JP2016004343A - Image projection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image projection system capable of distinguishing images plotted by users for each user.SOLUTION: An image projection system for detecting a position pointed by a pointer on a projection screen on which an image is projected includes: first light emission means for projecting curtain-like light in parallel with the projection screen at a first distance from the projection screen; second light emission means for projecting the curtain-like light in parallel with the projection screen at a second distance longer than the first distance from the projection screen; and light reception means for receiving light projected by the first light emission means and the second light emission means, and reflected by the pointer.

Description

  The present invention relates to an image projection system.

  As one of methods for detecting a position designated by a user on a large display screen such as a projection screen of a projector, an optical sensor determines whether light is reflected or blocked by an indicator such as a finger or a pen. An optical detection method for detection is used. In this method, when a plurality of users draw images on the same display screen, the drawn images may be mixed and cannot be distinguished.

  Therefore, conventionally, in a display device that allows a user to draw characters and figures on a display screen, an operation area for each user is set, and this is displayed as necessary, whereby an image drawn by the user is displayed. Each user is displayed separately (for example, see Patent Document 1).

  However, in the conventional technology described above, when a plurality of users draw images in one operation area, the images are mixed and cannot be distinguished for each user.

  In view of this, an object of the present invention is to provide an image projection system capable of distinguishing images drawn by a plurality of users for each user.

  In one proposal, there is provided an image projection system for detecting a position designated by an indicator with respect to a projection screen on which an image is projected, the curtain being parallel to the projection screen at a first distance from the projection screen. A first light emitting means for projecting light in the form of a light, and a second light projecting curtain-shaped light in parallel with the projection screen at a second distance longer than the first distance from the projection screen. There is provided an image projection system comprising: a light emitting means; and a light receiving means for receiving the light projected by the first light emitting means and the second light emitting means and reflected by the indicator.

  According to one aspect, it is possible to provide an image projection system that can distinguish an image drawn by a user for each user.

1 is a diagram illustrating a schematic configuration of an image projection system according to a first embodiment. 1 is a diagram illustrating a schematic configuration of an image projection system according to a first embodiment. 6 is a timing chart illustrating the operation of the image projection system according to the first embodiment. 1 is a block diagram illustrating a hardware configuration of an image projection system according to a first embodiment. 6 is a flowchart for explaining the operation of the image projection system according to the first embodiment. The figure for demonstrating the effect of the image projection system which concerns on 1st Embodiment. 9 is a flowchart for explaining the operation of the image projection system according to the second embodiment. 10 is a flowchart for explaining the operation of the image projection system according to the third embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, the duplicate description is abbreviate | omitted by attaching | subjecting the same code | symbol.

[First Embodiment]
First, an example of a schematic configuration of the image projection system according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 and 2 are diagrams illustrating a schematic configuration of the image projection system according to the first embodiment.

  In the image projection system according to the first embodiment, as shown in FIG. 1, a position (hereinafter referred to as “indicated coordinate position 52”) designated by the user with the indicator P on the projection screen 51 on which an image is projected. The image projection system detects and draws in accordance with the designated coordinate position 52. As the indicator P, for example, a finger or a rod-shaped member imitating the outer shape of a pen or the like points to the projection screen 51 by the user.

  As shown in FIG. 1, the image projection system according to the first embodiment includes a projector 1 as an example of an image projection apparatus, a first light emitting unit 2 connected to the projector 1, and a second light emitting unit 3. And light receiving means 4.

  The projector 1 projects an image on, for example, the screen 5 or a wall surface based on the image data. In the present embodiment, the image is not limited to a still image, and may be a moving image.

  The first light emitting means 2 is attached to the upper part of the projection screen 51, for example, and is arranged at a first distance L1 from the projection screen 51 so as to cover the entire projection screen 51 in a curtain shape in parallel with the projection screen 51. A light (see the broken line arrow in FIG. 2) is projected onto the light. The light projected by the first light emitting means 2 is reflected by the indicator P when the user instructs the position on the projection screen 51 with the indicator P to block the light path.

