JP2014116881A - Document camera and control method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly convenient document camera and a control method for the document camera in a configuration where camera lenses can be exchanged.SOLUTION: A document camera 1 of the present invention includes: a lens ID acquisition part 162a for acquiring a lens ID of a camera lens attached; an operation panel 21 for allowing a user to operate with; an initial setting part 162b for varying a setting value of at least a part of setting items among one or more initial setting items depending on the lens ID acquired by the lens ID acquisition part 162a; a UI control part 162c for varying the mode of the operation panel 21 depending on the lens ID acquired by the lens ID acquisition part 162a.

Description

  The present invention relates to a document camera that captures an image of a subject, transmits the image to an image output apparatus such as a projector, and displays the enlarged image, and a method for controlling the document camera.

  2. Description of the Related Art Conventionally, a document camera has been known to be used for transmitting image data obtained by imaging a document of about A4 size placed on a desk or a stage of the document camera to an image output device such as a projector for enlargement display ( For example, Patent Document 1). In such limited applications, a single document camera lens is sufficient.

  However, as the document camera has become widespread, it has been used in various ways. For example, at an educational site, a group of learning videos that students have written on a large imitation paper are captured and magnified, a moving image such as a pendulum is captured and magnified in a science experiment, and a video depicting a physical education class The method of enlarging and displaying an image has been used. There is also a demand for use in microscopes and astronomical observations in science experiments.

JP 2011-254280 A

  However, there is a limit to responding to these demands with a single camera lens, and it is desirable to prepare a plurality of interchangeable lenses and take an image instead of an interchangeable lens suitable for each application. However, the conventional document camera has a problem that it is necessary to perform various initial settings related to the camera lens every time the camera lens is replaced, and it is not so popular in practice. Further, when the camera lens is exchanged according to the usage, the items that can be operated by the user differ depending on the usage, but it is difficult to learn all of them.

  SUMMARY OF THE INVENTION In view of the above-described problems, an object of the present invention is to provide a highly convenient document camera and document camera control method in a configuration in which a camera lens can be replaced.

  The document camera of the present invention includes a lens ID acquisition unit that acquires a lens ID of a mounted camera lens, and a UI control unit that controls a user interface for a user to perform an operation. A feature of the user interface is variable according to the lens ID acquired by the ID acquisition unit.

  The document camera control method of the present invention executes a lens ID acquisition step of acquiring a lens ID of a mounted camera lens, and a UI control step of controlling a user interface for a user to perform an operation. In the step, the mode of the user interface is varied according to the lens ID acquired in the lens ID acquisition step.

  In the above document camera, the UI control unit varies the validity / invalidity of a predetermined function that can be operated on the user interface in accordance with the lens ID acquired by the lens ID acquisition unit.

According to the configuration of the present invention, since the lens ID of the attached camera lens is acquired and the mode of the user interface is changed in accordance with the lens ID, the convenience according to the characteristics of the camera lens and the intended use can be improved. Can provide a high user interface.
The “user interface” refers to an interface for a user to perform various operations such as a human interface device that is a physical operator, a graphical user interface (GUI) that displays a graphical operator on a display.
“Variation of the user interface mode” refers to changing the state and / or appearance (appearance) of the user interface. For example, it includes changing the validity / invalidity of a predetermined function (a predetermined function relating to a camera lens corresponding to the acquired lens ID) that can be operated by the user interface.

  In the above document camera, the user interface is an operation panel having one or more operation elements, and the UI control unit can change the validity / invalidity of each operation element according to the lens ID acquired by the lens ID acquisition unit. It is characterized by doing.

  According to the configuration of the present invention, since the validity / invalidity of each operation element is changed according to the lens ID, the operation element that does not match the characteristics of the camera lens and the intended use is set to “invalid”. Unintentional and inappropriate operations can be prevented.

  In the above document camera, one or more operators are operators with illumination, and the UI control unit can change ON / OFF of the illumination of each operator in conjunction with the validity / invalidity of each operator. It is characterized by.

  According to the configuration of the present invention, since the ON / OFF of the illumination of each operation element is changed in conjunction with the validity / invalidity of each operation element, the user can determine at a glance whether the operation element is operable. Judgment can be made.

  In the above document camera, the user interface is an operation menu screen, and the UI control unit varies operation items displayed on the operation menu screen according to the lens ID acquired by the lens ID acquisition unit. To do.

  According to the configuration of the present invention, since the operation items displayed on the operation menu screen are changed according to the lens ID, the user can hide the operation items that do not match the characteristics of the camera lens and the usage purpose. Unintentional and inappropriate operations can be prevented. Further, since the operation menu screen is used as the user interface, there is no restriction on the number of operation items and the shape of the operation element, so that a more convenient user interface suitable for various camera lenses can be provided.

  The document camera further includes an initial setting unit that performs initial setting of the document camera main body for one or more setting items, and the initial setting unit includes one or more items according to the lens ID acquired by the lens ID acquisition unit. The setting values of at least some of the setting items are variable.

