving surface in the focusing area. The image processing apparatus further includes a focus control unit that adjusts the focus of the optical system based on contrast or phase difference.

  The imaging apparatus according to the present invention may further include a lens driving unit that moves the lens group along the optical axis in the above invention, and the focus control unit is configured so that the contrast is maximized. The driving unit is driven.

  Moreover, the imaging apparatus according to the present invention is characterized in that, in the above invention, the focus control unit adjusts the focus of the optical system based on a contrast corresponding to a predetermined color on a light receiving surface of the imaging unit. To do.

  The imaging apparatus according to the present invention is characterized in that, in the above invention, the optical system is detachable from the imaging apparatus.

  In addition, an imaging method according to the present invention includes an optical system having a lens group composed of one or a plurality of lenses, and receives light collected by the optical system and performs photoelectric conversion to obtain electronic image data. A display step of displaying an image corresponding to the image data generated by the imaging unit, the imaging method comprising: an imaging unit that generates the imaging unit and capable of displacing an optical axis of the optical system; A displacement amount detecting step of detecting a displacement amount from the reference position with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position, and the light based on a detection result of the displacement amount detecting step. A region calculating step of calculating a light incident region on the light receiving surface including a position where an axis intersects the light receiving surface and the vicinity of the position; and a region in the image corresponding to the incident region calculated by the region calculating step. Frequency and characterized in that it comprises a display control step of displaying on the display unit in identifiable visual information within the image.

  In addition, an imaging method according to the present invention includes an optical system having a lens group composed of one or a plurality of lenses, and receives light collected by the optical system and performs photoelectric conversion to obtain electronic image data. An imaging method performed by an imaging device capable of displacing the optical axis of the optical system, wherein the position where the optical axis is orthogonal to the light receiving surface of the imaging unit is a reference position. A displacement amount detecting step for detecting a displacement amount from the reference position; and on the light receiving surface including a position from the position where the optical axis intersects the light receiving surface to the vicinity thereof based on a detection result of the displacement amount detecting step. A region calculating step for calculating the incident region of the light beam in the light source, and a color correction processing unit for correcting a color shift in the region of the light receiving surface corresponding to the incident region calculated by the region calculating step. .

  Further, in the imaging method according to the present invention, in the above invention, the incident area calculated by the area calculation step is set as a focusing area, and a direction different from a direction toward the center of the light receiving surface is in the focusing area. The method further includes a focus control step of adjusting the focus of the optical system based on contrast or phase difference.

  In addition, an imaging program according to the present invention receives an optical system having a lens group composed of one or a plurality of lenses and receives light collected by the optical system and performs photoelectric conversion to obtain electronic image data. A display step of displaying an image corresponding to the image data generated by the imaging unit, the imaging program being executed by an imaging apparatus capable of displacing an optical axis of the optical system. And a displacement amount detecting step for detecting a displacement amount from the reference position with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position, and based on a detection result of the displacement amount detecting step, An area calculating step for calculating an incident area of a light beam on the light receiving surface including from a position where an optical axis intersects the light receiving surface to the vicinity of the position, and the area calculating step calculates Wherein the area in the image corresponding to the incident area, characterized in that to execute a display control step of displaying on the display unit in identifiable visual information within the image.

  In addition, an imaging program according to the present invention receives an optical system having a lens group composed of one or a plurality of lenses and receives light collected by the optical system and performs photoelectric conversion to obtain electronic image data. An imaging program that is executed by an imaging apparatus capable of displacing the optical axis of the optical system, wherein the position where the optical axis is orthogonal to the light receiving surface of the imaging unit is a reference position A displacement amount detecting step for detecting a displacement amount from the reference position, and the light receiving surface including from the position where the optical axis intersects the light receiving surface to the vicinity thereof based on the detection result of the displacement amount detecting step An area calculating step for calculating an incident area of the light beam on the upper side, and a color correction process for correcting a color shift in the area of the light receiving surface corresponding to the incident area calculated by the area calculating step. Characterized in that to execute a part, a.

  In the imaging program according to the present invention, in the above invention, the incident area calculated by the area calculation step is set as a focusing area, and the direction of the imaging area is different from the direction toward the center of the light receiving surface in the focusing area. A focus control step of adjusting the focus of the optical system based on contrast or phase difference is further executed.

  According to the present invention, from the position where the optical axis of the optical system intersects the light receiving surface of the imaging unit to the vicinity of this position based on the amount of displacement of the optical axis of the optical system detected by the tilt detection unit by the region calculation unit. The incident area of the light beam on the light receiving surface of the image capturing section is calculated, and the display control section and the color correction processing section perform predetermined processing on the incident area. As a result, even when photographing with the optical axis of the optical system tilted, there is an effect that problems caused by the influence of aberration in the optical system can be reduced.

FIG. 1 is a perspective view illustrating a configuration of a side facing a subject of the imaging apparatus according to the first embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the side (back side) facing the photographer of the imaging apparatus according to the first embodiment of the present invention. FIG. 3 is a block diagram illustrating a configuration of the imaging apparatus according to the first embodiment of the present invention. FIG. 4 is a diagram illustrating an example of aberration information of the lens unit stored in the aberration information storage unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 5 is a diagram illustrating another example of aberration information of the lens unit stored in the aberration information storage unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 6 is a cross-sectional view schematically illustrating a configuration of a main part of the lens unit in the imaging apparatus according to the first embodiment of the present invention. FIG. 7 is a diagram schematically illustrating a method of operating the lens unit in the imaging apparatus according to the first embodiment of the present invention. FIG. 8 is a diagram schematically illustrating an outline of a lens unit that operates by the operation illustrated in FIG. FIG. 9 is a diagram schematically illustrating a change in aberration caused by a change in the optical axis of the lens unit with respect to a direction perpendicular to the light receiving surface of the imaging unit in the imaging apparatus according to the first embodiment of the present invention. It is. FIG. 10 schematically illustrates an example (first example) of aberration caused by the displacement of the optical axis of the lens unit with respect to the direction orthogonal to the light receiving surface of the imaging unit in the imaging apparatus according to the first embodiment of the present invention. FIG. FIG. 11 schematically illustrates an example of aberration (second example) caused by the displacement of the optical axis of the lens unit with respect to the direction orthogonal to the light receiving surface of the imaging unit in the imaging apparatus according to the first embodiment of the present invention. FIG. FIG. 12 schematically illustrates an example of aberration (third example) caused by the change of the optical axis of the lens unit with respect to the direction orthogonal to the light receiving surface of the imaging unit in the imaging apparatus according to the first embodiment of the present invention. FIG. FIG. 13 is a diagram illustrating an example of an image generated by the imaging apparatus according to the first embodiment of the present invention. FIG. 14 is a flowchart illustrating an outline of processing performed by the imaging apparatus according to the first embodiment of the present invention. FIG. 15 is a flowchart showing an overview of the tilt lens display correction process shown in FIG. FIG. 16 is a diagram illustrating an example of an image displayed by the display unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 17 is a diagram schematically illustrating the state of a point image due to axial chromatic aberration of the optical system in the lens unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 18 is a perspective view for schematically explaining the state of a point image due to axial chromatic aberration of the optical system in the situation shown in FIG. FIG. 19 is a diagram schematically illustrating an outline of a color misregistration correction process performed by the color correction processing unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 20 is a diagram illustrating an example of an image displayed by the display unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 21 is a diagram for explaining the outline of the AF process performed by the AF control unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 22 is a diagram illustrating an example of an image displayed by the display unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 23 is a flowchart showing an outline of the tilt lens display correction process according to the second embodiment of the present invention. FIG. 24 is a diagram schematically illustrating an outline of a color misregistration correction process performed by the color correction processing unit of the imaging apparatus according to the second embodiment of the present invention. FIG. 25 is a diagram illustrating an example of an image displayed by the display unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 26 is a diagram illustrating an example of an image displayed by the display unit of the imaging apparatus according to the first embodiment of the present invention. FIG. 27 is a diagram illustrating a main part of another configuration example of the lens unit. FIG. 28 is a diagram schematically illustrating the operation of the lens unit. FIG. 29 is a perspective view showing the configuration of the imaging unit equipped with another embodiment of the lens unit on the side facing the subject. FIG. 30 is a schematic diagram for explaining a state when a conventional photographing lens is tilted. FIG. 31 is a schematic diagram for explaining a state when a conventional photographing lens is tilted. FIG. 32 is a schematic diagram for explaining a state when a conventional photographing lens is tilted.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the drawings. The present invention is not limited to the embodiments described below.

