JP2010034820A - Projector, control method of projector, and control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which prevents the obstruction of concentration of a viewer. <P>SOLUTION: The projector includes: a projection part 13 for projecting a projection object image as a projection image; a photographing part 14 for photographing an area including at least a part of the projection image and generating a photographed image; a face area detection part 30 for detecting the face area of a figure included in the photographed image generated by the photographing part 14; and a face area processing image generation part 31 for specifying an area corresponding to the face area in the projection object image on the basis of the face area detected by the face area detection part 30, replacing the inside of the specified area with a prescribed color and generating a face area processing image. The projection part 13 projects the face area processing image generated by the face area processing image generation part 31 as the projection image instead of the projection object image. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projector that projects an image, a control method for the projector, and a control program.

Conventionally, a projector that projects an image on a screen is known (for example, see Patent Document 1). When a presentation is performed using this type of projector, the presenter may make a presentation while standing in the vicinity of the screen and pointing to various types of information included in the image projected on the screen.
JP 2002-6397 A

However, in the projector described above, a presenter may be interposed between the projector and the screen during the presentation process, and an image may be projected onto the face of the presenter. In this case, various information contained in the image may be reflected on the face of the presenter, which is a place where there are relatively many movements accompanying the presentation, such as mouth movement due to speech and neck movement for screen confirmation. In such a case, the viewer's concentration on the presentation content may be hindered.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a projector that does not hinder the concentration of viewers on presentation contents.

In order to achieve the above object, the present invention provides a projector for projecting a projection target image as a projection image and a photographing unit for photographing a region including at least a part of the projection image to generate a photographed image. A face area detection unit for detecting a face area of a person included in the captured image generated by the imaging unit, and the face in the projection target image based on the face area detected by the face area detection unit. A face region processed image generation unit that specifies a region corresponding to the region and generates a face region processed image by replacing the specified region with a predetermined color, and the projection unit includes the projection target image. Instead, the face region processed image generated by the face region processed image generation unit is projected as the projection image.
According to this configuration, the projection unit projects the face region processed image generated by the face region processed image generation unit as a projection image instead of the projection target image. The face region processed image is an image obtained by replacing a portion corresponding to a human face with a predetermined color. For this reason, when a projection part projects a face area processed image, it will be in the state by which the predetermined color was projected instead of various information on the part corresponded to a person's face. In this case, it is possible to prevent various information from being displayed on the face of a person who is relatively moving, such as mouth movement due to speech and neck movement for screen confirmation. Concentration on is not hindered.

Here, in the projector according to the invention described above, the face area detection unit may detect the face area based on a comparison result between the projection target image and a captured image corresponding to the projection target image. .
According to this configuration, when detecting the face area from the photographed image, the face area detecting unit compares the projection target image with the photographed image, and narrows down the range in which the face area should be detected based on the comparison result. Since the face area is executed, it is possible to detect the face area more efficiently and accurately than in the case where the face area is detected from the entire captured image data.

In the projector according to the aspect of the invention, the predetermined color may be a color whose brightness is lower than the first reference brightness.
Here, the first reference brightness is such a brightness that the person does not feel dazzling when the projector 1 projects an image composed of a color having the first reference brightness onto the face of the person. That is. In addition to the effect that various kinds of information can be prevented from being displayed on the face of a person by setting the predetermined color to a color whose brightness is lower than the first reference brightness, the following effects can be obtained. That is, when the face region processed image is projected by the projection unit, a color having a lightness lower than the first reference lightness is projected onto a portion corresponding to a human face. Therefore, the person can feel the dazzle and the person can make a presentation with a natural expression, and the risk of damaging the eyes of the person can be reduced.

In the projector according to the aspect of the invention, the predetermined color may be a color whose brightness is higher than the second reference brightness.
Here, the second reference brightness means that when an image having a color having the second reference brightness is projected onto a person's face by the projection unit, the facial expression of the person is expressed by the viewer of the presentation. Lightness that can be visually recognized. In addition to the effect that various kinds of information can be prevented from being displayed on the face of a person by setting the predetermined color to a color whose brightness is higher than the second reference brightness, the following effects can be achieved. That is, when a face region processed image is projected by a projector, a color having a lightness higher than the second reference lightness is projected on the portion corresponding to the human face, so that the facial expression of the person The viewer can view it. Therefore, the viewer can recognize the person's facial expression, for example, to recognize that the person is talking about something important, or to recognize which part of the various information the person is currently viewing. And be able to understand the presentation more deeply.

