JP2016061983A - Projection system, projection system control method, and projection system control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection system that is broad in an observable range (field-of-view angle characteristic) and is small in energy consumption.SOLUTION: A projection system 1 comprises: a screen to which projection light is projected; and a first projector 210 and second projector 220 that are provided so as to project an image to the screen from a mutually different direction. In the projection system 1, a human sensing sensor 140 is provided that acquires a position of an observer. An output determination unit 114 provided in a control unit 110 is configured to determine an output of two projectors in accordance with the position of the observer acquired by the human sensing sensor 140, and a projection control unit 116 provided in the control unit 110 is configured to control an operation of two projectors on the basis of the output.SELECTED DRAWING: Figure 2

Description

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

  In recent years, various electronic signboards (digital signage) have become widespread. As one of such electronic signboards, a signage mannequin that displays images by irradiating a projector with projection light is known. Some signage mannequins using a projector use a transmission diffusion type screen as a screen and project an image from the back. In such a signage mannequin system, in order to reduce the required space on the back of the screen, an ultra-short focus optical system is used for the projector, and an image is projected from the back side of the screen.

  Despite being irradiated from the back side, a Fresnel lens may be used for the screen in order to improve the visibility of the image from the front of the screen. However, in such a configuration, a range (viewing angle characteristic) in which an image can be appropriately observed may be narrowed. On the other hand, a technique (stack projection technique) is known in which an image is irradiated onto a screen from a plurality of directions so that the image becomes bright. For example, Patent Document 1 discloses a technique for projecting the same image from a plurality of directions and superimposing these projected images. Generally, when a plurality of projectors are used, the energy consumption of the entire system increases.

JP 2004-336225 A

  An object of the present invention is to provide a projection system having a wide observable range (viewing angle characteristic) and low energy consumption.

  A projection device according to one embodiment of the present invention acquires a screen on which projection light is projected, at least two projection devices provided to project an image onto the screen from different directions, and an observer's observation position. An acquisition unit; an output determination unit that determines outputs of the at least two projection devices according to the observation position; and a projection control unit that controls operations of the at least two projection devices based on the outputs. .

  According to the projection system control method of one aspect of the present invention, the image is projected from at least two directions different from each other using at least two projection devices provided to project an image onto a screen on which projection light is projected. Obtaining an observation position of an observer; determining outputs of the at least two projection devices according to the observation position; and operating the at least two projection devices based on the outputs Controlling.

  The program for controlling the projection system according to one aspect of the present invention uses at least two projection devices provided to project an image on a screen on which projection light is projected, and the program from at least two directions different from each other. Projecting an image, obtaining an observation position of an observer, determining outputs of the at least two projection devices according to the observation position, and based on the outputs, the at least two projections Controlling the operation of the device.

  According to the present invention, it is possible to provide a projection system having a wide observable range (viewing angle characteristic) and low energy consumption.

1 is a diagram showing an outline of a configuration example of a projection system according to a first embodiment. The block diagram which shows the outline of the structural example of the projection system which concerns on each embodiment. FIG. 2 is a block diagram showing an outline of a configuration example of a projector according to each embodiment. The figure for demonstrating the positional relationship between the 1st projector which concerns on 1st Embodiment, a 2nd projector, and a screen, and an observable area | region. 5 is a flowchart illustrating an example of an operation according to the first embodiment. The figure for demonstrating the operation | movement which concerns on 1st Embodiment. The figure which shows the outline of the structural example of the projection system which concerns on a comparative example. The figure for demonstrating the positional relationship of the projector and screen which concern on a comparative example, and an observable area | region. The figure which shows an example of the relationship between the observer's position which concerns on 2nd Embodiment, and the brightness | luminance of a 1st projector and a 2nd projector. The flowchart which shows an example of the operation | movement which concerns on 2nd Embodiment. The figure which shows the outline of the structural example of the projection system which concerns on 3rd Embodiment. The figure for demonstrating the positional relationship and the observable area | region of the 1st projector which concerns on 3rd Embodiment, a 2nd projector, and a screen. The figure for demonstrating the positional relationship of the 1st projector which concerns on 4th Embodiment, a 2nd projector, and a screen, and an observable area | region.

[First Embodiment]
An embodiment of the present invention will be described with reference to the drawings. An outline of the configuration of the projection system according to this embodiment is shown in FIG. A projection system 1 shown in FIG. 1 functions as a signage mannequin using a projector having an ultrashort focus projection lens. The projection system 1 according to this embodiment includes a control device 100, a screen 260, and a first projector 210 and a second projector 220 that project an image onto the screen 260.

  The screen 260 is a transmissive screen provided with a diffusion plate, and incident light is transmitted through the screen 260 while being diffused by the diffusion plate. In the projection system 1 according to the present embodiment, the first projector 210 and the second projector 220 are arranged on the opposite side of the observer with the screen 260 interposed therebetween, and the observer observes the projection light transmitted through the screen 260. . That is, an image is projected onto the screen 260 from the back by the first projector 210 and the second projector 220.

  Hereinafter, for the sake of explanation, the side on which the viewer observes the image with respect to the screen 260 is referred to as the front, and the side on which the first projector 210 and the second projector 220 are disposed is referred to as the rear. Further, the left direction is defined as the left direction and the right direction is defined as the right direction from the front side toward the rear side. (The left-right relationship from the first projector 210 and the second projector 220 is reversed.)

