JP2018132911A - Position detection device, and method for adjusting intensity of detection light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust output intensity of detection light in accordance with an indication body.SOLUTION: A position detection device includes: an irradiation part for irradiating detection light along an operation surface; an imaging part for acquiring a picked-up image obtained by imaging reflection light of the detection light reflected by an indication body for indicating the operation surface; a detection part for detecting a position indicated by the indication body on the basis of the picked-up image in the case that the output intensity of the detection light is first output intensity; and an adjustment part for adjusting the first output intensity on the basis of the picked-up image in the case that the output intensity is second output intensity being higher than the first output intensity.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to detection of the position of an indicator on an operation surface.

  Patent Document 1 discloses an interactive projector that specifies the position of an indicator. The position of the indicator that does not emit light (hereinafter referred to as a non-light emitting indicator) is specified by irradiating a planar detection light along the projection surface and detecting the detection light reflected by the indicator. . As the non-light emitting indicator, a user's finger is mainly assumed.

Japanese Patent Laying-Open No. 2015-158891

  User fingers vary greatly in color and width. For this reason, the output intensity of the detection light is set to be high in order to be able to specify even the finger of the type that is difficult to specify the position of the indicator.

  However, if the output intensity of the detection light is set high, in the case of a finger of a type that can easily specify the position of the indicator, the intensity of the reflected light becomes too high and the detection accuracy may decrease. This phenomenon is common even when a finger other than a finger is used as the non-light emitting indicator. Based on the above, it is an object of the present disclosure to adjust the output intensity of the detection light according to the indicator.

  An embodiment of the present disclosure includes an irradiation unit that irradiates detection light along an operation surface; an imaging unit that acquires a captured image obtained by imaging reflected light of the detection light reflected by an indicator that indicates the operation surface; A detection unit that detects a position indicated by the indicator based on the captured image when an output intensity of the detection light is a first output intensity; a second output intensity whose output intensity is higher than the first output intensity; An adjustment unit that adjusts the first output intensity based on the captured image in the above case. According to this form, adjustment of the output intensity according to the indicator can be realized.

  In the above aspect, the imaging unit may capture the captured image when the output intensity is the second output intensity when the indicator indicates a predetermined position. According to this embodiment, it is possible to prevent the adjustment result from changing due to the position of the indicator being different.

  The said form WHEREIN: You may further provide the projection part which projects an image on the said operation surface. According to this aspect, an image corresponding to the designated position can be projected on the operation surface.

  In the above aspect, the projection unit may project an image for designating the predetermined position when the detection light with the second output intensity is irradiated. According to this form, it is easy for the user to place the indicator at a predetermined position.

  In the above aspect, the predetermined position may be located farther from the imaging unit than the center of the imaging range of the imaging unit. According to this aspect, since the predetermined position is located on the side closer to the imaging unit than the center, the detection accuracy is reduced when the indicator is located on the side farther from the imaging unit than the center. Can be prevented.

  In the above aspect, the captured image is represented by a luminance value for each of a plurality of pixels; the adjustment unit is based on at least one of the number of pixels corresponding to the reflected light and the luminance value in the captured image. The first output intensity may be adjusted. According to this embodiment, adjustment can be easily realized.

  In the above aspect, the detection light is laser light; and the adjustment unit may adjust an output value of the laser light. According to this embodiment, adjustment can be easily realized.

  In the above embodiment, the detection light is a rectangular wave; the adjustment unit may adjust a duty ratio of the detection light. According to this embodiment, adjustment can be easily realized.

  In the above embodiment, the detection light may be infrared light. According to this aspect, the indicated position can be detected without being affected by visible light.

  The present disclosure can be realized in various forms other than the above. For example, the present invention can be realized in the form of a method for adjusting the intensity of detection light, a program for realizing the method, a non-temporary storage medium storing the program, and the like.

The perspective view of a position detection system. The front view of a position detection system. The side view of a position detection system. The block diagram which shows the internal structure of a projector. The flowchart which shows a detection light adjustment process. The figure which shows a mode that the image which designates the position of a nonluminous indicator is projected. The figure which shows a mode that layered detection light is output with a certain duty ratio.