(Embodiment 1)
FIG. 1 is a perspective view illustrating a configuration of a side (front side) facing an object of the imaging apparatus according to the first embodiment. FIG. 2 is a perspective view illustrating a configuration (back side) facing the photographer of the imaging apparatus according to the first embodiment. FIG. 3 is a block diagram illustrating a configuration of the imaging apparatus according to the first embodiment. An imaging apparatus 1 illustrated in FIGS. 1 to 3 is a digital single-lens reflex camera, and includes a main body unit 2 and a lens unit 3 that can be attached to and detached from the main body unit 2. The imaging apparatus 1 can also be equipped with an accessory 4 such as an electronic viewfinder (EVF), an electronic flash, and a communication unit that performs communication via the Internet.

  As shown in FIGS. 1 to 3, the main body 2 includes an imaging unit 201, an imaging drive unit 202, a signal processing unit 203, a flash light emitting unit 204, an attitude detection unit 205, a timer 206, and a first The communication unit 207, the second communication unit 208, the operation input unit 209, the display unit 210, the touch panel 211, the storage unit 212, the power supply unit 213, the power supply unit 214, and the control unit 215 are provided. .

  The imaging unit 201 is configured using an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) that receives the light collected by the lens unit 3 and converts it into an electrical signal, and a shutter. . In the imaging unit 201, a Bayer array color filter (primary color filter) is disposed in front of a photodiode that constitutes each pixel of the imaging element. The Bayer array includes a line in which a filter that transmits red (R) wavelength and a filter that transmits green (G) are alternately arranged in a horizontal direction, a filter that transmits green wavelength, and blue (B ), And filters that transmit the wavelength (1) are alternately arranged, and the two lines are also arranged alternately in the vertical direction. The color filter may be a complementary color filter using four colors of cyan (Cy), magenta (Mg), yellow (Ye), and green.

  The imaging drive unit 202 has a function of driving the imaging device and the shutter according to the release signal. For example, the imaging drive unit 202 causes the signal processing unit 203 to output image data (analog signal) from the imaging device at a predetermined timing.

  The signal processing unit 203 performs signal processing such as amplification on the analog signal output from the imaging unit 201 and then performs A / D conversion to generate and output digital image data.

  The flash light emitting unit 204 is configured using a xenon lamp, an LED (Light Emitting Diode), or the like. The flash light emitting unit 204 irradiates auxiliary light (strobe light) toward the visual field area imaged by the imaging device 1.

  The posture detection unit 205 is configured using an acceleration sensor. The posture detection unit 205 detects the posture state of the imaging device 1 by detecting the acceleration of the imaging device 1. Specifically, the posture detection unit 205 detects the posture (tilt angle) of the imaging device 1 with respect to the horizontal plane.

  The timer 206 has a timekeeping function and a shooting date / time determination function. The timer 206 outputs the date / time data to the control unit 215 in order to add the date / time data to the captured image data.

  The first communication unit 207 is a communication interface for performing communication with the lens unit 3 attached to the main body unit 2. The second communication unit 208 is a communication interface for performing communication with the accessory communication unit 401 of the accessory 4 attached to the main body unit 2.

  As shown in FIGS. 1 and 2, the operation input unit 209 includes a power switch 209 a that switches the power state of the imaging apparatus 1 to an on state or an off state, a release switch 209 b that inputs an instruction signal that gives a shooting instruction, A shooting mode changeover switch 209c that inputs a switching signal that gives instructions for switching various shooting modes set in the imaging apparatus 1, and an operation switch 209d that inputs an instruction signal that gives instructions for selecting or determining various settings of the imaging apparatus 1. A menu switch 209e for inputting an instruction signal for giving an instruction to display the operation menu screen set in the imaging apparatus 1, and a display changeover switch 209f for instructing a change in the display mode of the image displayed on the display unit 210. . The release switch 209b can be moved forward and backward by pressing from the outside, and receives a first release signal for instructing an imaging preparation operation when half-pressed, and a second for instructing still image imaging when fully pressed. Accept release input. In the following description, a surface on which the power switch 209a and the like are provided in FIG. 1 is referred to as an upper surface, and a direction perpendicular to the surface is referred to as an up-down direction. A direction parallel to the upper surface and perpendicular to the vertical direction is referred to as a horizontal direction.

  The display unit 210 is realized using a display panel made of liquid crystal, organic EL (Electro Luminescence), or the like. In addition to image data, the display unit 210 appropriately displays operation information of the imaging apparatus 1 and information related to shooting.

  The touch panel 211 is provided on the display screen of the display unit 210. The touch panel 211 detects a position touched by the user based on information displayed on the display unit 210 and receives an input of an operation signal corresponding to the detected touch position. In general, the touch panel includes a resistance film method, a capacitance method, an optical method, and the like. In the first embodiment, any type of touch panel is applicable.

  The storage unit 212 is realized using a semiconductor memory such as a flash memory or a DRAM (Dynamic Random Access Memory) that is fixedly provided inside the imaging apparatus 1. The storage unit 212 stores various programs for operating the imaging apparatus 1, the imaging program according to the first embodiment, and various data and parameters used during the execution of the above-described program. The storage unit 212 stores image data and information such as information on the lens unit 3 that can be attached to the main body unit 2 and information on correction of image data according to the type of the lens unit 3. Note that the storage unit 212 may include a computer-readable storage medium such as a memory card mounted from the outside.

  The power supply unit 213 is configured using a battery that is detachably attached to the imaging apparatus 1. The power supply unit 214 supplies power from the power supply unit 213 to each component of the imaging apparatus 1 (including the lens unit 3 and the accessory 4 to be mounted). The power supply unit 214 may supply power supplied from an external power source (not shown) to each component of the imaging device 1.

  The control unit 215 is configured using a CPU (Central Processing Unit) or the like. The control unit 215 controls the operation of the imaging apparatus 1 by performing instructions and data transfer corresponding to the respective units constituting the imaging apparatus 1 in accordance with instruction signals, switching signals, and the like from the operation input unit 209 and the touch panel 211. To control.

  A detailed configuration of the control unit 215 will be described. The control unit 215 includes an image processing unit 215a, a face detection unit 215b, a state determination unit 215c, an area calculation unit 215d, a color correction processing unit 215e, an AF control unit (focus control unit) 215f, and an imaging control unit. 215g and a display control unit 215h.

  The image processing unit 215a performs various types of image processing on the image data input from the signal processing unit 203. Specifically, the image processing unit 215a performs image processing including at least edge enhancement, white balance, and γ correction on the image data. Note that the image processing unit 215a may perform compression processing for compressing image data by a predetermined method, for example, the JEPG method.

  The face detection unit 215b detects a human face included in the image corresponding to the image data by pattern matching. Note that the face detection unit 215b may detect not only a person's face but also a face such as a dog or a cat. Furthermore, the face detection unit 215b may detect a human face using a known technique other than pattern matching.

  The state determination unit 215 c determines the state of the lens unit 3 based on information regarding the state of the lens unit 3 input from the first communication unit 207.

  Based on the information regarding the state of the lens unit 3 input from the first communication unit 207, the region calculation unit 215d includes from the position where the optical axis of the lens unit 3 intersects the light receiving surface of the imaging unit 201 to the vicinity of this position. The incident area is calculated.