  According to the configuration of the present invention, the setting values of at least some of the setting items of the document camera are changed according to the lens ID, so that it is possible to reduce time and effort for performing the initial setting suitable for the camera lens.

  In the document camera, some of the setting items include items relating to camera lens settings.

  According to the configuration of the present invention, it is possible to reduce the time and effort of the initial setting related to the camera lens. For example, an electrical signal value related to the focus, zoom, and aperture of the camera lens, the brightness (f value) of the camera lens, the imaging time of the image sensor caused by the zoom mechanism, the aperture mechanism, the shutter mechanism, and the like according to the lens ID Variable.

  The document camera further includes an illumination unit that irradiates a subject, and some setting items include items related to setting of the illumination unit.

  According to the configuration of the present invention, it is possible to reduce the labor for the initial setting related to the illumination unit. For example, it is conceivable to change ON / OFF and illuminance of each illumination light source mounted on the document camera in accordance with the lens ID.

  The document camera further includes an image processing unit that performs image processing of a captured image captured by a camera lens, and some setting items include items related to image processing parameters of the image processing unit. .

According to the configuration of the present invention, it is possible to reduce time and effort for initial setting related to image processing. For example, it is conceivable to change the correction value, dynamic range, etc. of the correction process according to the lens ID.
The correction process may include a lens distortion correction process. In this case, the initial setting unit sets a lens distortion correction parameter corresponding to the lens ID as the image processing parameter.

  In the document camera described above, the lens ID is different for each individual camera lens or measurement result of individual differences of camera lenses.

  According to the configuration of the present invention, it is possible to provide a more appropriate user interface or perform initial settings in consideration of individual differences of camera lenses.

  In the document camera, a display unit that displays at least one information among a lens ID, a lens type corresponding to the lens ID, a use application corresponding to the lens ID, and a handling content of the camera lens corresponding to the lens ID. Is further provided.

  According to the configuration of the present invention, it is possible to notify the user of the lens ID, lens type, usage, and handling contents (guide contents or help contents) of the mounted camera lens.

It is a side view of the document camera which concerns on one Embodiment of this invention. (A) is a side view of the document camera when a still image lens is mounted, and (b) is a side view of the document camera when a moving image lens is mounted. (A) is a side view of the document camera when the astronomical observation telephoto lens is mounted, and (b) is a side view of the document camera when the microscope lens unit is mounted. It is a block diagram of a document camera when a still image lens is attached. FIG. 4 is a block diagram of a document camera when a moving image lens is attached. (A) is explanatory drawing of barrel type distortion correction processing, (b) is explanatory drawing of pincushion distortion correction processing. (A) is explanatory drawing of a lens distortion and trapezoid distortion correction process, (b) is explanatory drawing of the trapezoid distortion correction process 1. FIG. (A) is explanatory drawing of the trapezoid distortion correction process 2, (b) is explanatory drawing of the trapezoid distortion correction process 3. FIG. It is a top view which shows an example of the operation panel at the time of mounting | wearing with the lens for still images. It is a top view which shows an example of the operation panel at the time of mounting | wearing with the lens for moving images. It is a flowchart which shows the flow of operation | movement of a document camera. It is a side view of a document camera with a stage. It is a figure which shows an example of the operation menu screen at the time of mounting | wearing with the lens for still images. It is a figure which shows an example of the operation menu screen at the time of mounting | wearing with the lens for moving images.

  Hereinafter, the document camera and the document camera control method of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view schematically showing a document camera 1 according to an embodiment of the present invention. The document camera 1 includes a box-shaped housing 11, an arm member 12 extending upward from the housing 11, and a camera head 13 attached to the upper end of the arm member 12. An operation panel 21 (see FIGS. 9 and 10) on which a plurality of operation buttons are arranged is provided on the upper surface of the housing 11. Each operation button incorporates a backlight, and only the operation button with the backlight ON can be operated.

  The arm member 12 includes an upper arm 12a and a lower arm 12b, and three connecting portions 12c, 12d, and 12e disposed on the upper and lower ends of the upper arm 12a and the lower end of the lower arm 12b, respectively. Inside the arm member 12, a signal line (not shown) for electrically connecting the casing 11 (control board) and the camera head 13 is accommodated. The signal line is used for control signal transmission and power supply.

  The camera head 13 is configured to be rotatable in the axial direction (A direction in the drawing) and the vertical direction (B direction in the drawing) with respect to the upper arm 12a by the connecting portion 12c. Further, the upper arm 12a is configured to be rotatable in the vertical direction (C direction in the figure) with respect to the lower arm 12b by the connecting portion 12d. Further, the lower arm 12b is configured to be rotatable in the left-right direction (D direction in the figure) and the up-down direction (E direction in the figure) with respect to the housing 11 by the connecting part 12e. The user points the camera head 13 toward the subject M and performs imaging by adjusting the angles of the connecting portions 12c, 12d, and 12e.