Embodiment 1:
FIG. 1 is a perspective view of a position detection system 900. The position detection system 900 includes a projector 100, a screen plate 920, a layered detection light irradiating unit 440 (light curtain unit), and a self-luminous indicator 70. The projector 100 is an interactive projector and functions as a position detection device that executes a position detection method. The layered detection light irradiating unit 440 is a part of the projector 100, but is depicted as a separate body in FIG. 1 for convenience of illustration.

  The front surface of the screen plate 920 is used as a projection screen surface (SS). The projector 100 is fixed to the front and above the screen plate 920 by a support member 910. In FIG. 1, the projection screen surface SS is arranged so as to be orthogonal to the horizontal plane. However, the position detection system 900 can be used with the projection screen surface SS arranged horizontally.

  The projector 100 projects a projection screen PS (Projected Screen) on the projection screen surface SS. The projection screen PS usually includes an image drawn in the projector 100. When there is no image drawn in the projector 100, light is emitted from the projector 100 to the projection screen PS, and a white image is displayed. In this specification, “projection screen surface SS” means the surface of a member on which an image is projected. The “projection screen PS” means an area of an image projected on the screen surface SS by the projector 100. Usually, the projection screen PS is projected on a part of the projection screen surface SS. The projection screen surface SS is also referred to as an “operation surface SS” because it is used as an operation surface for instructing a position by an indicator.

  The self-light emitting indicator 70 is a pen-type indicator having a tip portion 71 capable of emitting light, a shaft portion 72 held by a user, and a button switch 73 provided on the shaft portion 72. The front end portion 71 of the self-luminous indicator 70 emits infrared rays, for example. The configuration and function of the self-luminous indicator 70 will be described later. In the position detection system 900, one or a plurality of non-luminous indicators 80 (non-luminous pens, fingers, etc.) can be used together with one or a plurality of self-luminous indicators 70.

  FIG. 2 is a front view of the position detection system 900, and FIG. 3 is a side view thereof. In this specification, the direction along the left and right of the operation surface SS is defined as the X direction, the direction along the top and bottom of the operation surface SS is defined as the Y direction, and the direction along the normal line of the operation surface SS is defined as the Z direction. It is defined as In addition, the upper left position of the operation surface SS in FIG. 2 is the origin (0, 0) of the coordinates (X, Y). For convenience, the X direction is also referred to as “left-right direction”, the Y direction is also referred to as “up-down direction”, and the Z direction is also referred to as “front-rear direction”. Further, in the Y direction (up and down direction), a direction in which the projection screen PS exists when viewed from the projector 100 is referred to as a “down direction”. In FIG. 3, the range of the projection screen PS in the screen plate 920 is hatched for convenience of illustration.

  The projector 100 detects layers in the projection lens 210 that projects the projection screen PS onto the operation surface SS, the camera 310 that captures an area of the projection screen PS, and indicators (the self-luminous indicator 70 and the non-luminous indicator 80). And a layered detection light irradiation unit 440 for irradiating the light LL (FIG. 3). The layered detection light irradiating unit 440 is layered (or curtained) over the entire surface of the projection screen PS in order to detect that the non-light emitting indicator 80 is in contact with the projection screen PS (that is, the operation surface SS). It is a laser that emits the detection light LL. For example, an infrared region can be used as the wavelength region of the layered detection light LL. That is, the layered detection light LL is infrared light and laser light. Here, “layer” or “curtain” means a thin space shape having a substantially uniform thickness. The distance between the operation surface SS and the layered detection light LL is set to a value in the range of 1 to 10 mm (preferably 1 to 5 mm), for example.

