JP2016057343A - Projection system, projection device, and projection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection system capable of suppressing power consumption.SOLUTION: A projection system including: an illumination device having a dimmable illumination light source; and a projection device for projecting an image includes: projection means for projecting an image with light emitted from a projection light source; imaging means for imaging an area including at least a part of the projection image projected by the projection means; and control means for performing control such that the dimming factor of the illumination light source or the light quantity of the projection light source is lowered on the basis of a luminance difference between a projection image area and any area other than the projection image area in a pickup image imaged by the imaging means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection system, a projection apparatus, and a projection method.

  2. Description of the Related Art An illumination device that automatically controls brightness in conjunction with an image projected by a projection device installed indoors is known. For example, a lighting device is disclosed that includes a detection unit that detects a luminance distribution in a room, and a control unit that performs dimming control on the light source of the appliance body based on a luminance difference in the luminance distribution detected by the detection unit. (For example, refer to Patent Document 1).

  According to such an illuminating device, the brightness of the room is automatically controlled according to the projected image, so that the projected image is easy to see and the fatigue of the user's eyes is reduced.

  However, when the brightness of the image projected by the projection device is set high, the illumination device is also controlled to become bright, and the power consumption in the entire projection environment including the projection device and the illumination device increases. There is a possibility.

  The present invention has been made in view of the above, and an object thereof is to provide a projection system capable of suppressing power consumption.

  According to one aspect of the present invention, there is provided a projection system having an illumination device having a dimmable illumination light source and a projection device for projecting an image, and projecting the image with light emitted from the projection light source. And an imaging unit that captures an area including at least a part of a projection image projected by the projection unit, and a luminance difference between a projected image area and an outside projection image area in the captured image captured by the imaging unit. And a control means for controlling the dimming degree of the illumination light source or the light amount of the projection light source to decrease.

  According to the embodiment of the present invention, a projection system capable of suppressing power consumption is provided.

It is a figure which illustrates the structure of the projection system which concerns on embodiment. It is a block diagram which illustrates the composition of the illuminating device concerning an embodiment. It is a block diagram which illustrates the composition of the projection device concerning an embodiment. It is a figure which illustrates the flowchart of the projection process in embodiment. It is a figure which illustrates the imaging region of the camera in an embodiment. It is a figure which illustrates the flowchart of the projection process in embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

(Projection system)
FIG. 1 is a diagram illustrating a configuration of a projection system 1 according to the embodiment.

  As shown in FIG. 1, the projection system 1 includes illumination devices 20 a and 20 b provided on the ceiling of a room 10, a projection device 30 that projects an image, and a dimming control device 50.

  Each of the lighting devices 20a and 20b (hereinafter sometimes simply referred to as the lighting device 20) has a dimmable illumination light source and is provided on the ceiling of the room 10. Note that the number and installation positions of the lighting devices 20 provided in the room 10 are not limited to the configuration illustrated in FIG. 1. For example, the number of lighting devices 20 provided in the room 10 may be one or more. Moreover, the illuminating device 20 may be provided in the wall surface and floor of the room 10, and may be a hanging type or a stand type.

  The projection device 30 projects an image transmitted from, for example, a PC or a video camera connected by wire or wirelessly on the screen 40 or the like.

  The light control device 50 is, for example, a PC (personal computer), and is connected to the illumination device 20 and the projection device 30 via the network 60. The dimming control device 50 sets the dimming degree of the lighting device 20 by, for example, the projection device 30, a PC or a portable terminal (not shown), and controls the lighting device 20 to the set dimming degree.

  Here, the dimming degree is a duty of a PWM signal that controls light emission of the illumination light source of the illumination device 20, and is represented by a numerical value of 0 to 100%. The illumination light source of the illumination device 20 becomes darker as the dimming degree is lower, and becomes brighter as the dimming degree is higher.

  The network 60 is, for example, the Internet or a LAN (Local Area Network), and the system is not limited as long as the illumination device 20, the projection device 30, and the light control device 50 can communicate with each other. The network 60 may be wired or wireless, or a combination of wired and wireless.

(Lighting device)
Next, the configuration of the lighting device 20 will be described. FIG. 2 is a diagram illustrating the configuration of the illumination device 20 according to the embodiment.

  As illustrated in FIG. 2, the lighting device 20 includes a control circuit 210, a communication I / F 220, an AC / DC converter 230, a dimming circuit 240, and an LED 250.

