JP6403002B2 - Projector system and projector system control method - Google Patents

Description

The present invention relates to a projector system and a projector system control method.

As an invention for detecting the position of an indicator that indicates a projected image, for example, there is a projector disclosed in Patent Document 1. In this projector, an imaging unit captures a range including an image projected on a projection surface. When the light emitting pen as the indicator is on the projection surface, infrared light emitted from the light emitting pen is captured by the imaging unit. The projector detects the position of the light emitting pen on the projection plane by analyzing an image obtained by imaging. If an image of a line connecting the positions of the moved light-emitting pens is projected, an image of a line corresponding to the movement locus of the light-emitting pen can be projected.

JP 2014-74825 A

The projector can adjust the area of the projected image by adjusting the distance to the projection surface. Increasing the distance from the projector to the projection plane increases the area of the projected image, and decreasing the distance from the projector to the projection plane decreases the area of the projected image. When the distance from the projector to the projection surface is shortened, the distance from the light emitting pen that indicates the projection surface is also shortened, and when the distance from the light emitting pen to the projector is shortened, the light flux incident per unit area is increased in the imaging unit. Projector
The area of the light emitted by the light-emitting pen is detected from the image obtained by the imaging unit, and the position of the light-emitting pen is detected, but when the amount of light incident on the imaging unit increases, the area of the emitted light is widely detected. End up. Thus, if the area | region of the light-emitted light is detected widely, the precision at the time of detecting the position of a light-emitting pen will worsen.

An object of the present invention is to accurately detect the position of an indicator even when the projection distance of a projector is changed.

The present invention includes a light emitting unit, an acquisition unit that acquires a parameter for controlling the light emission amount of the light emitting unit,
An indicator having a control unit that controls the light emission amount of the light emitting unit based on the parameter acquired by the acquisition unit, a projection unit that projects an image, and the image is projected and instructed by the indicator A projector system comprising: an imaging unit that generates an image of a projection plane; and a projector that includes a position detection unit that detects the position of the indicator based on the image generated by the imaging unit.
According to this projector system, the position of the indicator can be detected with high accuracy even if the projection distance of the projector is changed.

In the present invention, the parameter may be a light emission time of the light emitting unit.
According to this configuration, when the projection distance of the projector is changed, the time for which the indicator emits light is adjusted, and the position of the indicator can be detected with high accuracy.

In the present invention, the parameter may be a radiation intensity of the light emitting unit.
According to this configuration, when the projection distance of the projector is changed, the intensity of light emitted from the indicator is adjusted, and the position of the indicator can be detected with high accuracy.

In the present invention, the projector includes a communication unit that transmits the parameter,
The acquisition unit may be configured to acquire the parameter transmitted by the communication unit.
According to this configuration, when the projection distance of the projector is changed, the intensity of light emitted from the indicator is adjusted by the parameter transmitted from the projector, and the position of the indicator can be detected with high accuracy.

In the present invention, the projector includes a distance acquisition unit that acquires a distance to the indicator or the projection surface, and the communication unit transmits a parameter corresponding to the distance acquired by the distance acquisition unit. It is good also as a structure.
According to this configuration, when the projection distance of the projector is changed, the parameter is set according to the projection distance, and the position of the indicator can be detected with high accuracy.

In the present invention, the communication unit, the longer the distance to the indicator or the projection surface,
A parameter for increasing the light emission amount of the light emitting unit may be transmitted.
According to this configuration, even when the projection distance of the projector is increased, the light emission amount of the light emitting unit is increased, and the position of the indicator can be detected with high accuracy.

In addition, the present invention is a light emitting device that illuminates an indicator that indicates a projection plane of a projector, the light emitting unit, an acquisition unit that acquires a parameter that controls a light emission amount of the light emitting unit, and the acquisition unit And a control unit that controls a light emission amount of the light emitting unit based on a parameter.
According to this light emitting device, the position of the indicator can be detected with high accuracy even if the projection distance of the projector is changed.