  In the projection system 1, the first projector 210 is installed on the left rear side of the screen 260. The second projector 220 is installed on the right rear side of the screen 260. The first projector 210 and the second projector 220 are arranged symmetrically with respect to the screen 260. Thus, the first projector 210 and the second projector 220 are arranged at different positions in the horizontal direction, and the traveling directions of the projection light emitted from the respective projectors are different from each other in the horizontal direction.

  The control device 100 is a device that controls the operations of the first projector 210 and the second projector 220. For example, the control device 100 is disposed in a housing provided at the lower portion of the screen 260. The control device 100 is a device that performs control related to the projection of the projection system 1.

  A block diagram showing an outline of the configuration of the projection system 1 is shown in FIG. The control device 100 includes a control unit 110, a human sensor 140, a recording unit 150, and an input unit 160.

  A human sensor 140 as an acquisition unit that acquires an observation position by an observer is provided, for example, in front of the control device 100. The human sensor 140 detects the horizontal position of the observer represented by the direction and distance of the observer with respect to the human sensor 140. As the human sensor 140, for example, a pyroelectric sensor is used. The pyroelectric sensor detects a temperature change in the sensing area using infrared rays when an object having a temperature difference with respect to the ambient temperature moves within the sensing area. In the present embodiment, for example, the position of the observer is detected by combining a plurality of pyroelectric sensors having directivity.

  An ultrasonic sensor may be used as the human sensor 140. The ultrasonic sensor transmits ultrasonic waves from the transmitter, receives the reflected waves reflected by the observer by the receiver, and determines the distance to the observer based on the time and sound speed required from transmission to reception. Calculate. By controlling the direction of the transmitted ultrasonic wave, the position of the observer can be detected.

  The recording unit 150 records data related to video projected on the screen 260, data related to audio output from the first projector 210 and the second projector 220, and the like. The recording unit 150 stores a program for the operation of the control device 100 and other necessary information.

  The input unit 160 is a part where a user instruction is input. The input unit 160 includes a general input device such as a button or a touch panel.

  The control unit 110 is a part that exhibits a function of controlling operations of the first projector 210 and the second projector 220. The control unit 110 includes a central processing unit (CPU) or an application specific integrated circuit (ASIC) and performs various calculations. The operation of the control unit is performed according to a program recorded in the recording unit 150. Further, the control unit 110 controls each unit of the control device 100.

  The control unit 110 includes an evaluation value calculation unit 112, an output determination unit 114, and a projection control unit 116. Based on the output of the human sensor 140, the evaluation value calculation unit 112 determines an evaluation value representing information related to the position of the observer. The output determination unit 114 determines values related to the outputs of the first projector 210 and the second projector 220. Projection control unit 116 controls the operations of first projector 210 and second projector 220 in accordance with the output determined by output determination unit 114.

  The first projector 210 and the second projector 220 as the projection apparatus according to the present embodiment will be described. Here, the configuration of the first projector 210 and the configuration of the second projector 220 are the same. Hereinafter, unless otherwise noted, the first projector 210 and the second projector 220 are referred to as projectors without distinction. The projector uses a Digital Light Processing (DLP) (registered trademark) system using a micromirror display element. An outline of the configuration of the projector is shown in FIG. The projector includes an input / output connector unit 11, an input / output interface (I / F) 12, an image conversion unit 13, a projection processing unit 14, a micromirror element 15, a light source unit 16, a mirror 18, and a projection. The lens 20 includes a CPU 25, a main memory 26, a program memory 27, an operation unit 28, an audio processing unit 30, a speaker 32, and a system bus SB.

  The input / output connector unit 11 is provided with terminals such as a pin jack (RCA) type video input terminal and a D-sub 15 type RGB input terminal, for example, and an analog image signal is input thereto. The input image signal is transmitted to the image conversion unit 13 via the input / output I / F 12 and the system bus SB. The analog image signals of various standards input to the input / output connector unit 11 are converted into digital image signals at the input / output I / F 12. The input / output connector unit 11 may be provided with, for example, an HDMI (registered trademark) terminal and the like so that not only an analog image signal but also a digital image signal can be input. The input / output connector unit 11 receives an audio signal that is an analog signal or a digital signal. The input audio signal is transmitted to the audio processing unit 30 via the input / output I / F 12 and the system bus SB. In the present embodiment, the control unit 110 of the control device 100 is connected to the input / output connector unit 11. Image and audio data is input from the control unit 110 to the input / output connector unit 11. Further, a control signal for controlling the operation of the projector is input from the control unit 110 to the input / output connector unit 11. This control signal is transmitted to the CPU 25. Based on this control signal, the operation of the projector is controlled.

  The image conversion unit 13 is also referred to as a scaler. The image conversion unit 13 performs conversion for adjusting the number of resolutions, the number of gradations, and the like for the input image data, and generates image data in a predetermined format suitable for projection. The image conversion unit 13 transmits the converted image data such as image correction to the projection processing unit 14. If necessary, the image conversion unit 13 transmits image data on which symbols for On Screen Display (OSD) indicating various operation states of the projector are superimposed to the projection processing unit 14 as processed image data.