  The control circuit 210 generates a PWM signal corresponding to the dimming degree set from the dimming control device 50 via the communication I / F 220, and transmits the generated PWM signal to the dimming circuit 240.

  The communication I / F 220 is hardware for connecting the lighting device 20 to the network 60. The communication I / F 220 receives the dimming degree from the dimming control device 50, for example.

  The AC / DC converter 230 is connected to the commercial power source 70, converts an AC power source into a DC power source, and supplies it to the dimming circuit 240 and the LED 250.

  The dimming circuit 240 turns on / off the power supply to the LED 250 based on the PWM signal input from the control circuit 210.

  The LED 250 is an example of an illumination light source, and is controlled by the control circuit 210 and the dimming circuit 240 to emit light at the dimming degree input to the lighting device 20. The illumination light source is not limited to the LED as long as the light can be adjusted.

(Projector)
Next, the configuration of the projection device 30 will be described. FIG. 3 is a diagram illustrating a configuration of the projection apparatus 30 according to the embodiment.

  As shown in FIG. 3, the projection device 30 includes a power switch 310, a power circuit 312, an operation panel 314, a communication I / F 316, a control device 320, a fan drive circuit 330, a fan 331, an LED control circuit 340, an LED 341, an image. A processing circuit 350, a projection device 351, a projection lens 360, and a camera 370 are included.

  The power switch 310 is used for ON / OFF operation of the projection apparatus 30. When the power switch 310 is turned on, power supply from the power supply circuit 312 to each unit is started, and an ON signal is input to the control device 320. When the power switch 310 is turned off, power supply from the power supply circuit 312 to each unit is stopped, and an OFF signal is input to the control device 320.

  The power supply circuit 312 is connected to, for example, a commercial power supply 70, and starts or stops supplying power to each unit in response to an ON / OFF operation of the power switch 310.

  The operation panel 314 is an example of an operation unit, and is hardware including, for example, a plurality of buttons, a liquid crystal panel, and the like, and receives an input operation from a user.

  The control device 320 is an example of a control unit, and includes a CPU 321, a ROM 322, and a RAM 323. In the control device 320, for example, the CPU 321 and the RAM 323 cooperate to execute a program stored in the ROM 322, thereby controlling the operation of each unit of the projection device 30.

  The fan drive circuit 330 is controlled by the control device 320 to drive the fan 331. The fan 331 is controlled by the control device 320 via the fan drive circuit 330, and cools by sending cooling air to the LED 341, the projection lens 360, and the like.

  The LED control circuit 340 is controlled by the control device 320 to cause the LED 341 to emit light. The LED 341 is an example of a projection light source, and the light amount and the like are controlled by the control device 320 via the LED control circuit 340. The projection light source is not limited to the LED, and may be a fluorescent lamp, for example.

  The image processing circuit 350 generates a projection image signal based on image data transmitted from, for example, a PC connected to the communication I / F. The projection device 351 includes, for example, a liquid crystal panel, a DMD (digital mirror device), and the like, and generates a projection image by modulating light emitted from the LED 341 based on a projection image signal input from the image processing circuit 350. .

  The projection lens 360 includes, for example, a plurality of lenses, and enlarges and projects the projection image generated by the projection device 351 onto the screen 40 or the like. The projection device 351 and the projection lens 360 are an example of a projection unit.

  The camera 370 is an example of an imaging unit, and is a digital camera that captures an area including at least a part of a projection image projected from the projection lens 360 onto the screen 40 or the like. In the present embodiment, the camera 370 is built in the projection device 30, but may be configured to be provided outside the projection device 30 and connected to the communication I / F 316.

(Projection processing)
Next, a projection process in the projection system 1 will be described.

  In the projection system 1, at the start of projection of an image in the projection device 30, a projection process for adjusting the dimming degree of the illumination device 20 and the light amount of the LED 341 of the projection device 30 is executed.

  FIG. 4 is a diagram illustrating a flowchart of the projection processing in the embodiment. In the projection processing, first, the projection device 30 projects an image on the screen 40 in step S101. The image projected in step S101 is, for example, an entirely white test pattern. Further, the image projected in step S101 may be, for example, a presentation material sample composed of characters, photographs, and the like, various moving image samples, and the like.

  Next, in step S102, the camera 370 captures an image including at least a part of the projection image 41 projected from the projection lens 360. As shown in FIG. 5A, the camera 370 may capture an area 80 that includes the entire projection image 41 projected on the screen 40. As shown in FIG. A region 80 including a part of 41 may be imaged.

