JP5804882B2 - Imaging apparatus, control method therefor, and program - Google Patents

Description

  The present invention relates to an imaging apparatus, a control method thereof, and a program, and more particularly to an imaging apparatus in which a tilt lens can be attached, a control method thereof, and a program.

  Regarding line superimposition display for assisting composition on a live view at the time of live view imaging, an idea of displaying a line for assisting composition according to the type of lens is disclosed.

  For example, display control of an imaging device that displays a scaled line for a macro lens and a grid line for a tilt lens or a shift lens after discriminating the type of attached lens is disclosed (for example, Patent Document 1).

JP 2007-036983 A

  However, just like the conventional display control technique disclosed in the above-mentioned patent document, the horizontal axis of the line for assisting the composition to be superimposed is displayed so as to be always horizontal with respect to the imaging device. There are cases where it is inconvenient to determine the composition. One example is a tilt lens.

  This tilt lens is mainly used for the purpose of imaging while changing the in-focus range. For the photographer, the direction in which the in-focus range changes is important information for determining the composition.

  The tilt lens can generally adjust the rotation angle around the optical axis, but the direction in which the in-focus range changes varies depending on the setting of the rotation angle. For this reason, it is inconvenient to determine the composition in the line for always assisting the imaging apparatus in the horizontal composition.

  An object of the present invention is to provide an imaging apparatus, a control method thereof, and a program that allow an imager to easily determine a composition in an imaging apparatus to which a tilt lens can be attached.

  In order to achieve the above object, the imaging apparatus according to claim 1 is an imaging apparatus to which a tilt lens can be attached and provided with a display means for displaying a captured image, wherein the tilt angle of the tilt lens around the optical axis is set. An acquisition means for acquiring lens information indicating a line rotated by a horizontal direction or a vertical direction with respect to the imaging device according to a rotation angle around an optical axis indicated by the lens information acquired by the acquisition means, And a control means for controlling the display means so as to be superimposed on the captured image.

  According to the present invention, a photographer can easily determine a composition in an imaging apparatus to which a tilt lens can be attached.

It is sectional drawing of the imaging device and imaging lens which concern on embodiment of this invention. It is a rear view of the imaging device in FIG. It is a figure which shows the electrical structure of the imaging device and imaging lens in FIG. It is a figure which shows the tilt lens operation example. It is a figure for demonstrating the example of a line display which assists a composition. It is a sequence diagram which shows the procedure of the control process performed with an imaging device and an imaging lens. It is a flowchart which shows the procedure of the display process performed by an imaging device. It is a figure for demonstrating the other example of a line display which assists a composition.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of an imaging device and an imaging lens according to an embodiment of the present invention.

  In FIG. 1, an imaging device 101 and an imaging lens 103 are illustrated, and the imaging lens 103 can be attached to the imaging device 101. The imaging lens 103 is electrically and mechanically connected to the imaging device 101 via the mount mechanism 102.

  The imaging lens 103 includes an imaging optical system, a diaphragm mechanism, and an electronic circuit board 104 inside.

  The electrical connection portion of the mount mechanism 102 includes a serial communication terminal in addition to the power supply, and performs bidirectional communication between the imaging device 101 and the imaging lens 103. As an example of specific communication contents, there are information such as a lens driving command and a driving amount for focusing from the imaging device 101 to the imaging lens 103. On the other hand, the communication content from the imaging lens 103 to the imaging device 101 includes information regarding the type and setting of the imaging lens 103.

  In particular, in the tilt lens, lens information such as an optical axis angle with respect to the imaging surface and a rotation angle around the optical axis is transmitted from the imaging device 101 to the imaging lens 103. The tilt lens can change the optical axis angle with respect to the imaging surface and the rotation angle around the optical axis, and by changing the optical axis angle to make the in-focus surface non-parallel to the imaging surface, The matching range can be adjusted.

  The object image captured by the solid-state imaging device 131 is converted into image data by the arithmetic processing circuit 203 mounted on the printed board 141 and displayed on the display unit 142. The display 142 is attached to the back surface of the imaging device 101. That is, the display device 142 corresponds to display means for displaying a captured image.