In addition, the present invention provides an acquisition step in which an indicator that indicates a projection surface on which a projector projects an image acquires a parameter for controlling the light emission amount of the light emitting unit, and the indicator acquires the parameter acquired in the acquisition step. A control step for controlling a light emission amount of the light emitting unit based on the projection step, the projector for projecting an image, an imaging step for the projector to generate an image of the projection surface, and the projector for the imaging step. And a position detection step of detecting the position of the indicator based on the image generated in step (b).
According to this method, the position of the indicator can be accurately detected even when the projection distance of the projector is changed.

1 is a diagram showing an apparatus that constitutes a display system 1. FIG. The figure which showed the hardware constitutions of the projector 10 and the indicator 20. The functional block diagram which showed the structure of the function implement | achieved in embodiment. The figure which showed an example of the time chart which detects the position of the indicator. The figure which showed an example of the time chart when transmitting a parameter The flowchart which showed the flow of the process which the control part 110 performs. The figure which showed an example of the time chart which detects the position of the indicator. The figure which showed an example of the image obtained by the imaging part 170. FIG. The figure which showed an example of the image obtained by the imaging part 170. FIG. The figure which showed an example of the image obtained by the imaging part 170. FIG. The figure which showed an example of the image obtained by the imaging part 170. FIG. The figure which showed an example of the mask area | region. The figure which showed the apparatus which comprises the display system 1B which concerns on a modification.

[Embodiment]
(Configuration of the embodiment)
FIG. 1 is a diagram showing an apparatus constituting a display system 1 according to an embodiment of the present invention.
The display system 1 includes a projector 10 that projects an image on a screen SC (projection surface),
An indicator 20 is provided.

The projector 10 is connected to an external device that supplies a video signal, and projects the video indicated by the video signal supplied from the external device onto the screen SC. Further, the projector 10 has a so-called whiteboard function that detects the position of the indicator 20 to identify the movement locus of the indicator 20 and projects an image corresponding to the movement locus of the indicator 20. The projector 10 is installed obliquely above the screen SC and projects an image toward the screen SC. In the present embodiment, the projector 10 projects an image on the screen SC.
Instead of, an image may be projected onto a wall surface (projection surface).

The pen-type indicator 20 functions as a pointing device for operating the projector 10, and when the user operates a GUI (Graphical User Interface) projected by the projector 10 or when the user uses the whiteboard function. used.

FIG. 2 is a diagram illustrating a hardware configuration of the projector 10 and the indicator 20. The indicator 20 includes a control unit 210, a communication unit 220, a light emitting unit 230, an operation unit 240, and a power source 250. The power source 250 is, for example, a dry battery or a secondary battery, and includes a control unit 210 and a communication unit 220.
Then, power is supplied to the light emitting unit 230 and the operation unit 240. The operation unit 240 includes a switch (not shown) that controls power supply from the power supply 250 to each unit. When the switch of the operation unit 240 is turned on, power is supplied from the power source 250 to each unit, and when the switch of the operation unit 240 is turned off, supply of power from the power source 250 to each unit is stopped. The light emitting unit 230 includes a light emitting diode that emits infrared light. Lighting and extinguishing of the light emitting unit 230 is controlled by the control unit 210. The communication unit 220 includes a light receiving element that receives infrared light. The communication unit 220
Various signals sent by infrared light from the projector 10 are received. The communication unit 220 converts various received signals into electric signals and supplies them to the control unit 210. The control unit 210 includes the light emitting unit 23.
0 and the communication unit 220. The control unit 210 starts control of the light emitting unit 230 according to a signal supplied from the communication unit 220, and controls lighting and extinguishing of the light emitting diode of the light emitting unit 230. The control unit 210 and the light emitting unit 230 function as a light emitting device that causes the indicator 20 to shine.

The projector 10 includes a control unit 110, a storage unit 120, an operation unit 130, and a projection unit 140. In addition, the projector 10 includes a video processing unit 150 and a video interface 160.
The imaging unit 170 and the communication unit 180 are provided. The control unit 110 is a central processing unit (CPU).
A microcomputer including a unit (ROM), a read only memory (ROM), and a random access memory (RAM). When the CPU executes the program stored in the ROM, in the projector 10, the control unit 110 controls each unit and displays the video on the screen SC.
Various functions such as a function for projecting to the screen, a whiteboard function, and a function for using the indicator 20 as a pointing device are realized. The storage unit 120 stores setting values related to the image quality of the projected image and information related to various function settings.