  The first distance L1 is not particularly limited as long as it is shorter than the length of the indicator P. However, since the detection accuracy of the position on the projection screen 51 instructed by the indicator P can be increased, the first distance L1 is preferably shorter.

  The light projected by the first light emitting means 2 is preferably infrared light. If infrared light is used as the light projected by the first light emitting means 2, a human being as a user cannot be recognized, so that the projection screen 51 is not affected by the user's vision. In addition, when infrared light is used as the light projected by the first light emitting means 2, the infrared light is dispersed and the detection accuracy of the position on the projection screen 51 indicated by the indicator P deteriorates. Therefore, it is preferable to use laser light with high directivity.

  The second light emitting means 3 is attached to the upper part of the projection screen 51, for example, and is placed in a curtain shape parallel to the projection screen 51 at a second distance L2 longer than the first distance L1 from the projection screen 51. Light (see solid line arrow in FIG. 2) is projected. The light projected by the second light emitting means 3 is routed by the user pointing the position on the projection screen 51 with the pointer P or holding the pointer P in the vicinity of the projection screen 51. When blocked, it is reflected by the indicator P.

  The second distance L2 is not particularly limited as long as it is longer than the first distance L1.

  The light projected by the second light emitting means 3 is preferably infrared light. If infrared light is used as the light projected by the second light emitting means 3, a human being as a user cannot be recognized, so that the projection screen 51 is not affected by the user's vision. In addition, when infrared light is used as the light projected by the second light emitting means 3, the infrared light is dispersed and the detection accuracy of the position on the projection screen 51 indicated by the indicator P deteriorates. Therefore, it is preferable to use laser light with high directivity.

  The light receiving means 4 is projected by the first light emitting means 2 and reflected by the indicator P (hereinafter referred to as “first reflected light”) and the second light emitting means 3, and is projected by the indicator. Light reflected by P (hereinafter referred to as “second reflected light”) is received. The light receiving means 4 is not particularly limited as long as it can receive the wavelength of light projected by the first light emitting means 2 and the second light emitting means 3. As the light receiving means 4, for example, a camera having an image sensor provided with a filter that selectively transmits only the wavelength of light projected by the first light emitting means 2 and the second light emitting means 3 is used. Can do.

  Further, it is preferable that the first light emitting means 2 and the second light emitting means 3 project light having different wavelengths. In this case, the light receiving means 4 is not particularly limited as long as it can distinguish and receive the light projected by the first light emitting means 2 and the light projected by the second light emitting means 3. As the light receiving means 4, for example, a light receiving element having high sensitivity with respect to the wavelength of light projected by the first light emitting means 2 and high with respect to the wavelength of light projected by the second light emitting means 3. The light receiving means 4 including a light receiving element having sensitivity can be suitably used. Thereby, the light receiving means 4 can easily distinguish and receive the light projected by the first light emitting means 2 and the light projected by the second light emitting means 3.

  Also, the timing when the first light emitting means 2 and the second light emitting means 3 project light of a certain pulse width, the first light emitting means 2 projects light, and the timing when the second light emitting means 3 projects light. It is preferable to deviate.

  A method for shifting the timing at which the first light emitting means 2 projects light and the timing at which the second light emitting means 3 projects light will be described with reference to FIG. FIG. 3 is a timing chart illustrating the operation of the image projection system according to the first embodiment. Specifically, FIG. 3 is a timing chart showing the photographing timing of the light receiving means 4, the light projection timing of the first light emitting means 2, and the light projection timing of the second light emitting means 3.

  As shown in FIG. 3, the light receiving unit 4 repeats an operation (on) for photographing with a constant pulse width at every constant time (on) and an operation (off) for not photographing. The first light emitting means 2 performs an operation of projecting light (ON) every time the light receiving means 4 is turned on, for example, in synchronization with the photographing timing of the light receiving means 4. The second light emitting means 3 performs an operation of projecting light (ON) at the timing when the light receiving means 4 is turned on and the first light emitting means 2 is not turned on, for example, in synchronization with the photographing timing of the light receiving means 4. .

