JP2015158891A - Position detecting device and adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detecting device capable of further suppressing noise.SOLUTION: A position detecting device comprises: an irradiation part for irradiating light for detecting a position of an indication body along an image projected on a projection surface by image light projected by a projection part; an acquisition part for acquiring information with respect to size of the image; and an adjustment part for adjusting output of the irradiation part on the basis of the information acquired by the acquisition part.

Description

  The present invention relates to a position detection device and an adjustment method.

  Conventionally, the position of the object is determined by irradiating curtain-like light substantially parallel to the projection plane on which the projection image projected by the projection unit is displayed, and imaging the light reflected by the object approaching the projection plane. An apparatus for detection is known (see Patent Document 1).

Japanese Patent No. 5015270

  However, in the conventional apparatus, the size of the curtain-like light is constant even when the size of the projected image projected on the projection surface is changed to a small size. In such an apparatus, for example, when the size of the projected image is changed from 100 inches to 60 inches, the intensity of the curtain-shaped light is high even outside the projected image area. Therefore, in the conventional apparatus, curtain-like light outside the projection image area is reflected by some object, and the reflected light is erroneously detected as light reflected in the projection image area, which may cause noise. is there. Similar problems also occur when curtain-shaped light is irradiated substantially parallel to the display surface when an image is displayed on the display surface by various display devices instead of the projection unit.

  Therefore, the present invention has been made in view of the above-described problems of the prior art, and provides a position detection device and an adjustment method that can suppress noise to a smaller extent.

[1] The present invention provides an irradiation unit that emits light for detecting the position of an indicator along an image projected on a projection plane by image light projected by a projection unit, and information on the size of the image It is a position detection apparatus provided with the acquisition part which acquires, and the adjustment part which adjusts the output of the said irradiation part based on the information acquired by the said acquisition part.

  With this configuration, the position detection device acquires information about the size of the image, and adjusts the output of the irradiation unit based on the acquired information, so that noise can be further reduced.

[2] The present invention is the position detection device according to [1], wherein the adjustment unit adjusts an output of the irradiation unit by changing electric power supplied to the irradiation unit.

  With this configuration, since the position detection device adjusts the output of the irradiation unit by changing the power supplied to the irradiation unit, it is possible to reduce extra power costs.

[3] The present invention further includes a calculation unit that calculates a distance between the projection plane and the projection unit or a distance corresponding thereto, and the acquisition unit is information on the distance calculated by the calculation unit. Is a position detection device according to [1] or [2], which is acquired as information on the size of the image.

  With this configuration, the position detection device calculates the distance between the projection surface and the projection unit or a distance corresponding thereto, and acquires the calculated distance information as information related to the size of the image. There is no need to measure the size, and the user's workload for adjusting the output of the irradiation unit can be reduced.

[4] Further, the present invention includes an imaging unit that captures the image, and the calculation unit is configured to determine a distance between the image and the projection unit based on information on the image captured by the imaging unit. Or it is a position detection apparatus as described in [3] which calculates the distance according to it.

  With this configuration, the position detection device calculates the distance between the image and the projection unit or the distance according to the information based on the information of the image captured by the imaging unit, and thus does not require additional hardware. The output of the irradiation unit can be adjusted.

[5] The present invention further includes an input receiving unit that receives information regarding the size of an image input by a user, and the acquisition unit acquires information regarding the size of the image received by the input receiving unit. It is a position detection apparatus as described in any one of [1] to [4].

  With this configuration, the position detection device accepts information related to the size of the image input by the user and accepts information related to the size of the image input by the user, so that the output of the irradiation unit is adjusted to an output desired by the user. Can do.

[6] Further, the present invention includes any one of [1] to [5], further including a detection unit that detects the position of the indicator by the light reflected by the indicator from the light irradiated by the irradiation unit. The position detection device according to one item.

  With this configuration, the position detection device detects the position of the indicator by the light reflected by the indicator from the light irradiated by the irradiation unit, and thus can display a cursor or the like at the detected position.

[7] Further, the present invention irradiates light for detecting the position of the indicator along the image projected on the projection plane by the image light projected by the projection unit, and obtains information on the size of the image. This is an adjustment method for acquiring and adjusting the output of the irradiation unit based on information on the size of the image.

With this configuration, the adjustment method acquires information about the size of the image, and adjusts the output of the irradiation unit based on the acquired information. Therefore, noise can be further reduced.