  The camera head 13 includes a camera lens L that images the subject M, and an LED lamp 26 that irradiates the subject M. The camera lens L is configured to be detachable from a lens mount (not shown) of the camera head 13 so that the camera lens L can be exchanged according to the usage. On the other hand, the main body (control board) of the document camera 1 reads the lens ID assigned to each camera lens L through the signal interface of the lens mount, and determines the lens type according to the read result. . Then, according to the determined lens type, various initial settings (lens setting, illumination setting, image processing setting, etc.) and control of the operation panel 21 (ON / OFF control of the backlight provided for each operation button) are performed. . Details will be described later.

  Next, referring to FIG. 2 and FIG. 3, examples of mounting various lenses will be described. FIG. 2A is a diagram illustrating a mounting example of the still image lens La. The still image lens La is used for imaging a stationary object such as a document. Also, a normal lens and a wide-angle lens are distinguished, and the latter is used when imaging a relatively large subject M such as A1.

  FIG. 2B is a diagram illustrating a mounting example of the moving image lens Lb. The moving image lens Lb is used for imaging a moving object such as a science experiment or a physical education class. Although not particularly shown, a mechanical shutter for capturing a high frame rate moving image with high image quality, and a diaphragm mechanism and a zoom mechanism that are assumed to be used in a gymnasium or school yard are provided.

  FIG. 3A is a diagram showing an example of mounting the astronomical observation telephoto lens Lc. The astronomical observation telephoto lens Lc is used for observation of astronomical objects such as the moon and constellations. When the astronomical observation telephoto lens Lc is attached, the LED lamp 26 is not used because of telephoto.

  FIG. 3B is a diagram showing an example of mounting the microscope lens unit LU. The microscope lens unit LU is used for photographing minute objects and includes an upper unit 27 and a lower unit 28. On the lower surface of the upper unit 27 (on the lower unit 28 side), a microscope close-up lens Ld and a direct illumination LED lamp 27a are provided. The upper surface of the lower unit 28 is used as a placement surface 28a on which the subject M is placed, and an LED lamp 28b for indirect illumination is embedded in the placement surface 28a. In the example of the figure, the case where the old camera lens L and the LED lamp 26 are removed from the camera head 13 and the microscope lens unit LU is attached is shown. However, the microscope lens is left with the LED lamp 26 left. The unit LU may be attached. In this case, the LED lamp 26 may be usable or unusable.

  Next, the functional configuration of the document camera 1 will be described with reference to FIGS. 4 and 5. FIG. 4 is a block diagram when the still image lens La is mounted. The document camera 1 includes an interchangeable lens unit 110, an illumination unit 120, an imaging unit 130, an operation unit 140, a signal input / output unit 150, and a control processing unit 160 as main functional configurations.

  The interchangeable lens unit 110 includes a lens ID storage unit 111 and a lens driving unit 112. The lens ID storage unit 111 stores a lens ID for specifying a lens type (“still image / standard”, “still image / wide angle”, etc.) in an IC chip or the like. Further, the lens driving unit 112 performs variable driving of the lens position in order to perform focusing, zooming, and the like.

  The illumination unit 120 includes an illumination module 121. The illumination module 121 has a lamp driving mechanism (not shown) for driving the LED lamp 26 as a main part. The lamp driving mechanism is controlled by a control unit 162 (initial setting unit 162b) described later.

  The imaging unit 130 includes an imaging module 131. The imaging module 131 mainly includes an imaging sensor (not shown) such as a complementary metal oxide semiconductor (CMOS) sensor or a charge coupled device (CCD) sensor. A plurality of light receiving pixels arranged in a matrix are formed on the light receiving surface of the image sensor, and the imaging unit 130 generates imaging data based on the amount of light received by each pixel at a predetermined frame rate, and a control unit It outputs to 162.

  The operation unit 140 includes the operation panel 21. The operation panel 21 has a plurality of operation buttons (operators) for performing imaging settings, illumination settings, input / output settings, and the like (see FIGS. 9 and 10). Further, the operation panel 21 is provided with a backlight (illumination) drive mechanism for each operation button, and drive control is performed by a control unit 162 (UI control unit 162c) described later.

  The signal input / output unit 150 includes an input terminal 151 and an output terminal 152. The input terminal 151 inputs a video signal from an SD memory card or a PC (personal computer). The output terminal 152 outputs a video signal (image data captured by the image capturing unit 130) to a projector, a monitor, a PC, or the like.

  The control processing unit 160 includes a storage unit 161, a control unit 162, and an image processing unit 163. The storage unit 161 is configured by a nonvolatile memory and stores various control data and control programs. As the control data, a control table in which an initial setting value and an operation button backlight drive value (ON / OFF) are associated with each lens ID is stored. In addition, as a control program, an initial setting program for performing initial setting according to the lens ID and a UI control program for performing backlight control according to the lens ID are stored.

