JP2011180804A - Unit and system for position detection - Google Patents

Abstract

A position detection unit and a position detection system capable of easily installing an imaging device are provided.
A first member 51 constituting a surface fastener 5 is attached to an upper surface 20t of a housing 20 of the projector 2, and the surface fastener 5 is formed on a bottom surface 30b of the housing 30 of the imaging device 3. A second member 52 is attached. For example, the first member 51 and the second member 52 are configured such that one member has a surface raised in a hook shape and the other member has a surface raised in a loop shape. And both are united by pressing each side facing each other. Further, since the hook-and-loop fastener 5 is peeled off strongly to be separated and separated, the coupling and separation can be repeated. That is, the imaging device 3 of the present embodiment is detachably fixed to the projector 2 by the surface fastener 5.
[Selection] Figure 3

Description

  The present invention relates to a position detection unit and a position detection system for detecting a position where a predetermined operation is performed in an image projected from a projector.

  In recent years, an image output from a computer is projected onto a whiteboard or the like by a projector, and the projected image (projected image) is imaged by an imaging device (camera), and a user operation performed on the projected image is performed. A system that recognizes with a computer has been proposed (see, for example, Patent Document 1). In such a system, for example, when a user indicates an arbitrary position of a projected image using a light emitting pen or a laser pointer that emits infrared light from a pen tip, the image is captured by an imaging device (captured image). Thus, the instructed position is detected. When the computer moves the cursor or pointer to the detected position or assumes that a click has been made at that position, the user can operate the projected image as if it were a touch panel. Can be done.

JP 2005-353071 A

  However, when constructing the system as described above, it is necessary to install the imaging device toward the projected image projected from the projector. However, inexperienced users are at a loss where to install the imaging device. was there. In addition, after installation of the imaging device, it is necessary to perform a procedure (calibration) for aligning the position between the projected image and the captured image. However, the positional relationship between the projector and the imaging device is necessary after calibration. If they were misplaced, they had to recalibrate.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A position detection unit according to this application example is a position detection unit for detecting a position where a predetermined operation is performed in a projection image projected from a projector, and includes a range including the projection image. An image pickup apparatus for picking up an image and a fixing member for detachably fixing the image pickup apparatus to the projector are provided.

  According to this position detection unit, since the imaging device is fixed to the projector by the fixing member, it is possible to easily install the imaging device and prevent the positional relationship between the projector and the imaging device from being shifted during use. It becomes. In addition, since the imaging device can be attached and detached, one imaging device can be used by a plurality of projectors.

  Application Example 2 In the position detection unit according to the application example, the fixing member may be a hook-and-loop fastener.

  Application Example 3 In the position detection unit according to the application example described above, the fixing member may cause the imaging device to be attracted to the projector.

  Application Example 4 In the position detection unit according to the application example, the fixing member may fix the imaging device to the projector by a magnetic force.

  Application Example 5 In the position detection unit according to the application example, the fixing member may be an adhesive sheet.

  Application Example 6 In the position detection unit according to the application example described above, the position detection unit further includes an auxiliary member attached to the projector, and the fixing member attaches and detaches the imaging device with respect to the auxiliary member attached to the projector. You may make it fix so that it is possible.

  Application Example 7 A position detection system according to this application example includes a projector, an imaging device that captures a range including a projection image projected from the projector, and an image in the projection image based on an imaging result of the imaging device. And a fixing member for removably fixing the imaging device to the projector. The detection device detects a position where a predetermined operation is performed.

  According to this position detection system, since the imaging device is fixed to the projector by the fixing member, it is possible to easily install the imaging device and to prevent the positional relationship between the projector and the imaging device from being shifted during use. It becomes. In addition, since the imaging device can be attached and detached, one imaging device can be used by a plurality of projectors.

The block diagram which shows schematic structure of a position detection system. It is a perspective view which shows a position detection system, (a) is the figure seen from the front, (b) is the figure seen from back. It is a figure for demonstrating the fixing method of an imaging device, (a) is a top view which shows the upper surface of the housing | casing of a projector, (b) is a top view which shows the bottom face of the housing | casing of an imaging device, (c). FIG. 3 is a front view showing a state where an imaging device is fixed to a projector. The front view which shows a mode that an imaging device is fixed to a projector with an adsorption member. The front view which shows a mode that an imaging device is fixed to a projector with a magnet. It is a front view which shows a mode that an imaging device is fixed to the metal fitting with which the projector was mounted | worn, (a) is a figure which shows fixation by an adsorption member, (b) is a figure which shows fixation by a magnet. The front view which shows a mode that an imaging device is fixed to a projector with metal fittings.

