JP2014102372A - Adaptor and camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support work for aligning the optical axes of a conversion lens and of the lens of optical equipment.SOLUTION: A camera system includes an adaptor attached to a conversion lens which can be attached to a lens of optical equipment. The adaptor includes a mark presentation part in which a previously set mark is arranged and a fixed part fixed to the conversion lens, so as to position the mark of the mark presentation part on the optical axis of the conversion lens.

Description

  The present invention relates to an adapter and a camera system.

In recent years, mobile phones have a built-in camera and are widely used. However, the camera lens built in this mobile phone is usually small and does not have the ability as a macro lens or telephoto.
In addition, in a projection device such as a projector, a wide lens may be desired.

  Therefore, a conversion lens that can be attached to a lens of an optical device such as a camera or a projector to enable macro photography or telephoto photography or expand the projection range of a projected image has been considered and used. Such a conversion lens is originally required to be arranged so that its optical axis coincides with the optical axis of a camera lens as a master lens or a lens of a projector.

JP 2006-045443 A

  However, since the camera lens of a mobile phone and the lens of a projector are not supposed to be attached with a conversion lens, the conversion lens can be attached while roughly aligning, or with a conversion lens and a master lens or a conversion lens. It is attached to an appropriate position while referring to an image through a projector lens, and it is difficult to accurately match the optical axes.

  For example, Patent Document 1 discloses a technique for correcting an image defect based on an optical axis mismatch between a conversion lens and a master lens later by image processing. However, according to the technique disclosed in Patent Document 1, it is assumed that the conversion lens can be screwed onto the master lens and the amount of deviation of the optical axis is always the same. In other words, this technique cannot be applied when the camera lens of a mobile phone is used as a master lens without considering the conversion lens.

  The present invention has been made in view of the above circumstances, and when attaching a conversion lens to a master lens or the like that does not consider the attachment of the conversion lens, an operation of matching the optical axes of the conversion lens and the lens of the optical device is performed. An object is to provide an adapter to be supported and a camera system including the adapter.

  The present invention that solves the problems of the conventional example is an adapter that is attached to a conversion lens that can be attached to a lens of an optical device, and includes a mark presenting portion provided with a predetermined mark, and light of the conversion lens. And a fixing portion that is fixed to the conversion lens so that the mark of the mark presenting portion is positioned on the axis.

  Further, here, a position adjusting means for changing a relative position between the optical axis of the conversion lens and the optical axis of the lens of the optical device in a state where the adapter is fixed to the lens side of the optical device may be provided.

  Furthermore, the camera system according to one aspect of the present invention is an adapter that is attached to a conversion lens that can be attached to a camera lens, the mark presenting portion having a predetermined mark disposed thereon, and an optical axis of the conversion lens. An adapter including a fixing unit that is fixed to the conversion lens so that the mark of the mark presenting unit is positioned, and a camera to which the adapter is attached, and imaging the video through the camera lens A combination unit configured to combine a predetermined image on the image portion on the optical axis of the camera lens, and a display unit configured to display the image combined by the combination unit. It is meant to be included.

  According to the present invention, when a conversion lens is attached to a master lens that does not consider the attachment of the conversion lens, the operation of matching the optical axes of the conversion lens and the master lens is supported.

It is explanatory drawing showing the outline | summary of the camera system which concerns on embodiment of this invention. It is a block diagram showing the structural example of the main-body part of the camera system which concerns on embodiment of this invention. It is a perspective view showing the example of an outline of the conversion lens in the camera system concerning an embodiment of the invention. It is the side and perspective view showing the outline | summary of the adapter in the camera system which concerns on embodiment of this invention. It is explanatory drawing showing the example of the mark which the adapter which concerns on embodiment of this invention presents. It is explanatory drawing showing the example of the image which imaged the mark which the adapter which concerns on embodiment of this invention presents. It is a schematic diagram showing the example of the fixing | fixed part in the camera system which concerns on embodiment of this invention. It is explanatory drawing showing the example of the image which the camera system which concerns on embodiment of this invention images. It is a flowchart figure showing the process example in the main-body part of the camera system which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. Below, the example applied to a camera system is demonstrated first. As illustrated in FIG. 1, the camera system according to the embodiment of the present invention includes a main body 10 including a camera lens 1 serving as a master lens, a conversion lens 2 attached to the camera lens 1, and the conversion lens. 2 and an adapter 3 fixed to 2.