The operation unit 130 includes a plurality of buttons for operating the projector 10. The control unit 110 controls each unit according to the operated button, thereby adjusting an image projected on the screen SC and setting various functions of the projector 10. The operation unit 130 also includes a light receiving unit (not shown) that receives an infrared light signal from a remote controller (not shown). The operation unit 130 converts a signal transmitted from the remote controller into an electric signal and supplies the electric signal to the control unit 110, and the control unit 110 controls each unit according to the supplied signal.

The video interface 160 has a connector such as RCA, D-Sub, or HDMI (registered trademark), and supplies a video signal supplied from an external device to the connector to the video processing unit 150. The video interface 160 is a wireless LAN or Bluetooth (registered trademark).
The video signal may be acquired by wireless communication.

The video processing unit 150 acquires the video signal supplied from the video interface 160. In addition, the video processing unit 150 acquires from the control unit 110 an on-screen image signal that displays a GUI for operating the projector 10, a state of the projector 10, and the like.
The video processing unit 150 has various image processing functions, performs image processing on the video signal supplied from the video interface 160, and adjusts the image quality of the projected video. In addition, when an on-screen image signal is supplied from the control unit 110, the video processing unit 150 supplies a video signal on which the on-screen image signal is superimposed to the projection unit 140.

The projection unit 140 that projects an image includes a light source 141, a light valve 142, a drive circuit 144, and a projection optical system 143. The light source 141 is a lamp that emits light, and the light source 141.
Is emitted into red, green, and blue light by a plurality of dichroic mirrors and mirrors (not shown), and the separated red, green, and blue lights are guided to the light valve 142.
The light source 141 may be a light emitting diode or a semiconductor laser device that emits laser light instead of a lamp.

The drive circuit 144 acquires the video signal supplied from the video processing unit 150. Drive circuit 1
The video signal supplied to 44 includes gradation data representing the gradation of the red component in the projected image,
It has gradation data representing the gradation of the green component in the projected image and gradation data representing the gradation of the blue component in the projected image. The drive circuit 144 extracts gradation data of each color of red, green, and blue, and drives the light valve 142 based on the extracted gradation data of each color.

The light valve 142 includes the above-described liquid crystal light valve on which red light is incident, the above-described liquid crystal light valve on which green light is incident, and the above-described liquid crystal light valve on which blue light is incident.
The liquid crystal light valve is a transmissive liquid crystal panel and includes pixels arranged in a matrix with a plurality of rows and a plurality of columns. A liquid crystal light valve that receives red light is driven based on red gradation data, and a liquid crystal light valve that receives green light is driven based on green gradation data, and a liquid crystal light that receives blue light. The valve is driven based on the blue gradation data. In each liquid crystal light valve, each pixel is controlled by the drive circuit 144, and the transmittance of the pixel changes. By controlling the transmittance of the pixels, the light of each color transmitted through the liquid crystal light valve becomes an image corresponding to each gradation data. The red, green, and blue light images transmitted through the liquid crystal light valve are combined by a dichroic prism (not shown) and are incident on the projection optical system 143. The projection optical system 143 is an optical system that magnifies an incident image, and magnifies the incident image with a lens or a mirror and projects it onto the screen SC.

The imaging unit 170 includes a CMOS imaging device that receives infrared light emitted from the light emitting unit 230, an optical system that forms an image on the imaging device, a diaphragm that restricts light incident on the imaging device, and the like. The imaging unit 170 sets the range including the screen SC as an imaging range, generates an image of the captured range,
An image signal indicating the generated image is output. The communication unit 180 includes a light emitting diode that emits infrared light. The communication unit 180 is controlled by the control unit 110 to turn on and off the light emitting diode, and transmits various signals of infrared light.