[8] In addition, the present invention provides an irradiation unit that emits light for detecting the position of the indicator along an image displayed on the display surface, an acquisition unit that acquires information on the size of the image, An adjustment unit that adjusts an output of the irradiation unit based on information acquired by the acquisition unit.

  With this configuration, the position detection device irradiates the irradiation unit with light for detecting the position of the indicator along the image displayed on the display surface, acquires information on the size of the image, and acquires the acquired information. Since the output of the irradiation unit is adjusted based on the noise, the noise can be further reduced.

  As described above, the position detection device acquires information about the size of the image, and adjusts the output of the irradiation unit based on the acquired information. Therefore, noise can be further reduced.

It is a figure which shows typically an example of a mode that the position detection apparatus 1 which concerns on 1st Embodiment is used. It is the side view of the light curtain production | generation apparatus 3 and the screen SC seen from the direction of the arrow P shown in FIG. FIG. 2 is a diagram illustrating an example of functional configurations of a projector 2 and a light curtain generation device 3 included in the position detection device 1. It is a figure explaining an example of the output adjustment of the light-emitting body 49 by the output control part 45 using PWM. 6 is a flowchart illustrating an example of a flow of processing in which the position detection device 1 adjusts the output of the light emitter 49 according to the size of the projection image PIC1. It is a schematic diagram for demonstrating typically the projection image before and after output adjustment by the position detection apparatus 1, and the planar light LC. In addition to the position detection device 1 changing according to the distance between the projector 2 and the screen SC, the output of the light emitter 49 is changed according to the size of the projection image PIC1 changed by the zoom function. It is a flowchart which shows an example of a flow. It is a figure which shows the example of the projection image in which size was changed by the picture shift function.

<First Embodiment>
A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically illustrating an example of how the position detection device 1 according to the first embodiment is used. In the present embodiment, the position detection device 1 includes, for example, the projector 2 including the control unit 23, the light curtain generation device 3 including the light emitter 49, and the imaging unit 21.

  In FIG. 1, for convenience, the projector 2, the light curtain generating device 3, and the imaging unit 21 are shown as separate bodies. However, these components may be configured by integrated hardware. Hereinafter, the projector 2 will be described as including the imaging unit 21 inside. The projector 2 projects various image lights onto the screen SC. An image corresponding to the image light is projected on the screen SC as a projection image PIC1. As the screen SC, a plane such as a wall may be used instead of a dedicated screen for displaying a projected image.

  The light curtain generating device 3 irradiates the light emitter 49 with planar lights LC1 and LC2 along the projection surface (the screen SC in the example shown in FIG. 1) on which the projection image PIC1 is projected. Hereinafter, if it is not necessary to distinguish between the planar lights LC1 and LC2, they are simply referred to as planar lights LC. The wavelength band of the planar light LC is, for example, an infrared wavelength band (for example, light in the infrared region of about 940 nanometers), but is replaced with other wavelength bands such as visible light. May be. The light curtain generating device 3 is installed, for example, above the screen SC, and irradiates the planar light LC onto the two fan-shaped planar areas covering the screen SC shown in FIG. The position where the light curtain generating device 3 is installed may be below the screen SC or at the left or right end of the screen SC instead of above the screen SC.

  Here, with reference to FIG. 2, the installation position of the light curtain production | generation apparatus 3 is demonstrated. FIG. 2 is a diagram showing the installation position of the light curtain generating device 3 with respect to the screen SC and the direction of the projection light PL. FIG. 2 is a side view of the light curtain generating device 3 and the screen SC as seen from the direction of the arrow P shown in FIG. As shown in FIG. 2, the light emitter 49 of the light curtain generating device 3 irradiates the planar light LC substantially parallel to the screen SC. The light emitter 49 is, for example, an LED (Light Emitting Diode) or LD (Laser Diode) attached with an optical system member such as a polymeter lens or a Powell lens.

  The imaging unit 21 is, for example, a camera including a CCD (Charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor), or the like that is an imaging device that converts collected light into an electrical signal. In the present embodiment, the imaging unit 21 is hardware integrated with the projector 2 as shown in FIG. Instead of being integrated with the projector 2, the imaging unit 21 may be connected to the projector 2 so as to be communicable with the projector 2 by wire or wirelessly as a separate body from the projector 2.

  The imaging unit 21 captures a range including a projection image projected on the screen SC, and outputs the captured image to the control unit 23 included in the projector 2. For example, an infrared filter for selectively receiving light in the wavelength region irradiated by the light curtain generating device 3 is attached to the imaging unit 21. It is assumed that a mechanism that can be attached to and detached from the lens of the imaging unit 21 is attached to the infrared filter.

