JP2014002940A - Lighting control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement more appropriate dimmer control of lighting devices.SOLUTION: A lighting control device 20 performs dimmer control of a plurality of lighting devices 8 installed to light an area of lighting. A camera 2 images the area of lighting. Detection means 202 uses images captured by the camera 2 to detect a point in the area of lighting where a person may be present. Scoring means 204 gives a person detection score to the detection point detected by the detection means 202. Location means 206 locates a person presence point where a person is present on the basis of the value of the person detection score of each point in the area of lighting. Lighting control means 208 performs dimmer control of each individual lighting device 8 on the basis of the result of location by the location means 206. The scoring means 204 gives the person detection score to the detection point in a value based on a distance between the camera 2 and the detection point.

Description

  The present invention relates to an illumination control apparatus that controls lighting / extinction of an illumination apparatus.

  Conventionally, sensors such as a human sensor and an illuminance sensor, a timer, and the like are used to control a lighting device that illuminates a room or the like. Specifically, for example, depending on the presence or absence of a person in the illumination target area detected by the human sensor, the illuminance of the illumination target area detected by the illuminance sensor, the time detected by the timer, etc. The lights are turned off and the illuminance is changed (hereinafter referred to as “light control”).

  In recent years, a technique for performing light control of an illumination device using an image taken by a camera is known. For example, Patent Document 1 discloses a technique for calculating the number of persons existing in a predetermined space and performing dimming of illumination based on the number. Japanese Patent Application Laid-Open No. 2003-228561 discloses a technique for performing illuminance measurement from an image photographed by a camera and adjusting the light so that the area has a necessary illuminance when the presence of a person is confirmed in the photographing area.

JP 2006-270865 A JP2011-081982A

  However, the technique according to Patent Document 1 performs overall light control including a region where no person is present. That is, in the technique according to Patent Document 1, for example, when a person is concentrated in a part of the space, the lighting device in a place away from the person is also turned on. There is a problem of lighting up.

  In addition, the technique according to Patent Document 2 performs overall light control regardless of the position of the person when the presence of the person is confirmed. There is also a problem of lighting up.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to more appropriately control the light control of the lighting device.

In order to solve the above-described problem, an illumination control apparatus according to the present invention uses a camera that captures an illumination target area and a captured image of the camera, and the person within the illumination target area where there is a possibility that a person exists. On the basis of the value of the person detection score at each point in the illumination target area, detection means for detecting a point, score giving means for giving a person detection score to the detection point detected by the detection means, Illumination control for controlling a dimming of each of a plurality of illumination devices provided to illuminate the illumination target area based on a specifying unit for specifying a person location where the person exists and a specifying result by the specifying unit Means for providing the person detection score with a value based on a distance between the camera and the detection point to the detection point. And butterflies.
Other means will be described later.

  ADVANTAGE OF THE INVENTION According to this invention, control of the light control of an illuminating device can be performed more appropriately.

It is explanatory drawing which shows the structure of the illumination system concerning Embodiment 1. FIG. It is a block diagram which shows the functional structure of the illumination system concerning Embodiment 1. FIG. It is explanatory drawing of the person detection method by a detection means. It is explanatory drawing of the person detection score provision method by a score provision means. 3 is a flowchart showing a procedure of illumination control processing according to the first exemplary embodiment; 10 is a flowchart illustrating a procedure of illumination control processing according to the second embodiment. It is a block diagram which shows the functional structure of the illumination system concerning Embodiment 3. 12 is a flowchart illustrating a procedure of illumination control processing according to the third embodiment. 10 is an explanatory diagram of a method for determining the presence or absence of a person in Embodiment 4. FIG. 14 is a flowchart illustrating a procedure of illumination control processing according to the fourth embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings (refer to other than the drawings as appropriate).

(Embodiment 1)
FIG. 1 is an explanatory diagram of a configuration of the illumination system according to the first embodiment. The lighting system 10 includes a plurality of lighting devices 8a1 (indicated as “8a ₁ ” in FIG. 1; the same applies to others) to 8n3 (hereinafter, a plurality of lighting devices 8a1 to 8n3 are collectively referred to). Is represented as a lighting device 8), and includes a plurality of cameras 2 a to 2 d, an arithmetic device 4 a, an image analysis device 5, and a control device 6.

  A large number of desks 11 and chairs 12 (seats) are arranged in the office room 30 so that a large number of persons can work. Each seat may be provided with an electronic device such as a personal computer. Doors 13a and 13b are provided at the entrance of the office room 30, and human sensors 14a and 14b for detecting persons entering and leaving the room are provided in the vicinity of the doors 13a and 13b. The human sensors 14 a and 14 b are connected to the control device 6 by a signal cable 21.

  Specifically, the lighting device 8 is, for example, a fluorescent lamp, and a plurality of lighting devices 8 are provided on the ceiling surface of the office room 30 in order to illuminate a predetermined illumination target region (the office room 30 in the present embodiment). . Each lighting device 8 has a local part of the lighting target area (office room 30) as a lighting target, and is arranged so that the whole lighting target area (office room 30) can be illuminated by the plurality of lighting devices 8a1 to 8n3. ing. In the present embodiment, lighting devices 8a1 to 8n3 are regularly arranged in three rows in the short side direction and n rows in the long side direction of office room 30, respectively.