  The image processing unit 163 performs a geometric correction process and an image quality adjustment process on the captured image captured by the imaging unit 130 (camera lens L). Examples of the geometric correction process include a trapezoidal distortion correction process and a lens distortion correction process. The trapezoidal distortion correction process refers to a process for correcting image distortion (trapezoidal distortion) that occurs when the subject M does not face the incident imaging direction of the camera lens L. The trapezoidal distortion correction process and the lens distortion correction process will be described in detail later. Further, as the image quality adjustment processing, brightness adjustment processing, color correction processing, and the like are performed.

  The control unit 162 controls each unit in the document camera 1 and includes a lens ID acquisition unit 162a, an initial setting unit 162b, and a UI control unit 162c. The lens ID acquisition unit 162a acquires a lens ID from the interchangeable lens unit 110 (lens ID storage unit 111) when the document camera 1 is powered on or when the camera lens L is replaced.

  The initial setting unit 162b varies initial setting values such as lens setting, illumination setting, and image processing setting according to the acquired lens ID. Here, the lens setting refers to a setting relating to the camera lens L, and the setting value includes an electric signal value relating to the focus, zoom and diaphragm of the camera lens L, the brightness (f value) of the camera lens L, a zoom mechanism, The imaging time of the image sensor due to the aperture mechanism, shutter mechanism, etc. is set. The illumination setting refers to the setting of the illumination unit 120, and the set value is set to ON / OFF of the LED lamp 26 and illuminance. The image processing setting refers to the setting of the image processing unit 163, and the setting value is a correction value or dynamic range of the image correction processing. The image processing unit 163 performs image processing based on these image processing parameters (correction value and dynamic range of image correction processing).

  The UI control unit 162c performs control to enable / disable each operation button of the operation panel 21 and switch the backlight ON / OFF provided in each operation button according to the acquired lens ID. Specifically, the backlight of the operation button that can be operated is turned on and the backlight of the operation button that cannot be operated (no operation is required) is turned off in accordance with the intended use determined for each lens ID (lens type). .

  FIG. 5 is a block diagram when the moving image lens Lb is mounted. When the moving image lens Lb is attached, compared to the case where the still image lens La shown in FIG. 4 is attached, a shutter mechanism driving unit 113 and an aperture mechanism driving unit 114 are added in the interchangeable lens unit 110. It has a configuration. The shutter mechanism driving unit 113 and the aperture mechanism driving unit 114 are controlled by the control unit 162.

  The shutter mechanism driving unit 113 drives a mechanical shutter for high frame rate imaging. The diaphragm mechanism drive unit 114 drives the diaphragm mechanism so that it can be used both outdoors for schoolyards and indoors such as classrooms and gymnasiums. The other parts are the same as those when the still image lens La is mounted, and thus the description thereof is omitted.

  Although not particularly illustrated, when the astronomical observation telephoto lens Lc is used, a diaphragm for adjusting the brightness in the interchangeable lens unit 110 as compared with the case where the still image lens La illustrated in FIG. 4 is mounted. It is desirable to add a mechanism drive unit. Further, a zoom mechanism for changing the magnification may be added.

  Further, when the microscope lens unit LU is used, a configuration in which an illumination unit and a diaphragm mechanism driving unit are added in the interchangeable lens unit 110 as compared with the case where the still image lens La shown in FIG. 4 is mounted. Is desirable. The illumination unit includes an illumination module for the direct illumination LED lamp 27a and an illumination module for the indirect illumination LED lamp 28b (see FIG. 3B). The initial setting unit 162b of the control unit 162 performs ON / OFF of the direct illumination LED lamp 27a and the indirect illumination LED lamp 28b and illuminance setting according to the acquired lens ID.

  The microscope lens unit LU may include a plurality of camera lenses L. For example, a plurality of close-up lenses (objective lenses) may be provided on the revolver (not shown) of the upper unit 27, and the lens may be switched by rotating the revolver. In this case, it is desirable that a lens ID is assigned for each camera lens L (for each magnification). Also, in this case, the microscope lens unit LU side detects the rotation of the revolver (the user has switched the camera lens L), notifies the control unit 162 of this, and the control unit 162 uses the lens as a trigger. It is good also as a structure which acquires ID. That is, on the microscope lens unit LU side, the lens ID stored in the lens ID storage unit may be rewritten or the lens ID storage unit to be read may be changed every time the lens is switched.

  Alternatively, when N lenses are provided in the microscope lens unit LU, the control unit 162 obtains N lens IDs at the time of initial initialization (when the microscope lens unit LU is mounted or when the power is turned on). It is good also as composition to keep. In this case, the control unit 162 may detect the rotation of the revolver and specify the lens ID of the lens being used according to the amount of rotation. When a plurality of camera lenses L are provided in the microscope lens unit LU, an initial setting process is performed every time the camera lens L is switched.

  Next, image processing by the image processing unit 163 and initial setting by the initial setting unit 162b will be described with reference to FIGS. The upper part of FIG. 6A shows an image of barrel distortion that occurs on the short-angle side of the wide-angle lens or zoom lens. On the other hand, the image processing unit 163 performs lens distortion correction processing as shown in the middle part of FIG. Thereafter, a corrected image 93 can be obtained by performing a clipping process as shown in the lower part of FIG. In this case, the initial setting unit 162b reads a lens distortion (barrel distortion) correction parameter corresponding to the lens ID from the storage unit 161 (control table), and performs an initial setting of the lens distortion correction process based on the correction parameter. .