  The main body 10 is a mobile phone with a camera in an example of the present embodiment. As illustrated in FIG. 2, the main body unit 10 includes a control unit 11, a storage unit 12, an operation unit 13, a display unit 14, a communication unit 15, and an imaging unit 16.

  The control unit 11 is a program control device such as a CPU, and operates according to a program stored in the storage unit 12. In an example of the present embodiment, the control unit 11 controls an imaging unit 16 described later, receives image information output from the imaging unit 16, and outputs an image represented by the image information to the display unit 14. . The operation of the control unit 11 will be described later.

  The storage unit 12 holds a program executed by the control unit 11. The program may be provided by being stored in a computer-readable recording medium such as a DVD-ROM, or may be received via the network by the communication unit 15 described later and stored in the storage unit 12. Good. The storage unit 12 also operates as a work memory for the control unit 11.

  The operation unit 13 includes a touch panel superimposed on the display unit 14, for example. The operation unit 13 may include buttons such as a numeric keypad and a cross key. The operation unit 13 outputs information representing the content of operations performed on the touch panel, buttons, and the like performed by the user to the control unit 11. The display unit 14 is a display or the like, and displays information according to an instruction input from the control unit 11.

  The communication unit 15 is a network interface or the like, and transmits information via a network to a destination instructed by the control unit 11 in accordance with an instruction input from the control unit 11. The communication unit 15 outputs information received via the network to the control unit 11.

  In accordance with an instruction input from the control unit 11, the imaging unit 16 receives an image obtained via the camera lens 1 with an optical sensor and generates electrical image information. The image information is output to the control unit 11. In the present embodiment, the imaging unit 16 controls the focal position of the camera lens 1 in accordance with an instruction input from the control unit 11.

  As illustrated in FIG. 3, the conversion lens 2 includes a fixing portion 21 and a main body portion 22 that are attached to and fixed to the camera lens 1. The fixing portion 21 may be disposed on the eyepiece side of the main body portion 22 and may be formed by forming a peelable adhesive portion on a ring-shaped member, for example. Here, the adhesive portion may be formed of, for example, silicone rubber. When the conversion lens 2 is pressed against the position where the camera lens 1 of the main body portion 10 is provided, the adhesive portion disposed on the ring-shaped member of the fixing portion 21 comes into close contact with the outer periphery of the front frame of the camera lens 1. Fixed. Further, the fixing portion 21 may be configured as a cover of the main body portion 10. In this case, the fixing portion 21 is fixed by sandwiching the main body portion 10 from the outer periphery (the fixing portion 21 is formed of an elastic material and the main body portion 10 is sandwiched using a force that contracts due to the elasticity). Is done. The alignment may be performed by elastically deforming the fixing portion 21 and aligning the position of the main body portion 22 with respect to the camera lens 1.

  The main body 22 of the conversion lens 2 is a lens barrel and incorporates an optical system such as a lens. The rotational symmetry axis of this optical system becomes the optical axis of this conversion lens 2.

  As illustrated in FIG. 4, the adapter 3 has a substantially cylindrical appearance, and includes a mark presenting portion 31 and a fixing portion 32. 4A is a side view of the adapter 3, and FIG. 4B is a perspective view as seen from the mark presenting portion 31 side. The mark presenting unit 31 is a semitransparent member in which some of the marks illustrated in FIG. 5 are drawn, and the mark is presented on the objective side of the conversion lens 2. Specifically, the mark presenting unit 31 is formed by drawing a mark illustrated in FIG. 5 on a flat plate. Here, the mark is a cross that intersects the center of the field of view (hereinafter referred to as the center of the field of view of the adapter 3) when viewed through the mark presenting unit 31 at a position corresponding to the center of the field of view. It is assumed that one point on the mark (the center of the visual field of the adapter 3) is represented.