FIG. 3 shows the functions realized by the control unit 110 executing the program and the control unit 21.
FIG. 3 is a functional block diagram showing a configuration of functions realized in 0. The distance acquisition unit 111 acquires the distance from the projector 10 to the screen SC. Specifically, the distance acquisition unit 1
11 controls the image processing unit 150 and the projection unit 140 to project a pattern image for measuring the distance from the projector 10 to the screen SC onto the screen SC. Imaging unit 1
When the pattern image is projected onto the screen SC, 70 captures the projected pattern image and outputs an image signal indicating the pattern image. The distance acquisition unit 111 acquires an image signal indicating a pattern image, analyzes the acquired image signal, and transmits a screen SC from the projector 10.
Get the distance to. As a method of obtaining the distance from the projector 10 to the screen SC based on the image indicated by the acquired image signal, there are known techniques such as the technique disclosed in Japanese Patent Application Laid-Open No. 2014-131326. As for the distance from the projector 10 to the screen SC, a distance sensor may be provided in the projector 10 and the distance from the projector 10 to the screen SC may be obtained from the measurement result of the distance sensor. The distance acquisition unit 111 may acquire information related to the distance input by the user operating the remote controller or the operation unit 130 instead of measuring the distance from the projector 10 to the screen SC. Here, the information to be acquired by the distance acquisition unit 111 is not limited to the distance itself, and may be information related to the distance (information corresponding to the distance). For example, when the projector 10 does not have a zoom function, the projector 1
Since the screen size is determined by the distance from 0 to the screen SC, the user may be allowed to input the screen size as information relating to the distance.

The position detection unit 113 detects the position of the indicator 20 using, for example, the time chart shown in FIG. The period for detecting the position of the indicator 20 has four phases from phase P11 to phase P14. When detecting the position of the indicator 20, the phase P11 to the phase P14 are repeated. Phase P11 is a phase for synchronizing the timing at which the projector 10 captures an image with the imaging unit 170 and the timing at which the indicator 20 emits light. In phase P11, the position detection unit 113 controls the communication unit 180 so that an infrared light synchronization signal is output in a predetermined period te1. In the indicator 20, the communication unit 22.
When 0 receives the synchronization signal and a predetermined time elapses after receiving the synchronization signal, the control unit 210 controls the light emitting unit 230 so that the light emitting unit 230 is turned on in the set period te2. In the present embodiment, the light emitting unit 230 from the start time of the phase P12 and the phase P14.
Is controlled to light up.

In phase P12 and phase P14, the position detection unit 113 controls the imaging unit 170 to image a predetermined range including the screen SC at the set shutter speed. Here, when the indicator 20 is located within a predetermined range as an imaging range, the light emitted from the light emitting unit 230 is included in the captured image. The exposure period te3 in which exposure is performed by the electronic shutter function in the imaging unit 170 starts from the start time of the phase P12 and the phase P14, and the time point when the exposure ends is determined by the set shutter speed.
Image signals of images captured by the imaging unit 170 in phase P12 and phase P14 are supplied to the position detection unit 113. The position detection unit 113 analyzes the supplied image signal, and the light emitting unit 23.
The position of the light emitted by 0 is specified, and the specified position is set as the position of the indicator 20. This position is used when the indicator 20 is used as a pointing device or in a whiteboard function.

The parameter transmission unit 112 determines the period te2 based on the distance acquired by the distance acquisition unit 111.
, That is, the time during which the light emitting unit 230 emits light in phase P12 and phase P14 (light emitting time) is acquired, and the acquired light emitting time is transmitted as a parameter for controlling the light emission of the light emitting unit 230. Specifically, the parameter transmission unit 112 inputs the acquired distance into a predetermined calculation formula, and calculates the light emission time using the calculation formula. Parameter transmitter 11
2 transmits the calculated light emission time to the indicator 20 by controlling the communication unit 180. Instead of the calculation formula, the light emission time may be acquired using a lookup table in which the distance and the light emission time are stored in association with each other.

FIG. 5 is a diagram illustrating an example of a time chart when parameters are transmitted from the projector 10 to the indicator 20. The parameter transmission period has three phase groups from phase group P21 to phase group P23. In addition, the phase group P21 is a phase P
The phase group P22 has four phases from 21-1 to the phase P21-4, and the phase group P22 has four phases from the phase P22-1 to the phase P22-4, and the phase group P2
3 has four phases from phase P23-1 to phase P23-4. The time of the three phase groups from the phase group P21 to the phase group P23 is the same time. Further, the time of each phase is also the same time, and the above-described phases P11 to P14 are also the same time.