  The color correction processing unit 215e corrects color misregistration in a region in the image corresponding to the incident region calculated by the region calculation unit 215d. Specifically, the color correction processing unit 215e displays an image corresponding to the color of each pixel on the light receiving surface in the incident area based on the information regarding the state of the lens unit 3 input from the first communication unit 207. Correction is performed to move (slide) the optical axis 3 in the direction in which the optical axis 3 is displaced (tilt amount and shift amount). In addition, the color correction processing unit 215e converts any one or more of the images corresponding to the color of each pixel on the light receiving surface in the incident region, for example, a red image or a blue image, with the optical axis of the lens unit 3 being displaced. Make corrections to move in the direction of movement. Further, the color correction processing unit 215e increases the intensity of correcting the color shift in the incident region as compared with other regions of the light receiving surface of the imaging unit 201.

  The AF control unit 215f adjusts the focus of the lens unit 3 so that the lens unit 3 is in focus when the first release signal is input from the release switch 209b. The AF control unit 215f sets the incident area calculated by the area calculation unit 215d as a focusing area (focusing area), and has a contrast in a direction different from the direction toward the center of the light receiving surface of the imaging unit 2 in the focusing area. The focus of the lens unit 3 is adjusted based on the phase difference. Specifically, the AF control unit 215f sets the lens at a position where the contrast of the image corresponding to the in-focus area becomes maximum or a position where the sharpness of the image corresponding to the in-focus area becomes maximum. Adjust the focus of part 3.

  When the second release signal is input from the release switch 209b, the shooting control unit 215g performs control to start the shooting operation in the imaging device 1. Here, the photographing operation in the imaging apparatus 1 refers to an operation in which the signal processing unit 203 and the image processing unit 215a perform predetermined processing on the image data output from the imaging unit 201 by driving the imaging driving unit 202. The image data processed in this way is stored in the storage unit 212 by the control unit 215. In addition, the imaging control unit 215g performs control to start the imaging operation in the imaging device 1 according to the determination result of the state determination unit 215c.

  When the instruction signal is input from the menu switch 209e, the display control unit 215h displays the operation menu screen on the display unit 210. The display control unit 215h causes the display unit 210 to display a region in the image corresponding to the incident region calculated by the region calculation unit 215d with visual information that can be identified in the image displayed by the display unit 210. This visual information is a variable constituting the color space. Specifically, the variable constituting the color space may be any one of a primary color system specific component, a complementary color system specific component, hue, saturation, and brightness. For example, the variable constituting the color space may be a color corresponding to each pixel of the imaging unit 201, for example, any single color of green, red, or blue. The display control unit 215h may display a region in the image corresponding to the incident region in a mixed color (for example, orange) in the image displayed by the display unit 210.

  The main body 2 having the above configuration may be provided with a voice input / output function, a communication function for performing communication via the Internet, and the like.

  Next, a detailed configuration of the lens unit 3 will be described. The lens unit 3 is a tilt lens (tilt lens) that can swing in all directions with reference to a direction in which the optical axis of the optical system 301 is orthogonal to the light receiving surface of the imaging unit 201.

  The lens unit 3 includes an optical system 301, a lens driving unit 302, a position detection unit 303, an inclination detection unit 304, an aperture driving unit 305, a lens operation unit 306, a lens communication unit 307, and a lens storage unit 308. And a lens control unit 309.

  The optical system 301 includes a lens group 301a including one or a plurality of lenses, a focus mechanism 301b that adjusts the focus of the lens group 301a, and an optical axis of the optical system 301 that can swing with respect to the light receiving surface of the imaging unit 201. An inclination mechanism 301c for inclining and an aperture mechanism 301d for adjusting the amount of incident light collected by the lens group 301a are provided.

  The lens driving unit 302 is configured using a DC motor, a stepping motor, or the like. The lens driving unit 302 adjusts the focus of the optical system 301 by moving the lens group 301a of the optical system 301 along the optical axis by driving the focus mechanism 301b.

  The position detection unit 303 detects the position of the lens group 301a in the optical axis direction. Specifically, the position detector 303 detects the amount of extension of the lens group 301a.

  The tilt detection unit 304 detects a tilt amount, which is a displacement amount from the reference position, with a position orthogonal to the optical axis of the optical system 301 and the light receiving surface of the imaging unit 201 as a reference position. In this sense, in the first embodiment, the inclination detection unit 304 functions as a displacement amount detection unit.

  The aperture driving unit 305 is configured using a stepping motor or the like. The aperture driving unit 305 adjusts the amount of light incident on the imaging unit 201 by driving the aperture mechanism 301d.

  As shown in FIG. 1, the lens operation unit 306 is a focus ring provided around the lens barrel of the lens unit 3, and receives a signal for driving the lens driving unit 302. The lens operation unit 306 may be a push switch or the like.

  The lens communication unit 307 is a communication interface for communicating with the first communication unit 207 of the main body unit 2 when the lens unit 3 is attached to the main body unit 2.

  The lens storage unit 308 stores a control program and various parameters for determining the position and movement of the lens group 301a of the optical system 301. The lens storage unit 308 includes an aberration information storage unit 308 a regarding various aberrations of the lens unit 3. Further, the lens storage unit 308 includes tilt angle limit value information of the lens unit 3, closest distance limit information, constraint condition information that restrains movement of the lens unit 3, focus position information corresponding to the tilt angle of the optical system 301, The focus position information determined by the extendable range of the lens unit 3, the tilt angle of the optical system 301 and the extension amount of the lens unit 3 are stored.

  FIG. 4 is a diagram illustrating an example of aberration information of the lens unit 3 stored in the aberration information storage unit 308a. As shown in FIG. 4, in the aberration information table T1, the deviation angle φ from the optical axis and the aberration when an image formed at a position away from the optical system 301 by a focal length is viewed from the center of the optical system 301. (Ray aberration) The relationship with s is described. For example, when the deviation angle φ is 5 °, the aberration s is described as 0.1 mm.

  FIG. 5 is a diagram illustrating another example of the aberration information of the lens unit 3 stored in the aberration information storage unit 308a. As shown in FIG. 5, the aberration information table T2 describes the relationship between the aforementioned shift angle φ and chromatic aberration. For example, when the deviation angle is 5 °, the chromatic aberration of the three components R (red), G (green), and B (blue) is described as 98%, 96%, and 93%, respectively. When the shift angle φ is 10 °, the chromatic aberrations of the three components R, G, and B are described as 96%, 92%, and 85%, respectively. In general, the light having a smaller wavelength has a higher refractive index. For this reason, the chromatic aberration of the B component having the smallest wavelength among the three components of R, G, and B is the largest. Further, the chromatic aberration increases as the shift angle φ increases.

  The lens control unit 309 is configured using a CPU (Central Processing Unit) or the like. The lens control unit 309 controls the operation of the lens unit 3 according to an instruction signal from the main body unit 2 or an instruction signal from the lens operation unit 306.

  Here, with reference to FIG. 6, the structure of the principal part of the lens part 3 is demonstrated. FIG. 6 is a cross-sectional view schematically showing the configuration of the main part of the lens unit 3. In FIG. 6, the left side is the subject side (hereinafter referred to as “front”), and the right side is the side attached to the main body 2 (hereinafter referred to as “rear”).

As shown in FIG. 6, the lens unit 3 includes a first frame 31 that holds the lens group 301a and the diaphragm mechanism 301d, a second frame 32 that holds the first frame 31 so as to be movable in the front-rear direction, and a point O _1. And a third frame 33 that holds the second frame 32 in a swingable manner about the rotation center. A position detection unit 303 is provided inside the second frame 32, and an inclination detection unit 304 is provided inside the third frame 33.

  The position detection unit 303 is configured by a reflective displacement sensor or the like. Specifically, the position detection unit 303 includes a photo interrupter 303a having a light emitting element and a light receiving element, and a reflecting member 303b having a reflectance that varies depending on the position. The photo interrupter 303 a is provided on the inner peripheral side of the second frame 32, and the reflecting member 303 b is provided on the outer peripheral side of the first frame 31. The position detection unit 303 calculates the amount of extension of the first frame 31 by reflecting the light irradiated by the photo interrupter 303a by the reflecting member 303b and causing the photo interrupter 303a to receive the light reflected by the reflecting member 303b. The position of the lens group 301a in the optical axis direction is detected from the extended amount. The position detection unit 303 may use various position sensors. Further, the reflecting member 303b may be formed by integrally molding portions having different reflectivities instead of separate members.