  The camera 310 has at least a first imaging function for receiving and imaging light in a wavelength region including the layered detection light LL (infrared laser) and the infrared wavelength emitted by the self-luminous indicator 70. The camera 310 further has a second imaging function for receiving and imaging light including visible light, and is preferably configured to be able to switch between these two imaging functions. For example, the camera 310 can arrange a near-infrared filter that blocks visible light and allows only near-infrared light to pass in front of the lens, or can move back from the front of the lens. (Not shown) are preferably provided. As shown in FIG. 3, the camera 310 is installed at a position separated from the operation surface SS by a distance L in the Z direction.

  The example of FIG. 2 shows a state in which the position detection system 900 is operating in the whiteboard mode. The whiteboard mode is a mode in which the user can arbitrarily draw on the projection screen PS using the self-light emitting indicator 70 and the non-light emitting indicator 80. A projection screen PS including a tool box TB is projected on the operation surface SS. This tool box TB selects a cancel button UDB for returning processing, a pointer button PTB for selecting a mouse pointer, a pen button PEB for selecting a pen tool for drawing, and an eraser tool for erasing a drawn image. It includes an eraser button ERB and a forward / backward button FRB that advances or moves the screen forward. The user can perform a process corresponding to the button or select a tool by clicking these buttons using an indicator. Note that the mouse pointer may be selected as a default tool immediately after the position detection system 900 is activated. In the example of FIG. 2, after the user selects a pen tool, the tip 71 of the self-luminous indicator 70 is moved in the projection screen PS so that a line is drawn in the projection screen PS. Yes. This movement is performed with the tip 71 of the self-luminous indicator 70 in contact with the operation surface SS. The line drawing is performed by a projection image generation unit (described later) inside the projector 100.

  Note that the position detection system 900 can also operate in modes other than the whiteboard mode. For example, the position detection system 900 can also operate in a PC interactive mode in which an image of data transferred from a personal computer (not shown) via a communication line is displayed on the projection screen PS. In the PC interactive mode, for example, an image of data such as spreadsheet software is displayed, and various tools and icons displayed in the image can be used to input, create, modify, etc. Become.

  FIG. 4 is a block diagram showing the internal configuration of the projector 100 and the self-luminous indicator 70. The projector 100 includes a control unit 700, a projection unit 200, a projection image generation unit 500, a position detection unit 600, an imaging unit 300, a signal light transmission unit 430, and a layered detection light irradiation unit 440. Yes.

  The control unit 700 controls each unit in the projector 100. The control unit 700 determines the content of the instruction made on the projection screen PS according to the indication position of the indicator (self-luminous indicator 70 or non-luminous indicator 80) detected by the position detector 600. Then, the projection image generation unit 500 is instructed to create or change the projection image according to the content of the instruction.

  The projection image generation unit 500 includes a projection image memory 510 that stores the projection image, and has a function of generating a projection image projected on the operation surface SS by the projection unit 200. The projected image generation unit 500 preferably further has a function as a keystone correction unit that corrects the trapezoidal distortion of the projection screen PS (FIG. 2).

  The projection unit 200 has a function of projecting the projection image generated by the projection image generation unit 500 onto the operation surface SS. The projection unit 200 includes a light modulation unit 220 and a light source 230 in addition to the projection lens 210 described with reference to FIG. The light modulator 220 modulates the light from the light source 230 according to the projection image data given from the projection image memory 510 to form the projection image light IML. The projection image light IML is typically color image light including visible light of three colors of RGB, and is projected on the operation surface SS by the projection lens 210. In addition, as the light source 230, various light sources, such as a light emitting diode, other than light source lamps, such as an ultrahigh pressure mercury lamp, are employable. The light emitting diode may be a laser diode. Further, as the light modulation unit 220, a transmissive or reflective liquid crystal panel, a digital mirror device, or the like can be adopted, and a configuration including a plurality of light modulation units 220 for each color light may be employed.

  The signal light transmitter 430 has a function of transmitting the device signal light ASL received by the self-light emitting indicator 70. The apparatus signal light ASL is a near-infrared signal for synchronization, and is periodically emitted from the signal light transmission unit 430 of the projector 100 to the self-luminous indicator 70. The tip light emitting unit 77 of the self-light emitting indicator 70 emits indicator signal light PSL (described later) that is a near infrared ray having a predetermined light emission pattern (light emission sequence) in synchronization with the device signal light ASL. In addition, the camera 310 of the imaging unit 300 executes imaging at a predetermined timing synchronized with the apparatus signal light ASL when detecting the positions of the indicators (the self-emission indicator 70 and the non-emission indicator 80).