Hereinafter, the position detection system of this embodiment will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing a schematic configuration of a position detection system.
The position detection system 100 is a system for detecting a position where a predetermined operation is performed in an image projected from a projector. As shown in FIG. 1, a computer 1, a projector 2, an imaging device 3, The light emitting pen 4 is provided.

  The computer 1 includes a control device 10 including a CPU (Central Processing Unit), a storage device 11 such as a hard disk drive, a display device 12 such as a liquid crystal display, an input device 13 such as a keyboard, and a pointing device 14 such as a mouse and a touch pad. I have. In the computer 1, a control device 10 that operates according to an OS (Operating System) or application program stored in the storage device 11 performs various processes in accordance with user instructions made using the input device 13 or the like. The result or the like is displayed on the display device 12. The OS employed in the computer 1 of this embodiment is provided with a GUI (Graphical User Interface), and the user operates the pointer displayed on the display device 12 by using the pointing device 14. Various instructions can be given to the computer 1. Further, the computer 1 can output image information of an image displayed on the display device 12 to the outside, and outputs image information to the projector 2 in the present embodiment.

  The projector 2 refers to an image based on image information input from the computer 1, that is, an image displayed on the display device 12 of the computer 1, as a surface of a whiteboard, a wall surface, a screen or the like (hereinafter referred to as “projection plane S”). ) To enlarge and project.

  The imaging device 3 captures a range including an image projected on the projection plane S (hereinafter also referred to as “projected image”), and image information corresponding to the captured image (hereinafter also referred to as “captured image”). Is output to the computer 1 as an imaging result.

  The light-emitting pen 4 includes a pressing switch and a light-emitting diode that emits infrared light at the tip (pen tip) of a pen-shaped main body. When the user presses the pen tip of the light emitting pen 4 against the projection surface S and presses the push switch, the light emitting diode emits light.

  Based on the image information input from the imaging device 3, the control device 10 of the computer 1 determines whether or not the light-emitting pen 4 has emitted light within the projected image included in the captured image. When light is emitted, the position where the light is emitted, that is, the position where the pen tip is pressed in the projected image is detected. When the control device 10 detects the light emission position, the control device 10 performs the same processing as when the pointing device 14 is clicked at this position. That is, the user can perform the same instruction as the instruction performed by the pointing device 14 to the computer 1 by performing a predetermined operation with the light emitting pen 4 in the projected image.

  In such a position detection system 100, the position of the projected image in the captured image changes every time the positional relationship between the projector 2 and the imaging device 3 changes. Further, the projected image in the captured image is distorted due to a mismatch between the optical axis of the projection lens 21 (see FIG. 2) of the projector 2 and the optical axis of the imaging lens 31 (see FIG. 2) of the imaging device 3. This also changes each time the positional relationship between the projector 2 and the imaging device 3 changes. For this reason, after the projector 2 and the imaging device 3 are installed, it is necessary to perform calibration for matching the position between the projected image and the captured image. Calibration is performed by outputting image information of a predetermined pattern (for example, checkered pattern) from the computer 1 to the projector 2 and causing the projector 2 to project this pattern. Then, when the projected pattern is imaged by the imaging device 3 and the imaging result is output to the computer 1, the computer 1 recognizes the position and distortion of the projected image in the captured image. Then, the computer 1 can detect at which position in the projected image the light-emitting pen 4 is operated by using the recognition result.

2A and 2B are perspective views showing the position detection system 100, where FIG. 2A is a view seen from the front, and FIG. 2B is a view seen from the rear.
As shown in FIGS. 2A and 2B, the computer 1 is, for example, a notebook personal computer, and includes a display device 12, an input device 13, and a pointing device 14. . The computer 1 is not limited to a notebook personal computer. For example, a computer having a configuration in which all or part of the display device 12, the input device 13, and the pointing device 14 are externally connected, such as a desktop personal computer, or a PDA (Personal Digital Assistant) may be used. Such a portable information device may be used.