  The focusing screen 111 is disposed on the planned image plane of the object image. The lens 113 is a lens for an imager to observe an optical viewfinder image at the time of imaging, and actually includes a plurality of lenses. The focusing screen 111, the pentaprism 112, the lens 113, and the finder 114 constitute a finder optical system.

  The half mirror 121 is a movable mirror for dividing the optical path L1 from the imaging optical system and supplying it to the optical viewfinder. A movable sub-mirror 122 is provided behind the half mirror 121.

  The sub mirror 122 deflects the light beam, which is transmitted through the half mirror 121, near the optical axis of the optical path L1 to the focus detection unit 123. The sub mirror 122 rotates around a rotation shaft provided on a holding member (not shown) of the half mirror 121 and moves in conjunction with the movement of the half mirror 121. The focus detection unit 123 performs focus detection by a phase difference detection method.

  The optical path splitting system composed of the half mirror 121 and the sub mirror 122 has the following two states. One is a first optical path division state for guiding light to the above-described finder optical system. The other is a second optical path division state in which the light beam from an imaging lens (not shown) is retracted from the optical path L1 in order to guide the light beam directly to the solid-state imaging device 131. The half mirror 121 and the sub mirror 122 are positioned at the retracted positions 121a and 122a, respectively, when retracted.

  The focal plane shutter 124 includes a front curtain 124a and a rear curtain 124b. The front curtain 124a and the rear curtain 124b are each composed of a plurality of thin film light-shielding materials, and the exposure amount to the solid-state image sensor 131 is controlled by opening and closing them.

  The photometry unit 125 is configured by a photoelectric conversion element. Part of the incident light from the mount side is separated by the half mirror 121 and is incident on the photometry unit 125. Then, the luminance of the surface of the solid-state image sensor 131 can be indirectly perceived from the output of the photometry unit 125. A detailed configuration of the printed circuit board 141 will be described later.

  The AF distance measurement frame display device 161 and the imaging condition and exposure bar display device 162 are display devices in the viewfinder. The imaging conditions are a Tv value, an Av value, and the like, and the imaging conditions and the exposure bar display device 162 are configured by 7 segment LEDs.

  FIG. 2 is a rear view of the imaging apparatus 101 in FIG.

  In FIG. 2, the display unit 142 includes a liquid crystal panel unit and a backlight, and the luminance of the backlight can be changed by the control circuit 202. The contents displayed on the display unit 142 include a menu screen for selecting settings of the imaging apparatus 101 and a playback screen for captured images.

  The release button 151 has two states, an imaging preparation state (SW1) and an imaging start state (SW2), depending on the pressed position of the button. The operation unit 152 includes a plurality of buttons and has different functions. For example, there are an ON / OFF control button of the display 142, a function selection button on the menu screen, a live view imaging start button, a function selection button and an image selection button on the image playback screen.

  The operation unit 153 is an operation unit other than the operation unit 152, and is a dial, a cross button, or the like. The functions are used for function selection on the menu screen and function selection and image selection on the image reproduction screen, as with the operation unit 152.

  FIG. 3 is a diagram illustrating an electrical configuration of the imaging device 101 and the imaging lens 103 in FIG.

  In FIG. 3, a control circuit 202 that mainly controls the operation of the imaging apparatus 101 is mounted on a printed circuit board 141. Further, the printed circuit board 141 is equipped with an arithmetic processing circuit 203 and a storage circuit 204 for temporarily storing the generated image data. The arithmetic processing circuit 203 generates image data from the electrical signal stored in the solid-state imaging device 131 and performs signal processing for displaying the captured image on the display unit 142.

  The drive circuit 211 performs open / close control of the focal plane shutter 124 and up / down control of the half mirror 121 and the sub mirror 122 in order to positively expose the solid-state imaging device 131.

  The switch circuit 212 is a switch such as the release button 151 and the operation unit 153 shown in FIG.

  The operation detection circuit 213 transmits signals of a number of operation members including dials provided in the imaging apparatus 101 such as the operation units 152 and 153 in FIG. 2 to the control circuit 202.