  The imaging unit 300 includes the camera 310 described with reference to FIGS. As described above, the camera 310 has a function of receiving and imaging light in a wavelength region including the layered detection light LL and the infrared wavelength emitted by the self-luminous indicator 70. In the example of FIG. 4, the layered detection light LL irradiated by the layered detection light irradiating unit 440 is reflected by the indicators (the self-emission indicator 70 and the non-emission indicator 80), and the reflected detection light RDL is received by the camera 310. The state of being captured is depicted.

  The camera 310 further receives and picks up an indicator signal light PSL which is a near infrared ray emitted from the tip light emitting unit 77 of the self-luminous indicator 70. Imaging by the camera 310 includes a first period in which the layered detection light LL emitted from the layered detection light irradiation unit 440 is in an on state (light emission state) and a second period in which the layered detection light LL is in an off state (non-light emission state). It is executed both in the period. The position detection unit 600 determines whether each indicator included in the image is the self-emission indicator 70 or the non-emission indicator 80 by comparing the images in these two types of periods. It is possible.

  The position detection unit 600 has a function of analyzing an image captured by the camera 310 and determining an indication position of an indicator (the self-emission indicator 70 or the non-emission indicator 80). At this time, the position detection unit 600 determines whether each indicator in the image is the self-emission indicator 70 or the non-emission indicator 80 using the light emission pattern of the self-emission indicator 70. . In the present embodiment, the position detection unit 600 includes a detection unit 610, a correction unit 620, and a correction data memory 630. The detection unit 610 has a function of analyzing a captured image captured by the camera 310 and detecting an instruction position of the indicator. The correction unit 620 has a function of correcting the indicated position detected by the detection unit 610. The correction data memory 630 is a non-volatile memory that stores correction data used for correction by the correction unit 620.

  In addition to the button switch 73, the self light emitting indicator 70 is provided with a signal light receiving unit 74, a control unit 75, a tip switch 76, and a tip light emitting unit 77. The signal light receiver 74 has a function of receiving the device signal light ASL emitted from the signal light transmitter 430 of the projector 100. The tip switch 76 is a switch that is turned on when the tip 71 of the self-luminous indicator 70 is pressed, and is turned off when the tip 71 is not pressed. The tip switch 76 is normally in an off state, and when the tip portion 71 of the self-luminous indicator 70 comes into contact with the operation surface SS, the tip switch 76 is turned on by the contact pressure. When the tip switch 76 is in the OFF state, the control unit 75 has the first light emission pattern by causing the tip light emitting unit 77 to emit light with a specific first light emission pattern indicating that the tip switch 76 is in the OFF state. The indicator signal light PSL is emitted. On the other hand, when the tip switch 76 is turned on, the control unit 75 causes the tip light emitting unit 77 to emit light with a specific second light emission pattern indicating that the tip switch 76 is turned on. The indicator signal light PSL having Since the first light emission pattern and the second light emission pattern are different from each other, the position detection unit 600 identifies whether the tip switch 76 is in the on state or the off state by analyzing the image captured by the camera 310. Is possible.

  The button switch 73 of the self-luminous indicator 70 has the same function as the tip switch 76. Accordingly, the control unit 75 causes the tip light emitting unit 77 to emit light with the second light emission pattern when the button switch 73 is pressed by the user, and uses the first light emission pattern when the button switch 73 is not pressed. The tip light emitting unit 77 emits light. In other words, the control unit 75 causes the tip light emitting unit 77 to emit light with the second light emission pattern when at least one of the tip switch 76 and the button switch 73 is on, and both the tip switch 76 and the button switch 73 are off. In this state, the tip light emitting portion 77 is caused to emit light with the first light emission pattern.

