JP2006171600A - Projector, image projection system, and image projection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the operation of a projector from the degree of attention with which a person visually observes a projected image of the projector. <P>SOLUTION: A projector 100 includes an imaging and input part 201 for inputting a photographic image, obtained by photographing the person viewing an image projected by the projector 100; an attention degree analyzing part 202 for analyzing the degree of attention, with which the photographed person visually observes the projected image from the photographic image; an attention degree determining part 203 for determining the degree of attention of the person on the basis of an analysis result; and an operation control part 105 for controlling the operation of the projector 100 according to the determination of the degree of attention. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector, an image projection system, and an image projection method suitable for a place where people gather such as a conference hall.

A meeting method has been generalized in which presentation materials are projected by projectors and explained to participants, and discussions are conducted based on the explanations.
However, after the presentation of the presentation material was completed and the discussion was started, the brightness of the image projected from the projector and the noise generated by the projector fan hindered the progress of the conference. Therefore, the conference proceeding person moves to the standby mode in which the projection is stopped by operating the projector, or the video signal from the personal computer supplying the image to be projected is in the no signal state as described in Patent Document 1 below. The projector is shifted to the standby mode to control the lamp and fan output.

JP 2002-182304 A

  However, in the conventional method, since the video signal of the personal computer transitions to the no-signal state according to the set time, the time set by the personal computer is used to prevent the projector from switching to the standby mode during the presentation. Needed to be long enough. On the other hand, even if the meeting participants understood the projection image of the presentation material in a short time and immediately started the discussion, the projector did not enter standby mode while the time set on the PC passed . As described above, it is difficult to detect the situation of the person participating in the conference and control the operation of the projector according to the situation by the conventional method.

In order to solve the above-described problems, a projector according to the present invention is a projector that projects an image, and includes an imaging input unit that inputs a captured image obtained by capturing a person who views the projected image, and the person An attention level analysis unit that analyzes the attention level of the projected image from the captured image, an attention level determination unit that determines the attention level of the person based on the analysis result, and the attention level And an operation control unit that controls its own operation according to the determination.
According to the present invention, the attention level of the person with respect to the projected image is analyzed from the image of the person who views the image projected by the projector, the attention level is determined, and the projector is determined according to the determined attention level. To control the operation. Therefore, the projector can control the operation of the projector itself according to the degree of attention of the person to the image projected by the projector.

In this invention, it is preferable that the said operation control part controls the brightness | luminance of the said image to project.
According to the present invention, since the brightness of the projected image can be controlled according to the degree of attention of the person with respect to the projected image, the power consumption of the projector can be reduced by reducing the brightness when the person does not pay attention to the projected image. In addition, an increase in ambient temperature due to heat generation of the light source device can be suppressed.

In the present invention, it is preferable that the projector further includes a cooling unit that cools the inside of the projector, and the operation control unit controls the strength that the cooling unit cools.
According to the present invention, since the cooling unit can control the cooling intensity based on the degree of attention of the person to the projected image, the power consumption of the projector is reduced by reducing the cooling intensity when the person does not pay attention to the projection image. In addition to being able to do so, it is possible to reduce noise and vibration generated by cooling in the cooling section.

In the present invention, it is preferable that a sound generation unit that generates sound based on preset sound data is further provided, and the sound generation unit is controlled by the degree of attention.
According to this invention, the sound generation unit can generate sound such as sound effects, for example, according to the degree of attention of the person to the projected image.

In the present invention, the photographed image may be an image obtained by replacing the surface temperature of the subject to be photographed with a change in color tone or shading.
According to the present invention, it is possible to acquire the degree of attention of a person with respect to a projected image regardless of the brightness around the person.

In the present invention, the attention level analysis unit analyzes the attention level based on direction information indicating a state of whether or not the face of the person faces the projected image and a duration of the state. Also good.
In the present invention, the attention level analysis unit may analyze the attention level of the target person based on information about whether or not the target person is the target of the attention level analysis.
Furthermore, in the present invention, a projection image switching detection unit that detects switching of the projected image, and a projection image switching end determination unit that determines the end of switching of the image based on the time elapsed since the detection. It is preferable that the attention level analysis unit starts the analysis upon receiving the end determination.
According to the present invention, since a predetermined waiting time is provided for switching images, the degree of attention can be efficiently analyzed.