  That is, the timing at which the first light emitting unit 2 projects light is shifted from the timing at which the second light emitting unit 3 projects light. For this reason, the light receiving means 4 easily distinguishes and receives light even if the light projected by the first light emitting means 2 and the light projected by the second light emitting means 3 have the same wavelength. be able to.

  In the first embodiment, the configuration in which the light receiving means 4 is connected to the projector 1 has been described. However, the present invention is not limited in this respect, and the light receiving means 4 may be built in the projector 1. .

  Further, the projector 1 includes a system control unit 18 as an example of a control unit for controlling the above-described units.

  Hereinafter, the hardware configuration of the image projection system will be described with reference to FIG. FIG. 4 is a block diagram illustrating a hardware configuration of the image projection system according to the first embodiment.

  The projector 1 includes an external connection unit 11, an operation unit 12, a remote control reception unit 13, a fan control unit 14, a fan 15, a projection unit 16, a light receiving unit control unit 17, a system control unit 18, and a storage Part 19. The projector 1 is connected to a first light emitting means 2, a second light emitting means 3, a light receiving means 4, an external device 6, and the like.

  The external connection unit 11 inputs a video (image) signal from the external device 6, for example, an image output signal from a computer, an HDMI (registered trademark) signal from a video device, a video signal, a wireless LAN, a wired LAN, or the like. Interface.

  The operation unit 12 is a display input unit for displaying various kinds of information and performing setting, operation, and the like of the projector 1.

  The remote control receiver 13 receives a signal from the remote controller 7 and accepts a remote operation.

  The fan control unit 14 controls the fan 15 so that the temperature in the projector 1 becomes a predetermined temperature, for example.

  The projection unit 16 includes, for example, a light source 161, a light source control unit 162, a color wheel 163, a rotation detection unit 164, a CW (Color Wheel) control unit 165, a DMD (Digital Mirror Device) 166, a DMD control unit 167, a projection lens 168, and the like. Have.

  The light source 161 is a light source for image projection such as a solid light source such as a lamp, an LED (Light Emitting Diode), and a semiconductor laser. The light source control unit 162 controls the brightness of the light source 161, lighting / extinguishing, and the like.

  The color wheel 163 performs coloring by rotating a disk or the like color-coded in three colors such as R (red), G (green), and B (blue) at high speed and transmitting light from the light source 161, for example. . The rotation detection unit 164 detects the rotation state of the color wheel 163. The CW control unit 165 controls the rotation of the color wheel 163.

  The DMD 166 is a display element in which a large number of micromirror surfaces (micromirrors) are arranged on a plane. The DMD control unit 167 controls on / off of the micromirror of the DMD 166.

  For example, the projection lens 168 enlarges incident light and projects an image on the projection screen 51.

  The color wheel 163 and the DMD 166 are examples of display elements for image projection, and may be other display elements such as an LCD (Liquid Crystal Display).

  In the projection unit 16, the light emitted from the light source 161 is colored by the color wheel 163, reflected by the DMD 166 whose direction is controlled for each pixel based on the image data to be projected, and projected through the projection lens 168. 51 is irradiated to form an image.

  The light receiving means control unit 17 calculates the designated coordinate position 52 based on the image photographed by the light receiving means 4 and transmits the calculated information to the system control unit 18.

  The system control unit 18 includes, for example, a CPU (Central Processing Unit) and its peripheral circuits, and controls the entire projector 1 by executing a program stored in the storage unit 19, for example. Further, the system control unit 18 controls the operations of the first light emitting means 2 and the second light emitting means 3. Specifically, the system control unit 18 controls the timing of projecting light by the first light emitting unit 2 and the second light emitting unit 3 in accordance with the photographing timing of the light receiving unit 4.

  Further, the system control unit 18 generates an image to be projected by superimposing the image drawn at the designated coordinate position 52 calculated by the light receiving unit control unit 17 and the image input from the external connection unit 11, The generated image is projected onto the projection screen 51 by the projection unit 16.

  The storage unit 19 includes, for example, a RAM (Random Access Memory), a flash ROM (Read Only Memory), and / or a storage, and stores various programs of the projector 1, image data to be projected, various setting data, and the like.

