JP2015129876A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector device that exhibits a signage function through floor surface projection while suppressing projection light from directly entering the eyes of a person.SOLUTION: A projector 101 of the present invention includes: a light source 1; a projection lens 4 that receives light emitted from the light source 1 to project a video; a shutter 3 that prevents the light emitted from the light source 1 from reaching the projection lens 4; a shutter control unit 9 that controls the opening/closing operation of the shutter 3; a person information acquisition unit 6 that photographs a person in an entry detection range 31, which is an area including a projection range of the projection lens 4; and a protective operation control unit 7 that calculates an inclination angle θ of the head of the person in the entry detection range 31 from an image photographed by the person information acquisition unit 6. The shutter control unit 9 controls the opening/closing operation of the shutter 3 according to the inclination angle θ of the head of the person in the entry detection range 31.

Description

  The present invention relates to a projector that projects an image.

  A projector is a video display device that performs display by projecting video on a screen or the like using a projection lens.

  In recent years, since there are many projectors with high brightness, if a user or a surrounding person mistakenly looks into the projection lens during image projection, there is a possibility that the visual acuity may be temporarily lowered or the retina may be damaged. In order to prevent these situations, when it is considered that there is a person in the projection range of the projection lens, a projector device that limits the light emission amount or turns off the lamp is known (for example, Patent Document 1). reference).

  There is also known a projector device that can identify whether a person existing in the projection direction is likely to be an adult or a child, and can perform different anti-glare processing on each of them. (For example, refer to Patent Document 2).

JP 2006-330447 A JP 2005-258292 A

  However, projectors are used in a wide range of situations, and some projectors are installed on the ceiling and used for floor projection that projects images onto the floor. For example, interactive signage realized by floor projection. In interactive signage, when a person passes over a projected image, the image is changed in response to the movement, thereby producing a high visual effect and advertising effect. As described above, since it is assumed that floor projection is used when a person enters the projection range, the light is reduced just because a person is detected in the projection range as in the projector devices of Patent Documents 1 and 2. If it is turned off or turned off, the interactive signage function is impaired. However, since more people enter the projection area than when using a projector that projects images on the wall, etc., even if you look up and look into the projection lens by mistake, Must be kept out of human eyes.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a projector device that exhibits a signage function by floor projection while suppressing projection light from directly entering human eyes. .

  The projector of the present invention includes a light source, a projection lens that receives light emitted from the light source and projects an image, a shutter that prevents the light emitted from the light source from reaching the projection lens, and a shutter control unit that controls the opening and closing operation of the shutter. And a person photographing unit for photographing a person in the approach detection range, which is an area including the projection range of the projection lens, and an inclination calculation for calculating a tilt angle of the head of the person in the approach detection range from the photographed image of the person photographing unit The shutter control unit controls the opening / closing operation of the shutter according to the inclination angle of the head of the person in the entry detection range.

  The projector of the present invention includes a light source, a projection lens that receives light emitted from the light source and projects an image, a shutter that prevents the light emitted from the light source from reaching the projection lens, and a shutter control unit that controls the opening and closing operation of the shutter. And a person photographing unit for photographing a person in the approach detection range, which is an area including the projection range of the projection lens, and an inclination calculation for calculating a tilt angle of the head of the person in the approach detection range from the photographed image of the person photographing unit The shutter control unit controls the opening / closing operation of the shutter according to the inclination angle of the head of the person in the entry detection range. Therefore, the signage function by the floor projection can be exhibited while suppressing the projection light from directly entering the human eye.

1 is a block diagram illustrating a configuration of a projector according to a first embodiment. It is a figure which shows the structure of the projector which concerns on Embodiment 1, and its installation aspect. It is a top view which shows the positional relationship of a projection area | region, an approach detection range, and the imaging | photography range by a person information acquisition part. It is a figure which shows the inclination of the head of a person seen from the person information acquisition part. 6 is a flowchart showing an operation of the projector according to the first embodiment.

<A. Embodiment 1>
<A-1. Configuration>
FIG. 1 is a block diagram showing a configuration of projector 101 according to Embodiment 1 of the present invention. The projector 101 includes a light source 1, an internal circuit / optical system unit 2, a shutter 3, a projection lens 4, a projection range entry detection unit 5, a person information acquisition unit 6, a protection operation control unit 7, a light source control unit 8 and a shutter control unit 9 is provided.