  The light source unit 16 emits light of a plurality of colors including primary color lights of red (R), green (G), and blue (B). Here, the light source unit 16 is configured to sequentially emit a plurality of colors in a time division manner. The light emitted from the light source unit 16 is totally reflected by the mirror 18 and enters the micromirror element 15.

  The micromirror element 15 has a plurality of micromirrors arranged in an array. Each micromirror is turned on / off at high speed to reflect light emitted from the light source unit 16 toward the projection lens 20 or to deflect it from the direction of the projection lens 20. In the micromirror element 15, micromirrors are arranged, for example, for WXGA (Wide eXtended Graphic Array) (horizontal 1280 pixels × vertical 800 pixels). The micromirror element 15 forms an image with WXGA resolution, for example, by reflection at each micromirror. Thus, the micromirror element 15 functions as a spatial light modulation element.

  The projection processing unit 14 drives the micromirror element 15 in order to display the image represented by the image data in accordance with the image data transmitted from the image conversion unit 13. That is, the projection processing unit 14 turns on / off each micromirror of the micromirror element 15. Here, the projection processing unit 14 drives the micromirror element 15 in a time-sharing manner at a high speed. The number of divisions per unit time includes a frame rate according to a predetermined format, for example, 60 [frames / second], a division number of color components, for example, 3 [colors], and a display gradation number, for example, 256 [gradation]. The number obtained by multiplying by. Further, the projection processing unit 14 controls the operation of the light source unit 16 in synchronization with the operation of the micromirror element 15. That is, the projection processing unit 14 controls the operation of the light source unit 16 so as to time-divide each frame and sequentially emit light of all color components for each frame.

  The projection lens 20 adjusts the light guided from the micromirror element 15 to light projected on the screen 260. Therefore, the optical image formed by the reflected light from the micromirror element 15 is projected and displayed on the screen 260 via the projection lens 20. The projection lens 20 has a zoom mechanism and has a function of changing the size of the projected image. Further, the projection lens 20 has a focus adjustment mechanism for adjusting the in-focus state of the projection image. Thus, the light source unit 16 and the projection lens 20 function as a projection optical system configured to project projection light onto the projection target.

  The sound processing unit 30 includes a sound source circuit such as a PCM sound source. Based on analog audio data input from the input / output connector unit 11 or based on a signal obtained by analogizing digital audio data given at the time of projection operation, the audio processing unit 30 drives the speaker 32 to produce a loud sound emission. Let In addition, the sound processing unit 30 generates a beep sound or the like as necessary. The speaker 32 is a general speaker that emits sound based on a signal input from the sound processing unit 30.

  The CPU 25 controls operations of the image conversion unit 13, the projection processing unit 14, and the sound processing unit 30. The CPU 25 is connected to the main memory 26 and the program memory 27. The main memory 26 is composed of, for example, an SRAM. The main memory 26 functions as a work memory for the CPU 25. The program memory 27 is composed of an electrically rewritable nonvolatile memory. The program memory 27 stores an operation program executed by the CPU 25, various fixed data, and the like. The CPU 25 is connected to the operation unit 28. The operation unit 28 includes a key operation unit provided in the main body of the projector and an infrared light receiving unit that receives infrared light from a remote controller (not shown) dedicated to the projector. The operation unit 28 outputs to the CPU 25 a key operation signal based on a key operated by a user using a key operation unit of the main body or a remote controller. The CPU 25 uses the programs and data stored in the main memory 26 and the program memory 27 to control the operation of each unit of the projector in accordance with a user instruction from the operation unit 28. In the present embodiment, the operation unit 28 includes, for example, a cross key and an OK button.

  The projection operation of the projector will be described. This projection operation is executed by the projection processing unit 14 under the control of the CPU 25. The operation of the light source unit 16 is controlled by the projection processing unit 14. The projection processing unit 14 changes the on / off state of the semiconductor lasers and LEDs that emit the respective colors in the light source unit 16, the combination of the light source and the phosphor, and the like, for example, red light (R), green light (G ) And three colors of blue light (B) are sequentially emitted from the light source unit 16. The projection processing unit 14 causes red light, green light, and blue light to sequentially enter the micromirror element 15 from the light source unit 16.

  The micromirror element 15 increases the time for guiding the incident light to the projection lens 20 as the gradation based on the image data is higher for each minute mirror (each pixel) for each color of light, and the incident light as the gradation is lower. Is reduced to the projection lens 20. That is, the projection processing unit 14 makes the micromirror so that the micromirror corresponding to the pixel with low gradation is turned on for a long time so that the micromirror corresponding to the pixel with high gradation is turned on for a long time. The element 15 is controlled. By doing in this way, the gradation of each color can be expressed for each minute mirror (each pixel) for the light emitted from the projection lens 20.

  For each frame, a color image is expressed by combining the gradation expressed by the time when the micromirror is on for each color. As described above, projection light expressing an image is emitted from the projection lens 20. By projecting the projection light onto the screen 260, a color image is displayed on the screen 260.

  In the above description, an example of a projector that uses three colors of red light, green light, and blue light has been described. However, these colors may be used to form an image by combining complementary colors such as magenta and yellow, white light, and the like. The projector may be configured so as to be able to emit the light. Although a DLP (registered trademark) projector has been described here as an example, any projector may be used. For example, a projector using liquid crystal may be used.