In step S103, the control unit 320 obtains a luminance L ₁ of the projected image area is an area of the projected image 41 in the image captured by the camera 370, and a brightness L ₂ of the projection image outside area except for the projected image 41, the brightness The difference L ₁₂ (L ₁ −L ₂ ) is calculated. The control device 320 obtains the maximum luminance or the average luminance in each area as the luminance L ₁ and L ₂ of each area and calculates the luminance difference L ₁₂ .

In step S104, the control unit 320, a luminance difference _{L 12} calculated in step S103, it is compared with the threshold value _{V 1} which is set in advance.

If the luminance difference _{L 12} is the threshold value _{V 1} below: (Step S104 NO), the higher the luminance _{L 2} of the projection image outside region with respect to the luminance _{L 1} of the projected image area, the projected image 41 for the luminance difference is small, It may be difficult to see. Moreover, the dimming degree of the illuminating device 20 is high, and electric power may be consumed more than necessary.

Therefore, in this case, at step S105, the control unit 320, together with the luminance L ₂ is reduced in the projected image area outside, so the power consumption in the lighting device 20 is reduced, the light control device 50 The light control degree of the illuminating device 20 is lowered. Thereafter, the processing from step S102 is executed again. Note that the control device 320 may directly transmit the dimming degree to the lighting device 20 without using the dimming control device 50.

If the luminance difference _{L 12} in the captured image is the threshold _{V 1} or more: (step S104 YES), at step S106, the control unit 320, a luminance difference _{L 12} calculated in step S103, are set in advance It is compared with the threshold _{V 2.}

If the luminance difference _{L 12} in the captured image is the threshold _{V 2} or more: (step S106 NO), the higher the luminance _{L 1} of the projected image area with respect to the luminance _{L 2} of the projection image area outside, it is large brightness difference projection Viewing the image 41 may increase the degree of eye fatigue experienced. Moreover, the light quantity of LED341 which is a projection light source of the projection apparatus 30 is large, and electric power may be consumed more than necessary.

Therefore, in this case, at step S107, the control unit 320, together with the luminance _{L 1} is reduced in the projected image area, so power consumption in the projection device 30 is reduced, the amount of a projection light source LED341 Lower. Thereafter, the processing from step S102 is executed again.

If the luminance difference _{L 12} in the captured image is less than the threshold _{V 2:} (step S106 YES) is seated within a set range _{V 12} in which the luminance difference _{L 12} is determined by the threshold _V 1, _{V 2,} the projected image 41 Is displayed with brightness that makes it easy to see and does not fatigue the eyes. Further, in the projection system 1 including the illumination device 20 and the projection device 30, the power consumption is optimized without consuming more power than necessary. Therefore, in this case, the projection process is ended, and the projection apparatus 30 receives an input of image data from a connected PC or the like and starts projection onto the screen 40 or the like.

By the projection processing described above, such that the luminance difference L ₁₂ of the projection image area and the projection image outside area is within the range V ₁₂ that is set in the captured image, the dimming and the projection device 30 of the lighting device 20 LED341 The amount of light is automatically controlled. By such processing, the projection image is displayed with brightness that is easy to see and does not cause eyestrain by the projection device 30, and power consumption in the projection system 1 is reduced.

  Note that before step S101 in the above-described projection processing, the control device 320 of the projection device 30 may set the dimming degree of the illumination device 20 to a predetermined value. FIG. 6 is a diagram illustrating a flowchart of the projection process to which a step of setting the dimming degree of the illumination device 20 at the start of the process is added.

  As shown in FIG. 6, before the projection device 30 projects an image such as a test pattern in step S202, the control device 320 of the projection device 30 causes the interior of the room 10 to have an appropriate brightness in step S201. As such, the dimming degree of the lighting device 20 is set to a predetermined value. The processing from step S202 to step S208 is the same as the processing from step S101 to step S107 described above.

  As described above, by setting the dimming degree of the lighting device 20 to a predetermined value at the start of the projection processing, both the dimming degree of the lighting device 20 and the light amount of the LED 341 of the projection device 30 are set to high values. It is no longer controlled, and it is possible to suppress power consumption more than necessary.