  FIG. 2 is a diagram showing the configuration of the projector 101 and its installation mode. Among the components of the projector 101 shown in FIG. 1, the person information acquisition unit 6 is provided outside the housing 10, but the other components are housed in the housing 10. The housing 10 is attached to the ceiling surface 21. The internal circuit / optical system unit 2 performs a predetermined process on the light emitted from the light source 1 and outputs it to the shutter 3 and the projection lens. The shutter 3 is controlled to be opened and closed by the shutter control unit 9 and allows the output light of the internal circuit / optical system unit 2 to pass through the projection lens 4 in the open state, but not in the closed state. The projection lens 4 receives the output light from the internal circuit / optical system unit 2 and projects an image. The projection light 30 is applied to the floor surface.

  The light source control unit 8 controls the output of the light source 1 based on a command from the protection operation control unit 7 to be described later, and performs a dimming process. In addition, the shutter control unit 9 performs opening / closing control of the shutter 3 based on a command from the protection operation control unit 7 and executes blank processing as necessary.

  The in-projection range entry detection unit 5 uses the vicinity including the projection area 30 </ b> A of the projection lens 4 as the entry detection range 31, and detects whether a person is present in the entry detection range 31. Here, the projection area 30 </ b> A is an area of the floor surface 20 to which the projection light 30 of the projection lens 4 is irradiated. The in-projection range entry detection unit 5 is configured by, for example, an infrared sensor attached to the front surface of the housing 10, and detects a person in a direction perpendicular to the floor surface 20. However, here, the direction may not be strictly vertical, and detection may be performed between the housing 10 and the floor surface 20.

  The person information acquisition unit 6 acquires information about a person in the vicinity of the projection area 30A. The person information acquisition unit 6 is configured by, for example, an image sensor such as a camera installed on the wall surface 22 outside the housing 10, and captures an area including the entry detection range 31 from the horizontal direction on the floor 20. A person in the detection range 31 is photographed. That is, the person information acquisition unit 6 operates as a person photographing unit that photographs a person in the approach detection range 31. Note that the shooting direction does not have to be strictly parallel to the floor surface 20 and may have an angle with respect to the floor surface 20 as long as the angle of the head of a person described later can be determined from the captured image. In addition, the number of image sensors constituting the person information acquisition unit 6 may be at least one. However, if a plurality of image sensors are used to capture images from different angles, the detection accuracy can be improved, and is particularly useful when there are a large number of persons in the approach detection range 31.

  FIG. 3 is a plan view of the image projection direction, that is, the floor surface 20 as viewed from the housing 10 of the projector 101 installed on the ceiling surface 21. A part of the floor surface 20 becomes the projection area 30A, and the surrounding area including the projection area 30A becomes the entry detection range 31 of the in-projection area entry detection unit 5. If the person 40 exists in the approach detection range 31, the person information acquisition unit 6 takes a picture. In FIG. 3, the person information acquisition unit 6 includes two image sensors 6a and 6b, and the imaging directions of the image sensors 6a and 6b are different by 90 degrees. In addition, when the person information acquisition part 6 is comprised with a several image sensor, the installation position and installation angle of each image sensor are not restricted to this. The captured images of the person 40 by the image sensors 6 a and 6 b are sent to the protection operation control unit 7.

  The protection operation control unit 7 is connected to the person information acquisition unit 6 outside the housing 10 and acquires the captured image from the person information acquisition unit 6. Further, the detection result is acquired from the in-projection range entry detection unit 5. Then, based on the acquired information, it is determined whether or not the detected person 40 is viewing the projected image, and a protection operation control process described later is performed according to the determination.

  FIG. 4 shows a view of the person 40 viewed from one image sensor constituting the person information acquisition unit 6. The protection operation control unit 7 determines whether or not the person 40 photographed by the person information acquisition unit 6 is watching the projection image. When the person 40 is looking at the projection image of the floor surface 20, the head tilts forward as the person 40 approaches the projection area 30A. That is, if the angle when the head is tilted forward from the vertical state is θ, θ> 0. On the other hand, when the projected image is not viewed, the head tilt does not change from the vertical state. That is, θ = 0. In addition, when it is likely to look into the projection lens by mistake, the head is tilted backward. That is, θ <0.