  The power supply circuit 221 is a power supply circuit that converts and supplies the voltage of the battery 222 to a voltage required by each circuit unit constituting the imaging device 101.

  The electronic circuit board 104 is an electronic circuit board of the imaging lens 103, and is mounted with a control circuit 251 that mainly controls the operation of the lens. Functions of the control circuit 251 include communication control with the control circuit 202 of the imaging apparatus 101, operation control between the lens driving circuit 253 and the aperture driving circuit 254, and reception of a detection signal from the operation detection circuit 252.

  The lens driving circuit 253 is a driving circuit that drives the imaging optical system. The diaphragm drive circuit 254 is a drive circuit that drives the diaphragm mechanism.

  The operation detection circuit 252 includes a mechanical member such as a setting switch or button on the lens side, a detection circuit that detects the operation thereof, and the like. In particular, in the present embodiment, the operation detection circuit 252 detects the optical axis angle with respect to the imaging surface of the tilt lens and the rotation angle around the optical axis.

  FIG. 4 is a diagram showing an example of tilt lens operation. FIG. 4A shows an operation example in which the optical axis angle with respect to the imaging surface is changed in the horizontal direction. FIG. 4B shows an operation example in which the rotation angle around the optical axis is changed. FIG. 4C shows an operation example in which the optical axis angle with respect to the imaging surface is changed after changing the rotation angle around the optical axis by 45 °.

  In general, the tilt lens can adjust two kinds of angles, that is, an optical axis angle with respect to the imaging surface and a rotation angle around the optical axis.

  As shown in FIG. 4A, the optical axis angle with respect to the imaging surface generally changes only in one direction along one surface perpendicular to the imaging surface. The tilt lens is characterized in that the in-focus range changes in relation to the direction in which the optical axis angle changes.

  As shown in FIG. 4B, a rotation angle around the optical axis is defined. Then, as shown in FIG. 4A, when the direction in which the optical axis angle changes coincides with the horizontal direction of the imaging device, the rotation angle around the optical axis is 0 °.

  As shown in FIG. 4C, the direction in which the optical axis angle changes with respect to the imaging surface changes according to the rotation angle around the optical axis.

  FIG. 5 is a diagram for explaining a line display example for assisting composition. In the present embodiment, a grid-like grid line is displayed as a line display for assisting composition. This grid line is displayed superimposed on the through image. FIG. 5A illustrates the imaging device 101, the imaging lens 103, and the subject. FIG. 5B shows a line display example for assisting the composition when the rotation angle around the optical axis is 0 °. FIG. 5C shows a line display example for assisting composition when the rotation angle around the optical axis is 45 °.

  The control circuit 202 rotates and displays a line for assisting composition according to the rotation angle around the optical axis. This facilitates composition determination because the direction in which the in-focus range changes coincides with the direction in which the horizontal axis of the line for assisting composition changes.

  In FIG. 5, grid lines are taken as an example, but lines other than grid lines may be used.

  First, as shown in FIG. 5A, the subject has a depth. In FIG. 5B, since the rotation angle around the optical axis is 0 °, the optical axis angle changes in the direction indicated by the arrow 401. Therefore, when the optical axis angle is changed, the in-focus range shown in the range 403 of the screen 402 changes in the horizontal direction.

  Specifically, the in-focus range changes as follows. As shown in FIG. 5A, when the subject is lined up (when the subject on the left side is close and the right subject is far away as viewed from the back of the imaging device 101), the following occurs. . When the imaging device 103 is moved so that the imaging lens 103 tilts to the right when viewed from the back of the imaging device 101 with the subject side tip of the imaging lens 103 fixed, the in-focus range 403 is shifted inward. Narrow. Conversely, when the image pickup apparatus 101 is moved so that the image pickup lens 103 tilts to the left when viewed from the back of the image pickup apparatus 101, the in-focus range 403 is shifted outward and becomes wider. Therefore, in this embodiment, a line orthogonal to the direction in which the in-focus range shifts (a vertical line on the screen 402) and a line parallel to the direction in which the in-focus range shifts (the horizontal direction of the screen 402). The line for assisting the composition is displayed.