In order to solve the above-described problems, an image projection system of the present invention is an image projection system including a projector that projects an image, a host computer, and an imaging device, and the imaging device detects a person who views the image. The host computer includes an imaging unit that shoots and generates a captured image, and the host computer analyzes a degree of attention that the person pays attention to the projected image from the captured image, and a result of the analysis An attention level determination unit that determines the level of attention of the person, and the projector includes an operation control unit that controls its own operation according to the determination of the level of attention.
In order to solve the above problems, an image projection system of the present invention is an image projection system including a projector that projects an image and an imaging device, and the imaging device photographs a person who views the image. An imaging unit that generates a captured image, an attention level analysis unit that analyzes the degree of attention that the person focuses on the projected image, and an attention level of the person based on the result of the analysis An image projection system comprising: an attention level determination unit for determining; and the projector includes an operation control unit that controls its own operation in accordance with the determination of the attention level.
In order to solve the above-described problem, an image projecting method of the present invention is an image projecting method by a projector, and a captured image acquiring step of acquiring a captured image taken by a person viewing the image projected by the projector; , An attention level analysis step of analyzing the attention level of the person who focuses on the projected image from the captured image; and an attention level determination step of determining the attention level of the person based on the analysis result; And a control step of controlling the projector according to the determination of the attention level.
The image projection system and the image projection method described above can enjoy the same operations and effects as the projector described above.

Hereinafter, the present invention will be described with reference to the drawings. 1 to 9 are diagrams showing embodiments of a projector, an image projection system, and an image projection method according to the present invention.
Example 1

FIG. 1 is an overview diagram illustrating the configuration of the image projection system according to the first embodiment.
The image projection system includes a personal computer 200, a projector 100, and a camera 130.
The personal computer 200 is a host computer that stores an image to be projected onto the projector 100 and performs processing operations of the image projection system. The projector 100 enlarges and projects the image input from the personal computer 200 on the screen 120. The camera 130 includes an imaging unit, is installed above the vicinity of the screen 120, and photographs a person (A to F) who views the image projected on the screen 120.
In the first embodiment, it is assumed that the image projection system is installed in a conference room and used in a conference. Therefore, the persons (A to F) viewing the projected image are conference participants.
The conference is held in a state where conference participants surround three sides except for one side where the screen 120 is installed, with the conference desk 150 where the projector 100 and the personal computer 200 are installed as the center. In a meeting using an image projection system, there are roughly divided a presentation process and an agenda review process. In other words, the presentation process is a process in which the conference participants A to F face the screen 120 and pay attention to the image projected on the projector 100 and receive an explanation from the explainer. In this step, the conference participants face each other and examine the agenda without looking at the projection image on the screen 120. In addition, these two steps may be repeated alternately depending on the conference.

Although the details of this image projection system will be described later, the camera 130 captures images of the faces and heads of the conference participants, the personal computer 200 analyzes the captured images, and the degree of attention to the projected images of the entire conference participants And the operation of the projector 100 is controlled to a standby state. Here, the standby state includes an operation of reducing the brightness of the screen projected by the projector 100 or reducing the cooling strength of the cooling unit that cools the inside of the projector 100.
Further, although a connection method from the camera 130 to the personal computer 200 is not illustrated, a wired connection using a cable or a wireless system using radio or light may be used. Further, the camera 130 may be installed separately from the screen 120 or may be configured to be integrated with the screen 120.
In addition, the installation position of the camera 130 is not limited to the upper part in the vicinity of the screen 120, and may be a position around the screen 120, a position in the screen 120, and a transparent image from the back side.
The detection method of the camera 130 is desirably optically high sensitivity, and is not limited to a method of photographing with visible light, but a camera that outputs an image that replaces the surface temperature of the subject to be photographed with a change in color tone or shade. For example, an infrared camera may be used. As a result, even when the projection is performed with the illumination turned off, the conference participants can be more reliably photographed.