In the phase group P21, the indicator 2 indicates that the projector 10 starts to transmit parameters.
This is a phase group for informing 0. In this phase group P21, the communication unit 180
By turning on the light emitting diode 4 times, a start signal indicating the start of parameter transmission is transmitted.

The phase group P22 and the phase group P23 are phase groups for transmitting parameters. In this embodiment, the parameter is converted to an 8-bit binary number. The upper 4 bits of the parameter are transmitted in the phase group P22, and the lower 4 bits of the parameter are transmitted in the phase group P23. In the phase group P22 and the phase group P23, one bit of the parameter is transmitted in each phase.

For example, when the parameter value is 70 in decimal, the parameter value becomes “01000110” when converted to binary. The parameter transmission unit 112 sets the upper 4 bits “0100”.
"Is transmitted in the phase group P22, and" 0110 "of the lower 4 bits is transmitted in the phase group P23.

Further, in each phase of the phase group P22 and the phase group P23, 1 bit of 4 bits to be transmitted is transmitted. Specifically, the 8 bits of the parameter are LSB
When the 0th bit, 1st bit,..., 7th bit are set in order, the phase group P22
In phase P22-1, the seventh bit, which is the MSB of the parameter, is transmitted.
In the phase P22-2 of the phase group P22, the sixth bit is transmitted, in the phase P22-3, the fifth bit is transmitted, and in the phase P22-4, 4th bit is transmitted.
The bit is transmitted. In the phase P23-1 of the phase group P23, the third bit of the parameter is transmitted, in the phase P23-2, the second bit is transmitted, in the phase P23-3, the first bit is transmitted, In phase P23-4, the 0th bit which is the LSB of the parameter is transmitted.

In each phase, the communication unit 180 turns on the light emitting diode once when the value of the bit to be transmitted is 0, and lights up the light emitting diode twice when the value of the bit to be transmitted is 1. Let

Next, functions realized in the control unit 210 will be described.
The signal acquisition unit 211 acquires various signals and parameters received by the communication unit 220.
The light emission control unit 212 acquires the synchronization signal from the signal acquisition unit 211, and after the predetermined time has elapsed since the acquisition of the synchronization signal, the light emission unit 230 is turned on in the period te2 in the phase P12 and the phase P14. 230 is controlled. Further, when the signal acquisition unit 211 receives the start signal and the parameter, the light emission control unit 212 changes the length of the period te2, that is, the light emission time of the light emitting unit 230 in the phase P12 and the phase P14, according to the received parameter. To do.

(Operation example of embodiment)
Next, an operation example when setting the light emission amount of the light emitting unit 230 in the embodiment will be described.

FIG. 6 is a flowchart showing a flow of processing when the control unit 110 sets the light emission amount of the light emitting unit 230. First, when the user performs an operation for instructing execution of processing for measuring the distance from the projector 10 to the screen SC with the remote controller, the controller 11
0 controls the video processing unit 150 to project a pattern image for measuring the distance onto the screen SC (step SA1).

When this pattern image is projected on the screen SC, the control unit 110 controls the imaging unit 170 to capture the pattern image (step SA2). When the imaging unit 170 captures a pattern image, an image signal indicating the pattern image is output to the control unit 110. The control unit 110
The image signal supplied from the imaging unit 170 is analyzed, and the screen SC from the projector 10 is analyzed.
Is obtained (step SA3). A method for obtaining a distance from the projector 10 to the screen SC by taking an image for measuring the distance is disclosed in, for example, Japanese Patent Application Laid-Open No. 2014-13.
The technique disclosed in Japanese Patent No. 1326 is used.