  In this way, in the case of FIG. 5B, as shown on the screen 402, the horizontal direction of the imaging apparatus 101 is displayed so that the horizontal axis of the line for assisting the composition coincides.

  In FIG. 5C, since the optical axis angle changes in the direction indicated by the arrow 411, the in-focus range also changes with the direction at an angle of 45 ° with respect to the horizontal direction as one element, as indicated by the range 413. . In such a case, as shown on the screen 412, the line for assisting the composition with respect to the horizontal direction of the imaging apparatus 101 is rotated and displayed at an angle of 45 °. That is, on the screen 412, the line orthogonal to the direction in which the in-focus range shifts and the line parallel to the direction in which the in-focus range shifts are displayed in a state inclined by 45 ° with respect to the screen 402, respectively. ing.

  As described above, in the present embodiment, the line orthogonal to the direction in which the in-focus range shifts and the line parallel to the direction in which the in-focus range shifts are displayed superimposed on the through image. However, only one of the line orthogonal to the direction in which the in-focus range shifts and the line parallel to the direction in which the in-focus range shifts may be displayed. However, since the line orthogonal to the direction in which the in-focus range shifts is a line parallel to the in-focus range, it is preferable to display the line.

  FIG. 6 is a sequence diagram illustrating a procedure of control processing executed by the imaging device 101 and the imaging lens 103.

  This control process is executed by the control circuit 202 and arithmetic processing circuit 203 of the imaging apparatus 101 and the control circuit 251 of the imaging lens 103. In this sequence diagram, the imaging lens 103 is simply expressed as a lens, and the imaging device 101 is simply expressed as a camera.

  In FIG. 6, it is determined whether or not the imaging lens 103 is attached (step S501). When the imaging lens 103 is attached (YES in step S501), lens information is transmitted to the imaging apparatus 101 side (step S504). Examples of the lens information include lens specifications, lens types, aperture information, distance information, an optical axis angle with respect to the imaging surface, a rotation angle around the optical axis, and the like. In the present embodiment, the lens information indicates at least one of the optical axis angle with respect to the imaging surface of the tilt lens and the rotation angle around the optical axis.

  On the other hand, when the imaging lens 103 is not attached (NO in step S501), it is determined whether or not the optical axis angle with respect to the imaging surface is changed (step S502), and when the optical axis angle with respect to the imaging surface is changed (step S502). (YES in S502), the process proceeds to step S504.

  On the other hand, when the optical axis angle with respect to the imaging surface has not been changed (NO in step S502), it is determined whether or not the rotational angle around the optical axis has been changed (step S503), and the rotational angle around the optical axis has been changed. (YES in step S503), the process proceeds to step S504. When the rotation angle around the optical axis is not changed (NO in step S503), the process returns to step S501 again.

  The above is the control processing by the imaging lens 103. On the other hand, the imaging device 101 receives the lens information (step S511), stores the received lens information in a storage device such as the storage circuit 204 (step S512), and returns to step S511. Step S511 corresponds to an acquisition unit that acquires lens information indicating at least one of the optical axis angle of the tilt lens with respect to the imaging surface and the rotation angle around the optical axis.

  As described above, the example in which the lens information is transmitted from the imaging lens 103 to the imaging device 101 has been described. However, the lens information may be transmitted to the imaging device 101 when the imaging lens 103 is attached or the setting of the imaging lens 103 is changed. If possible, the present invention is not limited to the control process described above.

  FIG. 7 is a flowchart illustrating a procedure of display processing executed by the imaging apparatus 101.

  In FIG. 7, when the start of live view is instructed by the photographer (YES in step S601), lens information is acquired from the storage device described above. At this time, display of the through image on the display unit 142 is started. The live view start instruction is performed, for example, when the photographer presses a corresponding button on the operation unit 152.