  The projector 2 has a configuration in which a light source (not shown), an image forming apparatus (not shown) that modulates light emitted from the light source to form an image, and the like are housed in the housing 20. A projection lens 21 for projecting the formed image is provided on the front surface 20 f of the housing 20. The projector 2 is arranged so that an image is projected onto a predetermined projection plane S.

  The imaging device 3 has a configuration in which an imaging element (not shown) such as a CCD (Charge Coupled Device) sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor is accommodated in a casing 30. The front surface 30f of 30 is provided with an imaging lens 31 for forming an image of light emitted from the imaging target on the imaging device. The imaging device 3 is fixed on the upper surface 20t of the housing 20 of the projector 2 so that a range including a projection image projected from the projector 2 can be captured.

3A and 3B are diagrams for explaining a fixing method of the imaging device 3, in which FIG. 3A is a plan view showing the upper surface of the housing 20 of the projector 2, and FIG. FIG. 5C is a plan view showing the bottom surface, and FIG. 5C is a front view showing how the imaging device 3 is fixed to the projector 2.
As shown in FIGS. 3A to 3C, a first member 51 constituting the hook-and-loop fastener 5 is attached to the upper surface 20 t of the housing 20 of the projector 2, and the housing 30 of the imaging device 3 is attached. A second member 52 constituting the hook-and-loop fastener 5 is attached to the bottom surface 30b. For example, the first member 51 and the second member 52 are configured such that one member has a surface raised in a hook shape and the other member has a surface raised in a loop shape. And both are united by pressing each side facing each other. Further, since the hook-and-loop fastener 5 is peeled off strongly to be separated and separated, the coupling and separation can be repeated. That is, the imaging device 3 of the present embodiment is detachably fixed to the projector 2 by the surface fastener 5.

  In addition, the hook_and_loop | surface fastener 5 is not limited to the aspect couple | bonded by the member raised in the hook shape, and the member raised in the loop shape, The hook_and_loop | surface fastener of various aspects can be used. For example, it is good also as an aspect which arranges many resin-made protrusions formed in the shape of a mushroom on both the 1st member 51 and the 2nd member 52, and makes both protrusions face each other.

  As described above, according to the position detection system 100 of the present embodiment, the imaging device 3 is used by being fixed to the projector 2 by the surface fastener 5. For this reason, the position where the imaging device 3 should be installed is easily understood, and the installation of the imaging device 3 is facilitated. Further, even if the projector 2 or the imaging device 3 is accidentally moved during use, both of them move together, so that the positional relationship between the imaging device 3 and the projector 2 does not change. That is, it is difficult to cause a situation where calibration must be performed again. Furthermore, since the imaging device 3 can be freely attached to and detached from the projector 2, if the first member 51 of the surface fastener 5 is attached to the housing 20 of the plurality of projectors 2, one imaging device 3 is attached to the plurality of imaging devices 3. The projector 2 can be used.

  In the present embodiment, the hook-and-loop fastener 5 corresponds to a fixing member, and the control device 10 of the computer 1 corresponds to a detection device. The imaging device 3 and the hook-and-loop fastener 5 for fixing the imaging device 3 to the projector 2 correspond to a position detection unit. Further, in this specification, “removable” means a state in which the user can fix (attach) or remove without using a tool such as a driver.

(Modification)
The above embodiment may be modified as follows.

  In the above embodiment, the hook-and-loop fastener 5 is used as a fixing member for detachably fixing the imaging device 3 to the projector 2, but is not limited to this aspect. For example, a pressure-sensitive adhesive sheet (not shown) that can be repeatedly bonded (fixed) and detached can be used as the fixing member.

  Further, as shown in FIG. 4, the suction member 6 provided with a suction cup is attached to the casing 30 of the imaging device 3 as a fixing member, and is detachably fixed to the casing 20 of the projector 2 by suction of the suction cup. May be. Here, if the surface of the housing 20 of the projector 2 is not smooth, the auxiliary member 60 having a smooth surface may be attached to the housing 20 of the projector 2 in advance. Thereby, the suction of the suction cup is suppressed from being weakened, and the position where the imaging device 3 should be fixed is easily understood.