  Next, the operation of the image projection system according to the first embodiment will be described with reference to FIG. FIG. 5 is a flowchart for explaining the operation of the image projection system according to the first embodiment.

  First, the system control unit 18 controls the operations of the first light emitting means 2 and the second light emitting means 3 so as to turn on the first light emitting means 2 and the second light emitting means 3 (step S101). More specifically, the system control unit 18 operates the first light emitting unit 2 so as to project curtain-like light parallel to the projection screen 51 at a first distance L1 from the projection screen 51. To control. Further, the system control unit 18 sets the second light emission so as to project curtain-like light in parallel with the projection screen 51 at a second distance L2 longer than the first distance L1 from the projection screen 51. The operation of the means 3 is controlled.

  Subsequently, the system control unit 18 determines whether the light receiving unit 4 has detected the second reflected light by the light receiving unit control unit 17 (step S102).

  In step S102, when the light receiving means 4 has not detected the second reflected light, the system control unit 18 repeats step S102.

  In step S102, when the light receiving unit 4 detects the second reflected light, the system control unit 18 controls the operation of the light receiving unit 4 by the light receiving unit control unit 17 so as to track the detection position. Further, the system control unit 18 compares the difference between the detection position detected in step S102 and the detection position detected at the photographing timing immediately after the light receiving means 4, and if the difference is small, the detection position is Are determined to belong to the same user and are associated (step S103).

  Subsequently, the system control unit 18 determines whether the light receiving unit 4 continues to detect the second reflected light by the light receiving unit control unit 17 (step S104).

  In step S104, when the second reflected light is detected in the vicinity of the detection position detected at the photographing timing of the immediately preceding light receiving means 4, the system control unit 18 recognizes the locus drawn by the same user. To do.

  If the second reflected light is not detected in the vicinity of the detection position detected at the photographing timing immediately before the light receiving unit 4 in step S104, the system control unit 18 once finishes drawing. And the user's association is terminated (step S107). Then, after the end of user association, the system control unit 18 returns to step S102.

  Subsequently, the system control unit 18 determines whether the light receiving unit 4 has detected the first reflected light by the light receiving unit control unit 17 (step S105).

  In step S105, if the light receiving unit 4 has not detected the first reflected light, the system control unit 18 returns to step S104.

  In step S105, when the light receiving unit 4 detects the first reflected light, the system control unit 18 draws the detection position of the first reflected light as a locus on the projection screen 51 (step S106).

  Next, operations and effects of the image projection system of the first embodiment will be described with reference to FIG. FIG. 6 is a diagram for explaining the effect of the image projection system according to the first embodiment.

  Hereinafter, a case where two users, user A and user B, simultaneously draw on the projection screen 51 with their fingers will be described. Note that the image that the user A intends to draw is set to be bold, and the image that the user B intends to draw is set to be thin.

  For example, when the user A draws the character “A” and the user A draws the first stroke, the first stroke is drawn in bold on the projection screen 51. Subsequently, when the user A finishes drawing the first stroke and the user A starts drawing the second stroke, the user A's finger once projects the projection screen 51 between the first stroke drawing and the second stroke drawing. Get away from. For this reason, whether the user A or the user B is drawing the second stroke is not accurately recognized, it is recognized that the user B has drawn, and the second stroke is drawn in fine characters. There is. The same applies to the third stroke.

  That is, it may be erroneously recognized that the user B has drawn a part of the character “A” even though the user A has drawn all the characters “A”.

  However, in the image projection system according to the first embodiment, the first light emitting unit 2 that projects a curtain-like light parallel to the projection screen 51 at a first distance L1 from the projection screen 51, and the projection screen The second light emitting means 3 for projecting curtain-like light in parallel with the projection screen 51 at a second distance L2 longer than the first distance L1 from the first light emitting means 2, the first light emitting means 2 and the second light emitting means 2. Light receiving means 4 for receiving the light projected by the light emitting means 3 and reflected by the indicator.