Further, in the projector according to the invention described above, based on the face area detected by the face area detection unit, an arm area detection unit that detects an arm area of the person included in the captured image generated by the imaging unit; Based on the arm area detected by the arm area detection unit, a point corresponding to the arm area in the face area processed image is specified, and a point addition image is generated by adding a point to the specified position An image generation unit, and the projection unit may project the point addition image generated by the point addition image generation unit as the projection image instead of the projection target image.
According to this configuration, when the point addition image generated by the point addition image generation unit is projected by the projection unit, the point is automatically displayed at the location indicated by the person. Therefore, it is not necessary for the person to hold a special member or device such as a pointer or a laser pointer, and the convenience of the person can be improved.

  In order to achieve the above object, the present invention provides a projection unit that projects a projection target image as a projection image, a photographing unit that photographs a region including at least a part of the projection image, and generates a photographed image. A method of controlling a projector comprising: a face area of a person included in the captured image generated by the imaging unit; and the projection target based on the face area detected by the face area detection unit An area corresponding to the face area in the image is specified, and the inside of the specified area is replaced with a predetermined color to generate a face area processed image, and the projection unit replaces the projection target image with the face The face region processed image generated by the region processed image generation unit is projected as the projection image.

  In order to achieve the above object, the present invention provides a projection unit that projects a projection target image as a projection image, a photographing unit that photographs a region including at least a part of the projection image, and generates a photographed image. , A control program for controlling the projector by a computer, wherein the computer detects a face area of a person included in the captured image generated by the imaging unit, and the face area detection unit Based on the detected face region, a region corresponding to the face region in the projection target image is specified, and a face region processed image is generated by replacing the specified region with a predetermined color. In place of the image generation means and the projection target image, the projection unit uses the face region processed image generated by the face region processed image generation unit as the projection image. Thus to provide a control program for functioning a projection means for projecting a.

In order to achieve the above object, a projector according to the present invention captures a projection unit that projects a projection target image as a projection image, and captures an area including at least a part of the projection image to generate a captured image. Comparing the projection target image with the captured image, detecting a region where the images are different, and replacing at least a part of the region detected by the region detection unit with a predetermined color A region-processed image generation unit that generates a region-processed image, and the projection unit projects the region-processed image generated by the region-processed image generation unit as the projection image.
According to this configuration, when a person or object overlaps the projected image, the portion can be made inconspicuous by making it a predetermined color, and if it is made a black color, the glare of light entering the person's eyes can be reduced. Can be reduced.

In order to achieve the above object, a projector according to the present invention captures a projection unit that projects a projection target image as a projection image, and captures an area including at least a part of the projection image to generate a captured image. Comparing the projection target image with the captured image, detecting a region where the images are different, and replacing at least a part of the region detected by the region detection unit with a predetermined image A region-processed image generation unit that generates a region-processed image, and the projection unit projects the region-processed image generated by the region-processed image generation unit as the projection image.
According to this configuration, when a person or an object overlaps with a projection image, the portion can be made a predetermined image so as to be inconspicuous.

In order to achieve the above object, a projector according to the present invention captures a projection unit that projects a projection target image as a projection image, and captures an area including at least a part of the projection image to generate a captured image. A region detection unit that compares the projection target image with the captured image, detects a region in which the image is different, and a predetermined region at a predetermined distance from the region detected by the region detection unit A region processed image generation unit that generates a region processed image replaced with the image of the image, and the projection unit projects the region processed image generated by the region processed image generation unit as the projection image. Features.
According to this configuration, when a person or an object overlaps with the projection image, a portion away from the projection image by a predetermined distance can be indicated by the predetermined image.

  According to the present invention, an image in which a portion corresponding to a person's face is replaced with a predetermined color by a presenter is projected, so that information relating to the image can be prevented from being projected onto the person's face, and the viewer's It is possible to prevent the concentration on the presentation contents from being hindered.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a usage state of a projector 1 according to an embodiment to which the present invention is applied.
The projector 1 is a device that projects a projection image 2 a onto a screen 2 that is set apart from the projection lens unit 16 by emitting light from the projection lens unit 16. As shown in FIG. 1, the projection image 2a projected on the screen 2 includes an information image 2b. The information image 2b is an image related to various information such as characters, photographs, pictures, figures, tables, graphs, symbols, etc., other than the background, among the images included in the projection image 2a.
The projector 1 is used for a presentation by a presenter 3, for example. The presenter 3 can make an effective and easy-to-understand presentation by appropriately giving a presentation while pointing to the information image 2b projected on the screen 2.