The tilt detection unit 304 detects the tilt angle of the second frame 32 with respect to the point O ₁ , thereby directing the optical axis of the optical system 301 from a position where the optical axis of the optical system 301 and the light receiving surface of the imaging unit 201 are orthogonal to each other. Detect the direction you are doing. The inclination detection unit 304 includes a photo interrupter 304a and a reflection member 304b. The tilt detection unit 304 may use various position sensors. Further, the reflecting member 304b may be formed by integrally molding portions having different reflectivities instead of separate members.

  The lens unit 3 having the above configuration is focused only in the vicinity of the optical axis of the optical system 301, and the periphery thereof is blurred radially. Further, in the lens unit 3, the aberration on the side opposite to the side on which the optical axis is inclined becomes the largest.

  A method of operating the lens unit 3 configured as described above will be described. FIG. 7 is a diagram schematically illustrating a method for operating the lens unit 3. FIG. 8 is a diagram schematically illustrating an outline of the lens unit 3 that operates by the operation illustrated in FIG. 7.

  As shown in FIGS. 7 and 8, when the user operates the lens operation unit 306 to adjust the focus of the optical system 301 (FIG. 7A), the lens control unit according to the operation amount of the lens operation unit 306. 309 drives the lens driving unit 302 to extend the first frame 31 forward (FIG. 8A). Thereby, the lens unit 3 adjusts the focus of the optical system 301.

  Thereafter, the tilt mechanism 301c tilts the first frame 31 according to the operation of the lens barrel by the user (FIG. 7B) (FIG. 8B). Thereby, the lens unit 3 can change the optical axis of the optical system 301 from a position orthogonal to the light receiving surface of the imaging unit 201. Note that the lens control unit 309 may perform autofocus processing for automatically adjusting the focus of the optical system 301 under the control of the AF control unit 215f.

  Next, a change in aberration caused by a change in the optical axis of the lens unit 3 with respect to the light receiving surface of the imaging unit 201 will be described. FIGS. 9 to 12 are diagrams schematically illustrating a change in aberration caused by a change in the optical axis of the lens unit 3 with respect to a direction perpendicular to the light receiving surface of the imaging unit 201. 9 to 12 show a case where the lens group 301a is composed of one lens. Hereinafter, a state where the optical axis of the optical system 301 passes through the center of the light receiving surface of the imaging unit 201 and is at a position orthogonal to the light receiving surface of the imaging unit 201 is referred to as an “initial state”.

As shown in FIG. 9, when the distance from the light receiving surface of the imaging unit 201 to the two subjects E11 and E12 is the same (d ₁ ), the subject E11 is focused on the lens group 301a that is not sufficiently corrected for aberrations. Then, an aberration s ₁ occurs in the image of the subject E12 formed in the imaging unit 201. For this reason, the image of the subject E12 is formed blurred on the light receiving surface of the imaging unit 201. However, by utilizing this aberration as one of the expressions, it is possible to change the expression of the image to be captured.

Furthermore, as shown in FIG. 10, when tilting the lens unit 301a with respect to the light receiving surface of the imaging unit 201 at an inclined angle (e.g. θ = 5 °), incident from the periphery of the image is further optical axis L ₁ the center of the subject E12 Therefore, the aberration s _{2 of the} subject E12 formed in the imaging unit 201 is larger than the aberration s ₁ (s ₁ <s ₂ ). As a result, the image to be picked up has a further enhanced difference between the subject E11 and the subject E12. In FIG. 10, the inclination angle θ from the initial state of the lens group 301a is set to a small value that hardly affects the image of the subject E11.

As shown in FIG. 11, when the distance d ₁ from the imaging unit 201 to the subject E 11 is smaller than the distance d ₂ from the imaging unit 201 to the subject E 12 (d ₁ <d ₂ ), the image of the subject E 12 is for incident from a position distant from the optical axis L ₁ than the case shown in FIG. 10, the aberration s ₃ of the subject E12 formed on the imaging unit 201 is further increased as compared with the aberration s ₂ (s ₂ < s _3). Also in FIG. 11, the inclination angle θ from the initial state of the lens group 301a is set to be small enough to hardly affect the image of the subject E11.

Further, as shown in FIG. 12, the distance _{d 3} from the imaging unit 201 to the object E11 is smaller than the distance _{d 2 (d 1 <d 2} ), and the lens group 301a after being inclined from the initial state If the subject E11 on the optical axis L ₁ is positioned and to focus the lens 301a to the subject E11, becomes a difference between the object E11 and the subject E12 (aberration _{s 4)} has more been further emphasized.

  FIG. 13 is a diagram illustrating an image change example corresponding to a change in the optical axis of the optical system 301. An image W11 illustrated in FIG. 13A is an image captured by the lens group 301a in the initial state while focusing on the face of a person who is a subject. An image W12 shown in FIG. 13B is an image captured by focusing on a person's face with the lens group 301a tilted from the initial state. When comparing the image W11 and the image W12, the periphery of the person's face spreads radially and blurs in both images (indicated by broken lines), but the blur amount (aberration) of the image W12 is larger than that of the image W11. It has become.

  As described above, in the case of the optical system 301, when the lens group 301a is tilted from the initial state, an image in which the difference between the vicinity of the optical axis and the periphery thereof is further emphasized can be captured.

  Although FIG. 13 illustrates one lens (single lens), the optical system 301 is an achromatic cemented lens, and the amount of aberration (particularly chromatic aberration) generated by tilting (tilting) is reduced. The optical system 301 can be miniaturized and the work can be reduced in color bleeding. On the other hand, by making the combination of the glass of the cemented lens opposite to the above and intentionally increasing the chromatic aberration, it is possible to make a work with an impression different from usual. Further, the optical system 301 is composed of a plurality of three or more lenses, and the lens control unit 309 drives the lens driving unit 302 to control the generation amount of the optical aberration to be small or large, so that it is included in the image. Control may be performed to adjust the amount of radial blur that occurs. Thereby, the variation of a work can be increased more.

  In the imaging apparatus 1 having the above configuration, a lens unit other than the lens unit 3 that is a tilt lens can be mounted. Therefore, in the following description, the lens units that can be attached to the imaging apparatus 1 are collectively referred to as “lens unit 3G”. The lens unit 3G includes at least a lens communication unit 307 and a lens control unit 309.

  Next, operations performed by the imaging apparatus 1 according to the first embodiment will be described. FIG. 14 is a flowchart illustrating an outline of processing performed by the imaging apparatus 1.

  In FIG. 14, the case where the imaging device 1 is set to the shooting mode will be described (step S101: Yes). In this case, the display control unit 215h displays the live view image on the display unit 210 (step S102). In addition, the lens control unit 309 communicates the lens state of the lens unit 3G with the control unit 215 (step S103).

  Subsequently, the control unit 215 determines whether the lens unit 3G attached to the main body unit 2 is a tilt lens based on a signal input from the lens control unit 309 (step S104). When the lens unit 3G mounted on the main body unit 2 is a tilt lens (step S104: Yes), the imaging device 1 executes a tilt lens display correction process for performing display correction and image correction in accordance with the lens characteristics of the tilt lens. (Step S105), the process proceeds to Step S106. The details of the tilt lens display correction process will be described later.

  On the other hand, when the lens unit 3G attached to the main body unit 2 is not a tilt lens (step S104: No), the imaging device 1 proceeds to step S106.

  In step S106, when the release switch 209b is fully pressed and a second release signal is input (step S106: Yes), the imaging apparatus 1 performs shooting under the control of the shooting control unit 215g (step S107). The acquired image data is recorded in the storage unit 212 (step S108).

  Subsequently, when the power switch 209a is pressed while the imaging apparatus 1 is in the activated state (step S109: Yes), the control unit 215 performs control to turn off the power (step S110), and ends a series of processes.