  The fixing part 32 is, for example, a ring-shaped member that is fixed to the front frame (object side) of the conversion lens 2, and is fixed to the front frame of the conversion lens 2 by, for example, a screw. The fixing part 32 is not limited to a ring or a screw as long as the optical axis of the conversion lens 2 and the visual field center of the adapter 3 can be aligned and fixed. For example, it is good also as a structure which caulks a front frame from the outer peripheral side using a caulking ring.

  The user attaches a conversion lens 2 to the camera lens 1 and attaches an adapter 3 to the conversion lens 2. In this state, when the user gives an instruction for imaging to the main body unit 10 including the camera lens 1, the control unit 11 of the main body unit 10 receives the image information output from the imaging unit 16, and the image information is The represented image is output to the display unit 14. At this time, the imaging unit 16 acquires an image of the mark presenting unit 31 of the adapter 3 attached to the objective side of the conversion lens 2 through the conversion lens 2 and the camera lens 1, and an image representing this image Information is output to the control unit 11.

  Specifically, in the case of the disk-shaped mark illustrated in FIG. 5A, an image in which the image of the mark is blurred and spread due to the shift between the focal plane and the surface of the mark presenting unit 31 is displayed on the display unit 14. (FIG. 6A). Further, in the case of the cross-shaped mark illustrated in FIG. 5B, the image of the mark is also blurred, and a cross-shaped shading image is displayed (FIG. 6B).

  The control unit 11 includes, among pixels included in an image displayed on the display unit 14, a pixel whose color value represented by the pixel value exceeds a predetermined threshold value (a pixel whose brightness is lower than a predetermined brightness threshold value). ) Is detected. Then, the center of gravity of the position of the detected pixel (when there are a plurality of detected pixels, the position obtained by dividing the sum of the positions (x, y) of the pixels by the number N of the detected pixels) is calculated. Then, the control unit 11 sets the color of the pixel corresponding to the position of the center of gravity to a predetermined emphasized color. The user determines the position corresponding to the center of the visual field of the adapter 3 and the center of the display unit 14 (the position corresponding to the optical axis of the camera lens 1) based on the image of the mark and the position of the pixel set to the emphasized color. Are adjusted so that the conversion lens 2 is attached. The control unit 11 also performs display that emphasizes the pixel located at the center of the display unit 14, and an image indicating that the pixel and the pixel corresponding to the calculated center of gravity position coincide with each other. May be displayed. Here, the display for emphasizing the pixel located at the center of the display unit 14 may be performed by synthesizing a circular figure surrounding the pixel with an image output from the imaging unit 16.

  Another example of the adapter according to the present embodiment will be described. An adapter 3 ′ according to another example of the present embodiment is interposed between the camera lens 1 and the conversion lens 2, and the adapter 3 ′ is fixed to the camera lens 1 side. Position adjustment means for changing the relative position between the rotation target axis and the rotational symmetry axis of the camera lens 1 is provided.

  Specifically, as illustrated in FIG. 7, the adapter 3 ′ includes a first fixing portion 32 ′ and a second fixing portion 32 ′ b, a mark presenting portion 31, and an xy axis driving portion 33. Here, parts having the same configurations as those already described are denoted by the same reference numerals, and detailed description thereof is omitted. In consideration of the visibility of the drawing, the mark presenting unit 31 is indicated by a broken line together with an imaginary line representing the conversion lens 2.

  As illustrated in FIG. 7, the first fixing portion 32 ′ a includes arm portions 41 and 42 that expand and contract in directions orthogonal to each other. These arm parts 41 and 42 are urged | biased in the direction contracted in a length direction, respectively, by elastic bodies, such as a spring, for example. Each of the arm portions 41 and 42 includes a pair of rails R. The pair of rails R included in the arm portion 41 are arranged in parallel to each other, and one of the pair of rails R is provided with teeth 45 in a predetermined range in the length direction thereof, and functions as a rack. Similarly, in the arm portion 42, a pair of rails R included in the arm portion 42 are arranged in parallel with each other, and one of the pair of rails R is provided with teeth 45 in a predetermined range in the length direction thereof. Functions as a rack. The user places the main body 10 (represented by a broken line in FIG. 7) in a position where the arm is held by the arm while spreading the arms 41 and 42 in the length direction, and fixes the adapter 3 ′ to the main body 10.

