JP2014178375A - Image projection system and image projection device - Google Patents

Abstract

There is a situation in which an image projected on a projection surface is difficult to see depending on the state of light around the projection surface.
The present invention relates to a projection surface, an image projection unit that projects an image on the projection surface, a light receiving unit that receives light from the periphery of the projection surface, and a light intensity received by the light receiving unit. And a projection direction switching means for switching the image projection direction by the image projection means.
[Selection] Figure 1

Description

  The present invention relates to an image projection system and an image projection apparatus.

  As an image projection system, for example, there is a system using a projector that projects an image on a projection surface of a screen. The projector displays an image on the projection surface by the light projected on the screen. Therefore, for example, when there is a window on the rear side of the screen, when sunlight is incident from the window, the illuminance on the projection surface of the screen appears to be relatively lower than the illuminance behind the screen due to the backlight phenomenon. . Thereby, when a backlight phenomenon occurs, it becomes difficult to see the image projected on the projection surface of the screen.

  Therefore, a backlight detection device has been developed that compares the illuminance of the projection surface of the screen with the ambient illuminance of the screen, calculates the difference in illuminance, and determines the presence or absence of the backlight state from the calculation result (for example, see Patent Document 1) ).

  When it is detected that the backlight is in the backlight state by the backlight detection device, even if the light intensity of the image projected from the projector is increased, in the light state where, for example, the sun moves directly behind the screen or around the screen, There has been a problem that it becomes difficult to see the projected image.

  Therefore, in view of the above circumstances, an object of the present invention is to provide an image projection system and an image projection apparatus that avoid a situation in which an image projected on a screen is difficult to see depending on the state of light around the projection surface.

  In order to solve the above problems, the present invention has the following means.

The present invention includes a projection plane;
Image projecting means for projecting an image on the projection surface;
A light receiving means for receiving light from the periphery of the projection surface;
A projection direction switching means for switching an image projection direction by the image projection means according to the light intensity received by the light receiving means;
It is provided with.

  According to the present invention, it is possible to avoid a situation in which an image projected on a screen is difficult to see according to the state of light around the projection surface.

1 is a perspective view showing an embodiment of an image projection system according to the present invention. It is a top view of the image projection system by this invention. It is a front view which shows the attachment structure of a projector. It is a side view which shows the attachment structure of a screen and a projector. It is a block diagram which shows the control system of an image projection system. It is a flowchart of the projection switching control process 1 which a control apparatus performs. It is a flowchart of the projection switching control process 2 which a control apparatus performs.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Embodiment 1
FIG. 1 is a perspective view showing an embodiment of an image projection system according to the present invention. FIG. 2 is a plan view of the image projection system 10 according to the present invention. As shown in FIGS. 1 and 2, the image projection system 10 includes a screen 20 having a plurality of projection planes A to C, a projector (image projection means) 30 provided on the ceiling, and the projector 30 in the horizontal direction. And a projector support portion 40 that is rotatably supported.

  The screen 20 is installed inside the building window 50. The window 50 is fitted with transparent glass so that the surrounding scenery can be visually recognized from the room, and the room is irradiated with sunlight according to the weather. Therefore, a viewer and an operator who see the images projected on the projection planes A to C of the screen 20 see the projection planes A to C and the window 50 from below the projector 30.

  The projector 30 is rotatably supported by a rotation shaft 42 that extends in a vertical direction from a projector support 40 fixed to the ceiling. The projector support unit 40 includes a projection direction switching motor 44 (see FIG. 5) that rotates the rotation shaft 42 about the axis.

  The projector 30 and the projector support unit 40 are connected to a control device (control means) 60. As described later, the control device 60 outputs a projection direction switching signal to the projector support unit 40 when the backlight determination process determines that the backlight is in the backlight state, and rotates the projector 30 to set the projection direction to backlight. Switch to the direction that does not.

  The control device 60 may be provided separately from the projector 30 and the projector support unit 40, or may be stored in the housing of the projector 30 or the projector support unit 40. Further, the projector 30, the projector support unit 40, and the control device 60 constitute an image projection device. By incorporating the control device 60 inside the projector 30, the configuration of the image projection device becomes more compact and can be transported and installed. Work is simplified.