FIG. 2 is a block diagram showing a functional configuration of the image projection system.
The projector 100 includes a light source (lamp) 101, a lens and an optical modulation unit 102 that enlarges and projects an image on a screen 120, and performs a projection process so that the optical modulation unit 102 can input an image and project it. The projection processing unit 103 includes a fan 104 that is a cooling unit that cools the inside of the projector 100, and an operation control unit 105 that controls overall operations such as power control of the lamp 101 and rotation speed control of the fan 104. . The operation control unit 105 is operated by an operation unit 140 having a key input and a remote control function.
The projector 100 includes a CPU (not shown) and a ROM and a RAM having a memory function, and the hardware and the program stored in the memory cooperate with each other to control the operation. Control of the unit 105 and arithmetic processing such as the projection processing unit 103 are executed.

  The personal computer 200 includes an imaging input unit 201, an attention level analysis unit 202, an attention level determination unit 203, a sound generation unit 204, a control I / F (interface) unit 205, a data storage unit 206, and an image processing unit. 207, an image output unit 208, a PC input unit 209, and a display control unit 210. Here, the imaging input unit 201 inputs an imaging signal of the camera 130 and performs preprocessing. The data storage unit 206 stores an image to be projected. Further, the image processing unit 207 performs image processing on the image data in the data storage unit 206 so as to be compatible with the projector 100. The image output unit 208 outputs the image data processed by the image processing unit 207 to the projector 100. Further, information and input data operated from the keyboard 220 and the mouse 221 which are input devices connectable to the personal computer 200 are transmitted to the display control unit 210 via the PC input unit 209, and the display control unit 210 receives information and information. The data is interpreted and a predetermined operation is performed. The sound generation unit 204 includes sound data and a speaker, and generates sound based on the determination result of the attention level determination unit 203. The control I / F unit 205 is connected to the operation control unit 105 of the projector 100 and the power controller 230 via a USB or the like, and generates sound or controls external devices according to the determination result of the attention level determination unit 203. To do. The functions of the attention level analysis unit 202 and the attention level determination unit 203 will be described later.

The personal computer 200 includes a CPU (not shown) and a ROM and a RAM having a memory function, and these hardware and a program stored in the memory cooperate with each other in an organic manner. Is realized.
As described above, in the image projection system according to the present embodiment, the personal computer 200 analyzes and determines the attention level of the conference participant on the projection image from the captured image captured by the camera 130, and the operation control unit 105 of the projector 100 is controlled. The brightness control of the lamp 101 of the projector 100 and the rotational speed of the fan 104 are controlled via the control unit.
It is also possible to output a signal of interest level determination result to the outside via the control I / F unit 205 of the personal computer 200 and control the power controller 230 to operate a device using the power line as power. As a specific example, in the case of the agenda review process, it is possible to automatically return the illumination of the conference room that has been darkened for projection to a bright state.

Next, FIG. 3 is a flowchart showing processing of the attention level analysis unit 202. The attention degree analysis process is a process from extracting the orientation of the meeting participant's face and analyzing whether or not the orientation is paying attention to the projected image projected on the screen 120. The attention level analysis step up to step S310 is analyzed, and the attention level analysis result for each conference participant is recorded in the participant analysis table after step S312.
The attention degree analysis process is a process of photographing a conference participant and analyzing the attention degree. When the attention degree analysis is executed in a program stored in the personal computer 200, the process first proceeds to step S300. .
Step S300 is a captured image acquisition step, in which the camera 130 starts capturing a conference participant, and the signal processed by the imaging input unit 201 is sent to the attention level analysis unit 202 as image data of a still image. The process proceeds to step S302.
In step S302, the image data of the conference participant is analyzed, a face image is extracted for each conference participant, and the process proceeds to step S304. Here, as a method for extracting a face image from image data, for example, a technique disclosed in Japanese Patent Laid-Open No. 9-81732, that is, a mesh area of three or more points is contracted and deformed by referring to a probability density function. Thus, a technique for extracting a face region can be employed.
In step S304, a face outline is extracted from the face image, and the process proceeds to step S306. Here, as a method for extracting a face outline from a face image, for example, a technique disclosed in Japanese Patent Laid-Open No. 6-187455, that is, a technique for detecting and extracting a skin color region by luminance or color difference can be adopted. .