  Therefore, while the user A is drawing the first image on the projection screen 51, the locus of the finger of the user A can be traced by the first light emitting unit 2 and the light receiving unit 4. Also, while the user A has finished drawing the first stroke and the user A's finger is once away from the projection screen 51, the user A's finger trajectory is tracked by the second light emitting means 3 and the light receiving means 4. Can do.

  That is, when a plurality of users draw handwritten characters with the fingers on the projection screen 51 of the image projection system, the user draws even if the fingers are temporarily separated from the projection screen 51 for each stroke of the characters. The images (characters) thus made can be distinguished for each user.

  As described above, according to the image projection system according to the first embodiment, the first light emitting unit that projects the curtain-shaped light parallel to the projection screen at a first distance from the projection screen; Second light emitting means for projecting curtain-like light in parallel with the projection screen at a second distance longer than the first distance from the projection screen, first light emitting means and second light emitting means And a light receiving means for receiving light reflected by the indicator. For this reason, the image drawn by the user can be distinguished for each user.

[Second Embodiment]
Next, an image projection system according to a second embodiment of the present invention will be described.

  In the image projection system according to the second embodiment, the first light emitting unit 2 is set so that the system control unit 18 turns off the first light emitting unit 2 until the light receiving unit 4 receives the second reflected light. This is different from the image projection system according to the first embodiment in that the operation is controlled.

  Due to the above differences, according to the image projection system according to the second embodiment, it is not necessary to always operate the first light emitting unit 2 in the on state, and the power consumption can be reduced.

  The image projection system according to the second embodiment has the same configuration as that of the image projection system according to the first embodiment except for the above differences. For this reason, in the following description, it demonstrates focusing on the point which is different from 1st Embodiment.

  FIG. 7 is a flowchart for explaining the operation of the image projection system according to the second embodiment.

  First, the system control unit 18 controls the operation of the second light emitting means 3 so as to turn on the second light emitting means 3 (step S201). More specifically, the system control unit 18 places a second distance L2 longer than the first distance L1 from the projection screen 51, and projects curtain-like light in parallel with the projection screen 51. The operation of the second light emitting means 3 is controlled.

  Subsequently, the system control unit 18 executes determination of the detection of the second reflected light (step S202) and user association (step S203), similarly to step S102 and step S103 of the first embodiment.

  Subsequently, the system control unit 18 controls the operation of the first light emitting means 2 so as to turn on the first light emitting means 2 (step S204). More specifically, the system control unit 18 operates the first light emitting unit 2 so as to project curtain-like light parallel to the projection screen 51 at a first distance L1 from the projection screen 51. To control.

  Subsequently, the system control unit 18 determines the detection of the second reflected light (step S205) and the determination of the detection of the first reflected light (step S205), similarly to step S104, step S105, and step S106 of the first embodiment. Step S206) and drawing (step S206) are executed.

  In step S205, if the second reflected light is not detected in the vicinity of the detection position detected at the photographing timing immediately before the light receiving means 4, the system control unit 18 uses the first light emitting means. The operation of the first light emitting means 2 is controlled so as to turn off 2 (step S208). Furthermore, the system control unit 18 determines that the user has once finished drawing, and ends the user's association (step S209). Then, after the user's association is completed, the system control unit 18 returns to step S202.

  As described above, according to the image projection system according to the second embodiment, the first light emitting unit that projects the curtain-like light parallel to the projection screen at a first distance from the projection screen; Second light emitting means for projecting curtain-like light in parallel with the projection screen at a second distance longer than the first distance from the projection screen, first light emitting means and second light emitting means And a light receiving means for receiving light reflected by the indicator. For this reason, the image drawn by the user can be distinguished for each user.

  In particular, in the second embodiment, the system control unit controls the first light emitting unit so that the first light emitting unit does not project light when the light receiving unit does not receive the second reflected light. It is not necessary to always operate the first light emitting means in the on state, and power consumption can be reduced.

[Third Embodiment]
Next, an image projection system according to a third embodiment of the present invention will be described.

  In the image projection system according to the third embodiment, the second light emitting unit 3 is configured such that the system control unit 18 turns off the second light emitting unit 3 while the light receiving unit 4 receives the first reflected light. This is different from the image projection system according to the second embodiment in that the operation is controlled.