  Here, the positional relationship between the first projector 210, the second projector 220, and the screen 260 and the observable area according to the present embodiment will be described with reference to FIG. The optical path of the projection light emitted from the first projector 210 disposed on the rear left side of the screen 260 is indicated by a solid line arrow in FIG. That is, an image projected on the screen 260 by the first projector 210 is easily visually recognized in a region sandwiched between two solid arrows in front of the screen 260. As described above, an observer in the range from the front center to the front right side can easily view the image projected by the first projector 210.

  Further, the optical path of the projection light emitted from the second projector 220 disposed on the right rear side of the screen 260 is indicated by a broken line arrow in FIG. That is, an image projected on the screen 260 by the second projector 220 is easily visually recognized in a region sandwiched between two dashed arrows in front of the screen 260. In this way, an observer in the range from the front center to the left front side can easily view the image projected by the second projector 220.

  The observer in the front center can easily view both the image projected by the first projector 210 and the image projected by the second projector 220. For this reason, in this embodiment, the image projected onto the screen 260 by the first projector 210 and the image projected onto the screen 260 by the second projector 220 are projected so as to exactly overlap on the screen 260. .

  The operation of the projection system 1 according to this embodiment will be described. For example, when the user inputs an instruction to start projecting content on the screen 260 to the input unit 160, the projection operation starts according to the instruction. The control unit 110 of the control device 100 outputs the data related to the content recorded in the recording unit 150, that is, the data related to the image projected on the screen 260, and the first projector 210 and the second projector 220. Audio data is read from the recording unit 150. Control unit 110 outputs the read image data and audio data to first projector 210 and second projector 220.

  The first projector 210 and the second projector 220 that have acquired the image data and the sound data from the control unit 110 project an image based on the image data onto the screen 260 and output the sound based on the sound data from the speaker 32. To do. As a result, the observer can view the image projected on the screen 260 from the front side of the screen 260, and can hear the sound output from the first projector 210 and the second projector 220. .

  The content reproduced in this way is, for example, as follows. The projection system 1 is installed in a store, for example, and is used for sales area guidance of the store or introduction of bargains. As shown in FIG. 1, a person is displayed on the screen 260. As for the person displayed on the screen 260, facial expressions such as mouth and eyes move, and hands move. The sound is reproduced in accordance with the movement of the person. In this way, the store customers who pass the front side of the screen 260 are presented with information on sales floors, introduction of bargains, and the like.

  The projection system 1 according to the present embodiment is provided with an operation in an energy saving mode for detecting the position where the observer is present and stopping unnecessary output of the projector. This energy saving mode may always be applied, or may be selectively applied by the user.

  The operation of the control device 100 in the energy saving mode will be described with reference to the flowchart shown in FIG.

  In step S101, the control unit 110 performs initial setting of the first flag F1 and the second flag F2 that can take a value of 0 or 1. Here, the first flag F <b> 1 is a flag for the first projector 210. When the first flag F1 is 1, the operation of the first projector 210 is turned on, and an image is projected by the first projector 210. On the other hand, when the first flag F1 is 0, the operation of the first projector 210 is turned off, and the first projector 210 does not project an image. Similarly, the second flag F2 is a flag for the second projector 220. When the second flag F2 is 1, the operation of the second projector 220 is turned on, and an image is projected by the second projector 220. On the other hand, when the second flag F2 is 0, the operation of the second projector 220 is turned off, and no image is projected by the second projector 220. In step S101, the control unit sets the first flag F1 and the second flag F2 to 0. The setting of the first flag F1 and the second flag F2 according to the present embodiment is performed by the evaluation value calculation unit 112.

  In step S <b> 102, the control unit 110 acquires information related to the position of the observer around the screen 260 from the human sensor 140.

  In step S <b> 103, the output determination unit 114 of the control unit 110 determines whether an observer is detected near the center of the screen 260 or on the right side. If it is not determined that an observer has been detected near the center or on the right side of the screen 260, the process proceeds to step S105. On the other hand, when it is determined that an observer is detected near the center of the screen 260 or on the right side, the process proceeds to step S104. In step S104, the control unit 110 sets the first flag F1 for the first projector 210 to 1. Thereafter, the process proceeds to step S105.

  In step S <b> 105, the output determination unit 114 of the control unit 110 determines whether an observer is detected near the center of the screen 260 or on the left side. If it is not determined that an observer has been detected near the center or the left side of the screen 260, the process proceeds to step S107. On the other hand, when it is determined that an observer is detected near the center or on the left side of the screen 260, the process proceeds to step S106. In step S106, the control unit 110 sets a second flag F2 for the second projector 220 to 1. Thereafter, the process proceeds to step S107.

  In step S <b> 107, the projection control unit 116 of the control unit 110 controls the projection operation by the first projector 210 and the second projector 220. That is, when the first flag F1 is 1, the control unit 110 causes the first projector 210 to project an image. At this time, the image data is transmitted from the control unit 110 to the first projector 210. The first projector 210 turns on the light source unit 16 and operates the micromirror element 15 and the like to project an image based on the image data. On the other hand, when the first flag F1 is 0, the control unit 110 does not cause the first projector 210 to project an image. At this time, the control unit 110 does not send image data to the first projector 210 and transmits a control signal for turning off the light source unit 16 and not operating the micromirror element 15 and the like. The first projector 210 saves energy by turning off the light source unit 16 in accordance with a command from the control unit 110. Similarly, when the second flag F2 is 1, the control unit 110 causes the second projector 220 to perform projection. Further, when the second flag F2 is 0, the control unit 110 does not cause the second projector 220 to perform projection.

