JP2014157316A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector device that detects a person present between the projector device and a projection surface, and controls projection of a part of the detected person, so as to project a clear image in a part other than the person while suppressing the intensity of projection light to the person.SOLUTION: A projector device 1 projects an image on a projection area, and includes: temperature distribution data acquisition means 11 for acquiring temperature distribution data on a projection area; heat source area specification means 15 for specifying a heat source area in the projection area on the basis of the temperature distribution data on the projection area acquired by the temperature distribution data acquisition means; and projection control means 17 for creating projection control information for limiting projection to the heat source area.

Description

  The present invention relates to a projector device that projects an image on a projection surface, and in particular, controls projection for a person between the projector device and the projection surface, and clearly projects an image on portions other than the person. The present invention relates to a projector device that can

In recent years, projector apparatuses that project an image onto a projection surface such as a screen have become widespread. Accordingly, a presenter stands in front of the projected image, and presentations that explain the image are also widely performed. When making such a presentation, the presenter stands between the projector device and the projection surface, so that not only does the presenter feel dazzling when the projection light output from the projector device enters the eyes of the presenter directly. There is a risk of damaging the eyes of the presenter.
In view of this, there is already known a projector device that controls the projection so that the person does not feel dazzling by detecting the person (presenter) between the projector and the projection surface and adjusting the amount of light at the time of projection.
For example, Patent Document 1 describes a projector device that switches a projection ON period in which projection onto a projection plane is performed and an OFF period in which projection onto a projection plane is not performed at a predetermined interval. In Patent Document 1, an image of a projection plane is captured by a camera device during a projection OFF period, and a person existing between the projector device and the projection plane is detected by comparing two different shooting data at the time of shooting. . When a person is detected, if a portion (for example, eyes, face, etc.) that should not be irradiated with projection light is further detected, a process for reducing or stopping the output of the projection light is performed.

However, the projector device described in Patent Document 1 merely detects whether or not there is any object between the projector device and the projection surface, and distinguishes and detects a person and an object other than a person. I don't mean. Therefore, when an object similar to a portion that should not be irradiated with projection light is detected even though an object other than a person is detected, the output of the projection light is reduced or stopped, so that the image is displayed. There is a problem of blurring. In addition, since the output of the projection light is reduced or stopped as a whole, even an image of a portion where no person is detected becomes unclear.
The present invention has been made in view of the above-described circumstances, and detects the person existing between the projector device and the projection surface, and controls the projection of the detected person part, thereby suppressing the amount of light projected on the person. However, an object of the present invention is to provide a projector device that can project a clear image in a portion other than a person.

  In order to solve the above-described problem, the invention according to claim 1 is a projector device that projects an image onto a projection area, the temperature distribution data acquisition means for acquiring the temperature distribution data of the projection area, and the temperature distribution Based on the temperature distribution data of the imaging area acquired by the data acquisition means, a heat source area specifying means for specifying a heat source area in the projection area and projection control information for restricting projection to the heat source area are generated. And a projection control means.

  Since a person usually shows a temperature higher than the ambient temperature, the person portion in the projection area appears as a heat source area in the temperature distribution data. In the present invention, since the projection control information for limiting the projection is generated for the heat source region, the amount of light projected onto the person portion can be suppressed by controlling the projection according to the generated projection control information.

It is a functional block diagram of the projector apparatus which concerns on one Embodiment of this invention. It is a figure explaining the relationship between the area | region where a projector apparatus projects an image, and the area | region which the camera with which the projector apparatus was equipped image | photographs. It is a figure which shows an example of the thermal image image | photographed with the thermal image camera. It is a schematic diagram for demonstrating the determination method of a projection control area | region.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .

The projector device according to the present embodiment is characterized in that it accurately detects where a person is in the projection area by photographing the projection area with a thermal image camera.
FIG. 1 is a functional block diagram of a projector apparatus according to an embodiment of the present invention.
As shown in FIG. 1, a projector device 1 is a device that projects an image such as a still image or a moving image onto a projection area 101 (see FIG. 2), and includes a thermal image camera 11 that captures the projection area as a subject, The heat source area in the projection area is identified based on the visible image camera 13 that captures the projection area as the image, the thermal image captured by the thermal image camera 11 and the visible image captured by the visible image camera 13, and the identified heat source A person area determination unit 15 (heat source area specifying means, person area specifying means) for specifying a person area where a person exists from the area, and a control unit 17 (projection) for generating projection control information for restricting projection onto the person area Control means).
In addition, the projector apparatus 1 includes an input image processing unit 19 that performs predetermined processing on image data input from the outside, and projection control generated by the control unit for image data processed by the input image processing unit 19. An output image generation unit 21 that performs a projection control process based on the information, and an image projection unit 23 that projects the output image data generated by the output image generation unit 21 onto the projection region 101 are provided.