FIG. 2 is a block diagram showing a functional configuration of the projector 1.
As shown in FIG. 2, the projector 1 includes a recording medium reading device 11, an operation unit 12, a projection unit 13, a photographing unit 14, and a control unit 20.
The recording medium reader 11 includes various types of projection target image data TD recorded on a recording medium such as an optical recording medium such as a next-generation DVD, DVD or CD, a memory device using a semiconductor storage element, and a magnetic recording medium. Data is read out and output to the control unit 20, specifically, a DVD player, a memory card reader, or the like. The projection target image data TD is image data that is the basis of the projection image 2 a projected by the projector 1. The control unit 20 stores the projection target image data TD input from the recording medium reading device 11 in the storage unit 22.
The operation unit 12 includes various switches such as a power switch for switching on / off the power of the projector 1, a switch for instructing start / end of projection, and a switch for adjusting the brightness of the projection image 2a. In response to this, an operation signal is output to the control unit 20. The operation unit 12 may include a remote controller (not shown) provided with the various switches described above.
The projection unit 13 includes a light source (not shown) provided with a light source lamp such as a high-pressure mercury lamp, a liquid crystal light valve (not shown) composed of a transmissive liquid crystal display panel, a projection optical system (not shown) provided with a projection lens and the like. The optical image is formed under the control of the control unit 20 and projected onto the screen 2 from the projection lens unit 16 (FIG. 1).
The imaging unit 14 shoots the screen 2 on which the projection image 2a is projected under the control of the control unit 20, and includes an imaging element (not shown) such as a CCD image sensor or a CMOS image sensor, and a photographic lens group. (Not shown) includes a lens driving unit (not shown) for driving the lens group to adjust zoom and focus. The imaging unit 14 generates captured image data SD by converting data output from the image sensor into data of a predetermined format, and outputs the generated captured image data SD to the control unit 20. The control unit 20 stores the input captured image data SD in the storage unit 22 described later as needed.

  The control unit 20 centrally controls each unit of the projector 1, and includes a CPU (Central Processing Unit) as a calculation execution unit, a basic control program executed by the CPU, and data related to the basic control program. ROM (Read Only Memory) that stores data in a nonvolatile manner, RAM (Random Access Memory) that temporarily stores programs executed by the CPU, data related to the programs, and other peripheral circuits. The control unit 20 receives the projection target image data TD from the recording medium reading device 11 and the signal input unit 21 to which the captured image data SD is input from the imaging unit 14, the projection target image data TD, and the captured image data. A storage unit 22 that stores various image data such as SD, face region processed image data KD, and point-added image data PD, which will be described later, and an image drawn based on the various image data stored in the storage unit 22 are stored. A frame memory 24, a liquid crystal panel drive control unit 25 that projects an optical image by the projection unit 13, a face region detection unit 30, a face region processed image generation unit 31 (region processed image generation unit), and an arm region detection unit 32 And a point addition image generation unit 33 (region processed image generation unit).

The control unit 20 draws an image in the frame memory 24 based on various image data stored in the storage unit 22. Subsequently, the control unit 20 drives the liquid crystal display panel of the projection unit 13 by the panel drive unit 26 included in the liquid crystal panel drive control unit 25 to display the image drawn in the frame memory 24 on the liquid crystal display panel.
In addition, the liquid crystal panel drive control unit 25 of the control unit 20 includes a trapezoidal distortion correction unit 27. The control unit 20 controls the shooting control unit 34 by the function of the trapezoidal distortion correction unit 27 to cause the shooting unit 14 to perform shooting, detects trapezoidal distortion in the projection image 2a based on the shot image data SD, and detects this trapezoid. A parameter for canceling the distortion is calculated. And the control part 20 performs the process by which the panel drive part 26 makes the liquid crystal display panel of the projection part 13 draw the image distorted based on the calculated parameter.

