JP2016012854A - Projection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection system with which a presenter can make presentation that a viewer who pays attention to a sub-screen can easily understand.SOLUTION: A projection system includes: a first projector having a camera photographing a projected image in a main screen and an irradiation point by a laser pointer; a control section which detects the irradiation point in response to the photographed image and performs projective transformation of a coordinate of the irradiation point; and a second projector for generating the pointer by using an OSD function in response to the projectively transformed coordinate.

Description

  The present invention relates to a projection system.

  2. Description of the Related Art A projection system that projects images and the like on a plurality of screens using two or more projectors when a presenter makes a presentation to a large number of viewers is known. At this time, the presenter points the explanation portion with a laser pointer or the like and displays the irradiation point on the main screen so that the viewer can easily understand.

  A projector is disclosed in which a pointer image is displayed on a main screen in response to a key operation of a remote control, and a plurality of separate display devices receive commands via a communication line to display the pointer image on a sub screen. (For example, refer to Patent Document 1).

  However, in the conventional projection system, it is difficult to display the irradiation point displayed on the main screen on the sub screen in real time.

  Since the projector described in Patent Document 1 cannot generate the pointer image displayed on the sub-screen by itself, a time lag occurs when the pointer image is displayed between the main screen and the sub-screen. There are concerns.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a projection system in which a presenter can make an easy-to-understand presentation even for a viewer who pays attention to a sub-screen. .

  The projection system of the present embodiment detects a projection point based on a first projector provided with a camera that captures a projection image on a main screen and an irradiation point by a laser pointer, and coordinates of the irradiation point. It is a requirement to have a control unit that performs projective conversion and a second projector that generates a pointer using the OSD function based on the coordinates subjected to the projective conversion.

  According to the present embodiment, it is possible to provide a projection system in which a presenter can make an easy-to-understand presentation for a viewer who pays attention to a sub-screen.

It is a figure which shows an example of schematic structure of the projection system which concerns on this Embodiment. It is a figure which shows an example of schematic structure of the single plate type | mold DLP projector which concerns on this Embodiment. It is a figure which shows an example of schematic structure of the projection system which concerns on this Embodiment. It is a figure which shows an example of schematic structure of the projection system which concerns on this Embodiment. It is a figure which shows an example of the pattern for projective transformation for the projective transformation coefficient calculation which concerns on this Embodiment. It is a figure which shows an example of schematic structure of the color wheel which concerns on this Embodiment. It is a figure which shows an example of the imaging | photography timing of the camera which concerns on this Embodiment. 3 is a control flowchart according to the present embodiment. 3 is a control flowchart according to the present embodiment. 3 is a control flowchart according to the present embodiment.

<Configuration of projection system>
FIG. 1 is an example of a schematic configuration of a projection system according to the present embodiment.

  As shown in FIG. 1, a projection system 3100 includes a projector (first projector) 10, a projector (second projector) 20, a control unit (external control PC (personal computer)) 30, a main screen 110, and a sub-screen 120. , Etc. A main screen 110 is provided corresponding to the projector 10, and a sub-screen 120 is provided corresponding to the projector 20.

  The control unit 30 is connected to the projector 10 and the projector 20 via the communication network 40. The communication network 40 is not particularly limited as long as it is a network that can communicate with each other, and examples thereof include a LAN and a WAN. The communication network 40 may be wireless or wired, or may be a dedicated line.

  The projectors 10 and 20 are well-known single-plate DLP (Digital Light Processing) projectors (registered trademark). As shown in FIG. 2, in a single-plate DLP projector, light emitted from a light source passes through a color wheel, and is condensed on a DMD (Digital Micromirror Device) through a light tunnel, a relay lens, a cylinder mirror, and a concave mirror. . An image generated by DMD is projected onto a screen through a projection lens.

  The projector 10 enlarges and projects an image, characters, and the like on the main screen 110 based on an image signal (projected image signal, etc.) output from the control unit 30. At this time, the presenter 3200 points the projection image with the laser pointer 100 so that the viewer 3300 can easily understand, and displays the irradiation point 50 on the main screen.