  Due to the above differences, according to the image projection system of the third embodiment, it is not necessary to always operate the second light emitting unit 3 in the on state, and the power consumption can be reduced.

  The image projection system according to the third embodiment has the same configuration as that of the image projection system according to the second embodiment except for the above differences. For this reason, in the following description, it demonstrates focusing on the point which is different from 2nd Embodiment.

  FIG. 8 is a flowchart for explaining the operation of the image projection system according to the third embodiment.

  First, similarly to steps S201 to S206 in the second embodiment, the system control unit 18 turns on the second light emitting unit 3 (step S301) to determines the detection of the first reflected light (step S306). Execute.

  In step S306, if the light receiving means 4 has not detected the first reflected light, the system control unit 18 controls the operation of the second light emitting means 3 so as to turn on the second light emitting means 3. (Step S311), the process returns to step S305.

  In step S306, when the light receiving means 4 detects the first reflected light, the system control unit 18 controls the operation of the second light emitting means 3 so that the second light emitting means 3 is turned off ( Step S307). Then, the system control unit 18 draws the detection position of the first reflected light as a locus on the projection screen 51 (step S308).

  In step S305, if the second reflected light is not detected in the vicinity of the detection position detected at the photographing timing immediately before the light receiving means 4, the system control unit 18 uses the first light emitting means. The operation of the first light emitting means 2 is controlled so as to turn off 2 (step S309). Furthermore, the system control unit 18 determines that the user has once finished drawing, and ends the user's association (step S310). Then, after the user's association is completed, the system control unit 18 returns to step S302.

  As described above, according to the image projection system according to the third embodiment, the first light emitting unit that projects the curtain-like light parallel to the projection screen at a first distance from the projection screen; Second light emitting means for projecting curtain-like light in parallel with the projection screen at a second distance longer than the first distance from the projection screen, first light emitting means and second light emitting means And a light receiving means for receiving light reflected by the indicator. For this reason, the image drawn by the user can be distinguished for each user.

  In particular, in the third embodiment, when the light receiving means receives the first reflected light, the system control unit controls the second light emitting means so that the second light emitting means does not emit light. It is not necessary to always operate the second light emitting means in the on state, and power consumption can be reduced.

  The image projection system has been described above by way of the embodiment. However, the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Projector 2 1st light emission means 3 2nd light emission means 4 Light reception means 18 System control part 51 Projection screen L1 1st distance L2 2nd distance P Indicator

JP 2013-130915 A

Claims (6)

An image projection system for detecting a position designated by an indicator with respect to a projection screen on which an image is projected,
A first light emitting means for projecting curtain-shaped light parallel to the projection screen at a first distance from the projection screen;
A second light emitting means for projecting curtain-shaped light in parallel with the projection screen at a second distance longer than the first distance from the projection screen;
A light receiving unit configured to receive light projected by the first light emitting unit and the second light emitting unit and reflected by the indicator. A control unit for controlling operations of the first light emitting unit and the second light emitting unit;
The controller is
When the light receiving means is projected by the second light emitting means and does not receive the light reflected by the indicator, the first light emitting means is prevented from projecting light. Control,
The image projection system according to claim 1. A control unit for controlling operations of the first light emitting unit and the second light emitting unit;
The controller is
When the light receiving means emits light emitted from the first light emitting means and receives light reflected by the indicator, the second light emitting means is controlled so as not to emit light. To
The image projection system according to claim 1 or 2. The first light emitting means and the second light emitting means project light of different wavelengths;
The image projection system according to any one of claims 1 to 3. A control unit for controlling operations of the first light emitting unit and the second light emitting unit;
The controller is
The first light emitting means and the second light emitting means project light having a constant pulse width,
Controlling the first light emitting means and the second light emitting means so as to shift the timing at which the first light emitting means emits light and the timing at which the second light emitting means emits light;
The image projection system according to any one of claims 1 to 3. The indicator is a finger or a rod-shaped member.
The image projection system according to any one of claims 1 to 5.