The face area detection unit 30 of the control unit 20 detects a human face area included in an image (hereinafter referred to as “captured image SG”) based on the captured image data SD input from the imaging unit 14. Here, a case where a person is included in the photographed image SG will be described. When a person is interposed between the projector 1 and the screen 2, the person is photographed by the photographing unit 14. A person is included in the captured image SG. In particular, when the presenter 3 (FIG. 1) is giving a presentation, the presenter 3 may move in front of the screen 2 during the presentation. In this case, the presenter 3 is photographed by the photographing unit 14 and generated by the photographing unit 14. The presenter 3 is included in the captured image SG.
In the present embodiment, for the convenience of explanation, it is assumed that only the presenter 3 (FIG. 1) who is presenting may be interposed between the projector 1 and the screen 2.
Here, a specific operation of the face area detection unit 30 will be described.

3A and 3B are diagrams for explaining the operation of the face area detection unit 30. FIG. 3A illustrates an example of the captured image SG generated by the imaging unit 14, and FIG. 3B illustrates the projection target image data TD. An example of an image based on (hereinafter, referred to as a “projection target image TG”) is shown, and FIG.
First, the face area detection unit 30 acquires projection target image data TD related to the projection image 2 a currently projected on the screen 2 from the storage unit 22. In addition, the face area detection unit 30 acquires the latest captured image data SD stored in the storage unit 22. The captured image data SD acquired here is obtained by capturing and generating the projection image 2a related to the acquired projection target image data TD by the capturing unit 14, and the captured image data SD and the projection target image data are generated. TD is data corresponding to each other.
Next, the face area detection unit 30 includes a captured image SG (FIG. 3A) related to the acquired captured image data SD, and a projection target image TG (FIG. 3B) related to the acquired projection target image data TD. , Compare. In this comparison, the face area detection unit 30 extracts a portion to be compared with the projection target image TG in the captured image SG shown in FIG. Specifically, as shown in FIG. 3A, a portion corresponding to the projection target image TG is extracted as a comparison image HG from the captured image SG. Further, the face area detection unit 30 performs normalization including distortion correction, brightness, and brightness correction on the extracted comparison image HG, and adjusts so that the comparison between the comparison image HG and the projection target image TG is normally performed. To do. Thereby, when the presenter 3 is not photographed by the photographing unit 14 and the presenter 3 is not included in the photographed image SG, the difference is not detected between the comparison image HG and the projection target image TG. Or it adjusts so that a difference may become below a threshold.

After comparing the captured image SG with the projection target image TG, the face area detection unit 30 detects the difference between these data based on the comparison result, and based on the detected difference, the difference image BG (FIG. 3C). ) Is generated. The difference image BG is an image generated when the photographing unit 14 photographs a person when the person is interposed between the projector 1 and the screen 2. In the present embodiment, since only the presenter 3 may be interposed between the projector 1 and the screen 2, the difference image BG generated here is between the projector 1 and the screen 2. This is caused by the interposition. Next, the face area detection unit 30 detects the face area of the presenter 3 from the difference image BG. For the detection of the face region, for example, an existing technique such as pattern matching using a template representing a face can be used.
As described above, when detecting the face area of the presenter 3 from the captured image SG, the face area detecting unit 30 according to the present embodiment generates the difference image BG based on the comparison result between the captured image SG and the projection target image TG. The face area is detected from the difference image BG. This difference image BG is an image generated due to the presenter 3 being interposed between the projector 1 and the screen 2. Therefore, compared with the case where the face area of the presenter 3 is detected from the entire photographed image SG using a method such as pattern matching, the face area to be detected is narrowed down. Is possible.
In the above-described operation, the control unit 20 functions as a region detection unit that compares the projection target image TG and the captured image SG, detects a region having a different image, and generates a difference image BG.

The face region processed image generation unit 31 of the control unit 20 corresponds to the face region in the projection target image TG corresponding to the photographed image data SD based on the face region in the photographed image SG detected by the face region detection unit 30. Identify the area. The face area processed image generation unit 31 generates a face area processed image KG that is an image obtained by replacing the specified area of the projection target image TG with a predetermined color, and the face area related to the face area processed image KG. Processed image data KD is generated and stored in the storage unit 22.
Here, an example of a specific operation of the face area processed image generation unit 31 will be described with reference to FIG.