  Therefore, the protection operation control unit 7 processes the photographed image of the person information acquisition unit 6 to detect the head tilt angle θ, and determines the direction in which the person 40 is looking based on θ. If the in-projection-range entry detector 5 detects the presence of a person, the light source 1 is controlled according to θ. That is, if θ = 0, it is determined that the person 40 passes through the projection region 30A without looking at the projection image and without looking into the projection lens, and causes the light source control unit 8 to perform the light source 1 dimming process. If θ <0, it is determined that the person 40 may look into the projection lens, and the shutter control unit 9 closes the shutter 3 so that the projector 101 enters a blank state. The above is the protection operation control process performed by the protection operation control unit 7.

  When the photographed image of the person information acquisition unit 6 includes a plurality of persons, the protection operation control unit 7 detects the tilt angle θ of the head for each person on the photographed image as described above. If there is one person who satisfies θ <0, the shutter control unit 9 closes the shutter 3 so that the projector 101 is in a blank state. If the inclination angle θ of the heads of all the members is 0, they are judged to only pass through the projection area and cause the light source control unit 8 to perform the light reduction process of the light source 1.

  Here, the inclination angle θ of the head is classified as θ = 0, θ <0, θ> 0, and an operation corresponding to that is performed. However, a predetermined threshold value may be set so that it is not determined that the head is tilted slightly and the projected image is being viewed or the projection lens is being viewed. Then, when the head tilt angle θ exceeds the threshold value and becomes a negative value or a positive value, the dimming process or the operation of closing the shutter 3 may be performed as described above.

  Further, not only the state in which the head is vertical is set to θ = 0, but the state in which the head is slightly downward or upward may be set to θ = 0.

  The projector 101 is provided with a CPU, ROM, RAM, and the like (not shown). By reading a program stored in the ROM and executing the program by the CPU, the light source control unit 8, the shutter control unit 9, and the protection operation control unit 7 are functionally realized. Note that the program shown in the flowchart of FIG. 5 to be described later is also stored in the ROM.

<A-2. Operation>
FIG. 5 is a flowchart showing protection operation control processing by the protection operation control unit 7. Hereinafter, the protection operation control process will be described with reference to FIG. The protection operation control process starts at the same time when the projector 101 starts projecting an image from the projection lens 4 and is executed until the image projection ends.

  The in-projection range entry detection unit 5 constantly monitors the entry detection range 31, and when a person is detected in the entry detection range 31 (Yes in step S1), the detection result is sent to the protection operation control unit 7. If no person is detected in the entry detection range 31, step S1 is repeated until it is detected.

  When the protection operation control unit 7 knows from the detection result that the entry detection range 31 has detected a person, the protection operation control unit 7 acquires a captured image of the person information acquisition unit 6 (step S2). Then, the photographed image is processed, and the detected head inclination angle θ of the person is calculated (step S3).

  If θ = 0 (Yes in step S4), it is determined that the detected person passes through the projection area 30A without seeing both the projection image and the projection lens 4, and the light source control section 8 A dimming process is started (step S5). If θ is not 0 (No in step S4) and θ> 0 is not satisfied (No in step S6), that is, if θ <0, it is determined that a person may look into the projection lens, and the shutter control unit 9 closes the shutter 3 and starts blanking (step S7). If θ> 0 (Yes in step S6), the process returns to step S1 without performing any special processing.

  After performing the dimming process (step S5) or the blanking process (step S7), the in-projection range entry detection unit 5 determines again whether or not there is a person in the entry detection range 31 (step S8). If a person is detected in the approach detection range 31 (Yes in step S8), it is determined that the person detected in step S1 still remains in the approach detection range 31, and the light reduction process or the blank process is continued. If no person is detected in step S8, it is determined that the person detected in step S1 has gone out of the entry detection range 31, and the light reduction process or the blank process is canceled (step S9). Then, the process returns to step S1. While the projector 101 is projecting an image, a series of operations from step S1 to step S9 is repeated.

<A-3. Effect>
The projector 101 according to the first embodiment includes a light source 1, a projection lens 4 that receives the light emitted from the light source 1 and projects an image, a shutter 3 that prevents the light emitted from the light source 1 from reaching the projection lens 4, A shutter control unit 9 that controls the opening / closing operation of the shutter 3, a person information acquisition unit 6 (person image capturing unit) that captures a person in the approach detection range 31 that includes the projection range of the projection lens 4, and person information acquisition A protection operation control unit 7 (tilt calculation unit) that calculates the tilt angle θ of the head of the person in the approach detection range 31 from the captured image of the unit 6. The shutter control unit 9 controls the opening / closing operation of the shutter 3 according to the inclination angle θ of the head of the person in the approach detection range 31. Therefore, when it is considered that the person may look into the projection lens 4 from the tilt angle θ of the person's head, the projection light is directly incident on the human eye by closing the shutter 3 and performing the blanking process. Can be prevented.