  Further, the second fixing portion 32 ′ b includes a caulking ring 51, and the conversion lens 2 is fastened and fixed from the outer periphery by the caulking ring 51. The caulking ring 51 has a substantially cylindrical shape, and a convex portion P is formed on the outer periphery thereof. A pinion 46 is provided on the convex portion P, and the teeth 45 of the arm portion 42 are provided on the convex portion P as described later. Is engaged. As illustrated in FIG. 7, the xy-axis drive unit 33 has a pinion 47 provided on the arm unit 42 engaged with the teeth 45 of the arm unit 41, and is attached to the support body 52 of the second fixing unit 32 ′ b. Since the provided pinion 46 engages with the teeth 45 of the arm portion 42 and is movable, the conversion lens fixed to the second fixing portion 32 ′ b can be connected to any of two axes orthogonal to each other. It is also movable in the direction.

  The mark presentation unit 31 may be configured separately from these, or may be configured integrally with the second fixing unit 32 ′ b, and the conversion lens 2 may be formed on the objective side of the conversion lens 2. A mark representing a point on the extension line of the optical axis is presented.

  In this example, the user fixes the first fixing portion 32'a to the main body portion 10 and attaches the conversion lens 2 to the second fixing portion 32'b. Then, the user installs the mark presenting unit 31 on the objective side of the conversion lens 2 and causes the display unit 14 to display the mark image.

  And the pinion 47 of the arm part 42 and the pinion 46 of the second fixing part 32'b are arranged so that the point on the extension line of the optical axis of the conversion lens 2 represented by this mark coincides with the center of the display part 14. Is rotated to move the position of the second fixing portion 32'b. As a result, the conversion lens 2 fixed to the second fixing portion 32 ′ b can be freely moved in the plane of the main body portion 10 (x and y axis directions) with the adapter 3 ′ attached to the main body portion 10. The person changes the relative position between the point on the extension line of the optical axis of the conversion lens 2 and the center of the display unit 14 (the optical axis of the camera lens 1 as a master lens), and the optical axis of the conversion lens 2 is changed to the camera lens 1. It can be moved to a position that coincides with the optical axis. That is, the xy axis drive unit 33 functions as an example of a position adjusting unit in the present invention.

  The user again fixes the conversion lens 2 at the position after the movement with the second fixing portion 32'b, and the position of the conversion lens 2 in the z-axis direction (the conversion lens 2 and the camera lens 1 that is the master lens). May be adjusted.

  In each example described above, after the user finishes adjusting the position of the conversion lens 2, the user removes the mark presenting portion 31 of the adapter and performs actual photographing. For this reason, it is preferable that the mark presenting part 31 is detachable. About the structure which makes the mark presentation part 31 detachable, since the various well-known methods are employable, detailed description here is abbreviate | omitted.

  In addition, with respect to the image shot after the adjustment is completed in this way, the control unit 11 uses predetermined tag information as tag information indicating that the image is shot with the conversion lens 2 attached. You may record in association.

  Furthermore, as another example of the embodiment of the present invention, an example in which an adapter is not used will be described. In this example, instead of using an adapter, a predetermined pattern such as a grid line (cross hatch) in which line segments are drawn at predetermined intervals in the X-axis and Y-axis directions on the XY plane, An image is picked up by the image pickup unit 16 after the conversion lens 2 is attached.

  As an example, a case where the cross hatch pattern shown in FIG. 8 is imaged will be described. In general, when the optical axes of the camera lens 1 that is a master lens and the conversion lens 2 do not coincide with each other, coma aberration occurs in an image captured through the camera lens 1.

  The control unit 11 performs the process illustrated in FIG. That is, the control unit 11 detects the interval between the grids included in the captured grid line image (S1). Hereinafter, with the lower left corner of the cross hatch pattern as a reference, the i-th line in the X-axis direction from the reference is written as a lattice line Xi, and the j-th line in the Y-axis direction is written as a lattice line Yj. The control unit 11 detects each grid line (a method for detecting a line segment from an image is widely known, so detailed description thereof is omitted), and grid lines Xi + 1 adjacent to each other in the X-axis direction. And the distance ΔXi between Xi and Xi (S2). Similarly, the control unit 11 obtains an interval ΔYj between lattice lines Yj + 1 and Yj adjacent to each other in the Y-axis direction (S3).