4A and 4B are diagrams for explaining the operation of the face area processed image generation unit 31. FIG. 4A shows an example of the captured image SG, and FIG. 4B shows an example of the face area processed image KG.
For example, the face area processed image generation unit 31 acquires coordinate values indicating the face area 40 (FIG. 4A) in the captured image SG, and sets coordinate values corresponding to the acquired coordinate values in the projection target image TG. The area indicated by the calculated coordinate value is specified as an area corresponding to the face area (hereinafter referred to as “face corresponding area”). Next, the face area processed image generation unit 31 generates a face area processed image KG (FIG. 4B), which is an image obtained by replacing the face corresponding area of the projection target image TG with a predetermined color, and relates to this image. Face area processed image data KD is generated and stored in the storage unit 22.
Thus, the face region processed image KG is an image obtained by replacing a portion corresponding to the face of the presenter 3 with a predetermined color. For this reason, when the projector 1 projects the face region processed image KG, a predetermined color is projected on the portion corresponding to the face of the presenter 3 instead of the information image 2b. In this case, it is possible to prevent the information image 2b from being displayed on the face of the presenter 3, which is a place where there are relatively many movements accompanying the presentation, such as movement of the mouth due to speech and movement of the neck for checking the screen 2. , The viewer's concentration on the presentation content is not hindered.

Here, the predetermined color of the face corresponding area of the face area processed image KG will be described in detail.
In the present embodiment, the predetermined color is a color whose brightness is lower than the first reference brightness. The first reference lightness is such a lightness that the presenter 3 does not feel glare when an image composed of a color having the first reference lightness is projected onto the face of the presenter 3 by the projection unit 13. That is. In addition to the effect that the information image 2b can be prevented from being displayed on the face of the presenter 3 by setting the predetermined color to a color with a lightness lower than the first reference lightness, the following effects can be achieved. it can. That is, when the image related to the face area processed image data KD is projected by the projector 1, a color having a lightness lower than the first reference lightness is projected onto a portion corresponding to the face of the presenter 3. Therefore, the presenter 3 does not feel dazzling, the presenter 3 can make a presentation with a natural expression, and the risk of damaging the eyes of the presenter 3 can be reduced.

The arm region detection unit 32 of the control unit 20 detects a person's arm region from the photographed image SG based on the face region detected by the face region detection unit 30. Here, an example of a specific operation of the arm region detection unit 32 will be described.
The arm region detection unit 32 estimates the position of the arm region in the difference image from the position of the face region in the difference image generated by the face region detection unit 30. The difference image is an image generated based on the difference caused by the presence of the presenter 3, and the arm region is included in the difference image.
Next, the arm region detection unit 32 specifies the arm region with respect to the range estimated as the position of the arm region in the difference image, for example, by a method such as pattern matching. In specifying the arm region, the arm region exposed from the clothes worn by the presenter 3 may be detected by skin color detection to specify the arm region. Furthermore, the arm region detection unit 32 according to the present embodiment detects a region corresponding to the hand (hereinafter referred to as “hand region”) among the detected arm regions by means such as pattern matching and skin color detection.

  The point addition image generation unit 33 of the control unit 20 is an image in which points are added to locations corresponding to the arm regions detected by the arm region detection unit 32 in the face region processing image KG generated by the face region processing image generation unit 31. A point added image PG is generated, point added image data PD related to the point added image PG is generated, and the point added image data PD is stored in the storage unit 22. Here, an example of a specific operation of the point-added image generation unit 33 will be described with reference to FIG.

5A and 5B are diagrams for explaining the operation of the point-added image generation unit 33. FIG. 5A illustrates an example of the captured image SG, and FIG. 5B illustrates an example of the point-added image PG.
The point addition image generation unit 33 acquires coordinate values indicating the hand region 41 (FIG. 5A) in the arm region in the captured image SG, and coordinates corresponding to the acquired coordinate values in the face region processed image KG. A value is calculated, and an area indicated by the calculated coordinate value is specified as an area corresponding to the hand area (hereinafter referred to as “hand corresponding area”). Next, the point addition image generation unit 33 generates a point addition image PG in which the point P (FIG. 5B) is added to the hand corresponding region of the face region processed image KG, and the point addition image related to the point addition image PG. Data PD is generated.
As described above, the point-added image generation unit 33 generates the point-added image PG in which a point is added to a location corresponding to the hand-corresponding region. When the generated point-added image PG is projected by the projection unit 13, the presenter The point P is automatically displayed at the location indicated by 3. Therefore, the presenter 3 can display a point at a point to be pointed without holding a special member or device such as a pointer or a laser pointer, and the convenience of the presenter 3 can be improved.
Although the case where the point P is added to the hand corresponding area has been described as an example, the place where the point P is added is not limited to this, and the arm extends from the shape of the arm area detected by the arm area detecting unit 32. A direction may be specified, and a point P may be added on an extension line of the specified direction. Further, the point P may be added to a predetermined area located at a predetermined distance from a position corresponding to the hand area 41 or the like.