  Returning to the description of FIG. The control unit 23 controls the entire position detection device 1. As one of the functions, the control unit 23 detects a position (for example, a position on the projection image PIC1) pointed by the user with an indicator such as a finger or a stick based on the captured image captured by the imaging unit 21. To do. More specifically, the control unit 23 detects the reflected light imaged on the captured image, and the planar light LC reflected by the indicator, and the reflected light on the detected captured image. The position of the indicator (for example, on the projected image PIC1) is detected based on the position of. Then, the control unit 23 displays a mark such as a cursor at the position of the detected indicator in the projection image PIC1.

  Further, the control unit 23 acquires the size of the projection image PIC1, and controls the light curtain generating device 3 so that the light curtain generating device 3 changes the output of the light emitter 49 according to the acquired size. Thus, the size of the planar light LC is changed. For example, when the size of the projection image PIC1 is changed from 100 inches to 60 inches, the control unit 23 acquires information indicating that the size of the projection image PIC1 is 60 inches. Then, the control unit 23 controls the light curtain generating device 3 to lower the output of the light emitter 49 based on the acquired information, so that the size suitable for the projection image PIC1 whose size has been changed to 60 inches. The planar light LC is irradiated by the light emitter 49.

  Next, with reference to FIG. 3, the functional configuration of the projector 2 and the light curtain generating device 3 included in the position detection device 1 will be described. FIG. 3 is a diagram illustrating an example of functional configurations of the projector 2 and the light curtain generation device 3 included in the position detection device 1. The projector 2 includes, for example, an imaging unit 21, a control unit 23, a liquid crystal panel drive unit 35, a projection optical system 37, a storage unit 40, an image acquisition unit 41, and an input reception unit 43.

  The control unit 23 includes, for example, a position detection unit 25, an image processing unit 27, a distance calculation unit 29, a size information acquisition unit 30, and an output adjustment unit 33. In the present embodiment, some or all of these functional units included in the control unit 23 are configured using a field-programmable gate array (FPGA) (not shown). The central processing unit may read various programs stored in the storage unit 40 and execute the read programs. The control unit 23 acquires a captured image from the imaging unit 21. The position detection unit 25 detects the position of the indicator based on the captured image obtained by imaging the reflected light of the planar light LC by the indicator.

  The image processing unit 27 converts the image signal acquired from the image acquisition unit 41 into image information representing the gradation of each pixel of the liquid crystal panel 39 included in the projection optical system 37 for each of RGB (Red, Green, Blue). Convert. In addition, the image processing unit 27 superimposes the information on the mark on the image information so that a mark such as a cursor is displayed at the position of the indicator detected by the position detection unit 25. In addition, the image processing unit 27 changes the size of the projection image PIC1 by the zoom function in accordance with the instruction from the user received by the input receiving unit 43. When the size of the projection image PIC1 is changed by the zoom function, the image processing unit 27 receives information indicating the scaling factor applied to the projection image PIC1 in the scaling by the zoom function in response to a request from the size information acquisition unit 30. Output to the size information acquisition unit 30.

  The distance calculation unit 29 performs processing (distance calculation processing) for calculating the distance between the projector 2 (projection optical system 37) and the screen SC based on the captured image acquired from the imaging unit 21. Note that the distance calculated by the distance calculation process is not limited to the distance between the projection optical system 37 and the screen SC, and may be any distance between any reference position of the projector 2 and the screen SC. When the imaging unit 21 is configured integrally with the projector 2 as in the present embodiment, the distance between the imaging unit 21 and the screen SC may be used. In the present embodiment, the size information acquisition unit 30 includes a size determination unit 31 and a size information reading unit 32. The size information acquisition unit 30 acquires the size of the projection image PIC1 determined by the size determination unit 31 or the size information of the projection image PIC1 read by the size information reading unit 32. The size determination unit 31 determines the size of the projection image PIC1 based on the distance between the projector 2 and the screen SC calculated by the distance calculation unit 29. More specifically, the size determination unit 31 is information stored in the storage unit 40 and includes information in which the distance between the projector 2 and the screen SC is associated with the size of the projection image PIC1. 1 read as correspondence information. Then, the size determination unit 31 determines the size of the projection image PIC1 corresponding to the distance based on the read first correspondence information and the distance calculated by the distance calculation unit 29. The size determination unit 31 outputs information on the determined size to the size information acquisition unit 30.