  On the other hand, the upper part of FIG. 6B shows an image of pincushion type distortion that occurs on the longer focal length side of the zoom lens and is opposite to the barrel type. On the other hand, the image processing unit 163 performs lens distortion correction processing as shown in the middle part of FIG. Thereafter, a corrected image 93 can be obtained by performing a clipping process as shown in the lower part of FIG. Also in this case, the initial setting unit 162b performs the initial setting of the lens distortion correction process based on the lens distortion (pin cushion type distortion) correction parameter corresponding to the lens ID.

  FIG. 7A shows the flow of image processing when both lens distortion correction and trapezoidal distortion correction are performed. The trapezoidal distortion correction is based on the premise that the subject M is a rectangle having a predetermined aspect ratio. The upper part of the figure shows an image of barrel distortion that occurs on the short-angle side of the wide-angle lens or zoom lens, and the shape (reference numeral 90) of the subject M imaged by the camera lens L. On the other hand, the image processing unit 163 performs lens distortion correction processing as shown in the middle part of FIG. Thereafter, a corrected image 93 can be obtained by performing trapezoidal distortion correction processing as shown in the lower part of FIG.

  Here, the trapezoidal distortion correction processing calculates a trapezoidal distortion correction value from the distance from the camera lens L to the subject M and the inclination of the camera lens L with respect to the subject M (the plane on which the subject M is placed). For example, assuming a trapezoidal distortion in only one direction, up and down or left and right, as shown in “trapezoidal distortion correction processing 1” in FIG. 7B, a vertical line position 92 lowered from the camera lens L in the vertical direction is used as a reference. The aspect ratio is corrected, and a trapezoidal distortion correction value is calculated based on the correction amount. Further, the initial setting unit 162b performs initial setting of the trapezoidal distortion correction process based on the trapezoidal distortion correction value. With this method, it is possible to perform the trapezoidal distortion correction process without detecting the frame of the subject M. Further, the distance from the camera lens L to the subject M and the inclination of the camera lens L with respect to the subject M are detected by detecting the angles of the connecting portions 12c, 12d, and 12e of the camera head 13 or the arm member 12 with an angle sensor or the like. You may obtain | require from a detected value. Further, when the arm member 12 (the upper arm 12a and / or the lower arm 12b) is configured to be extendable / contracted, the distance and the inclination may be obtained in consideration of the expansion / contraction rate.

  On the other hand, FIG. 8 is an explanatory diagram when the trapezoidal distortion correction process is performed by detecting the frame of the subject M. For example, as shown in “trapezoidal distortion correction processing 2” in FIG. 6A, the corrected image is detected by detecting the frame 91 of the subject M and adjusting the aspect ratio to a specified value by partial enlargement correction processing. 93 can be obtained. In this case, the trapezoidal distortion correction value is calculated based on the correction position and correction amount of the partial enlargement correction processing.

  Further, as shown in “trapezoidal distortion correction processing 3” in FIG. 5B, a frame 91 of the subject M is detected, and partial reduction correction processing is performed to generate a corrected image 93a having an arbitrary aspect ratio. To do. Thereafter, the final corrected image 93b can be obtained by further performing overall enlargement correction processing and adjusting the aspect ratio to a specified value. In this case, the trapezoidal distortion correction value is calculated based on the correction position and correction amount of the partial reduction correction process and the correction amount of the overall enlargement correction process.

  In the above example, the keystone distortion correction value is calculated according to the state of the document camera 1 (distance and parallelism between the camera head 13 and the subject M), and the keystone distortion correction processing is performed based on the keystone distortion correction value. However, the trapezoidal distortion correction value calculation method may be varied according to the lens ID (lens type). That is, the trapezoidal distortion correction parameter (image processing parameter) corresponding to the lens ID is stored in the control table, the trapezoidal distortion correction value calculated according to the state of the document camera 1, and the trapezoid corresponding to the lens ID. Trapezoidal distortion correction processing may be performed according to the distortion correction parameter. According to this configuration, more appropriate trapezoidal distortion correction processing can be performed according to the characteristics of the camera lens L.

  Next, control of the operation panel 21 by the UI control unit 162c will be described with reference to FIG. 9 and FIG. FIG. 9 is a diagram illustrating a mode of the operation panel 21 when the still image lens La is mounted, and FIG. 10 is a diagram illustrating a mode of the operation panel 21 when the moving image lens Lb is mounted. In both figures, an operation button with a hatch line indicates that the backlight is lit, that is, an operation button that can be operated.

  As shown in both figures, the operation panel 21 includes a power button 31, up / down / left / right cursor buttons 32, a menu button 33 for displaying an on-screen menu 50 (see FIGS. 13 and 14), In addition to the function end and the Esc button 34 for returning the menu level to the next higher level, it has a camera setting area 35, an illumination setting area 36, a data setting area 37, and an output setting area 38.