Next, the operation of the projector 1 according to this embodiment will be described.
FIG. 6 is a flowchart showing the operation of the projector 1.
First, the face area detection unit 30 of the control unit 20 samples the captured image data SD at a predetermined cycle, and detects a face area included in the sampled captured image SG (step SA1). Further, the control unit 20 determines whether or not a face region is detected in the captured image SG by the face region detection unit 30 (step SA2). When a face area is detected in the captured image SG by the face area detection unit 30 (step SA2: YES), the face area processed image generation unit 31 of the control unit 20 generates face area processed image data KD, and the storage unit 22 (Step SA3). Next, the control unit 20 determines whether or not the point-added image data PD needs to be generated by the point-added image generation unit 33 (step SA4). Here, a specific example is given and demonstrated about the process of step SA4.

For example, the control unit 20 samples the captured image data SD at a predetermined period in advance, detects the arm region by the arm region detection unit 32 for each sampled captured image data SD, and changes the state of the arm region. By detecting this, it is determined whether or not the arm state of the person has changed only within a predetermined range for a certain time (for example, 2 to 3 seconds) or more. If the arm state has changed only within a predetermined range for a certain time or longer, it is necessary to generate point-added image data PD by the point-added image generation unit 33 in the process of step SA4. Determine. This is a state in which the presenter 3 points to the screen 2 when the arm state has changed only within a predetermined range for a certain period of time, and therefore, it is considered that the arm state has not changed. It is because it can do.
Further, for example, the control unit 20 detects the arm region and the hand region by the arm region detection unit 32, and when the position of the hand region is higher than a predetermined position (for example, a position where the face region exists), the control unit 20 In the process, it is determined that the point-added image data PD needs to be generated. This is because when the hand region is higher than a predetermined position, the presenter 3 can be regarded as a state in which the hand is intentionally raised with the purpose of pointing to the screen 2.

  When it is determined in step SA4 that the point-added image data PD needs to be generated (step SA4: YES), the control unit 20 generates the point-added image data PD by the point-added image generation unit 33, and the storage unit 22 (Step SA5). Then, the control unit 20 projects the point addition image PG generated and stored in step SA5 onto the screen 2 as the projection image 2a (step SA6). Here, the projection image 2a projected on the screen 2 is an image in which the portion corresponding to the face of the presenter 3 is replaced with a predetermined color as described above. Instead of the image 2b, a predetermined color is projected. Thereby, it is possible to prevent the information image 2b from being displayed on the face of the presenter 3, which is a place where the movement accompanying the presentation is relatively large, such as the movement of the mouth by speech and the movement of the neck for checking the screen 2. , The viewer's concentration on the presentation is not disturbed. Since the pointer is automatically added to the projection image 2a projected on the screen 2 here, the convenience of the presenter 3 is improved as described above.

On the other hand, when it is determined that it is not necessary to generate the point-added image data PD (step SA4: NO), the control unit 20 outputs the face area processed image KG generated and stored in step SA3 via the projection unit 13 to the screen 2. (Step SA7). Here, the projection image 2a projected on the screen 2 is an image in which a portion corresponding to the face of the presenter 3 is replaced with a predetermined color as described above.
The control unit 20 repeats the above-described processing at a predetermined interval (for example, every second). Thereby, even when the face of the presenter 3 is moved, a state in which a predetermined color is projected in place of the information image 2b on the portion corresponding to the face of the presenter 3 following the movement of the face. Is maintained.

  As described above, according to the present invention, when the presenter 3 is interposed between the projector 1 and the screen 2, the face region processed image KG generated by the face region processed image generation unit 31 is the projection unit 13. Projected by. Here, the face region processed image KG is an image obtained by replacing a portion corresponding to the face of the presenter 3 with a predetermined color. Therefore, when the projection unit 13 projects an image related to the face area processed image data KD, a predetermined color is projected on the portion corresponding to the face of the presenter 3 instead of the information image 2b. In this case, it is possible to prevent the information image 2b from being displayed on the face of the presenter 3, which is a place where there are relatively many movements accompanying the presentation, such as movement of the mouth due to speech and movement of the neck for checking the screen 2. , The viewer's concentration on the presentation content is not hindered.