  The size determination unit 31 uses, for example, a function representing the size of the projection image PIC1 with the distance as a variable, instead of determining the size of the projection image PIC1 by reading the first correspondence information from the storage unit 40. Thus, the size of the projected image PIC1 may be calculated. The size determination unit 31 acquires information indicating the enlargement / reduction ratio set by the zoom function for enlarging / reducing the projection image PIC1 from the image processing unit 27 of the projector 2, and information indicating the acquired enlargement / reduction ratio and a distance calculation unit The size of the projection image PIC1 may be determined based on the distance calculated by 29. In this case, the information stored by the storage unit 40 is associated with the distance between the projector 2 and the screen SC, information indicating the enlargement / reduction ratio, and the size of the projection image PIC1 instead of the first correspondence information. It is assumed that the second correspondence information.

  In the first embodiment, in order to simplify the description, it is assumed that the projection image PIC1 is not enlarged or reduced by the zoom function, and the size determination unit 31 is based on the distance between the projector 2 and the screen SC. Description will be made assuming that the size of the projection image PIC1 is determined. In the second embodiment, a case where the size determination unit 31 acquires information indicating the enlargement / reduction ratio and determines the size of the projection image PIC1 based on the acquired information indicating the enlargement / reduction ratio will be described. When the size information reading unit 32 acquires information indicating the size of the projection image received from the user by the input reception unit 43, the size information reading unit 32 outputs the acquired size of the projection image to the size information acquisition unit 30.

  The output adjustment unit 33 controls the light curtain generation device 3 to adjust the output of the light emitter 49 according to the size of the projection image PIC1 acquired by the size information acquisition unit 30. More specifically, the output adjustment unit 33 sends information indicating an output value to be output by the light emitter 49 to the light curtain generation device 3 based on the size of the projection image PIC1 acquired by the size information acquisition unit 30. Output. In the present embodiment, the output value to be output by the light emitter 49 is determined in advance for each size of the projection image PIC1, but instead, for example, a configuration that can be selected by the user may be used. .

  The image acquisition unit 41 acquires an external image signal via an image input terminal or the like, and outputs the acquired image signal to the control unit 23. The liquid crystal panel driving unit 35 generates a driving voltage according to image information (in this embodiment, information on a mark corresponding to the position of the indicator is superimposed) input from the image processing unit 27 of the control unit 23. It is applied (driven) to each pixel of the liquid crystal panel 39 provided in the projection optical system 37. By this application, the liquid crystal panel driving unit 35 causes the liquid crystal panel 39 to form light incident on the liquid crystal panel 39 from a light source (not shown) included in the projection optical system 37 as light that displays an image corresponding to the image information.

  The projection optical system 37 includes a liquid crystal panel 39. The projection optical system 37 includes a reflector that reflects the light emitted from the light source to the liquid crystal panel 39 side, and forms the reflected light on the liquid crystal panel 39 as light that displays an image according to image information. The projection optical system 37 projects the light that projects the image formed on the liquid crystal panel 39 onto the screen SC through a projection lens (not shown). The light source is, for example, a discharge-type light source lamp made of an ultrahigh pressure mercury lamp, a metal halide lamp, or the like, but is not limited to a light source lamp, and an LED (Light Emitting Diode) light source, a laser light source, or the like may be used. The liquid crystal panel 39 is, for example, a transmissive liquid crystal panel corresponding to each of RGB, which is the three primary colors of light, in which liquid crystal is sealed between a pair of transparent substrates. The liquid crystal panel 39 is not limited to a transmissive liquid crystal panel, and may be a reflective liquid crystal panel. Further, instead of the liquid crystal panel 39, a DMD (Digital Mirror Device) or the like may be used.

  The storage unit 40 includes, for example, a RAM (Random Access Memory), a register, an HDD (Hard Disk Drive), an SSD (Solid State Drive), or the like. The storage unit 40 stores various information, programs, and the like that are processed by the projector 2.

  The input receiving unit 43 is, for example, various operation buttons, operation keys, a touch panel, or the like that receives an instruction from the user. The input receiving unit 43 is not limited to the one provided in the projector 2 (built in), but includes various operation buttons, operation keys, a touch panel, and the like that receive input from the user, and represents information received from the user. It may be a remote controller or the like that transmits wirelessly or by wire. In this case, the projector 2 is assumed to include a receiving unit that receives information transmitted from the remote controller.