In step S306, the eye position is detected from the face image, the relative position of the two eyes with respect to the face outline obtained in step S304 is calculated, and the process proceeds to step S308. Here, as a method of extracting the eyes, for example, the technique disclosed in Japanese Patent Laid-Open No. 10-63850, that is, the eyes are detected by extracting edges whose brightness calculated in the vertical direction of the face changes sharply. Technology, can be adopted.
In step S308, the seat position of the conference desk of the conference participant is obtained from the entire image previously captured in step S300, and the relative position between the face and eyes in step 306 is corrected based on the seat position. For example, since a conference participant sitting to the right toward the screen 120 is tilted to the right, the perspective relationship between the seat position where the conference participant is sitting and the screen 120 is taken into consideration. The face image is corrected rightward by a predetermined amount to correct the front image.
Furthermore, since all the participants in the conference are in an attitude of looking at the screen 120 upward, the face image is corrected downward by a predetermined amount, and the correction is performed so as to obtain a more frontal image. In this way, when it can be assumed that the conference participant is looking at the projection image, the relative position between the face contour and the eyes can be treated as a front image. When the process of step S308 is completed, the process proceeds to step S310.
In step S310, using the above-described analysis result of the face image for which the relative position between the face contour and the eyes is obtained, the eye position is set to a predetermined allowable value in the horizontal direction and the vertical direction with respect to the center position predicted in the front image. Whether it is within the range or not is determined, and if it is determined that it is within the allowable range (YES), the process proceeds to step S312. On the other hand, if it is determined in step S310 that it is not within the allowable range (NO), the process proceeds to step S314.

Here, a statistical value can be used for the vertical position of the eye with respect to the face contour predicted in the front image, but if a reference image that actually captured the conference participants is used, , Individual differences can be eliminated. In order to obtain a reference image, it is only necessary to take a picture of a posture in which a conference participant sits in a predetermined seat and sees a projected image before the start of the conference.
In step S312, the data of the conference participant who has performed the analysis is recorded as 0 in the participant analysis table, and the process proceeds to step S316.
Further, in step S314, the data of the conference participant who performed the analysis is recorded as 1 in the participant analysis table, and the process proceeds to step S316.
In step S316, it is determined whether or not the attention level analysis of all the participants in the conference is completed and recorded in the participant analysis table. If it is determined that the attention level analysis result of all the participants is recorded (YES). Then, a series of processing is completed.
On the other hand, if it is not determined in step S316 that the attention level analysis result of all the participants has been recorded (NO), the process returns to step S302 to perform the attention level analysis of the remaining conference participants.
In this way, when step S316 is finished, a series of processing is finished and the original processing is restored. In the series of processes described above, the process of step 300 is started every time a conference participant is sampled, and the result of the participant analysis table is added.
Here, FIG. 4 shows a participant analysis table applied to the present embodiment. This participant analysis table is newly generated every time the attention level analysis of FIG. 3 is performed for each sampling, and the attention level analysis flag indicates the attention level of the entire conference participant at the time of sampling. The result of the overall analysis in FIG. 4 indicates that when the attention level analysis flag is 1, all the conference participants are not paying attention to the projected image.

In FIG. 4, horizontal directions, that is, A to F represent conference participants, and data of each conference participant enters in the vertical direction. That is, the “setting weight” in the upper row is a data column for setting information as to whether or not to analyze the attention level of each participant for each participant. This “setting weight” is input and set before the start of the conference. If the data is 1, the attention level analysis is performed, and if the data is 0, the attention level analysis is not performed. In FIG. 4, E and F of the conference participants are not subject to the attention level analysis, and the weighted result of the participant analysis table is set to 1 unconditionally. Therefore, participants such as conference attendees and observers can be excluded from the attention level analysis, so the processing of the attention level analysis is further reduced and the number of subjects to be analyzed is reduced, so that the overall judgment accuracy is improved. It is higher.
The “analysis result” in the lower part of the “setting weight” is a record of the result of the attention level analysis described with reference to FIG. 3. If the data is 1, it indicates that the attention is not received.
Furthermore, the “weighted result” in the lower row is a logical product of the respective “analysis result” value and the “set weight” value, which is 1 for all the conference participants. As the “whole analysis” at the bottom of the participant analysis table, the attention level analysis flag is 1.
Here, since it is not necessary for the conference participant whose “setting weight” is 0 to analyze the attention level, a series of attention level analysis processing for the conference participant can be omitted. Further, the participant analysis table generated for each sampling need not store all the data in the table, and only the attention level analysis flag may be left.