  Further, according to the present embodiment, the face area detection unit 30 detects the face area based on the comparison result between the projection target image TG and the captured image SG corresponding to the projection target image. Specifically, when detecting the face area of the presenter 3 from the photographed image SG, the face area detection unit 30 generates a difference image based on the comparison result between the photographed image SG and the projection target image TG. To detect a face region. This difference image is an image generated due to the presenter 3 being interposed between the projector 1 and the screen 2. For this reason, compared with the case where the face area of the presenter 3 is detected from the entire photographed image data SD using a method such as pattern matching, the face area to be detected is narrowed down. Detection is possible.

  In the present embodiment, the predetermined color of the face-corresponding area of the face area processed image KG is a color whose brightness is lower than the first reference brightness. The first reference brightness is a brightness at which the presenter 3 does not feel glare when an image composed of a color having the first reference brightness is projected onto the face of the presenter 3 by the projector 1. It is. In addition to the effect that the information image 2b can be prevented from being displayed on the face of the presenter 3 by setting the predetermined color to a color with a lightness lower than the first reference lightness, the following effects can be achieved. it can. That is, when the image related to the face area processed image data KD is projected by the projector 1, a color having a lightness lower than the first reference lightness is projected onto a portion corresponding to the face of the presenter 3. Therefore, the presenter 3 does not feel dazzling, the presenter 3 can make a presentation with a natural expression, and the risk of damaging the eyes of the presenter 3 can be reduced.

  In addition, the projector 1 according to the present embodiment includes a point-added image generation unit 33 that generates point-added image data PD. When the point addition image PG generated by the point addition image generation unit 33 is projected by the projector 1, the point is automatically displayed at the location indicated by the presenter 3. Therefore, it is not necessary for the presenter 3 to hold a special member or device such as a pointer or a laser pointer, and the convenience of the presenter 3 can be improved.

  In addition, when the projector 1 according to the present embodiment compares the projection target image TG and the captured image SG by the region detection unit and detects a region having a different image, at least a part of the detected region (difference image BG). An area processed image such as the face area processed image KG is generated by replacing (for example, a face area) with a predetermined color. When this region-processed image is projected by the projection unit 13, when a person or an object overlaps the projection image, the portion can be made inconspicuous and can be made inconspicuous. Can reduce the glare of light entering the eyes.

In addition, as described above, the projector 1 according to the present embodiment compares the projection target image TG and the captured image SG by the region detection unit, detects a region having a different image, and detects the region detected by the region detection unit. For example, a configuration may be adopted in which a predetermined region located at a predetermined distance from the hand region 41 is replaced with a predetermined image (point P).
According to this configuration, when a person or an object overlaps with the projection image, a portion away from the projection image by a predetermined distance can be indicated by the predetermined image.

The above-described embodiments merely show one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the present invention.
For example, in the above-described embodiment, the predetermined color has been described by taking a color whose brightness is lower than the first reference brightness as an example. However, the predetermined color may be a color whose brightness is higher than the second reference brightness. Here, the second reference brightness is the expression of the face of the presenter 3 when viewing an image of a color having the second reference brightness on the face of the presenter 3 when projected by the projector 1. It is lightness that can be visually recognized. In addition to the effect that the information image 2b can be prevented from being displayed on the face of the presenter 3 by setting the predetermined color to a color whose brightness is higher than the second reference brightness, the following effects can be achieved. it can. That is, when the face region processed image KG is projected by the projector 1, the color corresponding to the face of the presenter 3 is projected with a color whose brightness is higher than the second reference brightness. Can be viewed by the viewer of the presentation. Therefore, the viewer can recognize, for example, that the presenter 3 is currently talking about what is important by visually recognizing the expression of the presenter 3, or can view which part of the information image 2b the presenter 3 is currently viewing. You will be able to recognize the presentation and understand the presentation more deeply.

  In the above-described embodiment, the face region processed image generation unit 31 is an image in which the face region processed image KG generated by the face region processed image generation unit 31 is an image obtained by replacing a portion corresponding to the face of the presenter with a predetermined color. there were. However, the face region processed image KG may be an image in which a portion corresponding to the face of the presenter is not replaced with a predetermined color but an image replaced with a predetermined image. Examples of the predetermined image include an image in which a black diagonal line is drawn on a white background. Even with this configuration, similarly to the projector 1 according to the above-described embodiment, the information image 2b can be prevented from being projected on the face of the presenter 3, and the viewer's concentration on the presentation content is not hindered. Can be played.