  The projector 10 includes a camera 200, and the camera 200 captures a projected image on the main screen 110 and an irradiation point 50 by the laser pointer 100. Examples of the projected image include a presentation material stored in the PC of the presenter 3200, a projection conversion pattern for calculating a projection conversion coefficient, and the like. The projector 10 transfers the captured image to the control unit 30 via the communication network 40.

  Note that the camera 200 may be installed outside the projector 10, but in this case, the camera 200 is preferably installed at a position that does not block the view of the viewer 3300.

  The projector 20 enlarges and projects an image, characters, and the like on the sub-screen 120 based on the image signal (projection image signal, etc.) output from the control unit 30. Further, the projector 20 generates a pointer by using an OSD (On-Screen-Display) function based on a signal (projection-transformed coordinates) transferred from the control unit 30 (or the projector 10). For example, the projector 20 changes the color of surrounding pixels in the projective transformed coordinates to a bright color that is easy to identify, and generates a pointer. Further, the projector 20 projects the pointer on the sub screen 120. The pointer refers to an irradiation point to be displayed on the sub screen 120 in correspondence with the irradiation point 50 displayed on the main screen 110.

  The control unit 30 is a presenter 3200, an external control PC (personal computer) of the viewer 3300, a video output device, and the like, and outputs an image signal to the projector 10 and the projector 20 via the communication network 40. Further, the control unit 30 detects the irradiation point 50 based on the captured image transferred from the projector 10 and extracts the coordinates of the irradiation point (for example, coordinates (x ′, y ′)). Thereafter, the control unit 30 performs projective transformation on the coordinates of the irradiation point using the projection transformation pattern, and the projected coordinate (for example, coordinates (x, y)) is transmitted via the communication network 40 to the projector 20. To a built-in memory (for example, a hard disk drive (HDD)).

  Further, the control unit 30 controls the timing at which the camera 200 captures the irradiation point 50 based on the synchronization signal output from the projector 10. The synchronization signal is a signal indicating the timing at which the color wheel having a plurality of color segments provided in the projector 10 rotates, for example, when light emitted from the light source passes through the color wheel, at a position corresponding to the synchronization signal sensor. This is a signal indicating the color of an existing segment. The control unit 30 includes a period in which the color wheel rotates in a segment color (for example, green, blue, cyan) in which the color (for example, red) of the irradiation point 50 stands out, and a period in which the camera 200 captures the irradiation point 50. Synchronize.

  That is, the control unit 30 detects the irradiation point 50 based on the photographed image during the period in which the synchronization signal is output from the projector 10, so that the color information of the irradiation point 50 (any RGB channel signal) is obtained. It can be specifically detected. Thereby, the control unit 30 can detect the irradiation point with high accuracy.

  Note that the control unit 30 can also transfer the projection-transformed coordinates to the projector 10 via the communication network 40. In this case, the projector 10 further transfers the coordinates to the projector 20 via the wireless LAN.

  According to the projection system 3100 according to the present embodiment, the control unit 30 calculates the coordinates of the irradiation point based on the photographed image photographed by the camera 200 provided in the projector 10, and the projector 20 based on the coordinates. Generates a pointer. Thereby, the projection system 3100 can display the irradiation point displayed on the main screen 110 also on the sub screen 120 in real time. Therefore, the presenter can use the projection system 3100 when giving presentations to a large number of viewers, and can make a presentation that is easy to understand even for viewers who pay attention to the sub-screen.

<Hardware configuration of projection system>
2 and 3 are examples of the hardware configuration of the projection system 3100 according to this embodiment.

  As shown in FIG. 2, the projector 10 includes a DLP optical system 11, a DLP image processing unit 12, a built-in memory, and the like. The projector 20 also includes a DLP optical system 21, a DLP image processing unit 22, a built-in memory, and the like.

  Projector 10 outputs a synchronization signal to control unit 30. The control unit 30 captures the projection image and the irradiation point 50 at an appropriate timing, detects the irradiation point 50, calculates the coordinates of the irradiation point 50, and outputs it to the projector 20. The projector 20 generates a pointer using the OSD function and projects it on the sub-screen 120.