When the control unit 110 acquires the distance from the projector 10 to the screen SC, the control unit 110 inputs the acquired distance to a predetermined calculation formula, and when the light emitting unit 230 emits light in the phase P12 and the phase P14 based on the calculation formula. The light emission time, that is, the length of the period te2 is calculated (step SA4). The light emission time is shortened when the distance from the projector 10 to the screen SC is short, and is increased when the distance from the projector 10 to the screen SC is long. The control unit 110 controls the communication unit 180 to transmit the calculated light emission time to the indicator 20 through the phase group P21 to the phase group P23 (step SA5).

In the indicator 20, when the communication unit 220 receives the start signal transmitted in the phase group P21 and the parameters transmitted in the phase group P22 and the phase group P23, the control unit 210
However, according to the received parameter, the period te2 which is the length of the light emission time of the light emission part 230 is set.

Next, when the user uses the whiteboard function, the control unit 110 includes the communication unit 180.
Control and transmit a synchronization signal. When the communication unit 220 receives the synchronization signal, the control unit 21
0 is the period te2 set by the above-described operation in the phase P12 and the phase P14.
The light emission time of the light emitting unit 230 is controlled so that the light emitting unit 230 is turned on.

Thus, when the distance from the projector 10 to the screen SC is short by setting the light emission time of the indicator 20 when the projector 10 detects the position of the indicator 20, the light emitting unit 230 in phase P12 and phase P14. The period te2 when is turned on becomes the period te21 as shown in FIG. 7A, and is longer than the period te21 as shown in FIG. 7B when the distance from the projector 10 to the screen SC is long. Period t
e22.

In the case of a configuration that does not change the light emission time of the light emitting unit 230 according to the distance from the projector 10 to the screen SC, that is, a configuration that does not include the configuration of the present embodiment, as shown in FIG. If the distance from 10 to the screen SC is far, phase P1
2 and phase P14, the amount of light incident on the image sensor from the light emitting unit 230 is reduced. Therefore, in the image of the projection area A1 obtained by the image capturing unit 170, as shown in FIG. The area of the region A2 where the light emitted from the body 20 is reflected is reduced.
On the other hand, as shown in FIG. 9A, when the distance from the projector 10 to the screen SC is short, the amount of light incident on the image sensor from the light emitting unit 230 increases in phase P12 and phase P14. 9B, in the image of the projection area A1 obtained by the imaging unit 170, the area of the area A2 in which the light emitted from the indicator 20 is reflected is large. Thus, when the area of the region where the light emitted from the indicator 20 is reflected increases, the accuracy in detecting the position of the indicator 20 is deteriorated.

On the other hand, in the present embodiment, as shown in FIG. 10A, when the distance from the projector 10 to the screen SC is long, the light emission time of the light emitting unit 230 is set to the period te22 according to the distance. By setting, the amount of light incident on the imaging element from the light emitting unit 230 during the exposure period becomes a predetermined amount of light, so that the projection obtained by the imaging unit 170 as shown in FIG. In the image of the area A1, the area of the area A2 in which the light emitted from the indicator 20 is reflected is a predetermined area.
Further, as shown in FIG. 11A, even if the distance from the projector 10 to the screen SC becomes short, the exposure period is set by setting the light emission time of the light emitting unit 230 to the period te21 according to the distance. In FIG. 11, since the amount of light incident on the image sensor from the light emitting unit 230 is a predetermined amount, as shown in FIG. 11B, in the image of the projection area A1 obtained by the image capturing unit 170, The area of the region A2 in which the light emitted from the indicator 20 is reflected is shown in FIG.
The predetermined area is the same as 0 (b).

As described above, according to the present embodiment, even when the distance from the projector 10 to the screen SC is short, when the light emitted from the indicator 20 on the screen SC is imaged by the imaging unit 170, the indicator 20 Since the area of the region A2 in which the light emitted from is reflected is a predetermined area,
The position of the indicator 20 can be detected with high accuracy.