  In addition, as shown in FIG. 5, a magnet 7 as a fixing member may be attached to the housing 30 of the imaging device 3 so as to be detachably fixed to the housing 20 of the projector 2 by the magnetic force of the magnet 7. . Here, when the casing 20 of the projector 2 is not a ferromagnetic body and the magnet 7 cannot be fixed, the auxiliary member 70 made of a ferromagnetic body is attached to the casing 20 of the projector 2 in advance. That's fine. This makes it possible to fix the imaging device 3 by magnetic force regardless of the material of the housing 20 and makes it easy to understand the position where the imaging device 3 should be fixed.

  In addition, the auxiliary members 60 and 70 can employ various forms. For example, as shown in FIGS. 4 and 5, a film-like or flat plate-like member that can be attached to the surface of the housing 20 of the projector 2 may be adopted, or FIGS. As shown in FIG. 5, a metal fitting that is attached to the projector 2 by screws or the like may be used. If such auxiliary members 60 and 70 are attached to the plurality of projectors 2, a plurality of sets of position detection units including the imaging device 3 and the fixing member (the attracting member 6 or the magnet 7) are provided. The projector 2 can be used. Further, even when the imaging device 3 is fixed by the hook-and-loop fastener 5 or the adhesive sheet, it may be fixed to an auxiliary member attached to the projector 2 instead of being directly fixed to the housing 20 of the projector 2. . On the other hand, as shown in FIG. 7, if the metal fitting 8 attached to the projector 2 can be attached and detached by a screw 8a that can be turned manually, the metal fitting 8 can be used as a fixing member. In this case, the imaging device 3 and the metal fitting 8 do not need to be detachable.

  In the above-described embodiment, the imaging device 3 is fixed to the upper surface 20t of the housing 20 of the projector 2, but the position where the imaging device 3 is fixed is not limited to the upper surface 20t, and other positions (for example, side surfaces). It may be. Further, when the size of the imaging device 3 is approximately the same as or larger than the size of the projector 2, the projector 2 can be placed (fixed) on the imaging device 3.

  In the above-described embodiment, a mode in which the projection image is operated using the light-emitting pen 4 that emits infrared light has been described, but the light emitted from the light-emitting pen 4 is not limited to infrared light. Moreover, it is not limited to the aspect using the light emitting pen 4, For example, it is good also as an aspect which operates by a laser pointer. Furthermore, if the computer 1 is configured to detect a human hand (finger) from the captured image, the operation can be performed without using a tool such as the light-emitting pen 4 or the laser pointer.

  DESCRIPTION OF SYMBOLS 1 ... Computer, 2 ... Projector, 3 ... Imaging device, 4 ... Light-emitting pen, 5 ... Surface fastener, 6 ... Adsorption member, 7 ... Magnet, 8 ... Metal fitting, 10 ... Control apparatus, 11 ... Memory | storage device, 12 ... Display apparatus , 13 ... input device, 14 ... pointing device, 20 ... housing, 21 ... projection lens, 30 ... housing, 31 ... imaging lens, 51 ... first member, 52 ... second member, 60, 70 ... auxiliary member, 100: Position detection system, S: Projection plane.

Claims (7)

A position detection unit for detecting a position where a predetermined operation is performed in a projected image projected from a projector,
An imaging device for imaging a range including the projected image;
A fixing member that detachably fixes the imaging device to the projector;
A position detection unit comprising: The position detection unit according to claim 1,
The position detecting unit, wherein the fixing member is a hook-and-loop fastener. The position detection unit according to claim 1,
The position detection unit, wherein the fixing member causes the imaging device to be attracted to the projector. The position detection unit according to claim 1,
The position detection unit, wherein the fixing member fixes the imaging device to the projector by magnetic force. The position detection unit according to claim 1,
The position detection unit, wherein the fixing member is an adhesive sheet. The position detection unit according to any one of claims 1 to 5,
An auxiliary member attached to the projector;
The position detection unit, wherein the fixing member detachably fixes the imaging device to the auxiliary member mounted on the projector. A projector,
An imaging device for imaging a range including a projected image projected from the projector;
A detection device that detects a position where a predetermined operation is performed in the projection image based on an imaging result of the imaging device;
A fixing member that detachably fixes the imaging device to the projector;
A position detection system comprising:

Images