  The control unit 11 compares ΔXi with ΔXi + k (k is a positive integer) (S4). Here, the control unit 11 is ΔXi <ΔXi + k (k is a positive integer), ΔXi> ΔXi + k (k is a positive integer), or ΔXi = ΔXi + k (k is a positive integer). Check out. Here, if ΔXi <ΔXi + k (k is a positive integer), the control unit 11 sets the optical axis of the conversion lens 2 to the left side of the X axis with respect to the optical axis of the camera lens 1 as a master lens. It detects that it has shifted (S5). If ΔXi> ΔXi + k (k is a positive integer), the control unit 11 shifts the optical axis of the conversion lens 2 to the right side of the X axis with respect to the optical axis of the camera lens 1 as a master lens. (S6). Further, if ΔXi = ΔXi + k (k is a positive integer), the control unit 11 matches the optical axis of the conversion lens 2 with the optical axis of the camera lens 1 as a master lens in the X-axis direction. (S7).

  Further, the control unit 11 compares ΔYj with ΔYj + k (k is a positive integer) (S8). Here, the control unit 11 is ΔYj <ΔYj + k (k is a positive integer), ΔYj> ΔYj + k (k is a positive integer), or ΔYj = ΔYj + k (k is a positive integer). Check out. If ΔYj <ΔYj + k (k is a positive integer), the control unit 11 sets the optical axis of the conversion lens 2 above the Y axis with respect to the optical axis of the camera lens 1 as a master lens. It detects that it has shifted (S9). Further, if ΔYj> ΔYj + k (k is a positive integer), the control unit 11 shifts the optical axis of the conversion lens 2 to the lower side of the Y axis with respect to the optical axis of the camera lens 1 as a master lens. (S10). Further, if ΔYj = ΔYj + k (k is a positive integer), the control unit 11 matches the optical axis of the conversion lens 2 and the optical axis of the camera lens 1 as the master lens in the Y-axis direction. (S11).

  The control unit 11 displays the determination result in the X-axis direction in the processes S5 to S7 and the determination result in the Y-axis direction in the processes S9 to S11 on the display unit 14. Specifically, this display may display an arrow indicating the direction of deviation in each of the X axis and the Y axis. The user adjusts the position of the conversion lens 2 by judging the direction of deviation of the optical axis using this arrow.

  In addition, although lattice lines are used here, not limited to lattice lines, concentric circles may be used. In this case, if the centers of the respective circles constituting the concentric circles are imaged through the conversion lens 2 and the camera lens 1 whose optical axes are shifted from each other, the larger circle moves in the direction of the optical axis shift due to coma, and the image is captured. Is done. The control unit 11 detects the direction of change of the center, detects the direction of deviation of the optical axis, and displays the direction.

  Moreover, the adapter 3 of this Embodiment may be used with the conversion lens 2 attached to the lens of projection apparatuses, such as a projector. Also in this case, the adapter 3 has the configuration illustrated in FIG. Then, the user attaches the conversion lens 2 to the projector lens, and further attaches the adapter 3 to the conversion lens 2. In this state, when the user instructs the projector to project a white screen, the light emitted from the projector is projected through the lens, the conversion lens 2 and the adapter 3 and attached to the objective side of the conversion lens 2. The image of the mark presenting part 31 of the adapter 3 is projected.

  Specifically, if the disc-shaped mark illustrated in FIG. 5A is drawn on the mark presenting unit 31, the deviation between the center of the projection range and the center of the disc-shaped mark projected through the mark presenting unit 31. Thus, the position shift of the conversion lens 2 can be known. Further, in the case of the cross-shaped mark illustrated in FIG. 5B, the positional deviation of the conversion lens 2 can be recognized by the deviation between the center of the mark image and the center of the projection range. The user aligns the conversion lens 2 while observing this shift.

  When the projector has a test pattern projection function that projects the center of the projection range or grid lines or concentric circles within the projection range, alignment is performed with the test pattern projected. May be.