FIG. 5 is a flowchart illustrating processing for detecting stoppage of screen switching applied to the first embodiment. The attention level analysis process is performed for each sampling as described above. However, since it is inefficient to sample unconditionally, sampling is performed when it is determined that the switching of the projection image is stopped as shown below. To start.
When the screen switching stop detection process is executed in a program stored in the personal computer 200, the process first proceeds to step S500.
In step S500, a screen switching timer, which is a timer used for screen switching stop detection processing, is initially reset, and then the process proceeds to step S502.
In step S502, a screen switching stop flag indicating a screen switching stop detection result is reset to 0, and then the process proceeds to step S504.
In step S504, the screen switching timer is reset to 0 and a restart operation for starting the timer timing operation is performed, and then the process proceeds to step S506.
In step S506, it is determined whether or not the projection image output from the image processing unit 207 has been switched by the processing of the personal computer 200. If it is determined that the projection image has been switched (YES), the process returns to step S504. If the screen switching timer is restarted again, and it is determined that the projection image is not switched (NO), the process proceeds to step S508. Steps S500 to S506 described above are processes performed by the projection image switching detection unit (not shown).

In step S508, it is determined whether or not the screen switching timer performing the timing operation has reached a predetermined value. If it is determined that the screen switching timer has reached the predetermined value (YES), the process proceeds to step S510.
On the other hand, if it is determined that the predetermined value has not been reached (NO), the process returns to step S506 to detect the screen switching of the projected image.
In step S510, the screen switching flag is set to 1 and the process ends. In this way, the screen switching of the projected image is detected, the series of processing is terminated, and the original processing is restored. Steps S508 to S510 described above are processes performed by the projection image switching end determination unit (not shown).

FIG. 6 is a flowchart of the attention level determination step processed by the attention level determination unit 203. The attention level determination process is a process of determining the attention level using a series of time-series results of the participant analysis table. When the attention level determination process is executed in a program stored in the personal computer 200, first, the process proceeds to step S600. It is supposed to migrate.
In step S600, a determination timer, which is a timer used for attention degree determination processing, is initially reset, and then the process proceeds to step S604.
In step S604, the attention level determination flag indicating the determination result of the attention level determination is reset to 0, and then the process proceeds to step S606.
In step S606, the result of the participant analysis table in which the result of the attention degree analysis of the conference participant is recorded every predetermined time is read. If the predetermined time interval is set longer, the number of participant analysis tables that are read out will be many in time series, and if the predetermined time interval is set shorter, the results of the participant analysis table will be read out in time series. Less. After reading the participant analysis table in step S606, the process proceeds to step S608.

In step S608, a time series result within a predetermined time of the participant analysis flag of the read participant analysis table is determined. It is determined whether the attention level analysis flags are all 1 or not. If it is determined that all are 1 (YES), the process proceeds to step S610.
On the other hand, if it is determined that the attention level analysis flag includes 0 and all are not 1 (NO), the process proceeds to step S614. In step S614, after the determination timer is restarted, the process returns to step S606, and the participant analysis table is read again.
In step S610, it is determined whether or not the determination timer has reached a predetermined value. If it is determined that the determination timer has reached the predetermined value (YES), the process proceeds to step S612. That is, the direction information indicating whether or not the person's face is facing a predetermined direction is maintained for a predetermined duration. On the other hand, if it is determined that the determination timer has not reached the predetermined value (NO), the process returns to step S606, and the participant analysis table is read again.
In step S612, the attention level determination flag is set to 1, the series of processes is terminated, and the process returns to the original process.