  The image projection apparatus also includes an image projection unit that projects an image on a projection plane, a light reception unit that receives light from the periphery of the projection plane, and an image projection by the image projection unit according to the light intensity received by the light reception unit. Projection direction switching means for switching the direction. The image projection apparatus may be configured such that each of these means is built in the projector 30 and can be handled as one unit.

  As shown in FIG. 2, since the projector 30 rotates about the rotation shaft 42 of the projector support unit 40, the center position of each projection plane A to C of the screen 20 and the center of the rotation shaft 42 are set. The distances LA to LC are arranged so as to be equidistant (LA = LB = LC). That is, the distance between the lens 32 provided on the front surface of the projector 30 and the projection surfaces A to C of the screen 20 is set to be a constant distance.

  FIG. 3 is a front view showing the mounting structure of the projector 30. FIG. 4 is a side view showing a mounting structure of the screen 20 and the projector 30. As shown in FIGS. 3 and 4, the projector 30 is coupled to a rotating shaft 42 of a projector support 40 fixed to the ceiling 70, and is attached with an angle θ inclined downward with respect to the horizontal direction. ing. Accordingly, the projector 30 can project an image on the entire projection surfaces A to C of the vertical screen 20.

  Further, an image sensor (light receiving means) 80 including a solid-state imaging device for detecting the light intensity in the projection direction in which the projection surfaces A to C of the screen 20 exist is provided on the front surface of the projector 30. The image sensor 80 only needs to be able to receive light in the projection direction, and may be provided inside the housing of the projector 30 or outside the housing of the projector 30.

[Configuration of Control Device 60]
FIG. 5 is a block diagram showing a control system of the image projection system. As illustrated in FIG. 5, the control device 60 includes an image generation unit 110, a light reception detection unit 120, a backlight detection setting unit 130, a projection direction switching control unit 140, a backlight determination unit 150, and a projection plane selection unit. 160 and CPU 170. For example, when image data stored in the personal computer 200 or the memory 300 is input according to an instruction from the CPU 170, the image generation unit 110 generates image data to be projected and outputs the image data to the projector 30.

  When the electric signal is input from the image sensor 80 at the timing when the detection start signal is input from the backlight detection setting unit 130, the light reception detection unit 120 outputs a light detection signal. The backlight detection setting unit 130 sets conditions for performing backlight determination processing input from the input device 400 such as a keyboard or a remote controller, and outputs a detection start signal to the light reception detection unit 120 based on the setting conditions. . The conditions set in the backlight detection setting unit 130 include, for example, condition 1: every predetermined time, condition 2: at the time of initial setting, condition 3: periodically performed every predetermined period, etc. The

  When a light detection signal is input from the light reception detection unit 120, the backlight determination unit 150 reads the light intensity received by the image sensor 80, and is in a backlight state when the light intensity is equal to or greater than a preset threshold. Judge that. When the backlight determination unit 150 determines that the backlight is in the backlight state, the backlight determination unit 150 outputs a projection direction switching signal based on the determination result to the CPU 170.

  The projection direction switching control unit 140 drives the projection direction switching motor 44 mounted on the projector support unit 40 according to a command from the CPU 170. The projection direction switching motor 44 rotates the rotation shaft 42 by a predetermined angle around the axis to move the projection direction of the projector 30 in the horizontal direction. At this time, rotation angle data detected by the rotation angle detection unit 46 mounted on the projector support unit 40 is input to the projection plane selection unit 160.

  The projection plane selection unit 160 selects the projection planes A to C corresponding to the rotation angle detected by the rotation angle detection unit 46, and inputs the central angle of the selected projection plane to the CPU 170. When the rotation angle detected by the rotation angle detection unit 46 reaches an angle corresponding to the center of the selected projection plane, the CPU 170 outputs a stop signal for stopping the rotation to the projection direction switching control unit 140. . Thus, the projector 30 is adjusted to a position where the projection direction is switched so that it faces the other projection surface that is not in the backlight state among the projection surfaces A to C. Therefore, in the image projection system 10, the image projection direction of the projector 30 can be switched in accordance with the movement of the sun with the passage of time, and the image is projected onto the projection surface that is not in the backlit state. This makes it easier to see the images.