  Although not clearly described in the above flow, if no observer is detected in the vicinity of the screen 260 from the human sensor 140 in step S102, the first flag F1 and the second flag F2 are set. Since both remain 0, the control unit 110 causes neither the first projector 210 nor the second projector 220 to perform projection. Thereby, energy saving can be achieved even when an observer is not detected.

  Note that the reproduced sound may be output from the first projector 210 and the second projector 220 regardless of the first flag F1 and the second flag F2. In this way, audio can always be output in stereo. Note that the audio output consumes less power than image projection. Further, for energy saving, sound may be output only from a projector that performs image projection. Further, when the first flag F1 is 1, it may be output from the second projector 220, and when the second flag F2 is 1, it may be output from the first projector 210. In this way, sound is output from the speaker closer to the observer. Further, the speaker does not need to be provided in the projector, and is provided, for example, below the screen 260, and sound may always be output from this speaker.

  In step S108, the control unit 110 determines whether or not to end the operation. When it is determined to end the operation, the process ends. On the other hand, when it is determined not to end the operation, the process returns to step S101. That is, the position of the observer is detected again, and the operations of the first projector 210 and the second projector 220 are controlled based on the detection result. Thus, in this embodiment, since the position of an observer is repeatedly acquired, even if the observer moves, the observer follows.

  The operation of the projection system 1 according to this embodiment will be described with reference to FIG. FIG. 6 shows the relationship between the direction of the projection light projected from the projector and the position of the observer. When the viewer 910 is on the right side as viewed from the front of the screen 260 from the front, the first flag F1 is set to 1 in step S104. As a result, the projection by the first projector 210 is performed in step S107. Since the projection light emitted from the first projector 210 travels from the center to the right side, the viewer 910 on the right side can easily view the image projected on the screen 260. On the other hand, since the projection light emitted from the second projector 220 travels from the center to the left side, it is difficult for the viewer 910 on the right side to visually recognize the image projected on the screen 260 by the second projector 220. become. For this reason, for the observer 910 on the right side, the projection light emitted from the second projector 220 is not used as effectively as the projection light from the first projector 210. On the other hand, since the projection light emitted from the second projector 220 travels from the center to the left side, the observer 920 at the center and the observer 930 at the left are projected onto the screen 260 by the second projector 220. It is easy to visually recognize the image. In the present embodiment, when there is no observer at the center or the left side, the second flag F2 is not set to 1, projection by the second projector 220 is not performed, and energy saving is achieved.

  As described above, in the projection system 1 according to the present embodiment, the images are projected from both the left and right sides of the screen 260, so that the screen projected on the screen 260 is easily visible to the viewer in front of the screen 260. The viewing angle for 260 is wide. That is, even if the screen 260 is observed from a steep angle, the image projected on the screen 260 is easily visible. Such an effect that the observable range (viewing angle characteristic) is widened is particularly great in a system that performs rear projection in which an image is projected from behind the screen 260 as in the present embodiment.

  Moreover, in this projection system 1, according to the direction in which the observer is detected by the human sensor 140, projection is performed from the direction so that the projected image can be easily observed, and from the direction in which the observer is not detected. Is controlled so that the projection image is not projected. Therefore, extra energy consumption due to unnecessary projection can be suppressed. In addition, since the detection result of the observer by the human sensor 140 is appropriately updated, the observer is followed. This leads to both observation by the observer and energy saving.

  In the present embodiment, the number of projectors has been described as two, but the present invention is not limited to this. For example, the number of projectors may be more than two.

  In the present embodiment, the image projected by the first projector 210 and the image projected by the second projector 220 have been described as being the same. However, it is not limited to this. For example, the image emitted from the first projector 210 observed by the observer on the right side is an image of a person facing the observer on the right side, and the second observed by the observer on the left side. The image projected from the projector 220 is different from the images projected from the left and right projectors, such as an image of a person facing the viewer on the left side. It may be configured such that the projection is performed. With such a configuration, the advertising effect can be further improved.

  In the present embodiment, only the orientation of the person's image is changed, but a configuration in which a completely different image is switched may be used. For example, if the image is switched to an image related to a product around (displayed) around the screen in the viewing direction of the observer, the advertising effect can be improved according to the position of the observer.

[Comparative example]
For comparison with the projection system 1 according to the present embodiment, a projection system according to a comparative example in which the number of projectors is one and a Fresnel lens is used for the screen will be described. FIG. 7 is a schematic diagram of the projection system. FIG. 8 is a diagram for explaining the positional relationship between the projector and the screen and the observable area according to the comparative example.

  This projection system includes a third projector 212 and a screen 262 with a Fresnel lens. The third projector 212 is disposed on the left side behind the screen 262 with a Fresnel lens. The configuration of the third projector 212 is the same as that of the first projector 210.

  The Fresnel lens-equipped screen 262 is superposed on the back surface of the transmission screen 264 with the Fresnel lens 265 adhered or mechanically held. The traveling direction of the projection light emitted from the third projector 212 incident from the rear left side of the screen 262 with Fresnel lens is changed by the Fresnel lens 265 toward the front center of the screen 262 with Fresnel lens.