  Next, the display angle of the line for assisting composition is changed based on the angle information about the optical axis of the tilt lens from the lens information (step S603), and the line is displayed (step S604). Here, a line is displayed superimposed on the through image. Here, the angle information about the optical axis is used, but also in the case of the optical axis angle with respect to the imaging surface, a line indicating the direction in which the in-focus range changes is superimposed and displayed on the image indicating the subject. Step S604 corresponds to a control unit that controls the display unit 142 so as to superimpose and display a line indicating the direction in which the in-focus range changes according to the acquired lens information on the image indicating the subject. .

  Next, it is determined whether or not the photographer has instructed to stop the live view (step S605), and when the stop has been instructed (YES in step S605), this process ends. At this time, the display on the display 142 is also terminated. On the other hand, when stop is not instructed (NO in step S605), the process returns to step S602. When returning to this step S602, the processing of S602 to 605 is repeated at a constant cycle.

  By performing the control process and the display process described above, the information on the rotation angle around the optical axis is reflected in the line display for assisting the composition when the tilt lens is used. As a result, composition setting is facilitated.

  6 and 7, the lens information indicating at least one of the optical axis angle with respect to the imaging surface of the tilt lens and the rotation angle around the optical axis is acquired (step S511). Then, in accordance with the acquired lens information, the display unit 142 is controlled so as to superimpose and display a line indicating the direction in which the in-focus range changes on the image indicating the subject (step S604). As a result, the imager can easily determine the composition in the imaging apparatus to which the tilt lens can be attached.

  Note that the line display example in the above-described embodiment is not limited to that shown in FIG.

  FIG. 8 is a diagram for explaining another line display example for assisting composition.

  As shown in FIG. 8, both a line 701 for assisting the composition in the horizontal direction with respect to the imaging apparatus 101 and a line 702 for assisting the composition according to the rotation angle around the optical axis are simultaneously displayed. You may do it. That is, a line indicating the horizontal direction may be further displayed on the imaging apparatus 101. FIG. 8 shows an example in which the rotation angle is 45 °.

  When the rotation angle around the optical axis is changed by the imaging lens 103, the display of the line for assisting the composition in the horizontal direction does not change, but the line for assisting the composition according to the rotation angle around the optical axis. Is displayed with its rotation angle changed.

  When displaying the lines for assisting two types of compositions as described above, the display content may be changed so that the lines for assisting the respective compositions can be identified. For example, a line for assisting composition in the horizontal direction is a broken line, and a line for assisting composition according to the rotation angle around the optical axis is a solid line. Alternatively, the display color of the line for assisting composition in the horizontal direction and the display color of the line for assisting composition according to the rotation angle around the optical axis may be changed.

  Further, in the above-described embodiment, a line for assisting composition according to the rotation angle around the optical axis is displayed when the live view (through image) is displayed. However, the line as described above is not only displayed at the time of live view display but also at the time of image confirmation display for confirming an image to be recorded on an external recording medium such as a memory card (not shown) when the release button is pressed. It may be displayed superimposed on the image.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  According to the above-described embodiment, a line for assisting the composition in the horizontal direction, which is a general reference when determining the composition, is displayed. Furthermore, since a line for assisting the composition according to the rotation angle around the optical axis as a reference when the optical axis angle is set with respect to the imaging surface is displayed, the composition can be determined using both lines. . As a result, the convenience in setting the composition can be improved.

(Other embodiments)
In the above-described embodiment, since the display of the line is determined by the rotation angle around the optical axis, the line is always displayed at the determined angle when the rotation around the optical axis is constant. Then, one side of the grid-like line displayed superimposed on the through image is configured to be displayed by being rotated by the rotation angle around the optical axis. However, the composition assist line is not only rotated and displayed by the rotation angle around the optical axis with respect to the display screen of the display unit 142, but the composition assist line is not rotated. The image may be rotated and displayed.