  The camera setting area 35 includes a Shot button 41 for capturing an image, a Save button 42 for storing a captured still image, a Focus button 43 for performing automatic focusing, and enlarging / magnifying an image without changing the image output size. A Zoom button 44 for reducing the size and a Bright button 45 for adjusting the brightness of the image are included.

  The illumination setting area 36 includes the direct illumination LED lamp 27a and the indirect illumination LED lamp 28b, such as when an On / Off button 46 for switching on / off the LED lamp 26 and a microscope lens unit LU are used. The configuration includes an F / R button 47 for switching an operation target and a Bright button 48 for adjusting the brightness (illuminance) of illumination light.

  The data setting area 37 includes a Cam button 51, a Memory button 52, and a USB button 53 for switching the data input source to the camera head 13, the SD memory card, and the PC, respectively. The output setting area 38 includes an HDMI button 55, a VGA button 56, and a USB button 57 for switching the data output destination to an HDMI compatible device, a VGA compatible device, and a USB compatible device (PC), respectively.

  As shown in FIG. 9, when the still image lens La is mounted, among the above-described operation buttons, the backlight of the Zoom button 44 is turned off, and the operation becomes impossible. This is because the zoom mechanism is not incorporated in the still image lens La. On the other hand, as shown in FIG. 10, when the moving image lens Lb is attached, among the above-described operation buttons, the backlights of the On / Off button 46, the F / R button 47, and the Bright button 48 in the illumination setting area 36 are displayed. Turns off and operation is disabled. This is because the moving image lens Lb is premised on far-distance shooting and does not require illumination.

  Next, the operation flow of the document camera 1 will be described with reference to the flowchart of FIG. When the document camera 1 (control unit 162) acquires the lens ID when the power is turned on or the camera lens L is exchanged (S01), the document camera 1 (control unit 162) performs initial setting according to the lens ID (S02) and UI corresponding to the lens ID. Variable control (backlight control of the operation panel 21) is performed (S03). Further, the connection cable connected to the output terminal 152 is confirmed and set (S04). Specifically, in the output setting area 38 of the operation panel 21, it is confirmed which operation button is selected, and the resolution and frame rate of the video signal to be output are set. For example, when the HDMI button 55 is selected, the image is output at a resolution of 1080 × 1920 and 30 fps. When the VGA button 56 is selected, the image is output at XGA resolution and 30 fps.

  Thereafter, various settings and processes are performed based on the user operation (S05), and it is determined whether or not the lens has been exchanged (S06). If the lens has been replaced (S06: Yes), the process returns to S01. If the lens has not been replaced (S06: No), it is determined whether or not a power-off operation has been performed. If the power-off operation has been performed (S07: Yes), the series of operations is terminated. To do. If the power OFF operation is not performed (S07: No), the process returns to S04.

  As described above, according to the document camera 1 according to the present embodiment, the lens ID of the attached camera lens L is acquired, and the backlight control of the operation panel 21 is performed according to the lens ID (can be used). Since only the backlight of the operation button is turned on), it is possible to provide a convenient user interface suitable for the characteristics of the camera lens L and the intended use. That is, by disabling the operation of the operator that does not match the characteristics of the camera lens L and the intended use, it is possible to prevent the user from performing an unintended operation unintentionally. Further, since the backlight ON / OFF is varied in conjunction with the validity / invalidity of the operation button, the user can determine at a glance whether or not the operation is possible.

  In addition, since the initial setting process is performed according to the acquired lens ID, it is possible to reduce the time and effort for the user to manually perform the initial setting every time the camera lens L is replaced. Further, as the initial setting, the setting of the camera lens L, the setting of the illumination unit 120, and the automatic setting of the image processing unit 163 are performed, so that various troublesome settings that are indispensable for the use of the document camera 1 can be omitted.

[Modification 1]
In the above embodiment, the stageless document camera 1 is illustrated as the document camera 1 (see FIG. 1), but the present invention may be applied to the staged document camera 1. As shown in FIG. 12, the document camera 1 with a stage has a configuration in which a housing 11 portion extends and is used as a stage table on which a subject M is placed, as compared with the document camera 1 without a stage. An operation panel 21 is disposed on the upper surface of the housing 11 in the vicinity of the mounting position of the arm member 12, and an LED lamp 22 that irradiates the subject M from below is embedded in the vicinity of the mounting position of the subject M. ing. The LED lamp 22 is used as a transmission illumination member. When such a document camera with stage 1 is used, the initial setting unit 162b performs ON / OFF setting and illuminance setting for each of the LED lamps 22 and 26 as illumination settings.

  In the case of the document camera 1 with a stage, a calibration mark may be printed on the stage, and the lens distortion correction process and the trapezoidal distortion correction process may be performed based on the imaging result of the calibration mark. According to this configuration, it is possible to perform more appropriate initial setting in consideration of individual differences of the camera lens 1.