  The outline of the operation of the projector device 1 according to this embodiment is as follows. That is, based on the thermal image captured by the thermal imaging camera 11, the person area determination unit 15 identifies a person (person area) that appears in the projection area 101. The control unit 17 generates projection control information that is information for limiting the projection for the specified person region. Based on the projection control information, the output image generation unit 21 generates output image data obtained by performing a projection control process (a process for reducing luminance) on an image data portion corresponding to a person area. The image projecting unit 23 projects the output image data. However, since the amount of light is reduced in the portion of the area where the luminance is reduced, the image other than the portion of the person can be clearly projected while limiting the amount of light projected onto the portion of the person.

  FIG. 2 is a diagram illustrating a relationship between a region where the projector device projects an image and a region where a camera provided in the projector device captures an image. In this specification, a screen, a wall surface, or the like on which the projector device projects an image is referred to as a projection surface 100, and a region on the projection surface 100 where an image is projected by the projector device 1 is referred to as a projection region 101. In addition, an area captured by the thermal image camera 11 and the visible image camera 13 in the projection plane 100 is referred to as an imaging area 102. Although details will be described later, the imaging region 102 is a region including at least the projection region 101.

Hereinafter, the details of each part constituting the projector device 1 will be described with reference to FIGS. 1 and 2.
The thermal image camera 11 is a camera that captures a thermal image of the imaging region 102 as a subject. The thermal image camera 11 is, for example, an infrared camera, detects infrared energy emitted from the imaging region 102, and obtains the temperature distribution (temperature distribution data) of the imaging region 102 as a thermal image. That is, the thermal image camera 11 functions as a temperature distribution data acquisition unit that acquires temperature distribution data of the projection area. Therefore, when a person is present between the projection surface 100 and the projector apparatus 1, the person and the object other than the person can be distinguished from each other by the temperature difference between the projection surface 100 and other objects, and only the person is highly accurate. Can be detected. The temperature distribution data input from the outside of the projector device 1 may be used.

The visible image camera 13 is a camera that captures a visible image of the imaging region 102 as a subject. The visible image camera 13 obtains an image projected on the projection plane 100 and a visible light image of an object existing between the projection plane 100 and the projector device 1. That is, the visible image camera 13 functions as a visible image data acquisition unit that acquires visible image data of the imaging region. The visible image data input from the outside of the projector device 1 may be used.
The thermal image camera 11 and the visible image camera 13 shoot the shooting area as a subject at regular intervals while the image projection unit 23 projects an image on the projection area, and the thermal image and the visible image are captured from each camera. obtain.

Here, the relationship between the projection area and the imaging area will be described.
The shooting areas shot by the thermal image camera 11 and the visible image camera 13 are set in advance to be in the same range. Here, it is easy to match the shooting areas shot by the two cameras in advance.
However, it is difficult to match the shooting area 102 and the projection area 101 in advance. That is, since the projection area changes depending on the distance between the projector apparatus and the projection plane, the relative relationship between the projection area and the imaging area also changes depending on the distance between the projector apparatus and the projection plane. Therefore, it is necessary to feed back information on the relative positional relationship between the imaging region and the projection region to the control unit 17.
Therefore, the projector device 1 includes a visible image camera 13 in addition to the thermal image camera 11. By analyzing the visible image captured by the visible image camera 13 in the person region determination unit 15, information on the relative positional relationship between the capturing region and the projection region is obtained.

  The person area determination unit 15 operates as a projection area determination unit that determines a projection area portion in the imaging area. The person area determination unit 15 analyzes a visible image captured by the visible image camera 13 and specifies a projection area in the imaging area. By this analysis, the position of the projection area with respect to the imaging area can be specified, and the relative relationship between the imaging area and the projection area can be grasped. The person area determination unit 15 uses information about the positional relationship between the imaging area and the projection area and the thermal image captured by the thermal imaging camera 11 to detect the heat source area, that is, the person in any part of the projection area. Can be understood. Further, since the projection area and the outer shape of the output image are similar, it can be determined which part of the output image should be reduced in brightness so that the projection of the projection area onto the human part can be restricted.