FIG. 7 is a flowchart illustrating processing of a control step for controlling the projector 100 applied to the first embodiment. The projector control process is a process for controlling the projector 100 using the attention degree determination flag data input from the personal computer 200 to the operation control unit 105. When the projector control process is executed in a program stored in the projector 100, First, the process proceeds to step S700.
In step S700, the attention level determination flag is read, and the process proceeds to step S702.
In step S702, it is determined whether or not the read attention level determination flag is 1. If the attention level determination flag is determined to be 1 (YES), the process proceeds to step S704.
On the other hand, if it is determined that the attention level determination flag is not 1 (NO), the process returns to step S700 to recheck the attention level determination flag.
In step S704, the lamp 101 of the projector 100 is controlled to reduce the brightness of the projected image, and the process proceeds to step S706.
In step S706, the fan 104 of the projector 100 is controlled to reduce the rotational speed, and the process proceeds to step S708.
In step S708, it is determined whether or not a projection instruction to the projector 100 has been issued again.
Here, the reprojection instruction includes a case where the personal computer 200 instructs the operation control unit 105 of the projector 100 by operating the keyboard 220 or the mouse 221 in addition to the instruction of the operation unit 140 of the projector 100.

If it is determined in step S708 that a reprojection instruction has been issued (YES), the process proceeds to step S710. If it is determined that a reprojection instruction has not been issued (NO), the determination in step S708 is repeated to perform reprojection. Wait for the indication to be detected.
In step S710, the lamp 101 of the projector 100 is controlled to return to the luminance for performing normal projection, and the process proceeds to step S712. In step S712, the rotational speed of the fan 104 is returned to the rotational speed at which normal projection is performed, and a series of processing is terminated and the original processing is restored.
Next, the operation of the image projection system will be described. First, the conference organizer sets a “setting weight” for each conference participant in the personal computer 200 before the conference starts, and the camera 130 captures the conference participants before preparing the explanatory material. Is started so that the projector 100 projects the image onto the screen 120.

When the explanatory material is projected on the screen 120, the attention level analysis unit 202 analyzes the captured image of the conference participant captured by the camera 130 through step S316 and records it in the attention level analysis table (FIG. 4). . In the attention level determination unit 203, the attention level analysis flag of the attention level analysis table is determined through step S612, and the determination result of the attention level is obtained.
Next, when the explanation of the explanatory material using the projection image is completed, the conference participant shifts to the agenda review process between the conference participants without paying attention to the projection image.
The attention level determination unit 203 determines that the conference participant has stopped paying attention to the projection image, and outputs a determination result to the projector 100. The projector 100 receives the determination result of the attention level determination unit 203 and decreases the brightness of the projector or the rotation speed of the fan 104.

According to the first embodiment as described above, there are the following effects.
(1) A transition from a presentation process in which a conference participant watches the projection image or an intermediate state in which the conference participant reconfirms the projection image together with a discussion to a discussion proceeding process that is discussed without looking at the projection image. Therefore, the projector 100 can be controlled in a state suitable for each process.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG. In the following description, parts that are the same as those already described are given the same reference numerals and description thereof is omitted. FIG. 8 is a block diagram showing the configuration of the image projection system of the second embodiment. In the first embodiment, the attention level analysis unit 202 and the attention level determination unit 203 are provided on the personal computer 200 side. However, in the second embodiment, the attention level analysis unit 302 and the attention level determination unit 303 include the camera 130. Is provided on the imaging device 300 side.
The imaging apparatus 300 includes an imaging input unit 301, an attention level analysis unit 302, an attention level determination unit 303, and a transmission unit 304 that outputs a determination result of the attention level determination unit 303 to the personal computer 200 or the projector 100. Here, the functions of the attention level analysis unit 302 and the attention level determination unit 303 are substantially the same as the functions of the attention level analysis unit 202 and the attention level determination unit 203 described in the first embodiment. Description is omitted.
The imaging apparatus 300 is not limited to the configuration in which the camera 130 is included in the same casing, and may be in a configuration in which the camera 130 is not included in the casing of the imaging apparatus 300. Furthermore, the imaging apparatus 300 includes a CPU (not shown) as hardware, ROM and RAM as memories, and executes arithmetic processing from the imaging input unit 301 to the transmission unit 304 by a program stored in the memory.
With the above configuration, the attention level analysis process and the attention level determination process described in the first embodiment can be executed by the imaging apparatus 300.