It is the schematic which shows the use condition of the projector which concerns on this embodiment. It is a block diagram which shows the functional structure of a projector. It is a figure used for description of operation | movement of a face area | region detection part. It is a figure used for description of operation | movement of a face area | region process image generation part. It is a figure used for description of operation | movement of a point addition image generation part. It is a flowchart which shows operation | movement of a projector.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2a ... Projection image, 3 ... Presenter (person), 13 ... Projection part, 14 ... Imaging | photography part, 30 ... Face area detection part, 31 ... Face area process image generation part (area process image generation part), 32 ... arm region detection unit, 33 ... point added image generation unit (region processed image back west part), KD ... face region processed image data, PD ... point added image data, SD ... photographed image data, TD ... projection target image data.

Claims (10)

A projection unit that projects the projection target image as a projection image;
An imaging unit that captures an area including at least a part of the projected image and generates a captured image;
A face area detection unit that detects a face area of a person included in the captured image generated by the imaging unit;
Based on the face area detected by the face area detection unit, an area corresponding to the face area in the projection target image is specified, and the specified area is replaced with a predetermined color to process a face area processed image A face region processed image generation unit for generating
The projection unit projects the face region processed image generated by the face region processed image generation unit as the projection image instead of the projection target image.
Projector. The face area detection unit detects the face area based on a comparison result between the projection target image and a captured image corresponding to the projection target image;
The projector according to claim 1. The predetermined color is a color having a lightness lower than the first reference lightness;
The projector according to claim 1 or 2. The predetermined color is a color having a lightness higher than the second reference lightness;
The projector according to claim 1 or 2. An arm region detection unit that detects an arm region of the person included in the captured image generated by the imaging unit based on the face region detected by the face region detection unit;
Based on the arm region detected by the arm region detection unit, a point corresponding to the arm region in the face region processed image is specified, and a point addition image in which a point is added to the specified portion is generated An additional image generation unit,
The projection unit projects the point addition image generated by the point addition image generation unit as the projection image instead of the projection target image;
The projector according to claim 1, wherein: A projector control method comprising: a projection unit that projects a projection target image as a projection image; and a photographing unit that photographs a region including at least a part of the projection image and generates a photographed image.
Detecting a human face area included in the captured image generated by the imaging unit;
Based on the face area detected by the face area detection unit, an area corresponding to the face area in the projection target image is specified, and the specified area is replaced with a predetermined color to process a face area processed image Produces
The projection unit projects the face region processed image generated by the face region processed image generation unit as the projection image instead of the projection target image.
A projector control method characterized by the above. A control program for controlling, by a computer, a projector comprising: a projection unit that projects a projection target image as a projection image; and an imaging unit that captures an area including at least a part of the projection image and generates a captured image. There,
Computer
Face area detection means for detecting a face area of a person included in the captured image generated by the imaging unit;
Based on the face area detected by the face area detecting means, an area corresponding to the face area in the projection target image is specified, and the specified area is replaced with a predetermined color to process a face area processed image A face region processed image generating means for generating
A control program for causing the face area processed image generated by the face area processed image generation unit to function as a projection unit that projects by the projection unit as the projection image instead of the projection target image. A projection unit that projects the projection target image as a projection image;
An imaging unit that captures an area including at least a part of the projected image and generates a captured image;
An area detection unit that compares the projection target image and the captured image and detects areas in which the images are different;
A region processed image generation unit that generates a region processed image by replacing at least a part of the region detected by the region detection unit with a predetermined color;
The projection unit projects the region processed image generated by the region processed image generation unit as the projection image;
Projector. A projection unit that projects the projection target image as a projection image;
An imaging unit that captures an area including at least a part of the projected image and generates a captured image;
An area detection unit that compares the projection target image and the captured image and detects areas in which the images are different;
A region processed image generation unit that generates a region processed image by replacing at least a part of the region detected by the region detection unit with a predetermined image;
The projection unit projects the region processed image generated by the region processed image generation unit as the projection image;
Projector. A projection unit that projects the projection target image as a projection image;
An imaging unit that captures an area including at least a part of the projected image and generates a captured image;
An area detection unit that compares the projection target image and the captured image and detects areas in which the images are different;
A region processed image generating unit that generates a region processed image in which a predetermined region located at a predetermined distance from the region detected by the region detecting unit is replaced with a predetermined image;
The projection unit projects the region processed image generated by the region processed image generation unit as the projection image;
Projector.

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