The person area determination unit 15 operates as a heat source area specifying unit that specifies all the heat source areas of the imaging area 102 based on the thermal image captured by the thermal imaging camera 11. That is, the person area determination unit 15 specifies all the heat source areas existing in the imaging area 102 from the thermal image captured by the thermal imaging camera 11. Here, the heat source region means a region showing a temperature higher than the ambient temperature in the projection region. Since a person usually shows a temperature higher than the ambient temperature, if the projection area is photographed by the thermal image camera 11, the person part appears as a heat source area.
The person area determination unit 15 operates as a person area specifying unit that specifies a person area in the shooting area 102 based on the thermal image captured by the thermal imaging camera 11. Here, the person area means an area where a person exists in the imaging area, and is an area included in the heat source area. The person area specified by the person area determination unit 15 may be a whole body area of the person or a partial area of the person. That is, the person area determination unit 15 may be a means for specifying a person area (a whole body area of a person) by regarding the heat source area reflected in the thermal image as the position of the person. Further, it may be a means for extracting only a region of a predetermined part of a person (partial region of a person) by image analysis from a heat source region reflected in the thermal image.

The control unit 17 operates as a projection control unit that generates projection control information for restricting projection onto a person area. That is, the control unit 17 generates projection control information for performing a projection control process on the image (image data) projected on the projection region 101 from the information on the human region output from the human region determination unit 15.
The projection control information includes at least information indicating a region in the image data to be subjected to the projection control process (projection control region: for example, a region corresponding to a person region). Further, the projection control information may include a luminance level instruction after the projection control process in the projection control area. Note that the control unit 17 may generate a masking image in which the projection control area is painted black as the projection control information.
As shown in the figure, the control unit 17 includes a CPU 17a and a memory 17b. The memory 17b includes a ROM that stores a program for realizing the processing described in each embodiment of the present invention, and a RAM that is an execution area of the program. An embodiment of the present invention is realized by reading a program from the ROM, developing it in the RAM, and executing it by the CPU 17a.

The input image processing unit 19 performs processing such as decoding, A / D conversion, and scaling on image data input to the projector device 1 from the outside and projected onto the projection plane 100.
The output image generation unit 21 performs a projection control process on the image data processed by the input image processing unit 19 based on the projection control information transmitted from the control unit 17.
The projection control process is a process for reducing the luminance level of the pixels in the projection control area indicated in the projection control information, for example. The projection control area in the image data is a portion that overlaps a person when an image based on the image data is projected onto the projection plane. Therefore, the luminance level is set to such an extent that the person feels not dazzling. Of course, the output image generation unit 21 may generate output image data in which the pixels in the projection control area are blackened (the luminance is zero).
When the control unit 17 generates a masking image in which the projection control area is blacked out as the projection control information, the output image generation unit generates output image data in which the masking image is superimposed on the image data.
The image projection unit 23 projects the output image data output from the output image generation unit 21 onto the projection plane 100. The amount of light can be artificially reduced in the image data portion on which the output image generation unit 21 has performed the projection control process.

Hereinafter, the person area specified by the person area determination unit will be described. FIG. 3 is a diagram illustrating an example of a thermal image captured by the thermal image camera. Since a person usually shows a temperature higher than the ambient temperature, when the photographing area 102 is photographed by a thermal image camera, the position of the person (heat source area 103) is determined by a temperature difference between the person and a part other than the person. Accurately grasp. The thermal image camera 11 can photograph the shape of a person existing in the photographing region 102.
The person area determination unit 15 may be a means for specifying the heat source area 103 photographed by the thermal image camera 11 as a person area (a whole body area of a person).
The person area determination unit holds a predetermined rubber rhythm for identifying the person portion from the shape of the heat source area 103 in order to distinguish between a person and a heat source other than the person, and based on this algorithm, the heat source A person area (a whole body area of a person) may be specified from the area.
The person area determination unit 15 holds a predetermined rubber rhythm for extracting a specific part of the person from the shape of the heat source area 103, and based on this algorithm, the person area (person partial area) is determined from the heat source area. May be specified. The head of the person portion to be identified is effective.