  The transmission unit 304 includes an interface such as a USB, outputs a result of attention level determination to the personal computer 200, controls the sound generation unit 204 of the personal computer 200, and controls the projector 100 via the control I / F unit 205. Can be controlled. Further, by sending the “setting weight” information input from the keyboard 220 of the personal computer 200 to the transmission unit 304, the weight information of the participant analysis table can also be set.

According to the second embodiment as described above, in addition to the effect (1) described in the first embodiment, the following effects can be obtained.
(2) Since the main arithmetic processing of the conference system is integrally configured as the dedicated imaging device 300, the dedicated processing circuit can be configured by hardware to speed up the arithmetic processing of the conference system. Processing load can also be reduced.
(3) Since it is not necessary to install the conference system software on the personal computer 200, the personal computer used in the conference is not limited.

(Example 3)
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 9 is a block diagram illustrating a configuration of the projector 400 according to the third embodiment. In the first embodiment, the imaging input unit 201, the attention level analysis unit 202, the attention level determination unit 203, the sound generation unit 204, the data storage unit 206, and the image processing unit 207 are provided on the personal computer 200 side. In the third embodiment, in addition to the functions provided on the projector 100 side in the first embodiment, the imaging input unit 401, the attention level analysis unit 402, the attention level determination unit 403, the sound generation unit 404, the data storage unit 406, and The image processing unit 407 is provided on the projector 400 side. The functions of the imaging input unit 401, the attention level analysis unit 402, the attention level determination unit 403, the sound generation unit 404, the data storage unit 406, and the image processing unit 407 are the same as the imaging input unit 201 and the attention level described in the first embodiment. Since the analysis unit 202, the attention level determination unit 203, the sound generation unit 204, the data storage unit 206, and the image processing unit 207 are substantially the same, description of these functions is omitted.
The data input unit 405 inputs an image signal from an image output device 450 such as a DVD player, for example. The input image signal is stored in the data storage unit 406. The operation unit 440 can also operate the attention level analysis unit 402 in addition to the operation control unit 105.

The projector 400 includes a CPU (not shown) as hardware and ROM and RAM as memories, and these hardware and a program stored in the memory cooperate in an organic manner. Each of the functions described above is realized.
According to the third embodiment as described above, in addition to the effect (1) described in the first embodiment, the following effects can be obtained.
(4) Since the attention level is analyzed and determined by the projector 400 alone, the personal computer 200 is not necessary, and it is easy to move the conference hall and prepare for the conference.
(5) Since the operation unit 440 can operate the attention level analysis unit 402, for example, data of a participant analysis table such as “setting weight” can be directly input.

The present invention has been described above based on the illustrated embodiment. However, the present invention is not limited to this, and modifications described below can be assumed.
(1) In the first and third embodiments, the number of cameras 130 is set as one. However, the number of cameras 130 is not limited to this. May be.
(2) In the first and third embodiments, the calculation for obtaining the determination result from the “setting weight” and the “analysis result” in the participant analysis table and the calculation processing for obtaining the attention level determination flag are performed in the attention level analysis. Although described as processing, it may be included in the attention degree determination processing.
(3) In the first embodiment, the calculation processing of attention level analysis and attention level determination is configured to be performed by the personal computer 200 that handles projection images, but is not limited to this, and is connected by a communication line. It can also be configured to perform arithmetic processing on another computer such as a server.
(4) In the first and third embodiments, the flowcharts of FIGS. 3 and 5 to 7 are not limited to the case where the control program stored in advance in the ROM is executed. The program may be read from the storage medium storing the program into the RAM and executed. Here, the storage medium is a semiconductor storage medium such as RAM or ROM, a magnetic storage type storage medium such as FD or HD, an optical reading type storage medium such as CD or DVD, or a magnetic storage type / optical reading such as MO. Regardless of the reading method such as electronic, magnetic, optical, etc., any type of storage medium can be used as long as it is a computer-readable storage medium.