  The projection lens 4 projects an image from the upper side to the lower side of the person in the approach detection range 31. In the floor projection projector 101, as described above, the blanking process is performed according to the inclination angle θ of the person's head, thereby preventing the projection light from directly entering the human eye. The present invention is particularly useful when performing floor projection, such as for interactive signage, because people frequently enter the projection area 30A.

  The projector 101 further includes an in-projection range entry detection unit 5 (person detection unit) that detects whether or not there is a person in the entry detection range 31, and the person information acquisition unit 6 (person photographing unit) has an entry detection range. 31 is photographed from the horizontal direction, and the protection operation control unit 7 (tilt calculation unit) is based on the photographed image of the person information acquisition unit 6 when the in-projection range entry detection unit 5 detects that a person is in the entry detection range 31. Then, the inclination angle θ of the head of the person in the approach detection range 31 is calculated. Thus, the captured image of the person in the entry detection range 31 is acquired by acquiring the photographed image of the person information acquisition unit 6 when the in-projection range entry detection unit 5 detects that the person is in the entry detection range 31. Can be obtained.

  In addition, when the forward inclination angle θ is a positive angle and the backward inclination angle θ is a negative angle with respect to the vertical state of the head, the inclination angle of the head of the person in the approach detection range 31 Is less than a predetermined negative threshold value, the shutter control unit 9 performs control to close the shutter 3. When the tilt angle of the head is less than a predetermined negative threshold, it is considered that a person is looking upward and may look into the projection lens 4, so the shutter 3 is closed and blank processing is performed. Therefore, it is possible to prevent the projection light from directly entering the human eye.

  The projector 101 also includes a light source control unit 8 that controls the output of the light source 1 based on the inclination angle θ of the head of the person in the approach detection range 31. For example, if it is considered that there is no possibility that a person is looking at the projection image and looking into the projection lens 4 based on θ, the power consumption can be reduced by reducing the output of the light source 1. . Specifically, when the tilt angle θ is equal to or greater than a predetermined negative threshold and less than a predetermined positive threshold, the light source control unit 8 performs control to reduce the output of the light source 1.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 Light source, 2 Internal circuit / optical system part, 3 Shutter, 4 Projection lens, 5 Projection range approach detection part, 6 Person information acquisition part, 7 Protection operation control part, 8 Light source control part, 9 Shutter control part, 10 housings Body, 20 floor surface, 21 ceiling surface, 22 wall surface, 30 projection area, 31 approach detection range, 101 projector.

Claims (6)

A light source;
A projection lens for projecting an image by receiving light emitted from the light source;
A shutter that prevents the light emitted from the light source from reaching the projection lens;
A shutter control unit for controlling the opening and closing operation of the shutter;
A person photographing unit that photographs a person in an approach detection range that is an area including a projection range of the projection lens;
An inclination calculating unit for calculating an inclination angle of a head of a person in the approach detection range from a photographed image of the person photographing unit;
With
The shutter control unit controls the opening / closing operation of the shutter according to the tilt angle.
projector. The projection lens projects the image from above to below the person in the entry detection range;
The projector according to claim 1. A human detection unit for detecting whether there is a person in the entry detection range;
The person photographing unit photographs the entry detection range from a horizontal direction,
The inclination calculation unit calculates the inclination angle from a photographed image of the person photographing unit when the person detection unit detects that a person is in the entry detection range.
The projector according to claim 2. The shutter control unit is configured to detect the approach detection range when the tilt angle toward the front of the head is a positive angle and the tilt angle toward the rear is a negative angle with respect to the vertical state of the head. If the tilt angle of the head of the person in the room is less than a predetermined negative threshold, control to close the shutter is performed.
The projector according to claim 1. Further comprising a light source controller that controls the output of the light source based on the tilt angle of the head of the person in the entry detection range;
The projector according to claim 1. The light source control unit, when the inclination angle of the head of the person in the entry detection range is equal to or greater than the predetermined negative threshold and less than the predetermined positive threshold Control to lower the output of
The projector according to claim 5.

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