  The hardware configuration of the projection system 3100 will be described in more detail with reference to FIG. As shown in FIG. 3, the projector 10 includes an image signal input processing unit 13, an image processing unit 14, a device drive control unit 15, a DMD 16, a light source 17, a synchronization signal output unit 18, a color wheel 300a, and the like. The projector 20 also includes an image signal input processing unit 23, an OSD pointer generation unit 24, a device drive control unit 25, a DMD 26, a light source 27, a synchronization signal output unit 28, a color wheel 300b, and the like. The control unit 30 includes an imaging control unit 31, a camera module 32, an irradiation point detection unit 33, a coordinate calculation unit 34, a coordinate transfer unit 35, and the like.

  Digital signals such as HDMI (registered trademark) (High-Definition Multimedia Interface) and analog signals such as VGA (Video Graphics Array) and component signals are input to the projector 10 and the projector 20. The

  The image signal input processing unit 13 (image signal input processing unit 23) performs appropriate processing on the input signal, and sends the processed signal to the image processing unit 14 (OSD pointer generation unit 24). Is output. For example, when the input signal is a digital signal, the image signal input processing unit 13 (image signal input processing unit 23) converts the input signal into a bit format defined by the image processing unit 14 according to the number of bits, and The data is output to the processing unit 14 (OSD pointer generation unit 24). Further, for example, when the input signal is an analog signal, the image signal input processing unit 13 (image signal input processing unit 23) performs a DAC process on the analog signal and outputs a format signal such as an RGB signal or a YPbPr signal. And output to the image processing unit 14 (OSD pointer generation unit 24).

  The image processing unit 14 performs digital image processing according to the characteristics of the drive system, and outputs the generated signal to the device drive control unit 15. For example, a signal indicating a scaler function such as contrast, brightness, saturation, hue, RGB gain, sharpness, and enlargement / reduction is generated, and the signal is output to the device drive control unit 15. In addition, for example, the image processing unit 14 generates an image signal of an arbitrarily designated or arbitrarily registered layout, and outputs the signal to the device drive control unit 15.

  The OSD pointer generation unit 24 generates a pointer using the OSD function based on the projection-transformed coordinates, and outputs the generated pointer to the device drive control unit 25.

  The device drive control unit 15 (device drive control unit 25) determines drive conditions such as the color wheel 300, DMD, and light source, and sends control signals to the color wheel 300a (color wheel 300b), DMD 16 (DMD 26), and light source 17. (Light source 27) and output to the synchronization signal output unit 18 (synchronization signal output unit 28).

  The imaging control unit 31 outputs to the camera module 32 a control signal for controlling the timing at which the camera 200 captures the irradiation point 50 based on the synchronization signal. In addition, the imaging control unit 31 performs shading correction, Bayer conversion, color correction, and the like on the signal subjected to the image processing, and outputs an RGB signal to the camera module 32.

  The irradiation point detection unit 33 detects the irradiation point 50 by the laser pointer 100 based on the photographed image, extracts the coordinates of the irradiation point 50, and outputs the coordinates to the coordinate calculation unit 34.

  The coordinate calculation unit 34 calculates a projection conversion coefficient H based on the projection conversion pattern (see FIG. 4), performs projective conversion of the coordinates of the irradiation point 50, and outputs the coordinates to the coordinate transfer unit 35.

  The coordinate transfer unit 35 transfers the projection-transformed coordinates to the OSD pointer generation unit 24. The coordinates are temporarily stored in an OSD memory provided in the projector 20 or the like.

<Camera shooting timing>
FIG. 6 shows an example of a schematic configuration of the color wheel 300, and FIG. 7 shows a relationship between the segment color of the color wheel 300 and the shooting timing of the camera 200.

  As shown in FIG. 6, the color wheel 300 has seven segments, and the order of the segment colors is red, magenta, yellow, green, blue, cyan, and white. Note that the number of color wheel segments, the color order, and the like are not particularly limited because they differ depending on the projector.

  For example, as shown in FIG. 7, when the color of the laser light (irradiation point) irradiated from the laser pointer 100 to the main screen 110 is red, the shooting timing of the camera 200 is timing A. That is, the control unit 30 captures the irradiation point during the period in which the color of the segment of the color wheel 300 is green, blue, and cyan (the color of the segment where the red irradiation point stands out) that does not include the red wavelength region. Synchronize the period to be performed.