  In the projection system according to this comparative example, a field of view from the front direction of the screen 262 with the Fresnel lens is secured by the Fresnel lens 265. However, since only one projector is used, the visibility when the screen 262 with the Fresnel lens is viewed obliquely is worse than that of the projection system 1 according to the first embodiment described above. In addition, since the expensive Fresnel lens 265 is used in the projection system according to the comparative example, the cost of the projection system is relatively expensive. On the other hand, according to the projection system 1 according to the first embodiment, it is possible to realize a system that has a wide observable range and is reduced in cost because the Fresnel lens is not used for the screen. Further, in the projection system 1 according to the first embodiment, unnecessary projector operations are restricted, so that power consumption can be suppressed.

[Second Embodiment]
A second embodiment will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. In the projection system according to the present embodiment, the evaluation value calculation unit 112 calculates the evaluation value of the observer's position based on the output of the human sensor 140, and the projection control unit 116 uses the projector based on the evaluation value. Control projection. More specifically, the luminance of light emitted from the light source unit 16 of the first projector 210 and the luminance of light emitted from the light source unit 16 of the second projector 220 are adjusted based on the evaluation value. .

  FIG. 9 is a diagram illustrating an example of the relationship between the evaluation value of the observer position according to the present embodiment and the luminance of the first projector 210 and the luminance of the second projector 220. Here, the evaluation value of the position of the observer represents, for example, the position when there is a single observer detected by the human sensor 140, and represents the center of gravity of those positions when there are a plurality of observers detected. Value. The evaluation value is not limited to the center of gravity, and may be another value. When there are many observers near the center and it is necessary to adjust so that the projected image on the screen 260 is appropriately observed from near the center, the evaluation value is a value indicating the center position, and there are many observers on the left side. When the projection image on the screen 260 needs to be adjusted so that it can be appropriately observed from the left side, the evaluation value becomes a value indicating the position on the left side, there are many observers on the right side, and the projection image on the screen 260 is When it is necessary to adjust so as to be appropriately observed from the right side, the evaluation value is a value indicating the position on the right side.

  As shown in FIG. 9, in the projection system 1 according to the present embodiment, the luminance of the first projector 210 and the luminance of the second projector 220 are changed according to the evaluation value of the position of the observer. For example, when the evaluation value indicates the value on the right side, the output of the light source unit 16 of the first projector 210 that emits the projection light that proceeds to the right side increases, and the luminance of the image projected by the first projector 210 is high. As the height increases, the output of the light source unit 16 of the second projector 220 that emits the projection light traveling to the left side decreases, and the brightness of the image projected by the second projector 220 decreases. Similarly, when the evaluation value indicates a value on the left side, the luminance of the image projected by the second projector 220 is increased, and the luminance of the image projected by the first projector 210 is decreased.

  In this embodiment, it is preferable to detect the position of the observer more finely (continuously) than in the case of the first embodiment. For this reason, it is preferable to use a sensor with higher resolution than the first embodiment, such as an ultrasonic sensor, for the human sensor 140.

  An example of the control related to the change of the brightness of the projector in the projection system 1 according to the present embodiment will be described with reference to the flowchart shown in FIG.

  In step S <b> 201, the control unit 110 acquires information related to the position of the observer from the human sensor 140. In step S <b> 202, the evaluation value calculation unit 112 of the control unit 110 calculates an evaluation value of the observer's position based on the acquired information related to the observer's position. The evaluation value is represented, for example, by the position of the center of gravity of the observer's position. Further, the evaluation value may be represented by a center of gravity position with a predetermined weight. In addition, the evaluation value may be any value that represents the distribution of the observers in front of the screen 260.

  In step S203, the output determining unit 114 of the control unit 110, based on the relationship between the evaluation value and the luminance shown in FIG. 9, the luminance of the projection light emitted from the first projector 210, that is, the first projector 210. The output of the light source unit 16 and the brightness of the projection light emitted from the second projector 220, that is, the output of the light source unit 16 of the second projector 220 are determined.

  In step S <b> 204, the projection control unit 116 of the control unit 110 determines the first projector based on the determined output of the light source unit 16 of the first projector 210 and the output of the light source unit 16 of the second projector 220. The operation of 210 and the second projector 220 is controlled. That is, the control unit 110 outputs a signal related to a projection instruction to the first projector 210 and the second projector 220. The CPU 25 of the first projector 210 and the second projector 220 causes the projection processing unit 14 to adjust the output intensity of the light source unit 16 based on this signal.

  In step S205, the control unit 110 determines whether to end the process. When it is determined that the process is to be terminated, the process is terminated. If it is not determined to end the process, the process returns to step S201.

  As described above, in the projection system 1 according to the present embodiment, the brightness of the projection light of the two projectors, that is, the output of the light source unit 16 is determined based on the combination of the positions of the observer acquired from the human sensor 140. The projection system 1 according to the present embodiment causes many observers to perform appropriate observation according to the position of the observer, and realizes energy saving.

[Third Embodiment]
A third embodiment will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. In the projection system 1 according to the first embodiment, a transmissive screen 260 is used as the screen, and the first projector 210 and the second projector 220 are arranged behind the screen 260. On the other hand, in the projection system 2 according to the present embodiment, the reflective screen 266 is used as the screen, and the first projector 210 and the second projector 220 are arranged in front of the screen 266.