[Projection Switching Control Processing 1 of Control Device 60]
FIG. 6 is a flowchart of the projection switching control process 1 executed by the control device 60. As shown in FIG. 6, the control device 60 checks in step S11 whether or not the backlight detection time for each predetermined time set in advance has been reached, and when it reaches the backlight detection time, step S12 is performed. Proceed to Note that the backlight detection time can be set as appropriate according to the installation location because the backlight detection setting unit 130 can set an arbitrary time based on the condition input by the input device 400.

  In step S12, the projection direction switching motor 44 mounted on the projector support unit 40 is driven so that the lens 32 and the image sensor 80 of the projector 30 face the projection plane B in the front direction that is the reference projection plane. When the rotation direction detected by the rotation angle detection unit 46 reaches the angle corresponding to the center of the selected projection plane B, the driving of the projection direction switching motor 44 is stopped. Thereby, the projection direction of the projector 30 is adjusted to the installation direction of the projection plane B. In step S13, the received light level (light intensity) detected by the image sensor 80 is read.

  In the next step S14, the difference between the received light levels detected by the image sensor 80 between the projection plane B and the window 50 is compared with a predetermined value (threshold value) set in advance (backlight determination means). In step S14, when the light reception level difference does not exceed the threshold value (in the case of NO), the process proceeds to step S15, and it is determined from the backlight determination result that the projection plane B in the front direction is not backlight.

  Then, it progresses to step S16 and determines the projection direction of the projector 30 to the projection surface B of the front. In step S <b> 17, projection of an image is started from the lens 32 of the projector 30 onto the projection plane B. Therefore, in the image projection system 10, the projection direction of the projector 30 is adjusted to the installation direction of the projection plane B that is not in the backlight state, and the image is projected, so that the projected image is easy to see.

  In the next step S18, it is checked whether or not the projection of the image by the projector 30 has been completed. In step S18, when the projection of the image by the projector 30 is not completed (in the case of NO), the process returns to step S11, and the processes after step S11 are repeated. In step S18, when the projection of the image by the projector 30 is finished (in the case of YES), the current control process is finished.

  If the received light level difference exceeds the threshold value in step S14 (YES), the process proceeds to step S19, and it is determined from the backlight determination result that the projection plane B in the front direction is in the backlight state. In the next step S20, the projector 30 is rotated leftward (projection direction switching means). That is, the projection direction switching motor 44 of the projector support unit 40 is driven so that the lens 32 and the image sensor 80 of the projector 30 face the projection surface A in the left direction. When the rotation angle detected by the rotation angle detection unit 46 reaches an angle corresponding to the center of the selected projection plane A, the driving of the projection direction switching motor 44 is stopped. Thereby, the projection direction of the projector 30 is adjusted to the installation direction of the projection plane A.

  In the next step S21, the difference between the received light levels detected by the image sensor 80 between the projection surface A and the window 50 is compared with a predetermined value (threshold value) set in advance (backlight determination means). In step S21, when the light reception level difference does not exceed the threshold value (in the case of NO), the process proceeds to step S22, and it is determined from the backlight determination result that the left projection plane A is not backlight.

  Then, it progresses to step S23 and determines the projection direction of the projector 30 to the projection surface A of the left direction. Then, the process proceeds to step S17 described above, and projection of an image from the lens 32 of the projector 30 onto the projection plane A is started. Therefore, the image is projected with the projection direction of the projector 30 adjusted to the installation direction of the projection plane A that is not in the backlight state, so that the projected image is easy to see.