  For example, as shown in FIG. 7, when the color of the laser beam (irradiation point) irradiated from the laser pointer 100 to the main screen 110 is green, the shooting timing of the camera 200 is timing B. That is, the control unit 30 determines that the color of the segment of the color wheel 300 is red and magenta (the color of the segment where the green irradiation point stands out) that does not include the green wavelength region, and the period during which the camera 200 captures the irradiation point. And synchronize.

  For example, as illustrated in FIG. 7, when the color of the laser light (irradiation point) irradiated from the laser pointer 100 to the main screen 110 is blue, the shooting timing of the camera 200 is timing C. That is, the control unit 30 has a period in which the color of the segment of the color wheel 300 is yellow or green (a segment color in which a blue irradiation point stands out) that does not include the green wavelength region, and a period in which the camera 200 captures the irradiation point. And synchronize.

  That is, in the single-plate DLP projector that superimposes the projected colors in time sequence, the control unit 30 captures the irradiation point with the camera in synchronization with the period during which the specific color is developed. The light at the irradiation point with high light intensity can be specifically detected. Thereby, the projection system 3100 can perform irradiation point detection with high accuracy.

<Control flow chart>
8 to 10 are diagrams showing an example of a control flowchart in the projection system 3100 according to the present embodiment.

  The control flowchart shown in FIG. 8 is executed by the projector 10, for example.

  In step S <b> 1, the projector 10 projects an image on the main screen 110 based on image signals from various input interfaces.

  In step S <b> 2, the projector 10 projects a projection conversion pattern for calculating the projection conversion coefficient onto the main screen 110.

  In step S <b> 3, the projector 10 captures an image projected on the main screen 110 (for example, a presentation material, a projection conversion pattern, etc.) and an irradiation point 50 by the laser pointer 100.

  In step S <b> 4, the projector 10 transfers the captured image to the control unit 30.

  The control flowchart shown in FIG. 9 is executed by the control unit 30, for example.

  In step S5, the control unit 30 detects the irradiation point 50 based on the photographed image.

  In step S6, the control unit 30 calculates a projective conversion coefficient H based on the projective conversion pattern, and performs projective conversion on the coordinates of the irradiation point.

  In step S <b> 7, the control unit 30 transfers the projection-transformed coordinates to the projector 20.

  The control flowchart shown in FIG. 10 is executed by the projector 20, for example.

  In step S <b> 8, the projector 20 projects an image on the sub screen 120 based on image signals from various input interfaces.

  In step S9, the projector 20 calls up the projection-transformed coordinates temporarily stored in the OSD memory or the like.

  In step S10, the projector 20 generates a pointer using the OSD function based on the projective transformed coordinates.

  By operating each projector and control unit based on the control flowchart described above, the projection system according to the present embodiment allows the pointer corresponding to the irradiation point displayed on the main screen to be displayed on the sub screen in real time. It can be displayed.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment, and within the scope of the gist of the embodiment of the present invention described in the claims, Various modifications and changes are possible.

10 Projector (first projector)
20 Projector (second projector)
30 Control Unit 100 Laser Pointer 110 Main Screen 120 Sub Screen 200 Camera 300 Color Wheel 3100 Projection System

JP 2009-157407 A

Claims (7)

A first projector comprising a camera for photographing a projected image on a main screen and an irradiation point by a laser pointer;
A control unit for detecting the irradiation point based on a captured image and projectively converting the coordinates of the irradiation point;
And a second projector that generates a pointer using the OSD function based on the projective transformed coordinates. The first projector transfers the captured image to the control unit,
The projection system according to claim 1, wherein the control unit transfers the projection-transformed coordinates to the second projector. The first projector transfers the captured image to the control unit,
The control unit transfers the projection-transformed coordinates to the first projector, and further, the first projector transfers the coordinates to the second projector. Projection system.   The projection system according to any one of claims 1 to 3, wherein the second projector projects the pointer onto a sub-screen. The first projector includes a color wheel having a plurality of color segments,
The controller is
The period in which the first projector projects an image on the main screen with a segment color in which the color of the irradiation point stands out and the period in which the camera captures the irradiation point are synchronized. The projection system according to claim 4. The controller is
During the period when the synchronization signal is output from the first projector,
The projection system according to claim 1, wherein the irradiation point is detected based on the captured image.   The projection system according to claim 1, wherein the photographed image and the projection-transformed coordinates are transferred via a wireless LAN.

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