  An outline of the projection system 2 according to this embodiment is shown in FIG. FIG. 12 is a schematic diagram showing the positional relationship between the first projector 210, the second projector 220, and the screen 266 and the observable area according to the present embodiment. In the projection system 2, the first projector 210 is disposed on the front left side of the screen 266, and the second projector 220 is disposed on the front right side of the screen 266.

  The projection light emitted from the first projector 210 arranged on the left side is reflected by the screen 266 to the front right side. This reflection makes it easy for the observer located on the right side to observe the reflected projection light. Further, the projection light emitted from the second projector 220 arranged on the right side is reflected to the left front side by the screen 266. This reflection makes it easy for the observer located on the left side to observe the reflected projection light.

  In the present embodiment, an ultrashort focus optical system is used for the projector so that, for example, an observer does not pass between the reflective screen 266 and each projector so as not to intervene. Is preferred. Other configurations of the control device 100 and the projector are the same as the configurations according to the first embodiment, and thus description thereof is omitted.

  Also in the present embodiment, the control unit 110 obtains information related to the position of the observer in front of the screen 266 from the human sensor 140, and performs projection by the first projector 210 and projection by the second projector 220. Is controlled. For example, when the observer is only on the front right side, the projection by the first projector 210 is performed, and the projection by the second projector 220 is not performed. Similarly, when the observer is only on the front left side, the projection by the second projector 220 is performed, and the projection by the first projector 210 is not performed. When the observer is only at the front center, projection by the first projector 210 and the second projector 220 is performed. Further, as in the second embodiment, the luminance of the first projector 210 and the second projector 220 may be adjusted using the evaluation value of the observer's position.

  Also according to the present embodiment, the same effects as those of the first embodiment and the second embodiment can be obtained.

[Fourth Embodiment]
A fourth embodiment will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. In the projection system 1 according to the first embodiment, the first projector 210 and the second projector 220 are disposed on the left and right sides of the screen 260. On the other hand, in the projection system 3 according to the present embodiment, the first projector 230 and the second projector 240 are arranged vertically above and below the screen 260.

  FIG. 13 is a schematic diagram showing the positional relationship between the first projector 230, the second projector 240, and the screen 260 and the observable area according to the present embodiment. In the present embodiment, the first projector 230 is disposed on the upper rear side of the screen 260. The projection light emitted from the first projector 230 travels to the front and lower sides of the screen 260, making it easy to observe from the front and lower sides of the screen 260. The second projector 240 is disposed on the lower rear side of the screen 260. The projection light emitted from the second projector 240 travels to the front and upper sides of the screen 260, and makes it easy to observe from the front and upper sides of the screen 260. Thus, the first projector 210 and the second projector 220 are arranged at different positions in the vertical direction, and the traveling directions of the projection light emitted from the respective projectors are different from each other in the vertical direction.

  In addition, the human sensor 140 according to the present embodiment includes a camera and photographs an observer who is in front of the screen 260 with the camera. The human sensor 140 analyzes an image obtained by photographing, and detects the position of the face of the observer in front of the screen 260, that is, the height of the observer.

  The operation of the projection system 3 according to this embodiment will be described. The control unit 110 acquires the position of the face of the observer detected by the human sensor 140, that is, information on the height of the observer. The control unit 110 acquires information related to the height of the observer from the human sensor 140, and controls projection by the first projector 210 and projection by the second projector 220 based on this information. For example, when an observer 940 with a short height is detected, the control unit 110 causes the first projector 230 to perform projection. At this time, the projection light emitted from the first projector 230 travels downward from the front of the screen 260. As a result, the observer 940 with a short height can easily view the image projected on the screen 260. When an observer 950 having a high height is detected, the control unit 110 causes the second projector 240 to perform projection. At this time, the projection light emitted from the second projector 240 travels upward from the front of the screen 260. As a result, an observer 950 having a high height can easily view the image projected on the screen 260. Further, as in the second embodiment, the luminance adjustment of the first projector 230 and the second projector 240 may be continuously performed using the evaluation value of the position of the observer.

  According to the present embodiment, by using two projectors, the first projector 230 and the second projector 240, the observable range in the vertical direction is expanded compared to the case where one projector is used. . For this reason, it becomes easy to visually recognize a projection image from the viewpoint of a child or an adult, for example. In addition, since unnecessary motion of the projector is suppressed by the human sensor 140, energy saving is realized in the projection system as in the first and second embodiments.

Moreover, this embodiment can be used in combination with the first embodiment and the second embodiment.
Further, the control unit 110 may perform control so that the images are continuously changed instead of switching the images.

  Further, a configuration in which one of the first projector 230 and the second projector 240 is rear projection and the other is front projection can be adopted.

Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1]
A screen on which projection light is projected;
At least two projection devices provided to project images onto the screen from different directions;
An acquisition unit for acquiring the observation position of the observer;
An output determining unit that determines outputs of the at least two projection apparatuses according to the observation position;
A projection system comprising: a projection control unit that controls operations of the at least two projection devices based on the output.
[2]
The at least two projection devices are arranged at different positions in the horizontal direction;
The traveling directions of the projection lights emitted from the at least two projectors are different from each other in the horizontal direction,
The acquisition unit acquires a horizontal position of the observer,
The output determining unit determines the outputs of the at least two projection devices based on a position of the observer in the horizontal direction so that the projection light travels in the direction of the observer;
The projection system according to [1].
[3]
The at least two projection devices are arranged at different vertical positions;
The traveling directions of the projection lights emitted from the at least two projectors are different from each other in the vertical direction,
The acquisition unit acquires the height of the observer,
The output determining unit determines the outputs of the at least two projection devices based on the height of the observer so that the projection light travels in the direction of the viewpoint of the observer.
The projection system according to [1] or [2].
[4]
Based on the position of the plurality of observers acquired by the acquisition unit, further comprising an evaluation value calculation unit that calculates an evaluation value expressing the arrangement of the plurality of observers,
The output determining unit determines the output based on the evaluation value so as to adjust a balance of brightness of the at least two projection apparatuses;
The projection system according to any one of [1] to [3].
[5]
The screen is a transmissive screen;
The projection device is disposed on the opposite side of the observer across the screen,
The projection system according to any one of [1] to [4].
[6]
The projection control unit receives different images from the at least two projection devices, and switches an image to be projected on the screen based on the observation position.
The projection system according to any one of [1] to [5].
[7]
The image projected on the screen includes a face;
The projection control unit causes the projection device to project the image in which the face is facing toward the observer based on the observation position.
The projection system according to any one of [1] to [6].
[8]
The projection system according to any one of [1] to [7], wherein the acquisition unit follows the observer.
[9]
A method for controlling a projection system that projects at least two projection devices that project an image onto a screen and projects the image onto the screen from at least two different directions.
Obtaining the observation position of the observer;
Determining outputs of the at least two projection devices according to the observation position;
Controlling the operations of the at least two projection devices based on the output.
[10]
A program for controlling a projection system that projects an image onto the screen from at least two different directions using at least two projection devices that project the image onto the screen,
Obtaining the observation position of the observer;
Determining outputs of the at least two projection devices according to the observation position;
A program for controlling a projection system that causes a computer to control operations of the at least two projection apparatuses based on the output.

  DESCRIPTION OF SYMBOLS 1, 2, 3 ... Projection system, 11 ... Input / output connector part, 12 ... Input / output interface, 13 ... Image conversion part, 14 ... Projection process part, 15 ... Micromirror element, 16 ... Light source part, 18 ... Mirror, 20 DESCRIPTION OF SYMBOLS Projection lens 26 ... Main memory 27 ... Program memory 28 ... Operation part 30 ... Sound processing part 32 ... Speaker, SB ... System bus 100 ... Control device 110 ... Control part 112 ... Evaluation value calculation part , 114 ... output determination unit, 116 ... photographing control unit, 140 ... human sensor, 150 ... recording unit, 160 ... input unit, 210, 230 ... first projector, 220, 240 ... second projector, 260, 266 …screen.

Claims (10)

A screen on which projection light is projected;
At least two projection devices provided to project images onto the screen from different directions;
An acquisition unit for acquiring the observation position of the observer;
An output determining unit that determines outputs of the at least two projection apparatuses according to the observation position;
A projection system comprising: a projection control unit that controls operations of the at least two projection devices based on the output. The at least two projection devices are arranged at different positions in the horizontal direction;
The traveling directions of the projection lights emitted from the at least two projectors are different from each other in the horizontal direction,
The acquisition unit acquires a horizontal position of the observer,
The output determining unit determines the outputs of the at least two projection devices based on a position of the observer in the horizontal direction so that the projection light travels in the direction of the observer;
The projection system according to claim 1. The at least two projection devices are arranged at different vertical positions;
The traveling directions of the projection lights emitted from the at least two projectors are different from each other in the vertical direction,
The acquisition unit acquires the height of the observer,
The output determining unit determines the outputs of the at least two projection devices based on the height of the observer so that the projection light travels in the direction of the viewpoint of the observer.
The projection system according to claim 1 or 2. Based on the position of the plurality of observers acquired by the acquisition unit, further comprising an evaluation value calculation unit that calculates an evaluation value expressing the arrangement of the plurality of observers,
The output determining unit determines the output based on the evaluation value so as to adjust a balance of brightness of the at least two projection apparatuses;
The projection system according to any one of claims 1 to 3. The screen is a transmissive screen;
The projection device is disposed on the opposite side of the observer across the screen,
The projection system according to any one of claims 1 to 4. The projection control unit receives different images from the at least two projection devices, and switches an image to be projected on the screen based on the observation position.
The projection system according to any one of claims 1 to 5. The image projected on the screen includes a face;
The projection control unit causes the projection device to project the image in which the face is facing toward the observer based on the observation position.
The projection system according to any one of claims 1 to 6.   The projection system according to claim 1, wherein the acquisition unit follows the observer. A method for controlling a projection system that projects at least two projection devices that project an image onto a screen and projects the image onto the screen from at least two different directions.
Obtaining the observation position of the observer;
Determining outputs of the at least two projection devices according to the observation position;
Controlling the operations of the at least two projection devices based on the output. A program for controlling a projection system that projects an image onto the screen from at least two different directions using at least two projection devices that project the image onto the screen,
Obtaining the observation position of the observer;
Determining outputs of the at least two projection devices according to the observation position;
A program for controlling a projection system that causes a computer to control operations of the at least two projection apparatuses based on the output.

Images