  The light curtain generation device 3 includes an output control unit 45 and a light curtain generation unit 47. When the output control unit 45 acquires information indicating the output value to be output from the light emitter 49 from the projector 2, the output control unit 45 adjusts the output of the planar light LC by the light emitter 49 based on the acquired information indicating the output value. . The output control unit 45 adjusts the output of the light emitter 49 by, for example, PWM (Pulse Width Modulation). Note that the output control unit 45 may adjust the output of the light emitter 49 by changing a current value supplied to the light emitter 49 instead of PWM. In this case, the current value is changed by gain control using an amplifier, for example. Here, with reference to FIG. 4, the output adjustment of the light emitter 49 by the output control unit 45 using PWM will be described.

  FIG. 4 is a diagram illustrating an example of output adjustment of the light emitter 49 by the output control unit 45 using PWM. FIG. 4A shows a timing chart in which the output control unit 45 supplies current to the light emitter 49 when the projection image PIC1 is 100 inches, for example. In this case, the output control unit 45 supplies current to the light emitter 49 as a pulse that repeats ON and OFF in a 9.27 microsecond width.

  On the other hand, FIG. 4B shows a timing chart in which the output control unit 45 supplies current to the light emitter 49 when the projection image PIC1 is 60 inches, for example. In this case, as shown in FIG. 4B, the time width per pulse in which current is supplied to the light emitter 49 is half that of the pulse shown in FIG. The output value at which the light emitter 49 emits the planar light LC is determined based on the value obtained by integrating the current sent with this pulse width with the supply time. Therefore, the output control unit 45 can adjust the output value at which the light emitter 49 emits the planar light LC by changing the pulse width of the current supplied to the light emitter 49.

  Hereinafter, the flow of processing in which the position detection device 1 adjusts the output of the light emitter 49 according to the size of the projection image PIC1 will be described with reference to FIG. FIG. 5 is a flowchart illustrating an example of a flow of processing in which the position detection device 1 adjusts the output of the light emitter 49 according to the size of the projection image PIC1. In the following description, it is assumed that the distance between the projector 2 and the screen SC is changed due to the movement of the projector 2, and the size of the projected image PIC1 is changed from 100 inches to 60 inches.

  First, the projector 2 switches the operation mode to the distance measurement mode by receiving an instruction according to the operation by the user by the input receiving unit 43 (step S100). Next, the projector 2 projects an image for distance measurement as a projection image (step S110). Next, the projector 2 captures the distance measurement image projected in step S110 by the imaging unit 21 (step S120). Then, the control unit 23 of the projector 2 acquires a captured image captured from the imaging unit 21. Here, as the image for distance measurement, an arbitrary image in which a pattern for distance measurement is drawn may be used. For example, an image containing one or more patterns in which three or more points are drawn is used. It is done. Next, the projector 2 performs a distance calculation process (step S130).

  Here, the distance calculation process will be described. For example, the projector 2 calculates the distance on the captured image between two points of each of the three points captured in the acquired captured image, and based on the calculated distance between the two points of each of the three points. The distance between 2 and the screen SC is calculated. In this case, calibration is performed for the proportional relationship between the distance between two points of each of the three points and the distance between the projector 2 and the screen SC, and the distance calculation unit 29 is based on the proportional relationship. Thus, the distance between the projector 2 and the screen SC is calculated.

  In the present embodiment, the projector 2 uses a function that represents a change in the distance between the projector 2 and the screen SC with respect to a change in the distance between three points on the captured image. The distance may be calculated. For calculating the distance between the projector 2 and the screen SC, for example, a triangulation method using stereo imaging using two imaging units or an ultrasonic transmission / reception unit is used instead of such a distance calculation process. It may be performed by a process using a distance measurement method using ultrasonic waves, a method of calculating a distance from the ratio of the size of the projected image PIC1 to the size of the screen SC displayed in the image, or the like.

  After calculating the distance between the projector 2 and the screen SC in step S130, the projector 2 reads the first correspondence information stored in the storage unit 40, the read first correspondence information, and the calculated projector 2 Based on the distance to the screen SC, the size of the projection image PIC1 is determined (step S140). In the following description, it is assumed that the projector 2 determines that the size of the projection image PIC1 is 60 inches.

  Next, in order to change the output of the light emitter 49 of the light curtain generating device 3 based on the determined size of the projection image PIC1, the projector 2 displays information indicating an output value to be output by the light emitter 49. Output to the light curtain generator 3. And the light curtain production | generation apparatus 3 changes the output value of the light-emitting body 49 based on the information which shows the output value which the light-emitting body 49 which should be output acquired from the projector 2 (step S150). Next, the light curtain generating device 3 irradiates the light emitter 49 with the planar light LC with the changed output value (step S160).