In the above-described projection processing, the control device 320 calculates the luminance ratio L ₁₂ (L ₁ / L ₂ ) between the luminance L ₁ of the projected image area and the luminance L _{2 of the} outer area of the projected image, and the set range V ₁₂ . You may control the light control degree of the illuminating device 20, and the light quantity of LED341 of the projection apparatus 30 based on a comparison result. In this case, the threshold values V ₁ and V ₂ are set to values different from the case where the luminance difference L ₁₂ is used, but the flow of the projection process is the same.

  When a plurality of lighting devices 20 are provided in the room 10, the control device 320 of the projection device 30 may set different dimming degrees for each of the plurality of lighting devices 20. In this way, by setting different dimming levels for the plurality of lighting devices 20, it becomes possible to create an environment in which the projected image is easier to see.

  Further, the above-described projection processing may be executed before the projection apparatus 30 starts projecting image data input from a PC or the like. For example, the projection processing may be executed at a predetermined cycle during the projection of image data. It may be executed every time it is switched.

Some image data input to the projection device 30 may luminance L ₁ of the projected image area can change during projection. However, and perform projection processing described above in the projection periodically, by executing every time the image data is switched, even if the luminance L ₁ of the projected image area varies, always displays clarity of the projected image 41, It becomes possible to further reduce power consumption.

Further, the threshold values V ₁ and V ₂ used in the projection processing may be changeable to arbitrary values input by the user using the operation panel 314 of the projection device 30. The user can obtain a desired projection environment without operating the dimming degree of the illumination device 20 or the light amount of the LED 341 of the projection device 30 by himself / herself.

  Up to this point, the present invention has been described based on the above-described embodiment, but the function of the projection system 1 is that each processing procedure in the projection processing is coded as a program in the programming language suitable for the projection system 1. It can be realized by a computer.

  A program for realizing the projection system 1 according to the above-described embodiment can be stored in a computer-readable recording medium. Therefore, the program according to the above-described embodiment is stored in a recording medium such as a floppy (registered trademark) disk, a CD (Compact Disc), a DVD (Digital Versatile Disk), and the like. It can be installed in the projection device 30. In the projection system 1, the program according to the above embodiment may be downloaded from the network 60 and installed in the projection apparatus 30.

  As described above, according to the projection system 1 according to the above-described embodiment, the dimming degree of the illumination device 20 and the light amount of the LED 341 of the projection device 30 are automatically controlled, and the projection image 41 is displayed in an easily viewable manner. At the same time, unnecessary power consumption in the projection environment is suppressed.

  Although the projection system, the projection apparatus, and the projection method according to the embodiments have been described above, the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the scope of the present invention.

1 Projection System 20 Illumination Device 30 Projection Device 250 LED (Illumination Light Source)
314 Operation panel (operation means)
320 Control device (control means)
341 LED (projection light source)
351 Projection device (projection means)
360 Projection lens (projection means)
370 Camera (imaging means)

JP 2008-277092 A

Claims (6)

A projection system comprising an illumination device having a dimmable illumination light source and a projection device for projecting an image,
Projection means for projecting an image with light emitted from a projection light source;
Imaging means for imaging a region including at least a part of a projection image projected by the projection means;
Control means for controlling the dimming degree of the illumination light source or the light amount of the projection light source based on a luminance difference between a projected image area and a non-projected image area in a captured image captured by the imaging means. A projection system characterized by that. The control means reduces the dimming degree of the illumination light source when the luminance difference is not more than a set range, and reduces the light amount of the projection light source when the luminance difference is not less than the set range. The projection system according to claim 1. The projection system according to claim 2, wherein the projection apparatus includes an operation unit that receives an input operation of the setting range. 4. The projection system according to claim 1, wherein the control unit sets a dimming degree of the illumination light source to a predetermined value before starting projection of an image by the projection unit. 5. A projection device connected to an illumination device having a dimmable illumination light source,
Projection means for projecting an image with light emitted from a projection light source;
Imaging means for imaging a region including at least a part of a projection image projected by the projection device;
Control means for controlling the dimming degree of the illumination light source or the light amount of the projection light source based on a luminance difference between a projected image area and a non-projected image area in a captured image captured by the imaging means. A projection apparatus characterized by that. A projection method in a projection system having an illumination device having a dimmable illumination light source and a projection device for projecting an image,
A projection step of projecting an image with light emitted from a projection light source;
An imaging step of imaging an area including at least a part of a projection image projected by the projection step;
And a control step of controlling the dimming degree of the illumination light source or the light amount of the projection light source based on the luminance difference between the projected image area and the outside of the projected image in the captured image captured by the imaging step. A projection method characterized by that.

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