  For example, when an operation for instructing an enlarged display is input from the user, a partial area of the through image is enlarged and displayed, and the through image is rotated and displayed by the rotation angle around the optical axis. May be. At this time, the displayed line is displayed in parallel with the through image display screen. When the optical axis angle with respect to the imaging surface is changed, the in-focus range changes along the direction parallel or perpendicular to the displayed image, so check the through image around the in-focus range. can do. When the through image is rotated and enlarged in accordance with the rotation angle around the optical axis, data at a corresponding position of the solid-state imaging device is read and displayed. Normally, the data of the solid-state image sensor is read out in the horizontal or vertical direction. However, when the rotation angle around the optical axis is not 0 °, that is, when the direction in which the optical axis angle changes is set not to be the horizontal direction of the imaging device, reading of data from the solid-state imaging device is In accordance with the rotation angle around the optical axis, the data is read obliquely.

  The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program code. To be executed. In this case, the program and the storage medium storing the program constitute the present invention.

DESCRIPTION OF SYMBOLS 101 Image pick-up device 102 Mount mechanism 103 Image pick-up lens 104 Electronic circuit board 125 Photometry part 131 Solid-state image sensor 141 Print board 142 Display 151 Release button 152,153 Operation part 161 AF range-finding display apparatus 162 Imaging condition and exposure bar display apparatus 202 , 251 Control circuit 203 Arithmetic processing circuit 204 Memory circuit 212 Switch circuit 213, 252 Operation detection circuit 253 Lens drive circuit 254 Aperture drive circuit

Claims (10)

An imaging device that can be fitted with a tilt lens and includes display means for displaying a captured image,
Acquisition means for acquiring lens information indicating a rotation angle around the optical axis in the tilt lens;
According to the rotation angle around the optical axis indicated by the lens information acquired by the acquisition unit, the line rotated from the horizontal direction or the vertical direction with respect to the imaging device is displayed so as to be superimposed on the captured image. An imaging apparatus comprising: control means for controlling display means.   The control means causes the display means to display a line indicating a horizontal direction and / or a vertical direction with respect to the imaging apparatus together with a line rotated from a horizontal direction or a vertical direction with respect to the imaging apparatus. The imaging apparatus according to claim 1. The tilt lens can change the optical axis angle relative to the imaging surface and the rotation angle around the optical axis,
The imaging apparatus according to claim 1, wherein the in-focus range can be adjusted by changing the optical axis angle so that the in-focus surface is not parallel to the imaging surface.   The imaging apparatus according to claim 3, wherein the control unit causes the display unit to display a line perpendicular to a direction in which an in-focus range changes when the optical axis angle is changed.   The control means displays a line perpendicular to a direction in which a focusing range changes when the optical axis angle is changed, by rotating the line according to a rotation angle around the optical axis. Item 5. The imaging device according to Item 4.   6. The control unit according to claim 3, wherein the control unit displays a line indicating a direction in which the in-focus range changes and a line orthogonal to the line in a grid pattern. 7. Imaging device. In response to the input of an image enlargement display instruction, the image display device includes an enlargement display unit that enlarges a partial area of the image and displays the enlarged image on the display unit.
The imaging apparatus according to claim 1, wherein the enlarged display unit displays an image rotated according to a rotation angle around the optical axis.   2. The control unit according to claim 1, wherein the control unit displays the line superimposed on the captured image when displaying a live view based on the captured image or when confirming and displaying a captured image recorded on a recording medium. Imaging device. A method for controlling an imaging apparatus, to which a tilt lens can be attached, and comprising display means for displaying a captured image,
An acquisition step of acquiring lens information indicating a rotation angle around the optical axis in the tilt lens;
In accordance with the rotation angle around the optical axis indicated by the lens information acquired in the acquisition step, the line rotated from the horizontal direction or the vertical direction with respect to the imaging device is displayed so as to be superimposed on the captured image. And a control step for controlling the display means. A program for causing a computer to execute a control method of an imaging apparatus that can be mounted with a tilt lens and includes a display unit that displays a captured image,
The control method is:
An acquisition step of acquiring lens information indicating a rotation angle around the optical axis in the tilt lens;
In accordance with the rotation angle around the optical axis indicated by the lens information acquired in the acquisition step, the line rotated from the horizontal direction or the vertical direction with respect to the imaging device is displayed so as to be superimposed on the captured image. And a control step for controlling the display means.

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