  Here, with reference to FIG. 6, the projected image and the planar light LC before and after the output adjustment by the position detection apparatus 1 will be schematically described. FIG. 6 is a schematic diagram for schematically explaining the projected image and the planar light LC before and after the output adjustment by the position detection device 1. FIG. 6A shows the projection image PIC2 and the planar light LC before the output adjustment by the position detection device 1. The example shown in FIG. 6A shows a situation where the output control unit 45 supplies current to the light emitter 49 by the pulse shown in FIG. In the following description, it is assumed that the size of the projected image PIC2 is 100 inches. As shown in FIG. 6A, the position detection device 1 emits planar light LC1 and LC2 corresponding to the size of the projection image PIC2 by the light emitter 49.

  On the other hand, FIG. 6B shows the projected image PIC3 and the planar light LC after the output adjustment by the position detection device 1. The example shown in FIG. 6B shows a situation where the output control unit 45 supplies current to the light emitter 49 by the pulse shown in FIG. 4B, for example. In the following description, it is assumed that the size of the projected image PIC3 is 60 inches. When the size of the projected image changes from 100 inches to 60 inches, the position detection device 1 determines the size of the projected image, and based on the determined size, the light emitter 49 according to the size of the projected image PIC3. Irradiation with planar light LC3 and LC4. As shown in FIG. 6B, since the position detection device 1 reduces the amount of current supplied to the light emitter 49 by PWM, the planar lights LC3 and LC4 are compared with the planar lights LC1 and LC2. And the irradiation range is narrow. Thus, the position detection apparatus 1 irradiates the planar light LC in a suitable range according to the size of the projection image.

  Note that in the projector 2, when step S100 is omitted and the operation mode of the projector 2 is not switched to the distance measurement mode, the input receiving unit 43 replaces the projection image PIC3 from the user instead of the processing in step S130 and step S140. Information indicating the size is accepted. Then, the size information reading unit 32 outputs the received size of the projection image PIC3 to the size information acquisition unit 30. As a result, the projector 2 performs the processes in step S150 and step S160.

  In the position detection device 1, the output of the light emitter 49 is output by either the acquisition processing of information indicating the size of the projection image by the size information reading unit 32 or the determination processing of the size of the projection image by the size determination unit 31. It is assumed that the user can select whether to adjust.

  In the present embodiment, the size of the projection image determined by the size determination unit 31 and the output of the light emitter 49 are calculated based on the distance between the projector 2 and the screen SC calculated by the distance calculation unit 29. However, information that associates the distance between the projector 2 and the screen SC and the size of the projected image may be stored in the storage unit 40. In this case, the size determination unit 31 may not be provided. The distance calculation unit 29 may be provided in the size information acquisition unit 30.

  As described above, the position detection apparatus 1 according to the first embodiment emits the planar light LC that covers the projection image according to the size of the projection image, and specifically, the projection image. The larger the size, the larger the irradiation area of the planar light LC, and the smaller the projection image size, the smaller the irradiation area of the planar light LC. Moreover, since the position detection apparatus 1 acquires the information regarding the size of a projection image, and adjusts the output of the light-emitting body 49 based on the acquired information, it can suppress noise more. Moreover, since the position detection apparatus 1 adjusts the output of the light emitter 49 by changing the power supplied to the light emitter 49, the extra power cost can be reduced.

  In addition, the position detection device 1 calculates the distance between the projector 2 and the screen SC or a distance corresponding thereto, and acquires the calculated distance information as information related to the size of the projection image. It is not necessary to measure the size of the light source 49, and the amount of work for the user regarding the output adjustment of the light emitter 49 can be reduced. Further, the position detection device 1 requires additional hardware in order to calculate the distance between the projector 2 and the screen SC or the distance according to the information based on the projection image captured by the imaging unit 21. Without adjustment, the output of the light emitter 49 can be adjusted.

  Further, since the position detection apparatus 1 receives information on the size of the projection image input by the user, the output of the light emitter 49 can be adjusted to an output desired by the user. In addition, since the position detection device 1 detects the position of the indicator by the light reflected by the indicator, the light emitted from the light emitter 49 can display a cursor or the like at the detected position.