  However, a function different from the tip switch 76 may be assigned to the button switch 73. For example, when the same function as that of the right click button of the mouse is assigned to the button switch 73, when the user presses the button switch 73, a right click instruction is transmitted to the control unit 700 of the projector 100, and the instruction is received. A corresponding process is executed. As described above, when a function different from that of the tip switch 76 is assigned to the button switch 73, the tip light emitting unit 77 depends on the on / off state of the tip switch 76 and the on / off state of the button switch 73. Light is emitted with four different light emission patterns. In this case, the self-luminous indicator 70 can transmit to the projector 100 while distinguishing the four combinations of the on / off states of the tip switch 76 and the button switch 73.

The specific examples of the five types of signal light depicted in FIG. 4 are summarized as follows.
(1) Projected image light IML: Image light (visible light) projected on the operation surface SS by the projection lens 210 in order to project the projection screen PS on the operation surface SS.
(2) Layered detection light LL: Laser light as curtain-like near infrared rays irradiated over the entire surface of the projection screen PS in order to detect the indicated position of the non-light emitting indicator 80.
(3) Reflected detection light RDL: Of the near-infrared rays irradiated as the layered detection light LL, the near-infrared rays reflected by the indicators (self-luminous indicator 70 and non-luminous indicator 80) and received by the camera 310 .
(4) Device signal light ASL: Near-infrared light periodically emitted from the signal light transmission unit 430 of the projector 100 in order to synchronize the projector 100 and the self-luminous indicator 70.
(5) Indicator signal light PSL: Near-infrared light emitted from the tip light emitting part 77 of the self-emission indicator 70 at a timing synchronized with the device signal light ASL. The light emission pattern of the indicator signal light PSL is changed according to the on / off state of the switches 73 and 76 of the self-light emission indicator 70. Further, it has a unique light emission pattern for identifying the plurality of self-light emitting indicators 70.

  FIG. 5 is a flowchart showing the detection light adjustment process. The detection light adjustment process is executed by the control unit 700. The control unit 700 stores a program for realizing the detection light adjustment process. The detection light adjustment process is a process for adjusting the output intensity of the layered detection light LL. The control unit 700 executes the detection light adjustment process when an instruction to automatically adjust the output intensity is input instead of the input specifying the output intensity by the user.

  First, an image designating the position of the non-light emitting indicator 80 is projected (S810). FIG. 6 shows a state in which an image designating the position of the non-light emitting indicator 80 is projected. In the present embodiment, a circle H is projected as this image. As shown in FIG. 6, the circle H is positioned at a corner of a range that can be projected as the projection screen PS. The corner here is the lower right corner when viewed from the user as shown in FIG. For this reason, the circle H is located farther from the center of the range in which the distance from the camera 310 can be projected as the projection screen PS. The position designated by the circle H is a predetermined position because it is predetermined with respect to the range of the projection screen PS.

  Subsequently, the layered detection light LL is output at the maximum output intensity (S820). The adjustment of the output intensity in the present embodiment is realized by adjusting the duty ratio.

  FIG. 7 shows a state in which the layered detection light LL is output at a certain duty ratio. The layered detection light LL in the present embodiment is a rectangular wave. The duty ratio R is calculated by R = Ton / T. T is the period of the rectangular wave. Ton is the length of time during which the layered detection light LL is output within one period. The period T is a fixed value in the present embodiment. The output time Ton can be changed.

  In the present embodiment, the maximum value of the output time Ton is the same time as the period T. For this reason, the maximum duty ratio Rmax, which is the maximum value of the duty ratio, is 100%. That is, in S820, the duty ratio R is set to 100% and the layered detection light LL is output.

  In the present embodiment, the output value of the layered detection light LL is fixed to the output value S. The output value of the layered detection light LL is the magnitude of the output during the time when the layered detection light LL is output.

  Next, the brightness value and the number of pixels of the non-light emitting indicator 80 are acquired (S830). When the user sees the circle H, the user is instructed in advance to place the non-light emitting indicator 80 in the circle H. If the user follows this instruction, the layered detection light LL is reflected in the vicinity of the circle H after a certain amount of time has elapsed since the start of S820. This reflected light is regarded as reflection by the non-light emitting indicator 80.