  In step S21, if the light reception level difference exceeds the threshold (in the case of YES), the process proceeds to step S24, and it is determined from the backlight determination result that the left projection plane A is in the backlight state. In the next step S25, the projector 30 is rotated rightward (projection direction switching means). That is, the projection direction switching motor 44 of the projector support unit 40 is driven so that the lens 32 and the image sensor 80 of the projector 30 face the projection plane C in the right direction. When the rotation angle detected by the rotation angle detection unit 46 reaches an angle corresponding to the center of the selected projection plane C, the driving of the projection direction switching motor 44 is stopped. Thereby, the projection direction of the projector 30 is adjusted to the installation direction of the projection plane C.

  In the next step S26, the difference between the received light levels detected by the image sensor 80 between the projection surface C and the window 50 is compared with a predetermined value (threshold value) set in advance (backlight determination means). In step S26, when the light reception level difference does not exceed the threshold value (in the case of NO), the process proceeds to step S27, and it is determined from the backlight determination result that the right projection plane C is not backlight. In step S26, when the light reception level difference exceeds the threshold (in the case of YES), the process returns to step S13, and the processes after step S13 are executed.

  Then, it progresses to step S28 and determines the projection direction of the projector 30 to the projection surface C of the right direction. Then, the process proceeds to step S17 described above, and projection of an image from the lens 32 of the projector 30 onto the projection plane C is started. Therefore, the projection direction of the projector 30 is adjusted to the installation direction of the projection plane C that is not in the backlight state, and the image is projected, so that the projected image is easy to see.

  Thus, since the projector 30 determines that the backlight is in the backlight state when the sunlight entering through the window 50 is strong and switches the projection surface to another projection surface, it is difficult to see the image projected on the projection surface due to the backlight. Can be resolved. In addition, during the image projection, when the preset backlight detection time is reached, the backlight determination process is performed to switch the projection direction of the projector 30, so that not only the relative movement of the sun of the day, It is possible to deal with changes in the sun's height and weather (cloudy, rainy, sunny) due to weather.

  That is, according to the image projection system 10, the projection direction of the projector 30 is switched according to the state of light around the projection surface based on the light reception level detected by the image sensor 80, so that the image projected on the screen 20 can be seen. It is possible to avoid the difficult situation. Further, the image projection direction of the projector 30 can be switched in accordance with the movement of the sun with the passage of time, and the image is projected by adjusting the projection direction of the projector 30 to the installation direction of the projection surface that is not in the backlight state. Therefore, the projected image becomes easy to see.

  In the above description, the backlight determination process is performed in the order of the front projection plane B → projection plane A → projection plane C. The order of the backlight determination process is projection plane A → projection plane B → projection plane C, or It may be performed in the order of projection plane C → projection plane B → projection plane A, or the order may be changed every time.

  In the backlight determination process, the difference in intensity of light incident from each projection plane and the window 50 may be obtained and compared with a threshold value, or the light intensity from the window 50 may be detected by the image sensor 80, The light intensity of the window 50 may be compared with a threshold value.

[Embodiment 2]
FIG. 7 is a flowchart of the projection switching control process 2 executed by the control device 60. As shown in FIG. 7, the control device 60 reads the current time in step S31. In the next step S32, it is checked whether the backlight detection data at the current time is registered in the memory 300 or not.

  In step S32, when the backlight detection data at the current time is not registered in the memory 300 (NO), the process proceeds to step S33, and the backlight detection process is executed. In this backlight detection process, as in step S13 described above, the difference in the light reception level between the projection plane B and the window 50 detected by the image sensor 80 is compared with a preset threshold value. Then, when the light reception level difference does not exceed the threshold, it is determined that there is no backlight, and when the light reception level difference exceeds the threshold, it is determined that the backlight is in the backlight state.

  In the next step S34, the determination result of the backlight detection process in step S33 is stored in the backlight detection database of the memory 300. In the backlight detection database, determination results corresponding to the position of the sun at each time are registered. For example, the determination results registered by performing the backlight detection process every month or every three months when the season changes are registered. You may make it update.

  If the backlight detection data at the current time is registered in the memory 300 (YES) in step S32, the process proceeds to step S35. In step S35, the projection direction switching motor 44 mounted on the projector support unit 40 is driven so that the lens 32 and the image sensor 80 of the projector 30 face the projection plane B in the front direction that is the reference projection plane. When the rotation direction detected by the rotation angle detection unit 46 reaches the angle corresponding to the center of the selected projection plane B, the driving of the projection direction switching motor 44 is stopped.