  Furthermore, in the example of the present embodiment illustrated in FIG. 7, the pinions 46 and 47 (any one may be used for plural ones) are driven by the motors provided corresponding to each. Also good. In this case, the control unit 11 may control the rotation direction and the rotation amount of each motor by communication performed via the communication unit 15.

  Specifically, in this example, the control unit 11 of the main body unit 10 is rotated from the information processing apparatus such as a PC (Personal Computer) connected to the network, and the rotation direction of each motor that rotates each of the pinions 46 and 47 and An instruction relating to the rotation amount is received, and the rotation direction and rotation amount of each motor are controlled. As the motor capable of controlling the rotation direction and the rotation amount from the control unit 11 as described above, a well-known motor such as a stepping motor or a servo motor and its control circuit can be used, and detailed description thereof is omitted here.

  In the example of FIG. 7, when the pinion 46 is driven to rotate, the conversion lens 2 moves in the direction of the Y axis with the longitudinal direction of the arm portion 42 as an axis (for convenience, the Y axis). . In the example of FIG. 7, when the pinion 47 is driven to rotate, the conversion lens 2 moves in the direction of the X axis with the longitudinal direction of the arm portion 41 as an axis (for convenience, the X axis).

  Therefore, in one example, the user uses application software installed in a PC or the like, and inputs how much the movement amount of the conversion lens 2 is to be set in each of the X axis and Y axis directions. The PC sends out the input value to the main unit 10 via the network. The communication unit 15 of the main body unit 10 receives the value input by the PC and outputs it to the control unit 11.

  Based on the input information about the amount of movement in the X-axis direction and the amount of movement in the Y-axis direction, the control unit 11 rotates the pinions 46 and 47 by the number of rotations corresponding to the amount of movement in the direction corresponding to the amount of movement. Rotate the motor corresponding to each of the above. Further, the control unit 11 acquires an image received by the imaging unit 16 via the camera lens 1 at this time, and sends the image to the PC via the network.

  On the PC side that sends out the movement amount of the conversion lens 2, this image is received and presented to the user. According to this example, it is possible to adjust the position of the conversion lens 2 from the remote side (location away from the main body 10) where the PC or the like is disposed.

  Therefore, when the first user unfamiliar with the position adjustment is on the main body 10 side and the second user accustomed to the position adjustment is remotely, the first user attaches the adapter 3. In this state, the second user can be requested to adjust the position, and the second user can adjust the position by using a PC connected to the main unit 10 via the network. The position adjustment is completed (for example, if the position adjustment is completed when an instruction of the movement amount for position adjustment is not received for a predetermined threshold time, for example, 3 seconds, the control unit 11 of the main body unit 10 The first user may be notified to that effect, for example, by making a beep sound, etc.), and the first user will take the image with the adapter 3 removed. You can do that.

  DESCRIPTION OF SYMBOLS 1 Camera lens, 2 Conversion lens, 3, 3 'adapter 10, Main body part, 11 Control part, 12 Storage part, 13 Operation part, 14 Display part, 15 Communication part, 16 Imaging part, 21 Fixing part, 22 Main body part, 31 mark presenting part, 32, 32 'fixing part, 33 xy axis driving part, 41, 42 arm part, 45 teeth, 46, 47 pinion, 51 caulking ring, 52 support

Claims (3)

An adapter attached to a conversion lens that can be attached to a lens of an optical device,
A mark presenting part with a predetermined mark;
A fixing portion that is fixed to the conversion lens such that the mark of the mark presenting portion is positioned on the optical axis of the conversion lens;
With an adapter. The adapter according to claim 1,
An adapter comprising position adjusting means for changing a relative position between the optical axis of the conversion lens and the optical axis of the lens in a state where the adapter is fixed to the lens side. An adapter attached to a conversion lens that can be attached to a camera lens,
A mark presenting part with a predetermined mark;
A fixing portion that is fixed to the conversion lens such that the mark of the mark presenting portion is positioned on the optical axis of the conversion lens;
An adapter with
An camera to which the adapter is attached, an imaging unit that captures an image through the camera lens;
In the video imaged by the imaging unit, a synthesis unit that synthesizes a predetermined image with a video part on the optical axis of the camera lens;
A display unit for displaying an image synthesized by the synthesis unit;
Including camera system.

Images