  In S830, pixels having a luminance value greater than the threshold value are extracted from the infrared rays reflected near the circle H, and the luminance value of each extracted pixel and the number of extracted pixels are acquired. In the present embodiment, the threshold value is zero.

  The reason why the circle H is arranged at the corner is that the adjustment is executed under the condition that the luminance value of the infrared ray reflected by the non-light emitting indicator 80 and incident on the camera 310 is as low as possible. For this reason, the position of the circle H may be the lower left corner.

  Next, the value of the upper N-th luminance value Bn is examined from the extracted luminance values of each pixel (S840). Specifically, the luminance values are arranged in descending order, the highest luminance value is set as the first, and the number of luminance values Bn corresponding to the Nth is checked.

Finally, the duty ratio R is determined using the luminance value Bn (S850). Specifically, the duty ratio R is determined by the following equation.
R = (Be / Bn) × Rmax (1)
Be included in Expression (1) represents an expected luminance value. The expected luminance value Be is determined in advance as the lowest value of the luminance value determined to be the non-light emitting indicator 80. The expected luminance value Be in the present embodiment is set to the smallest value among the values larger than the threshold value (zero) so as to satisfy the same condition as the extraction in S830. In the present embodiment, since the luminance value is represented by an integer, the expected luminance value Be is 1.

  Equation (1) assumes that the duty ratio R is determined so that the number of pixels determined to be the non-light emitting indicator 80 is N on the assumption that the luminance value is proportional to the duty ratio R. Intended. That is, if the layered detection light LL is output with the duty ratio R determined by the expression (1), the pixels having N + 1 and subsequent luminance values have luminance values smaller than the expected luminance value Be. It is no longer detected as a pixel indicating the body 80.

  N is determined in advance to be an appropriate number as the number of pixels determined to be the non-light emitting indicator 80. Further, the expected luminance values Be and N, and the output value S are determined so that Be <Bn in an assumed actual use environment. That is, the output intensity of the layered detection light LL output in S820 is higher than the output intensity after adjustment.

  According to the present embodiment described above, at least the following effects can be obtained.

  (1) Even when various non-light emitting indicators 80 are used, the output intensity of the layered detection light LL can be appropriately set according to the non-light emitting indicator 80.

  (2) In the detection light adjustment process, the non-light emitting indicator 80 is arranged at the corner, and the adjustment is executed on the condition that the intensity of the reflected light is the lowest as the position of the non-light emitting indicator 80. The detection does not fail because the camera 310 and the non-light emitting indicator 80 are separated from each other.

  (3) Since the circle H is displayed in the detection light adjustment process, the user can easily place the non-light emitting indicator 80 at a predetermined position.

  (4) Since the position where the circle H is displayed is fixed, it is not necessary to consider the difference in the position of the non-light emitting indicator 80 in adjusting the output intensity.

  The present disclosure is not limited to the embodiments, examples, and modifications of the present specification, and can be realized with various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in the embodiments described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the effects described above, replacement or combination can be performed as appropriate. If the technical feature is not described as essential in this specification, it can be deleted as appropriate. For example, the following are exemplified.

  In the detection light adjustment process, the position of the image (circle H in the embodiment) for designating the position of the non-light emitting indicator 80 may be anywhere within the projection screen PS. However, the distance from the camera 310 is preferably a position farther from the center of the range that can be projected as the projection screen PS.

  In the detection light adjustment process, an image for designating the position of the non-light emitting indicator 80 may not be displayed. In this case, the user may be separately instructed where to place them. Alternatively, the adjustment may be performed by the non-light emitting indicator 80 at an arbitrary position. When performing adjustment at an arbitrary position, an approximate position may be detected using reflected light, and the detected position may be added to the adjustment.

  The adjustment of the output intensity may be realized by changing parameters other than the duty ratio. For example, in addition to the duty ratio, the output value of the layered detection light LL may be changed, or the duty ratio may be fixed and the output value of the layered detection light LL may be changed.