By the way, in the embodiment, when the imaging unit 170 receives light outside the projection area separately from the light from the light emitting unit 230, it becomes difficult to detect the position of the indicator 20. Therefore, the area outside the area slightly outside the projection area (the area indicated by the dotted line in FIG. 12A) is set as the mask area A3, and the image obtained by the imaging unit 170 is masked by the mask area A3. May be.
When the mask region A3 is provided, the indicator 20 is emitted because the light emission time of the light emitting unit 230 is not set according to the distance from the projector 10 to the screen SC in the configuration that does not include the configuration of the present embodiment. When the area of the region A2 in which light is reflected increases, for example, when the region A2 is at the end of the projection region A1 as shown in FIG. 12B, the region A2 is masked by the mask region A3. It becomes difficult to accurately detect the position of the indicator 20. Mask area A3 so that the space between projection area A1 and mask area A3 is wide.
Is set, the area A2 is not masked, but in this case, the possibility of receiving light outside the projection area increases.
On the other hand, in the present embodiment, according to the distance from the projector 10 to the screen SC,
In order to suppress the area of the region A2 by setting the light emission time of the light emitting unit 230, FIG.
As shown in FIG. 5, even if the area A2 is at the end of the projection area A1, the area A2 is not masked by the mask area A3, and the position of the indicator 20 can be detected with high accuracy.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows. In addition, you may implement each embodiment mentioned above and the following modifications, combining one or more suitably.

(Modification 1)
In the above-described embodiment, the parameter is transmitted from the projector 10 to the indicator 20 using infrared light. However, the parameter is transmitted by communication according to other wireless communication standards such as Bluetooth (registered trademark) or wireless LAN. May be.

(Modification 2)
In the present invention, the imaging unit 170 may be provided with two imaging elements, and the distance from the projector 10 to the screen SC may be obtained by performing triangulation from images obtained by the two imaging elements. Further, in such a configuration in which the distance from the projector 10 to the object is obtained by triangulation, the distance may be obtained by triangulation from the projector 10 to the indicator 20. In the configuration in which the distance from the projector 10 to the indicator 20 is obtained by triangulation, the parameter may be set according to the distance from the projector 10 to the indicator 20. Further, in the configuration in which the distance from the projector 10 to the indicator 20 is obtained, for example, the position of the indicator 20 is detected by the whiteboard function and the indicator 2 is detected.
A distance up to 0 may be acquired, and a parameter may be set according to a change in the distance to the indicator 20.
In the present invention, when the distance from the projector 10 to the indicator 20 is acquired, the distance to the screen SC is acquired by a method of obtaining a projected image by imaging or a distance sensor or the like, and the imaging unit 170 The indicator 20 on the screen SC is obtained from the obtained image.
May be determined, and the distance from the projector 10 to the indicator 20 may be obtained using the acquired distance and the specified position of the indicator 20. According to this configuration, the distance from the projector 10 to the indicator 20 can be obtained without providing two imaging elements.

(Modification 3)
In the above-described embodiment, the indicator 20 has the light emitting unit 23 according to the received parameter.
Although the light emission time is set to 0, the light emission time is fixed, the parameter is the radiation intensity of the light emitted from the light emitting unit 230, and the intensity of the light emitted from the light emitting unit 230 according to the received parameter, that is,
You may make it change the radiation intensity of the light which the light emission part 230 emits. For example, when the distance from the projector 10 to the indicator 20 is short, the light emitted from the light emitting unit 230 is weakened, and when the distance from the projector 10 to the indicator 20 is long, the light emitted from the light emitting unit 230 is strong. To do.
Further, in the present invention, not only one of the light emission time of the light emitting unit 230 and the intensity of light emitted from the light emitting unit 230 but also the light emitting unit 230 according to the distance from the projector 10 to the screen SC or the indicator 20. Both the light emission time and the intensity of light emitted from the light emitting unit 230 may be controlled.

(Modification 4)
In the embodiment described above, the parameters are transmitted by the phase group P22 and the phase group P23, but the configuration for transmitting the parameters is not limited to this configuration.
For example, it is good also as a structure which provides phase P22-1-phase P22-4 and phase P23-1-phase P23-4 after phase P21-1.
Further, a phase group P24 indicating that parameter transmission is completed may be provided after the phase group P22 and the phase group P23.
Also, phase P22-1 to phase P22-4 and phase P23-1 to phase P
In 23-4, when the value of the bit to be transmitted is 0, the light emitting diode is lit once, and when the value of the bit to be transmitted is 1, the light emitting diode is lit twice.
When the value of the bit to be transmitted is 0, the light emitting diode may not be turned on. When the value of the bit to be transmitted is 1, the light emitting diode may be turned on once.