  In step S106, when the second release signal is not input via the release switch 209b (step S106: No), the imaging apparatus 1 proceeds to step S109.

  A case where the power switch 209a is not pressed in step S109 (step S109: No) will be described. In this case, when the lens unit 3G is replaced with another lens unit 3G (step S111: Yes), the control unit 215 acquires lens type information from the newly mounted lens unit 3G (step S112). Thereafter, the imaging apparatus 1 returns to step S101. On the other hand, when the power switch 209a is not pressed (step S109: No), if the lens unit 3G is not replaced with another lens unit 3G (step S111: No), the imaging device 1 returns to step S101.

  Next, a case where the shooting mode is not set in step S101 (step S101: No) will be described. In this case, when the imaging device 1 is set to the reproduction mode (step S113: Yes), the display control unit 215h displays the image file list on the display unit 210 (step S114).

  Subsequently, when an image file to be enlarged and displayed is selected via the operation input unit 209 or the touch panel 211 (step S115: Yes), the display control unit 215h reproduces and displays the selected image file on the display unit 210. (Step S116).

  Thereafter, when another image file is newly selected (step S117: Yes), the imaging apparatus 1 returns to step S116. On the other hand, when another image file is not selected (step S117: No), the imaging device 1 proceeds to step S118.

  Subsequently, when an image reproduction end instruction signal is input from the operation input unit 209 or the touch panel 211 (step S118: Yes), the imaging apparatus 1 proceeds to step S109. On the other hand, when the end instruction signal is not input (step S118: No), the imaging apparatus 1 returns to step S114.

  If no image file is selected in step S115 (step S115: No), the imaging apparatus 1 proceeds to step S118.

  In step S113, when the imaging device 1 is not set to the reproduction mode (step S113: No), the imaging device 1 returns to step S101.

  Next, the tilt lens display correction process in step S105 shown in FIG. 14 will be described. FIG. 15 is a flowchart showing an outline of the tilt lens display correction process. Hereinafter, in steps S <b> 201 to S <b> 215 showing processing when the lens unit 3 </ b> G is a tilt lens (the lens unit 3 described above), the lens unit 3 </ b> G is described as the lens unit 3.

  As illustrated in FIG. 15, the control unit 215 includes an inclination including an angle and a direction from the initial position of the optical axis of the optical system 301 detected by the inclination detection unit 304 via the first communication unit 207 and the lens communication unit 307. Information is acquired (step S201).

  Subsequently, the state determination unit 215c determines whether or not the tilt operation of the lens unit 3 has been performed based on the tilt information acquired by the control unit 215 (step S202). When the tilting operation of the lens unit 3 is performed (step S202: Yes), the imaging device 1 proceeds to step S203 described later. On the other hand, when the tilting operation of the lens unit 3 is not performed (step S202: No), the imaging device 1 returns to the main routine illustrated in FIG.

  The case where the tilt operation of the lens unit 3 is performed in step S202 (step S202: Yes) will be described. In this case, the area calculation unit 215d receives light of the imaging unit 201 including the position from the position where the optical axis of the lens unit 3 intersects the light receiving surface of the imaging unit 201 to the vicinity of this position based on the tilt information acquired by the control unit 215. The incident area of the light ray on the surface is calculated (step S203). Specifically, the region calculation unit 215d determines the position at which the optical axis of the lens unit 3 intersects the light receiving surface of the imaging unit 201 based on the angle from the reference position of the optical unit of the lens unit 3 detected by the tilt detection unit 304. And the incident area of the light ray on the light receiving surface of the image pickup unit 201 including the vicinity from the position to the periphery is calculated.

  Subsequently, the control unit 215 determines whether or not the imaging apparatus 1 is set to a manual mode in which the user manually adjusts the focus of the optical system 301 (step S204). Specifically, the control unit 215 determines whether or not the imaging apparatus 1 is set to the manual mode based on the instruction signal input from the shooting mode changeover switch 209c. When the imaging device 1 is set to the manual mode (step S204: Yes), the imaging device 1 proceeds to step S205 described later. On the other hand, when the imaging device 1 is not set to the manual mode (step S204: No), the imaging device 1 proceeds to step S209 described later.

  In step S205, the control unit 215 determines whether or not a focus assist operation has been performed within a predetermined time (for example, 5 seconds). Specifically, as shown in FIG. 16, the control unit 215 is touched in an area corresponding to any of the designated color icons A1 to A4 in the image W21 displayed by the display unit 210. It is determined whether or not an instruction signal corresponding to the touched area is input from touch panel 211. When the focus assist operation is performed (step S205: Yes), the imaging device 1 proceeds to step S206 described later. On the other hand, when the focus assist operation is not performed within the predetermined time (step S205: No), the imaging apparatus 1 returns to the main routine shown in FIG.

  Here, the icons A1 to A4 shown in FIG. 16 will be described. The icon A1 is an icon that accepts an input of an instruction signal that sets a focused region of a light beam having a wavelength of green (λ = 500 to 560 nm) in the incident region as a target region for correcting the color shift. The icon A2 is an icon that accepts an input of an instruction signal that sets a focused area of a light beam having a red wavelength (λ = 610 to 750 nm) in the incident area as a target area for correcting the color shift. The icon A3 is an icon that receives an input of an instruction signal that sets a focused region of a light beam having a wavelength of blue (λ = 435 to 480 nm) in the incident region as a target region for correcting the color shift. The icon A4 is an icon for receiving an input of an instruction signal for setting a focused region of a light beam having an orange color (λ = 595 to 610 nm), which is a combination of green and red, in the incident region as a target region for correcting the color shift. is there.

  In step S <b> 206, the color correction processing unit 215 e sets the in-focus area corresponding to the wavelength of the designated color designated in the incident area as a target area for correcting color misregistration in accordance with the instruction signal input from the touch panel 211. Then, each color shift in the target area is corrected (step S207).

  FIG. 17 is a diagram schematically illustrating the state of a point image due to axial chromatic aberration of the optical system 301. FIG. 18 is a perspective view for schematically explaining the state of a point image due to axial chromatic aberration of the optical system 301 in the situation shown in FIG. In FIGS. 17 and 18, a case will be described in which focusing is performed in a focusing region of a light beam having a wavelength of green and color misregistration is corrected. In FIG. 17 and FIG. 18, for the sake of simplification of description, light rays that are incident on and transmitted through the lens group 301a will be described focusing on the three primary colors red, blue, and green.

As shown in FIGS. 17 and 18, the initial in the case of performing the focusing in the area of the image light L _G wavelength is green passes, the optical axis L of the optical system 301 is perpendicular to the light receiving surface of the imaging unit 201 position (FIG. 17 (a), the FIG. 18 (a)) when a wavelength region corresponding to the light beam L _R is red is imaged in the back behind the imaging unit 201, light L _B wavelength is blue An area corresponding to is imaged in front of the imaging unit 201. Furthermore, the light beams L _R, an image corresponding to the wavelength of L _B is imaged by almost the same size on the light receiving surface. When the optical axis L of the optical system 301 is inclined upward (angle = θ) from the initial position (FIG. 17A, FIG. 18A) (FIG. 17B). ), Figure 18 (b)), each ray _L R on the light receiving surface of the imaging unit 201, a region corresponding to _{L B} is imaged offset. For example, as shown in FIGS. 17B and 18B, when the main subject near the optical axis L is a white point light source (not shown), an area far from the center of the light receiving surface of the imaging unit 201 is used. There becomes a region I _B which colored blue, oblong imaging state region near the center of the light-receiving surface extending in the tangential direction with a region I _R which colored in red imaging unit 201.