  Thereby, the projection direction of the projector 30 is adjusted to the installation direction of the projection plane B. Therefore, the projection direction of the projector 30 is adjusted to the installation direction of the projection plane B that is not backlit, and the image is projected, so that the projected image is easy to see.

  In the next step S36, the light reception level (light intensity) detected by the image sensor 80 is read. Subsequently, the process proceeds to step S <b> 37, and the received light level difference between the projection plane B detected by the image sensor 80 and the window 50 is compared with a predetermined value (threshold value) set in advance.

  In step S37, when the light reception level difference exceeds the threshold (in the case of YES), the process proceeds to step S38. In step S38, it is determined from the backlight determination result that the projection plane B in the front direction is in the backlight state, and the projector 30 is rotated leftward or rightward to change the projection direction to the leftward projection plane A or right without backlight. The direction is switched to the installation direction of the projection plane C. Furthermore, in step S38, when another projection plane that is not in the backlight state is selected by the projection plane selection unit 160, the projection direction switching motor 44 is set so that the projection direction of the projector 30 faces the selected projection plane. Is controlled (projection direction switching means). Therefore, the image is projected with the projection direction of the projector 30 adjusted to the installation direction of the projection plane A or C that does not enter the backlight state, so that the projected image is easy to see.

  In step S37, if the difference in the received light level does not exceed the threshold value (in the case of NO), it is determined that the projection plane B in the front direction is not backlit, and the projection direction of the projector 30 is not changed.

  Subsequently, the process proceeds to step S39, and the projection of an image from the lens 32 of the projector 30 onto the projection plane B is started. During image projection by the projector 30, the backlight time zone data registered in the backlight detection database of the memory 300 is read, and the backlight detection data in the current projection direction (front direction of the projection plane B) is read from the memory 300 in step S40. Read.

  In the next step S41, it is checked whether the current time is in the backlight time zone based on the backlight detection data. In step S41, when the current time is the backlight time zone (in the case of YES), the process proceeds to step S42, and the projector 30 is rotated in the left-right direction to change the projection direction to the left projection surface A or the right direction without backlight. To the installation direction of the projection plane C. Furthermore, in step S42, when another projection plane that is not in the backlight state is selected by the projection plane selection unit 160, the projection direction switching motor 44 is set so that the projection direction of the projector 30 faces the selected projection plane. Is controlled. Therefore, the image is projected with the projection direction of the projector 30 adjusted to the installation direction of the projection plane A or C that does not enter the backlight state, so that the projected image is easy to see.

  In step S41, when the current time is not the backlight time zone (in the case of NO), it is determined that the projection plane B in the front direction is not the backlight, and the projection direction of the projector 30 is not changed.

  In the next step S43, it is checked whether or not the projection of the image by the projector 30 has been completed. In step S43, when the projection of the image by the projector 30 is not completed (in the case of NO), the process returns to step S40, and the processes after step S40 are repeated. In step S43, when the projection of the image by the projector 30 is finished (in the case of YES), the current control process is finished.

  In this way, in the projection switching control process 2, when the backlight detection data is registered in the memory 300, the light reception level of the image sensor 80 is not detected during projection, and the presence / absence of backlight is determined based on the backlight detection data. judge. Therefore, the control process in the control device 60 can be simplified, and the projection direction of the projector 30 can be automatically switched according to the backlight detection data in the time zone.

  That is, according to the second embodiment, since the projection direction of the projector 30 is switched according to the state of light around the projection surface based on the backlight detection data registered in the memory 300, the image projected on the screen 20 can be seen. It is possible to avoid the difficult situation. Further, the image projection direction of the projector 30 can be switched in accordance with the movement of the sun with the passage of time, and the image is projected by adjusting the projection direction of the projector 30 to the installation direction of the projection surface that is not in the backlight state. Therefore, the projected image becomes easy to see.