(Modification 5)
In the present invention, a light-emitting device that emits light may be provided to detect the position of an object that reflects light from the light-emitting device. FIG. 14 is a diagram showing an apparatus constituting the display system 1B according to this modification. The display system 1 </ b> B includes a light emitting device 30 connected to the projector 10. The light emitting device 30 includes a light emitting unit that emits light (infrared light in the present modification). The light emitting device 30 is installed above the upper end of the screen SC, and emits light by diffusing light downward in the range of the angle θ. The light emitted from the light emitting device 30 forms a light layer along the screen SC. In this modification, the angle θ reaches approximately 180 degrees, and a light layer is formed on almost the entire screen SC. The surface of the screen SC and the light layer formed by the light emitting device 30 are preferably close to each other.
When a finger, which is an example of an indicator, is brought close to the screen SC in a state where the light emitting device 30 emits light, the light emitted from the light emitting device 30 is reflected by the finger. The projector 10
The reflected light is received by the imaging unit 170, and the position of the finger is specified. The control unit 110 sets a parameter representing the period during which the light emitting device 30 emits light or the intensity of the light emitted from the light emitting device 30 according to the distance from the projector 10 to the screen SC or the indicator 20, and sets the set parameter. Transmit to the light emitting device 30. The light emitting device 30 includes an acquisition unit that acquires parameters;
It has a control part which controls a light emission part according to a parameter, and controls the intensity of light which the light emitting device 30 emits light or the light emission apparatus 30 emits light based on the acquired parameter.

DESCRIPTION OF SYMBOLS 1, 1B ... Display system, 10 ... Projector, 20 ... Indicator, 30 ... Light-emitting device, 11
DESCRIPTION OF SYMBOLS 0 ... Control part, 111 ... Distance acquisition part, 112 ... Parameter transmission part, 113 ... Position detection part, 1
DESCRIPTION OF SYMBOLS 20 ... Memory | storage part, 130 ... Operation part, 140 ... Projection part, 150 ... Image | video processing part, 160 ... Image | video interface, 170 ... Imaging part, 180 ... Communication part, 210 ... Control part, 211 ... Signal acquisition part, 212, 212B ... light emission control unit, 220 ... communication unit, 230 ... light emission unit, 240 ... operation unit, 250 ... power supply, SC ... screen

Claims (5)

A projector system including a projector and an indicator,
The projector is
A projection unit for projecting an image;
An imaging unit for projecting the video and generating an image of a projection surface indicated by the indicator;
A position detection unit that detects a position of the indicator based on the image generated by the imaging unit;
A distance acquisition unit for acquiring information related to the distance to the indicator or the projection plane;
A communication unit that transmits a parameter corresponding to the information acquired by the distance acquisition unit,
The indicator is
A light emitting unit;
An acquisition unit for acquiring the parameter transmitted by the communication unit;
And a control unit that controls a light emission amount of the light emitting unit based on the parameter acquired by the acquisition unit .   The projector system according to claim 1, wherein the parameter indicates a light emission time of the light emitting unit. The projector system according to claim 1 , wherein the parameter indicates a radiation intensity of the light emitting unit. The projector system according to claim 1 , wherein the communication unit transmits a parameter for increasing a light emission amount of the light emitting unit as a distance to the indicator or the projection surface is longer. A method for controlling a projector system comprising a projector and an indicator,
A projection step in which the projector projects an image; and
An imaging step in which the projector generates an image of a projection plane on which the video is projected and indicated by the indicator ;
A position detection step in which the projector detects the position of the indicator based on the image generated in the imaging step;
A distance acquisition step in which the projector acquires information related to the distance to the indicator or the projection plane;
A communication step in which the projector transmits a parameter corresponding to the acquired information;
An acquisition step in which the indicator acquires the parameter;
A control step in which the indicator controls the light emission amount of the light emitting unit based on the parameter acquired in the acquisition step;
A projector system control method comprising:

Images