  The coefficient (Be / Bn in the embodiment) for adjusting the output intensity may be changed. For example, it may be determined based on at least one of the luminance value and the number of pixels acquired in S830. That is, it may be determined by the luminance value without considering the number of pixels, or may be determined by the number of pixels without considering the luminance value. Alternatively, the total value of the luminance values acquired in S830 may be calculated, and the coefficient may be determined so that this total value becomes an expected value.

  The position detection device that executes the position detection method may not be an interactive projector. For example, another device that indicates a position on the operation surface using a self-luminous indicator may be used. The other device may be a digitizer or a tablet.

  In the above embodiment, some or all of the functions and processes realized by software may be realized by hardware. In addition, some or all of the functions and processes realized by hardware may be realized by software. As the hardware, for example, various circuits such as an integrated circuit, a discrete circuit, or a circuit module obtained by combining these circuits may be used.

  DESCRIPTION OF SYMBOLS 70 ... Self-light-emitting indicator, 71 ... Tip part, 72 ... Shaft part, 73 ... Button switch, 74 ... Signal light receiving part, 75 ... Control part, 76 ... Tip switch, 77 ... Tip light-emitting part, 80 ... Non-light-emitting instruction Body 100 Projector 200 Projection lens 210 Light modulator 230 Light source 231 Light source 300 Imaging unit 310 Camera 430 Signal light transmitter 440 Layer detection Light irradiating unit, 500 ... projected image generating unit, 510 ... projected image memory, 600 ... position detecting unit, 610 ... detecting unit, 620 ... correcting unit, 630 ... correction data memory, 700 ... control unit, 900 ... position detecting system, 910 ... Support member, 920 ... Screen plate, ASL ... Device signal light, D ... Tip offset, IML ... Projection image light, L ... Distance, LL ... Layered detection light, PS ... Projection screen, PS ... indicator signal light, RDL ... reflected detection light, SS ... operating surface (projection screen surface)

Claims (10)

An irradiating unit for irradiating detection light along the operation surface;
An imaging unit that acquires a captured image obtained by imaging the reflected light of the detection light reflected by the indicator that indicates the operation surface;
A detection unit that detects a position indicated by the indicator based on the captured image when the output intensity of the detection light is a first output intensity;
An adjustment unit that adjusts the first output intensity based on the captured image when the output intensity is a second output intensity that is higher than the first output intensity;
A position detection device comprising: The position detection device according to claim 1, wherein the imaging unit captures the captured image when the output intensity is the second output intensity when the indicator indicates a predetermined position. The position detection device according to claim 2, further comprising a projection unit that projects an image on the operation surface. The position detection device according to claim 3, wherein the projection unit projects an image for designating the predetermined position when the detection light with the second output intensity is irradiated. The position detection device according to any one of claims 2 to 4, wherein the predetermined position is located farther from the imaging unit than a center of an imaging range of the imaging unit. The captured image is represented by a luminance value for each of a plurality of pixels,
The adjustment unit adjusts the first output intensity based on at least one of the number of pixels corresponding to the reflected light and the luminance value in the captured image. The position detection apparatus described in 1. The detection light is laser light,
The position detection device according to any one of claims 1 to 6, wherein the adjustment unit adjusts an output value of the laser beam. The detection light is a rectangular wave,
The position detection device according to any one of claims 1 to 7, wherein the adjustment unit adjusts a duty ratio of the detection light. The position detection device according to any one of claims 1 to 8, wherein the detection light is infrared rays. An irradiating unit for irradiating detection light along the operation surface;
An imaging unit that acquires a captured image obtained by imaging the reflected light of the detection light reflected by the indicator that indicates the operation surface;
A detection unit that detects a position indicated by the indicator based on the captured image when the output intensity of the detection light is a first output intensity;
A device comprising: a method for adjusting the first output intensity,
A method of adjusting the first output intensity based on the captured image when the output intensity is a second output intensity higher than the first output intensity.

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