FIG. 19 is a diagram schematically illustrating an outline of the color misregistration correction process performed by the color correction processing unit 215e. As shown in FIG. 19A, when the color correction processing unit 215e sets a designated color designated in the incident area, for example, a focused area having a green wavelength, as a target area for correcting color misregistration, performing from the center of the red image C _R and a light-receiving surface displaced toward the center of the correction, each image of blue C _B shifted outward increases the percentage overlapping the green image C _G. Specifically, as shown in FIG. 19 (b), the color correction processing unit 215e includes coordinates for parallel movement (sliding movement) of the respective red image C _R and blue image C _B green image C _G side of the by performing the conversion, to correct the red image C _R and a blue color shift in the image C _B in the incident area. Thereby, irrespective of the state of the optical axis L of the optical system 301, the image quality in the incident region can be improved. The color correction processing unit 215e is for a region C _w which blank by the coordinate transformation of the red image C _R and blue image C _B, be corrected by performing the complementary processing for complementing a color Good. The color correction processing unit 215e may be corrected color shift by translating the only one of the red image C _R or blue image C _B green image C _G side.

  After step S207, the display control unit 215h displays the in-focus area corresponding to the incident area calculated by the area calculation unit 215d with visual information that can be identified in the area of the live view image displayed by the display unit 210. (Step S208). Specifically, as illustrated in FIG. 20, the display control unit 215 h displays visual information that can identify the region k1 corresponding to the incident region in the region of the live view image W22 displayed by the display unit 210, for example, a focus assist operation. Is displayed on the display unit 210 in the green color designated by. Thereby, the user can easily grasp the in-focus area of the optical system 301 that changes according to the tilting operation of the lens unit 3. After step S208, the imaging apparatus 1 returns to the main routine shown in FIG.

  Next, when the imaging device 1 is not set to the manual mode (step S204: No), when the imaging device 1 is set to the autofocus mode that automatically adjusts the focus of the optical system 301 (step S209: Yes) will be described. At this time, the control unit 215 determines whether or not a focus assist operation has been performed within a predetermined time (for example, 5 seconds) (step S210). When the focus assist operation is performed within the predetermined time (step S210: Yes), the imaging device 1 proceeds to step S211 described later. On the other hand, when the focus assist operation is not performed within the predetermined time (step S210: No), the imaging device 1 proceeds to step S214 described later.

  In step S211, when the first release signal is input by half-pressing the release switch 209b (step S211: Yes), the AF control unit 215f is designated according to the instruction signal input from the touch panel 211. The AF process is executed in the in-focus area of the designated color (step S212). Specifically, as illustrated in FIG. 21, the AF control unit 215f performs a direction P1 (axial direction) orthogonal to a direction P2 (tangential direction) toward the center of the imaging unit 201 in the in-focus area of the specified color. The AF process is performed by driving the lens driving unit 302 and moving the lens group 301a along the optical axis so that the contrast of () is maximized. The AF control unit 215f may detect only the imaging state in the axial (sagittal) direction PI. Thereby, even if the optical axis of the optical system 301 is inclined, the imaging apparatus 1 does not perform the AF process in the tangential direction P2 where the aberration is large, and performs the AF process in the axial (sagittal) direction P1. The focus adjustment 301 can be accurately performed.

  Subsequently, the display control unit 215h causes the display unit 210 to display a rectangular frame that can identify the region corresponding to the incident region in the region of the live view image (step S213). Specifically, as illustrated in FIG. 22, the display control unit 215 h causes the display unit 210 to display a rectangular frame k <b> 2 that can identify the region corresponding to the incident region in the region of the live view image. Thereby, the user can intuitively grasp the focus area of the optical system 301 in the autofocus mode. After step S213, the imaging apparatus 1 returns to the main routine shown in FIG.

  In step S211, when the first release signal is not input (step S211: No), the imaging device 1 proceeds to step S213.

  In step S214, when the first release signal is input (step S214: Yes), the AF control unit 215f performs the AF process in the green focus area in the incident area (step S215), and the imaging apparatus 1 performs step S213. Migrate to

  If the first release signal is not input in step S214 (step S214: No), the imaging apparatus 1 proceeds to step S213.

  According to the first embodiment described above, the optical axis of the optical system 301 is imaged based on the amount of displacement from the initial position of the optical axis of the optical system 301 detected by the tilt detection unit 304 by the region calculation unit 215d. The incident region of the light ray on the light receiving surface of the imaging unit 201 including the position intersecting with the light receiving surface of the unit 201 and the vicinity of this position is calculated, and the display control unit 215h corresponds to the incident region calculated by the region calculating unit 215d. A region in the image to be displayed is displayed on the display unit 210 with visual information that can be identified in the image. As a result, even when the user shoots while tilting the optical axis of the optical system 301, the in-focus area of the optical system 301 can be intuitively grasped. As a result, the user can perform in-focus shooting by performing a focus operation (manual operation) for focusing the optical system 301 while checking a live view image displayed on the display unit 210 in real time.

  Furthermore, according to the first embodiment, since the photographer focuses the optical system 301 near the optical axis of the optical system 301, the lens group 301a only needs to maintain the optical performance near the optical axis. The optical performance can be relaxed in the vicinity other than the optical vicinity. As a result, the number of lenses constituting the lens group 301a can be reduced to reduce the size, and the brightness of the lens group 301a can be improved.

  Further, according to the first embodiment, in response to the instruction signal input from the touch panel 211 by the display control unit 215h, the region in the image corresponding to the incident region is used as the visual information that can be identified in the color space. Are displayed on the display unit 210 with the variables constituting the. As a result, when the user manually adjusts the focus of the optical system 301, the user can take a picture without worrying about color fluctuations near the optical axis of the optical system 301 caused by chromatic aberration of the optical system 301. .

  Furthermore, according to the first embodiment, the AF control unit 215f performs AF processing in the green focus area in the incident area. Thereby, the blur on the red and green optical axes in the incident region can be reduced. Further, the AF control unit 215f visually stands out from the blur of the image corresponding to the blue having the shorter wavelength than the green wavelength because the blur of the image corresponding to the red having the longer wavelength than the green wavelength. When there is a high-luminance red subject, AF processing may be performed in the red focus area in the incident area. Furthermore, the AF control unit 215f may perform the AF process in a focus area of a color (orange) that is a combination of green and red in the incident area. Accordingly, the user can shoot an image that is visually inconspicuous in accordance with the shooting scene.

  Further, according to the first embodiment, when the display control unit 215h is set to the manual mode in the imaging apparatus 1, when the focus assist operation is performed, the region in the image corresponding to the incident region is displayed. While the image is displayed on the display unit 210 in an identifiable color, the area in the image corresponding to the incident area is displayed on the display unit 210 with a rectangular frame when the autofocus mode is set in the imaging apparatus 1. . As a result, it is possible to intuitively grasp the focused area of the optical system 301 while checking the live view image displayed on the display unit 210 in real time.

  Further, according to the first embodiment, the color correction processing unit 215e corrects the color misregistration in the region in the image corresponding to the incident region calculated by the region calculating unit 215d. Thereby, the image quality in the vicinity of the optical axis of the optical system 301 can be improved. Furthermore, since the performance of the axial chromatic aberration of the optical system 301 can be relaxed, the number of lenses constituting the lens group 301a can be reduced to reduce the size.

  Further, according to the first embodiment, the color correction processing unit 215e increases the intensity of correcting the color shift in the incident area as compared with other areas of the light receiving surface of the imaging unit 201. Thereby, a difference in image quality can be provided between the area in the image in which the optical system 301 is in focus and the other area, and a more impressive image can be taken. Further, the color correction processing unit 215e may perform a correction for deteriorating chromatic aberration in a region where the optical system 301 is out of focus.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. The imaging apparatus according to the second embodiment of the present invention has the same configuration as that of the imaging apparatus 1 according to the first embodiment described above, and only the tilt lens display correction process is different. Therefore, only tilt lens display correction processing will be described in the second embodiment. In the description of the drawings, the same portions are denoted by the same reference numerals.

  FIG. 23 is a flowchart showing an outline of the tilt lens display correction process. Hereinafter, in steps S301 to S317 indicating processing when the lens unit 3G is a tilt lens (the lens unit 3 described above), the lens unit 3G is referred to as the lens unit 3.

  As illustrated in FIG. 23, the control unit 215 includes an inclination including an angle and a direction from the initial position of the optical axis of the optical system 301 detected by the inclination detection unit 304 via the first communication unit 207 and the lens communication unit 307. Information is acquired (step S301).