[Modification 2]
In the above embodiment, the backlight control of the operation panel 21 is exemplified as the UI variable control. However, the mode of the on-screen menu 50 displayed when the menu button 33 on the operation panel 21 is pressed is changed. Also good. FIG. 13 is a diagram showing an aspect of the operation menu screen 60 displayed as the on-screen menu 50 when the still image lens La is attached. FIG. 14 shows the on-screen menu 50 when the moving image lens Lb is attached. It is a figure which shows the aspect of the operation menu screen 60 displayed as FIG. In both figures, an icon 91 corresponds to the power button 31 on the operation panel 21 in FIGS. 9 and 10, and areas 95 to 98 are a camera setting area 35, an illumination setting area 36, and a data setting area 37, respectively. And the output setting area 38. Also, icons 61 to 65 correspond to the Shot button 41, Save button 42, Focus button 43, Zoom button 44, and Bright button 45 on the operation panel 21, and icons 66 to 68 represent On / Off buttons 46. , F / R button 47 and Bright button 48. The icons 71 to 73 correspond to the Cam button 51, the Memory button 52, and the USB button 53 on the operation panel 21, and the icons 75 to 77 correspond to the HDMI button 55, the VGA button 56, and the USB button 57. doing.

  As shown in FIGS. 13 and 14, the operation menu screen 60 does not display inoperable icons. For example, the Zoom icon 64 (see FIG. 13) when the still image lens La is attached and the illumination setting area 96 (see FIG. 14) when the moving image lens Lb is attached are not displayed. As described above, since icons (operation items) displayed on the on-screen menu 50 (operation menu screen 60) are changed according to the lens ID, it is possible to prevent the user from performing an unintended operation unintentionally. Further, by using the on-screen menu 50 as a user interface, there is no limitation on the number of operation items and the shape of the operation element, so that a more convenient user interface suitable for various camera lenses can be provided. It should be noted that an inoperable icon may not be hidden, but may be other modes such as graying out.

[Modification 3]
In the above embodiment, each camera lens L is assigned a lens ID corresponding to the lens type. However, a lens ID may be assigned to each individual camera lens L. In this case, information on individual differences of the camera lens L (still image lens, barrel distortion correction parameter “***”, etc.) is stored as a lens ID on the camera lens L side, and the body of the document camera 1 ( The control unit 162) may read this and perform initial setting processing and UI variable control according to the lens ID.

  Alternatively, the category ID corresponding to the measurement result of the individual difference of the camera lens L is stored as the lens ID on the camera lens L side, and the document camera 1 main body performs initial setting processing and UI variable control according to the category ID. May be performed. In this case, the storage unit 161 stores an initial setting value for each category ID and a control table indicating the driving value of the operation button backlight (ON / OFF).

  In addition, the control table is stored in an external server (such as a cloud computing server) or an external storage medium that can be referred to from the document camera 1, and the control table is referred to as the lens ID is acquired, and the reference result is obtained. The initial setting process and UI variable control may be performed based on the above. According to these configurations, it is possible to provide a more appropriate user interface or perform initial setting in consideration of individual differences of the camera lens L.

[Other variations]
In addition, the following modifications can be employed.
In the above embodiment, the initial setting process and the UI variable control are performed according to the lens ID. However, in addition to the lens ID, the angle of each of the connecting portions 12c, 12d, and 12e (at least one of the plurality of connecting portions). The initial setting process and UI variable control may be performed according to the angle of the connecting portion. Further, when the arm member 12 is configured to be extendable / contractable, these processes and controls may be performed according to the expansion / contraction ratio. According to this configuration, it is possible to perform more appropriate initial setting and UI variable control according to the usage situation.

  Regardless of the lens ID, the initial setting process and UI variable control are performed according to the orientation of the camera head 13 (the angle of the connecting portion 12c or the detection value of an angle sensor or a parallelism sensor attached to the camera head 13). You can go. For example, when the camera head 13 is directed to the front instead of the lower side (see FIG. 2B), it is conceivable to use the document camera 1 as a Web camera, so the LED lamp 26 is turned off as an initial setting. In addition, control such as disabling the operation of the illumination setting area 36 (turning off the backlight) can be considered.

  In the above-described embodiment, the backlight control of the operation panel 21 is performed according to the acquired lens ID. However, since the operation panel 21 that does not include the backlight is also conceivable, in this case, the lens A configuration may be adopted in which only the validity / invalidity of the operation button is switched according to the ID. In addition, the validity / invalidity of a predetermined function related to the corresponding camera lens may be changed according to the acquired lens ID. The “predetermined function” refers to various functions that can be operated by the user interface such as the operation panel 21 and the on-screen menu 50, and the following “guide function”, “help function”, “lock mechanism”, “blur”. It is a concept that includes a “prevention function”.

  Further, when the on-screen menu 50 is displayed as a user interface as in the second modification and the on-screen menu 50 is provided with a guide function or a help function, these guide contents and help contents are obtained from the acquired lens. You may vary according to ID. In addition, the acquired lens ID itself may be displayed, or the type of camera lens corresponding to the lens ID, its usage, and the like may be displayed (display unit).