<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. About the structure of the position detection apparatus 1 which concerns on 2nd Embodiment, FIG. 3 is used and the same code | symbol is attached | subjected and demonstrated to the same function part. The position detection device 1 acquires the size of the projection image PIC1 when the size of the projection image PIC1 is changed by the zoom function of the projector 2 in addition to changing the size of the projection image PIC1 by the distance between the projector 2 and the screen SC. Then, the output of the light emitter 49 is adjusted based on the acquired size and information indicating the enlargement / reduction ratio.

  Referring to FIG. 7, in addition to the position detecting device 1 changing according to the distance between the projector 2 and the screen SC, the light emitter 49 is further changed according to the size of the projected image PIC1 changed by the zoom function. The flow of processing for changing the output of will be described. FIG. 7 shows that the position detection device 1 changes the output of the light emitter 49 according to the size of the projection image PIC1 changed by the zoom function in addition to changing by the distance between the projector 2 and the screen SC. It is a flowchart which shows an example of the flow of the process to change. First, the projector 2 is moved in position by the user, and further changes the size of the projected image PIC1 by using the zoom function based on the input from the user (step S200). Hereinafter, the projector 2 will be described assuming that the size of the projected image is changed from 100 inches to 60 inches by the movement of the position of the projector 2 by the user and the zoom function. Hereinafter, a 100-inch projection image is referred to as a projection image PIC4, and a 60-inch projection image is referred to as a projection image PIC5.

  Next, the projector 2 acquires the size of the projection image PIC5 (step S210). More specifically, the size determination unit 31 of the projector 2 acquires information indicating the enlargement / reduction ratio set by the zoom function for enlarging / reducing the projection image PIC4 from the image processing unit 27, and information indicating the acquired enlargement / reduction ratio. Based on the distance calculated by the distance calculation unit 29 and the second correspondence information stored by the storage unit 40, the size of the projection image PIC5 is determined. It is assumed that the storage unit 40 stores in advance second correspondence information in which the distance between the projector 2 and the screen SC, the size of the projection image, and the enlargement / reduction ratio are associated with each other.

  In the following description, it is assumed that the projector 2 determines that the size of the projected image PIC5 is 60 inches. The size determination unit 31 outputs the determined size to the size information acquisition unit 30. Then, the size information acquisition unit 30 acquires the size of the projection image PIC5 from the size determination unit 31.

  Next, the projector 2 outputs an output to be output by the light emitter 49 in order to change the output of the light emitter 49 of the light curtain generation device 3 based on the size of the projection image PIC5 acquired by the size information acquisition unit 30. Information indicating the value is output to the light curtain generating device 3. And the light curtain production | generation apparatus 3 changes the output value of the light-emitting body 49 based on the information which shows the output value which the light-emitting body 49 which should be output acquired from the projector 2 (step S220). Next, the light curtain generating device 3 causes the light emitter 49 to emit light with the changed output value, and irradiates the planar light LC having a size suitable for the projection image PIC2 (step S230).

  As described above, the position detection device 1 changes the output of the light emitter 49 in accordance with the size of the projection image changed by the zoom function. However, instead of the zoom function, for example, the projection changed by the picture shift. The output of the light emitter 49 may be changed according to the size of the image. The picture shift function, for example, divides a frame of a projected image into nine divided areas, and displays the projected image displayed in the area selected by the user before the division in the divided areas. Is a function for changing the size to the size of the selected area. Note that the number of divided areas may be two or more and does not necessarily need to be nine. Further, the sizes of the divided areas are not all the same size, but may be different sizes in individual areas. Moreover, the divided | segmented area | region may mutually overlap and it does not need to overlap. In the following description, it is assumed that there are nine divided areas, each of which does not overlap with each other and has the same size (size).

  Here, a projected image whose size has been changed by the picture shift function will be described with reference to FIG. FIG. 8 is a diagram illustrating an example of a projected image whose size has been changed by the picture shift function. In FIG. 8A, a 100-inch projected image PIC4 is displayed as a projected image PIC6 with the size changed in the middle of the upper part of the area divided into nine on the screen SC by the picture shift function. It shows the state being done. In this case, since the projection image PIC6 is displayed directly below the light curtain generation device 3, the position detection device 1 does not move the position of its own device, and the projection image PIC6 according to the size of the projection image PIC6. The planar lights LC5 and LC6 can be irradiated so as to cover the entire surface of the PIC6.