1 is a schematic view showing an image projection system according to Embodiment 1 of the present invention. 1 is a block diagram illustrating a functional configuration of an image projection system according to Embodiment 1. FIG. 5 is a flowchart illustrating attention degree analysis processing according to the first embodiment. The participant analysis table | surface which concerns on Example 1. FIG. 5 is a flowchart illustrating processing for detecting stoppage of screen switching according to the first embodiment. 5 is a flowchart illustrating attention level determination processing according to the first embodiment. 5 is a flowchart illustrating projector control processing according to the first embodiment. FIG. 9 is a block diagram illustrating a functional configuration of an image projection system according to a second embodiment. FIG. 10 is a block diagram illustrating a functional configuration of a projector according to a third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100,400 ... Projector, 101 ... Lamp (light source), 102 ... Optical modulation part, 103 ... Projection processing part, 104 ... Fan, 105 ... Operation control part, 120 ... Screen, 130 ... Camera, 140, 440 ... Operation part, 150 ... Conference desk, 200 ... Personal computer, 201, 301, 401 ... Imaging input unit, 202, 302, 402 ... Attention level analysis unit, 203, 303, 403 ... Attention level determination unit, 204, 404 ... Sound generation unit, 205 Control I / F unit 206, 406 Data storage unit 207 407 Image processing unit 208 Image output unit 209 PC input unit 210 Display control unit 220 Keyboard 221 Mouse 230 DESCRIPTION OF SYMBOLS ... Power controller, 300 ... Imaging apparatus, 304 ... Transmission part, 405 ... Data input part, 450 ... Image output apparatus, AF ... Meeting participant.

Claims (11)

A projector for projecting an image,
An imaging input unit for inputting a captured image of a person who views the projected image;
An attention level analysis unit that analyzes the attention level at which the person focuses on the projected image from the captured image;
An attention level determination unit that determines the attention level of the person based on the analysis result;
A projector comprising: an operation control unit that controls its own operation according to the determination of the attention level. The projector according to claim 1, wherein
The operation control unit controls brightness of the projected image. The projector according to claim 1 or 2,
A cooling unit for cooling the inside of the projector;
The projector according to claim 1, wherein the operation control unit controls an intensity of cooling by the cooling unit. The projector according to any one of claims 1 to 3,
A sound generator that generates sound based on preset sound data;
The projector is characterized in that the sound generation unit is controlled by the degree of attention. The projector according to any one of claims 1 to 4,
The projector is characterized in that the photographed image is an image obtained by replacing the surface temperature of the subject to be photographed with a change in color tone or shading. The projector according to any one of claims 1 to 5,
The attention level analysis unit analyzes the attention level based on direction information indicating a state of whether or not the person's face is facing the projected image and a duration of the state. projector. The projector according to any one of claims 1 to 6,
The attention level analysis unit
Based on the information on whether or not the person is the subject of the attention degree analysis,
A projector that analyzes the degree of attention of a person who is the object. The projector according to any one of claims 1 to 7,
A projected image switching detection unit for detecting switching of the projected image;
A projection image switching end determination unit that determines the end of switching of the image based on the time elapsed since the detection;
The degree-of-attention analysis unit starts the analysis upon receiving the end determination. An image projection system including a projector that projects an image, a host computer, and an imaging device,
The imaging device
An imaging unit that shoots a person who views the image and generates a captured image;
The host computer
An attention level analysis unit that analyzes the attention level at which the person focuses on the projected image from the captured image;
An attention level determination unit that determines the level of attention of the person based on the result of the analysis,
The projector is
An image projection system comprising: an operation control unit that controls its own operation in accordance with the determination of the attention level. An image projection system including a projector for projecting an image and an imaging device,
The imaging device
An imaging unit that shoots a person who views the image and generates a captured image;
An attention level analysis unit that analyzes the attention level at which the person focuses on the projected image from the captured image;
An attention level determination unit that determines the level of attention of the person based on the result of the analysis,
The projector is
An image projection system comprising: an operation control unit that controls its own operation in accordance with the determination of the degree of attention. An image projection method using a projector,
A captured image acquisition step of acquiring a captured image of a person who views the image projected by the projector;
Attention level analysis step of analyzing the attention level at which the person focuses on the projected image from the captured image;
Attention level determination step for determining the attention level of the person based on the result of the analysis;
And a control step of controlling the projector according to the determination of the attention level.

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