FIG. 4 is a schematic diagram for explaining a method for determining a projection control region.
As described above, the person area determination unit 15 extracts a person area in the projection area 101. The control unit 17 determines the projection control region and outputs projection control information so that the projection control processing is performed only on the person region extracted by the person region determination unit 15 or on a region obtained by adding a predetermined region to the person region.

4A and 4B are processing examples in the case where the person area determination unit 15 extracts the whole body area of the person as the person area 104. FIG. (A) is an example in which the control unit 17 determines the entire person area 104 as the projection control area 105. (B) is an example in which the control unit 17 determines the person area 104 and its neighboring area as the projection control area 105. Note that the neighborhood area of the person area is an area around the person area. For example, it is effective that the neighboring region is a region separated from a person by about 20 cm to 30 cm. In FIG. 5B, a predetermined graphic area including the person area 104 and its vicinity area is used as the projection control area 105.
FIGS. 4C and 4D are processing examples in the case where the person area determination unit 15 extracts a person face area as the person area 104. (C) is an example in which the control unit 17 determines the face area as the projection control area 105, and (d) is an example in which the face area and its neighboring area are determined as the projection control area 105.
FIG. 4E shows an example of processing when the person area determination unit 15 extracts the whole body area of the person as the person area 104. In this example, the control unit 17 determines a predetermined graphic area including a person area as the projection control area 105. In particular, all the upper and lower areas of the person area are set as projection control areas.

If the projection control area is narrowed as shown in FIGS. 4A and 4C, the range in which the image can be projected clearly as usual is widened. Increases nature.
However, when the movement of the person is intense, the projection control process cannot catch up, and there is a possibility that an image of a part that has not been subjected to the projection control process is projected onto the person. Therefore, as shown in FIGS. 4B and 4D, the anti-glare performance for a person can be improved by setting a neighborhood area for the person area. However, the range in which an image can be projected clearly becomes narrow.
In the example of FIG. 4E, the projection control process is also performed on the part other than the person area 104, so that the anti-glare performance for the person is high. Furthermore, since it is not necessary to specify the shape of the person in detail, the projection control process can be performed quickly. That is, it is sufficient to detect at least the left and right end coordinates (horizontal end coordinates) of the heat source area, and to set all the upper and lower areas of the coordinate range as the projection control area, thereby enabling rapid processing. .

  DESCRIPTION OF SYMBOLS 1 ... Projector apparatus, 11 ... Thermal image camera, 13 ... Visible image camera, 15 ... Person area judgment part, 17 ... Control part, 17a ... CPU, 17b ... Memory, 19 ... Input image processing part, 21 ... Output image generation part , 23 ... Image projection unit, 100 ... Projection plane, 101 ... Projection area, 102 ... Shooting area, 103 ... Heat source area, 104 ... Person area, 105 ... Projection control area

JP 2011-043689 A

Claims (9)

A projector device that projects an image onto a projection area,
Temperature distribution data acquisition means for acquiring temperature distribution data of the projection region;
Heat source region specifying means for specifying a heat source region in the projection region based on the temperature distribution data of the imaging region acquired by the temperature distribution data acquiring unit;
Projection control means for generating projection control information for limiting projection onto the heat source region. Visible image data acquisition means for acquiring visible image data of the imaging region,
The projector device according to claim 1, wherein the heat source region specifying unit specifies the heat source region based on the temperature distribution data and the visible image data acquired by the visible image data acquisition unit.   The projector device according to claim 1, wherein the heat source area specifying unit includes a person area specifying unit that specifies a person area where a person is present from the heat source area.   4. The projector apparatus according to claim 3, wherein the person area specifying unit specifies a whole body area or a partial area of the person as a person area based on a predetermined algorithm.   The projector apparatus according to claim 3, wherein the projection control unit generates projection control information for limiting projection onto the person area specified by the person area specifying unit.   5. The projector device according to claim 3, wherein the projection control unit generates projection control information for restricting projection to the person region specified by the person region specifying unit and the vicinity thereof. .   5. The projector according to claim 3, wherein the projection control unit generates projection control information for controlling projection onto a predetermined graphic area including the person area specified by the person area specifying unit. apparatus.   The projector apparatus according to claim 1, further comprising an output image generation unit that performs a projection control process on an image to be projected based on the projection control information.   The projector apparatus according to claim 8, wherein the projection control process is a process of reducing the luminance of an area indicated in the projection control information in a projected image to a predetermined level.

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