  Subsequently, the state determination unit 215c determines whether or not the tilt operation of the lens unit 3 has been performed based on the tilt information acquired by the control unit 215 (step S302). When the tilting operation of the lens unit 3 is performed (step S302: Yes), the imaging device 1 proceeds to step S303 described later. On the other hand, when the tilt operation of the lens unit 3 is not performed (step S302: No), the imaging device 1 proceeds to step S315 described later.

  The case where the tilt operation of the lens unit 3 is performed in step S302 (step S302: Yes) will be described. In this case, the area calculation unit 215d receives light of the imaging unit 201 including the position from the position where the optical axis of the lens unit 3 intersects the light receiving surface of the imaging unit 201 to the vicinity of this position based on the tilt information acquired by the control unit 215. The incident area of the light ray on the surface is calculated (step S303).

  Subsequently, when the imaging apparatus 1 is set to the manual mode (step S304: Yes), the color correction processing unit 215e sets the green focus area in the incident area as a target area for correcting the color shift ( In step S305, the color shift of each color in the target area is corrected (step S306).

Thereafter, when a focus assisting operation is performed within a predetermined time (for example, within 5 seconds) (step S307: Yes), the color correction processing unit 215e corrects the saturation in the target region in which the color misregistration of each color is corrected ( Step S308). Specifically, as illustrated in FIG. 24, the color correction processing unit 215 e performs each color (C) of the target region with respect to the target region (FIG. 24A → FIG. 24B) in which the color shift of each color is corrected. _B, C G, the processing for each color of the target area in gray C _a by performing the saturation conversion processing for reducing the color saturation of the _{C R)} performed (FIG. 24 (c)).

  Subsequently, the display control unit 215h displays the in-focus area corresponding to the target area for which the color correction processing unit 215e has performed the saturation conversion process in the live view image displayed by the display unit 210 (step S309). Specifically, as illustrated in FIG. 25, the display control unit 215h causes the display unit 210 to display the focused region k3 in the live view image W23 displayed by the display unit 210 in gray. Thus, the user can more intuitively understand the in-focus area of the lens unit 3 while viewing the live view image displayed on the display unit 210. After step S309, the imaging apparatus 1 returns to the main routine shown in FIG.

  In step S307, when the focus assist operation is not performed within the predetermined time (step S307: No), the imaging device 1 returns to the main routine shown in FIG.

  Next, the case where the imaging apparatus 1 is set to the autofocus mode (step S310: Yes) when the imaging apparatus 1 is not set to the manual mode in step S304 (step S304: No) will be described. At this time, the color correction processing unit 215e sets the green focus area in the incident area as a target area for correcting the color shift (step S311), and corrects the color shift of each color in the target area (step S312).

  Subsequently, when the first release signal is input (step S313: Yes), the AF control unit 215f executes the AF process in the green focused region in the target region set by the color correction processing unit 215e (step S314). The imaging apparatus 1 proceeds to step S307.

  In step S313, when the first release signal is not input (step S313: No), the imaging device 1 proceeds to step S307.

  A case where the imaging apparatus 1 is not set to the autofocus mode in step S310 (step S310: No) will be described. In this case, the imaging apparatus 1 returns to the main routine shown in FIG.

  Next, a case where the tilt operation of the lens unit 3 is not performed in step S302 (step S302: No) will be described. In this case, the control unit 215 determines whether or not a focus assist operation has been performed within a predetermined time (for example, within 5 seconds) (step S315). When the focus assist operation is performed (step S315: Yes), the imaging device 1 proceeds to step S316 described later. On the other hand, when the focus assist operation is not performed within the predetermined time (step S315: No), the imaging apparatus 1 returns to the main routine shown in FIG.

  In step S316, the color correction processing unit 215e corrects the saturation in the screen center area of the live view image. Specifically, the color correction processing unit 215e performs a process of making the screen center region gray by performing a saturation conversion process for reducing the saturation in the screen center region of the live view image.

  Subsequently, the display control unit 215h displays the screen center area on which the color correction processing unit 215e has performed the saturation conversion processing in the live view image displayed by the display unit 210 (step S317). Specifically, as illustrated in FIG. 26, the display control unit 215h causes the display unit 210 to display the screen center region k4 in the live view image W24 displayed by the display unit 210 in gray. After step S317, the imaging apparatus 1 returns to the main routine shown in FIG.

  According to the second embodiment described above, the same effects as those of the first embodiment described above can be obtained. Further, when the optical axis of the optical system 301 is inclined, the color correction processing unit 215e always corrects each color shift in the incident region. Accordingly, the user can intuitively grasp the in-focus area of the optical system 301 while viewing the live view image displayed on the display unit 210 without performing a focus assist operation.

(Other embodiments)
FIG. 27 is a diagram illustrating a main part of another configuration example of the lens unit. As shown in FIG. 27, the lens unit 6 includes a first frame 61 that holds the lens group 301a and the diaphragm mechanism 301d, a second frame 62 that holds the first frame 61, and a center point O ₁ as the center of rotation. It has the 3rd frame 63 which hold | maintains the 2 frames 62 so that rocking | fluctuation is possible in all directions, and the 4th frame 64 which hold | maintains the 3rd frame 63 so that a movement to the front-back direction is possible. In addition, an inclination detection unit 304 is provided inside the third frame 63, and a position detection unit 303 is provided inside the fourth frame 64.

  An operation method of the lens unit 6 configured as described above will be described. FIG. 28 is a diagram schematically illustrating the operation of the lens unit 6.

  As shown in FIG. 28, the lens unit 6 is brought into focus by moving the first frame 61 and the second frame 62 in the front-rear direction according to the operation amount of the lens operation unit 306 by the user (FIG. 28A). adjust. Thereafter, the user operates the lens operation unit 306 of the lens unit 6 to incline the first frame 61 and the second frame 62 at a predetermined angle (FIG. 86B).

  By using the lens unit 6 configured in this way, the direction of the optical axis of the optical system 301 with respect to the direction orthogonal to the light receiving surface of the imaging unit 201 can be changed, and the same effect as the above-described embodiment can be obtained. Play.

  FIG. 29 is a perspective view illustrating still another configuration example of the lens unit and a configuration of the imaging device 1 on which the lens unit is mounted facing the subject (front side). As shown in FIG. 29, the lens unit 7 holds the optical system 701, the optical system holding unit 702 that holds the optical system 701, and the optical system holding unit 702 so that the optical system holding unit 702 can be advanced and retracted in the front-rear direction. And an accordion-like connecting portion 703 that is swingably connected in all directions. When the lens unit 7 having the above configuration is applied, the user determines the field of view and focuses by holding the optical system holding unit 702 and fixing the optical system 701 in a desired direction. be able to. It is also possible to further provide a fixing mechanism for fixing the connected state of the connecting portion 703 to the lens portion 7.

  By using the lens unit 7 configured in this way, the optical axis of the optical system 301 can be changed with respect to the direction orthogonal to the light receiving surface of the imaging unit 201, and the same effect as the above-described embodiment can be obtained. Play.

  In the above-described embodiment, the aberration information storage unit 308a of the lens storage unit 308 stores information related to chromatic aberration of the lens unit 3, but may be stored in the storage unit 212 of the main body unit 2. Furthermore, the control unit 215 may acquire information regarding the chromatic aberration of the lens unit 3 via a network, and store the acquired information in the storage unit 212.