  Further, the operation menu 51 may not be displayed as the on-screen menu 50 but may be displayed on a touch panel (not shown) mounted on the document camera 1. In this case, the “user interface” in the claims is a touch panel. Further, when the PC is connected (wired connection or wireless connection) and the document camera 1 can be operated by the PC, the operation menu 51 may be displayed on the PC display. In this case, the “user interface” in the claims is the operation menu 51 displayed on the display of the PC. In addition, a tablet terminal such as a smartphone or a terminal with a display function such as a mobile phone may be connected to the document camera 1 to display the operation menu 51 on the display of the terminal with the display function.

  Further, the document camera 1 may be provided with a lock mechanism for preventing the camera head 13 from blurring and a lock control unit that varies the validity / invalidity of the lock mechanism according to the acquired lens ID. For example, when the still image lens La is mounted, the lock mechanism is “invalid”, and when the other moving image lens Lb, the astronomical observation telephoto lens Lc, and the microscope lens unit LU are mounted, the lock mechanism is “enabled”. And so on. In addition to the validity / invalidity of the lock, an anti-blur function at the time of imaging (camera shake correction function mounted on a digital camera or the like) and an anti-blur control unit that varies the validity / invalidity of the anti-blur function are provided. Similarly to the lock mechanism control, the validity / invalidity of the anti-shake function may be varied according to the acquired lens ID.

  Moreover, it is possible to provide each component of the document camera 1 shown in said embodiment and each modification as a program. Further, the program can be provided by being stored in various recording media (CD-ROM, flash memory, etc.). That is, a program for causing a computer to function as each component of the document camera 1 and a recording medium on which the program is recorded are also included in the scope of the present invention. Other modifications can be made as appropriate without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Document camera 11 ... Case 12 ... Arm member 13 ... Camera head 21 ... Operation panel 22, 26 ... LED lamp 27 ... Upper unit 27a ... LED lamp for direct illumination 28 ... Lower unit 35 ... Camera setting area 36 ... Illumination setting Area 37 ... Data setting area 38 ... Output setting area 50 ... On-screen menu 60 ... Operation menu screen 91 ... Subject frame 92 ... Perpendicular position 93 ... Corrected image 110 ... Interchangeable lens part 120 ... Illumination part 130 ... Imaging part 140 Operation unit 150 Signal input / output unit 160 Control processing unit 161 Storage unit 162 Control unit 162a Lens ID acquisition unit 162b Initial setting unit 162c UI control unit 163 Image processing unit L Camera lens LU Microscope Lens unit La ... Still image lens Lb ... Lens for moving image Lc ... Telephoto lens for astronomical observation Ld ... Close-up lens for microscope M ... Subject

Claims (12)

A lens ID acquisition unit for acquiring the lens ID of the attached camera lens;
A UI control unit that controls a user interface for a user to perform an operation,
The document camera according to claim 1, wherein the UI control unit changes a mode of the user interface according to the lens ID acquired by the lens ID acquisition unit.   The UI control unit varies the validity / invalidity of a predetermined function operable on the user interface according to the lens ID acquired by the lens ID acquisition unit. Document camera. The user interface is an operation panel having one or more operators.
The document camera according to claim 1, wherein the UI control unit varies the validity / invalidity of each operation element according to the lens ID acquired by the lens ID acquisition unit. The one or more operators are illuminated operators,
4. The document camera according to claim 3, wherein the UI control unit is configured to change ON / OFF of lighting of each operation element in conjunction with validity / invalidity of each operation element. The user interface is an operation menu screen,
The document camera according to claim 1, wherein the UI control unit changes an operation item displayed on the operation menu screen in accordance with the lens ID acquired by the lens ID acquisition unit. An initial setting unit for performing initial setting of the document camera body for one or more setting items is further provided,
2. The initial setting unit varies a setting value of at least a part of the one or more setting items according to the lens ID acquired by the lens ID acquisition unit. 6. The document camera according to any one of items 5 to 5.   The document camera according to claim 6, wherein the part of the setting items includes an item related to setting of the camera lens. It further includes an illumination unit that illuminates the subject,
The document camera according to claim 6 or 7, wherein the part of the setting items includes an item related to the setting of the illumination unit. An image processing unit that performs image processing of a captured image captured by the camera lens;
9. The document camera according to claim 6, wherein the part of the setting items includes an item related to an image processing parameter of the image processing unit.   10. The document camera according to claim 1, wherein the lens ID is different for each individual camera lens or for each individual measurement result of the camera lens.   It further includes a display unit for displaying at least one of the lens ID, the lens type corresponding to the lens ID, the use application corresponding to the lens ID, and the handling contents of the camera lens corresponding to the lens ID. The document camera according to claim 1, wherein: A lens ID acquisition step of acquiring the lens ID of the attached camera lens;
Executing a UI control step for controlling a user interface for a user to perform an operation;
In the UI control step, the mode of the user interface is changed in accordance with the lens ID acquired in the lens ID acquisition step.

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