  Further, when the backlight detection data is stored in the memory 300 in advance, or when the backlight detection data can be read from another storage medium (such as a memory card), the processes of S31 to S38 are omitted. It is also possible to do.

  In addition, although the case where the projector 30 was attached to the ceiling 70 was demonstrated in the said embodiment, it is not restricted to this, For example, when the projector 30 is installed on the turntable which can be rotated and the backlight of a projection direction is detected Alternatively, the projection direction of the projector 30 may be switched by rotating the turntable.

  Moreover, in the said embodiment, although the case where the screen 20 and the projector 30 were installed inside the window 50 was mentioned as an example, it is applicable not only to this but when the screen 20 and the projector 30 are installed outdoors, for example. Of course.

  In the above embodiment, the case where an image is projected on the screen 20 having the three projection surfaces A to C has been described as an example. For example, a plurality of screens may be arranged in different directions, or Of course, three or more projection planes may be arranged.

DESCRIPTION OF SYMBOLS 10 Image projection system 20 Screen 30 Projector 40 Projector support part 42 Rotating shaft 44 Projection direction switching motor 50 Window 60 Control device 70 Ceiling 80 Image sensor 110 Image generation part 120 Light reception detection part 130 Backlight detection setting part 140 Projection direction switching control part 150 Backlight determination unit 160 Projection plane selection unit 170 CPU
200 Personal Computer 300 Memory 400 Input Device

JP 2011-188696 A

Claims (13)

A projection plane;
Image projecting means for projecting an image on the projection surface;
A light receiving means for receiving light from the periphery of the projection surface;
A projection direction switching means for switching an image projection direction by the image projection means according to the light intensity received by the light receiving means;
An image projection system comprising: Further comprising a backlight determination means for determining whether or not the backlight is in a backlight state according to the light intensity received by the light receiving means;
The image projection system according to claim 1, wherein the projection direction switching unit switches an image projection direction by the image projection unit when the backlight determination unit determines that the backlight is in the backlight state. The projection surface comprises a plurality of projection surfaces,
The image projecting means is provided so as to be rotatable in a horizontal direction,
3. The projection direction switching unit changes the image projection direction so that the image projection unit is rotated to project an image onto another projection plane among the plurality of projection planes. The image projection system described.   The image projection system according to claim 3, wherein the light receiving unit receives light from a periphery of a projection plane located in a projection direction by the image projection unit among the plurality of projection planes.   5. The backlight according to claim 2, wherein the backlight determining unit determines that the backlight is in a backlight state when light intensity around the projection surface received by the light receiving unit exceeds a predetermined value. The image projection system described.   6. The image projection system according to claim 1, wherein the light receiving unit detects light intensity around the projection surface at predetermined time intervals set in advance.   The image projection system according to claim 1, wherein the light receiving unit detects light intensity around the projection surface at an initial setting or periodically.   The image projection system according to claim 3, wherein each of the plurality of projection planes is provided at a position equidistant from the position of the image projection unit.   The image projection system according to claim 1, wherein the image projection unit is a projector, and projects an image toward the projection surface. Image projection means for projecting an image onto a projection surface;
A light receiving means for receiving light from the periphery of the projection surface;
A projection direction switching means for switching an image projection direction by the image projection means according to the light intensity received by the light receiving means;
An image projection apparatus comprising: Further comprising a backlight determination means for determining whether or not the backlight is in a backlight state according to the light intensity received by the light receiving means;
The image projection apparatus according to claim 10, wherein the projection direction switching unit switches an image projection direction by the image projection unit when the backlight determination unit determines that the backlight is in the backlight state. The projection surface comprises a plurality of projection surfaces,
The image projecting means is provided so as to be rotatable in a horizontal direction,
The projection direction switching means changes the image projection direction so as to rotate the image projection means to project an image onto another projection plane among the plurality of projection planes. The image projection apparatus described.   13. The image projection apparatus according to claim 12, wherein the light receiving unit receives light from a periphery of a projection plane located in a projection direction by the image projection unit among the plurality of projection planes.

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