  In the above-described embodiment, the imaging apparatus 1 has been described as a digital single-lens reflex camera. However, for example, a digital camera, a digital video camera, and a camera-equipped mobile phone in which a lens unit 3 and a main unit 2 are integrally formed. The present invention can be applied to various electronic devices having a photographing function and a display function such as a personal computer, a portable electronic tablet, and a digital photo frame.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Main-body part 3,6,7 Lens part 4 Accessory 31,61 1st frame 32,62 2nd frame 33,63 3rd frame 64 4th frame 201 Imaging part 202 Imaging drive part 203 Signal processing part 204 Flash Light emitting unit 205 Posture detection unit 206 Timer 207 First communication unit 208 Second communication unit 209 Operation input unit 209a Power switch 209b Release switch 209c Shooting mode switch 209d Operation switch 209e Menu switch 209f Display switch 210 Display unit 211 Touch panel 212 Memory Unit 213 power supply unit 214 power supply unit 215 control unit 215a image processing unit 215b face detection unit 215c state determination unit 215e color correction processing unit 215f AF control unit 215g imaging control unit 215h display control unit 301,701 optical System 301a Lens group 301b Focus mechanism 301c Tilt mechanism 301d Aperture mechanism 302 Lens drive unit 303 Position detection unit 304 Tilt detection unit 305 Aperture drive unit 306 Lens operation unit 307 Lens communication unit 308 Lens storage unit 308a Aberration information storage unit 309 Lens control unit 401 Accessory communication unit 702 Optical system holding unit 703 Connection unit

Claims (20)

An optical system having a lens group composed of one or a plurality of lenses, and an imaging unit that receives light collected by the optical system and performs photoelectric conversion to generate electronic image data. An imaging device capable of displacing the optical axis of the system,
A display unit for displaying an image corresponding to the image data generated by the imaging unit;
A displacement amount detection unit that detects a displacement amount from the reference position with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position;
Based on the detection result of the displacement amount detection unit, an area calculation unit that calculates an incident area of a light beam on the light receiving surface including from the position where the optical axis intersects the light receiving surface to the vicinity of the position;
A display control unit that causes the display unit to display a region in the image corresponding to the incident region calculated by the region calculation unit with visual information that can be identified in the image;
An imaging apparatus comprising:   The imaging apparatus according to claim 1, wherein the visual information is a variable constituting a color space.   The imaging apparatus according to claim 2, wherein the variable constituting the color space is any one of a primary color system specific component, a complementary color system specific component, hue, saturation, and brightness.   The imaging apparatus according to claim 1, wherein the visual information is a rectangular frame. An input unit that receives an input of an instruction signal that instructs the display control unit to change the visual information;
The imaging apparatus according to claim 1, wherein the display control unit changes the visual information in accordance with the instruction signal input by the input unit. The imaging apparatus can set a manual mode for manually adjusting the focus of the imaging unit and an autofocus mode for automatically adjusting the focus of the imaging unit,
The input unit includes a shooting mode changeover switch that receives an input of an instruction signal for setting the manual mode or the autofocus mode to the imaging apparatus;
When the imaging apparatus is set to the manual mode, the display control unit causes the display unit to display the region of the image corresponding to the incident region on the display unit with visual information that can be identified in the image. 6. When the imaging apparatus is set to the autofocus mode, an area corresponding to the incident area is displayed on the display unit with a rectangular frame. Imaging device. An optical system having a lens group composed of one or a plurality of lenses, and an imaging unit that receives light collected by the optical system and performs photoelectric conversion to generate electronic image data. An imaging device capable of displacing the optical axis of the system,
A displacement amount detection unit that detects a displacement amount from the reference position with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position;
Based on the detection result of the displacement amount detection unit, an area calculation unit that calculates an incident area of a light beam on the light receiving surface including from the position where the optical axis intersects the light receiving surface to the vicinity of the position;
A color correction processing unit that corrects a color shift in the incident region calculated by the region calculation unit;
An imaging apparatus comprising:   The color correction processing unit is configured to display an image corresponding to the color of each pixel of the light receiving surface in the incident region in a direction in which the optical axis is displaced according to the displacement amount detected by the displacement amount detection unit. The imaging apparatus according to claim 7, wherein correction for moving the image is performed.   The imaging apparatus according to claim 7, wherein the color correction processing unit increases the intensity of correcting the color shift in the incident area as compared with other areas on the light receiving surface. A lens information storage unit that stores lens characteristic information indicating characteristics of the optical system;
The image pickup apparatus according to claim 7, wherein the color correction processing unit corrects the color shift with reference to the lens characteristic information.   The incident area calculated by the area calculation unit is set as a focusing area, and the focus of the optical system is adjusted based on a contrast or phase difference in a direction different from the direction toward the center of the light receiving surface in the focusing area. The imaging apparatus according to claim 1, further comprising a focus control unit for adjustment. A lens driving unit that moves the lens group along the optical axis;
The imaging apparatus according to claim 11, wherein the focus control unit drives the lens driving unit so that the contrast is maximized.   The imaging apparatus according to claim 12, wherein the focus control unit adjusts a focus of the optical system based on a contrast corresponding to a predetermined color on a light receiving surface of the imaging unit.   The image pickup apparatus according to claim 1, wherein the optical system is detachable from the image pickup apparatus. An optical system having a lens group composed of one or a plurality of lenses, and an imaging unit that receives light collected by the optical system and performs photoelectric conversion to generate electronic image data. An imaging method performed by an imaging apparatus capable of displacing an optical axis of a system,
A display step of displaying an image corresponding to the image data generated by the imaging unit;
A displacement amount detection step of detecting a displacement amount from the reference position, with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position;
Based on the detection result of the displacement amount detection step, a region calculation step for calculating a light incident region on the light receiving surface including from the position where the optical axis intersects the light receiving surface to the vicinity of the position;
A display control step of causing the display unit to display a region in the image corresponding to the incident region calculated in the region calculation step with visual information identifiable in the image;
An imaging method comprising: An optical system having a lens group composed of one or a plurality of lenses, and an imaging unit that receives light collected by the optical system and performs photoelectric conversion to generate electronic image data. An imaging method performed by an imaging apparatus capable of displacing an optical axis of a system,
A displacement amount detection step of detecting a displacement amount from the reference position, with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position;
Based on the detection result of the displacement amount detection step, a region calculation step for calculating a light incident region on the light receiving surface including from the position where the optical axis intersects the light receiving surface to the vicinity of the position;
A color correction processing unit that corrects a color shift in the region of the light receiving surface corresponding to the incident region calculated by the region calculating step;
An imaging method comprising:   The incident area calculated in the area calculation step is set as a focusing area, and the focus of the optical system is adjusted based on a contrast or phase difference in a direction different from the direction toward the center of the light receiving surface in the focusing area. The imaging method according to claim 15 or 16, further comprising a focus control step of adjusting. An optical system having a lens group composed of one or a plurality of lenses, and an imaging unit that receives light collected by the optical system and performs photoelectric conversion to generate electronic image data. An imaging program to be executed by an imaging device capable of displacing the optical axis of the system,
A display step for displaying an image corresponding to the image data generated by the imaging unit;
A displacement amount detecting step for detecting a displacement amount from the reference position with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position;
Based on the detection result of the displacement amount detection step, an area calculation step of calculating an incident area of a light beam on the light receiving surface including from the position where the optical axis intersects the light receiving surface to the vicinity of the position;
A display control step of causing the display unit to display a region in the image corresponding to the incident region calculated in the region calculation step with visual information identifiable in the image;
The imaging program characterized by performing. An optical system having a lens group composed of one or a plurality of lenses, and an imaging unit that receives light collected by the optical system and performs photoelectric conversion to generate electronic image data. An imaging program to be executed by an imaging device capable of displacing the optical axis of the system,
A displacement amount detecting step for detecting a displacement amount from the reference position with a position where the optical axis is orthogonal to the light receiving surface of the imaging unit as a reference position;
Based on the detection result of the displacement amount detection step, an area calculation step of calculating an incident area of a light beam on the light receiving surface including from the position where the optical axis intersects the light receiving surface to the vicinity of the position;
A color correction processing unit that corrects a color shift in the area of the light receiving surface corresponding to the incident area calculated by the area calculating step;
The imaging program characterized by performing.   The incident area calculated by the area calculating step is set as a focusing area, and the focus of the optical system is adjusted based on a contrast or phase difference in a direction different from the direction toward the center of the light receiving surface in the focusing area. 20. The imaging program according to claim 18, further comprising executing a focus control step for adjustment.

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