  In FIG. 8B, the 100-inch projected image PIC4 is changed in size and displayed as the projected image PIC7 on the lower right side of the area divided into nine on the screen SC by the picture shift function. It shows the state. In this case, the position detection device 1 covers the entire surface of the projection image PIC7 in accordance with the size of the projection image PIC7 by moving the position of the light curtain generation device 3 directly above the projection image PIC7. Thus, planar light LC5 and LC6 can be irradiated. Note that the movement of the position of the light curtain generating device 3 may be performed by the user, or the position of the projected image PIC7 is detected based on information indicating a divided area on which the projected image is projected by the picture shift function. Further, it may be automatically moved by a moving mechanism attached to the own apparatus to the position immediately above the detected position.

  Note that the position detection device 1 is configured such that when the size of the projected image is changed by any one of the movement of the position of the projector 2 by the user, the zoom function, the picture shift function, or a combination of two or more thereof, You may adjust the output of the light-emitting body 49 with the combination of the process corresponding to the change of the size of the image by each.

  As described above, since the position detection device 1 according to the second embodiment changes the output of the light emitter 49 according to the size of the projection image changed by the zoom function, it is the same as in the first embodiment. The effect of can be obtained.

<Modification of the above embodiment>
In the above embodiment, the mode in which the user performs an instruction operation with the indicator on the screen SC (projection surface, display surface) on which the front projection type projector 2 projects (displays) an image has been described. However, the display device (display unit) other than the projector 2 may perform an instruction operation on a display screen (display surface) on which an image is displayed. Also in this case, the light curtain generating device 3 and the imaging unit 21 may be configured integrally with the display device, or may be configured separately from the display device. Display devices other than the projector 2 include a rear projection type projector, a liquid crystal display, an organic EL (Electro Luminescence) display, a plasma display, a CRT (cathode ray tube) display, and a SED (Surface-conduction Electron-emitter Display). Etc. can be used.

  It should be noted that a program for realizing the function of an arbitrary component in the apparatus described above (for example, position detection apparatus 1) is recorded on a computer-readable recording medium, and the program is read into a computer system and executed. You may make it do. Here, the “computer system” includes hardware such as an OS (Operating System) and peripheral devices. “Computer-readable recording medium” means a portable disk such as a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a CD (Compact Disk) -ROM, or a hard disk built in a computer system. Refers to the device. Further, the “computer-readable recording medium” means a volatile memory (RAM: Random Access) inside a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. Memory that holds a program for a certain period of time, such as Memory).

In addition, the above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the above program may be for realizing a part of the functions described above. Further, the program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

DESCRIPTION OF SYMBOLS 1 Position detection apparatus, 2 Projector, 3 Light curtain production | generation apparatus, 21 Imaging part, 23 Control part, 25 Position detection part, 27 Image processing part, 29 Distance calculation part, 30 Size information acquisition part, 31 Size determination part, 32 size Information reading unit, 33 output adjustment unit, 35 liquid crystal panel drive unit, 37 projection optical system, 39 liquid crystal panel, 40 storage unit, 41 image acquisition unit, 43 input reception unit, 45 output control unit, 47 light curtain generation unit, 49 Luminous body

Claims (8)

An irradiating unit that emits light for detecting the position of the indicator along the image projected on the projection plane by the image light projected by the projecting unit;
An acquisition unit for acquiring information on the size of the image;
Based on the information acquired by the acquisition unit, an adjustment unit that adjusts the output of the irradiation unit,
A position detection device comprising: The adjustment unit adjusts the output of the irradiation unit by changing the power supplied to the irradiation unit,
The position detection device according to claim 1. A calculation unit for calculating a distance between the projection surface and the projection unit or a distance corresponding thereto;
The acquisition unit acquires the information on the distance calculated by the calculation unit as information on the size of the image.
The position detection device according to claim 1 or 2. An imaging unit that captures the image;
The calculation unit calculates a distance between the image and the projection unit or a distance corresponding thereto based on information of the image captured by the imaging unit.
The position detection device according to claim 3. An input receiving unit for receiving information on the size of an image input by a user;
The acquisition unit acquires information on a size of an image received by the input reception unit;
The position detection device according to any one of claims 1 to 4. A detector for detecting the position of the indicator by the light reflected by the indicator;
The position detection device according to any one of claims 1 to 5. Irradiate the light for detecting the position of the indicator along the image projected on the projection surface by the image light projected by the projection unit, and
Obtaining information about the size of the image,
Adjusting the output of the irradiation unit based on information on the size of the image;
Adjustment method. An irradiation unit that emits light for detecting the position of the indicator along the image displayed on the display surface;
An acquisition unit for acquiring information on the size of the image;
Based on the information acquired by the acquisition unit, an adjustment unit that adjusts the output of the irradiation unit,
A position detection device comprising:

Images