  Cameras 2a to 2d (hereinafter, a plurality of cameras 2a to 2d are collectively referred to as camera 2) have an office room 30 that is an illumination target area as a shooting range. The cameras 2 a to 2 d are provided in the vicinity of the ceiling surface 16 c at the corners constituted by the wall surfaces 16 w 1 to 16 w 4 of the office room 30. In this embodiment, a plurality of cameras 2 are provided. However, one camera may be installed as long as the entire illumination target area can be covered as a shooting range. The respective cameras 2a to 2d are connected to each other via an imaging camera network 22. The imaging camera network 22 is connected to an image analysis device 5 provided adjacent to the office room 30.

  The image analysis device 5 is connected to the imaging camera network 22 and the arithmetic device 4a (partial illustration of wiring is omitted, the same applies hereinafter), and acquires captured images taken by the cameras 2a to 2d via the imaging camera network 22. Analyzing the captured image. The analysis result of the captured image by the image analysis device 5 is output to the arithmetic device 4a.

  The arithmetic device 4a is connected to the image analysis device 5 and the control device 6 via a signal cable 24 or the like. The arithmetic device 4a includes a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores and stores a control program, a RAM (Random Access Memory) as an operation area of the control program, and an EEP that holds various data in a rewritable manner. (Electrically Erasable Programmable) It is configured to include an interface unit for interfacing with ROM, peripheral circuits and the like. Data, command commands, and the like are input to the arithmetic device 4a via input means such as a keyboard 4b and a mouse 4c. The arithmetic device 4a is provided with display means 4d such as a display, and displays data input via the input means, output data from the arithmetic device 4a, and the like.

  The control device 6 is connected to the arithmetic device 4a via the signal cable 24. The control device 6 is connected to each of the lighting devices 8a1 to 8n3 via the lighting control cable 23, and controls dimming of each of the lighting devices 8a1 to 8n3 based on a control signal from the arithmetic device 4a. In the present embodiment, the arithmetic device 4a and the image analysis device 5 are independent devices, but these devices may be realized by a single arithmetic device or the like.

  The illumination switches 15 a and 15 b for turning on and off the illumination device 8 are connected to the control device 6.

Next, a functional configuration of the lighting system 10 will be described.
FIG. 2 is a block diagram illustrating a functional configuration of the illumination system 10 according to the first embodiment. The functional configuration of the illumination system 10 is divided into a plurality of illumination devices 8 provided for illuminating the office room 30 that is the illumination target area, and an illumination control device 20 that controls dimming of the illumination device 8.

  The illumination control device 20 includes a camera 2, a processing unit 201 including a detection unit 202, a score assignment unit 204, a specification unit 206, and an illumination control unit 208, and a storage unit 209. Each unit in the processing unit 201 performs each process in cooperation with the storage unit 209. The illumination control device 20 corresponds to the plurality of cameras 2a to 2d, the arithmetic device 4a, the image analysis device 5, and the control device 6 shown in FIG.

  The camera 2 is the plurality of cameras 2a to 2d shown in FIG. 1 and uses the office room 30 that is the illumination target area as a shooting range.

  The detection means 202 detects a spot (hereinafter referred to as “detection spot”) within the illumination target area (in the office room 30) where a person may exist, using the captured image of the camera 2. For example, the detection unit 202 compares and analyzes the pixels of the captured image of the camera 2 every predetermined time, and extracts an area having color information different from that of the captured image at the previous time (hereinafter referred to as “change area”). And the point corresponding to this change area | region is detected as a detection point with a possibility that a person exists. This is because it is considered that there is usually some movement when the person is at the place, and the change in the color information of the photographed image is considered to be caused by the movement of the person. In addition, you may make it consider the color change of the pixel accompanying the change of a weather, the change of the position of the sun, etc.

  FIG. 3 is an explanatory diagram for explaining a person detection method by the detection means 202. 3A shows a photographed image D1 of the camera 2 at time t0, and FIG. 3B shows a photographed image D2 of the camera 2 after a predetermined time has elapsed from time t0 (time t0 + α). Each captured image D1, D2 is divided into a plurality of areas, and each divided area can be specified by coordinates (x, y). For example, the upper left divided area can be specified by coordinates (x1, y1).

  When the captured images D1 and D2 are compared, no person is shown in the captured image D1, but in the captured image D2, coordinates (X3, y2), (X3, y3), (X4, y2), (X4, y3), The colors of (X5, y2), (X5, y3), (X5, y4), (X6, y1), (X6, y2), (X6, y3) (X6, y4) have changed. From this, the detection unit 202 has coordinates (X3, y2), (X3, y3), (X4, y2), (X4, y3), (X5, y2), (X5, y3), which are change areas, It is detected that there is a possibility that a person is present at a point corresponding to (X5, y4), (X6, y1), (X6, y2), (X6, y3) (X6, y4).

  Note that FIG. 3 uses a simplified diagram for easy understanding of the processing of the detection means 202, and the actual processing is performed in units of pixels. In addition, since the camera 2 is provided in the vicinity of the ceiling surface 16c, the actual captured image is a wide-angle image obtained by capturing a wider range in the office room 30 as compared to the diagram illustrated in FIG.

  Returning to the description of FIG. 2, the score assigning unit 204 assigns a person detection score to the detection point detected by the detecting unit 202. The score assigning unit 204 determines a person detection score to be given to the detection point based on the distance between the camera 2 and the detection point. More specifically, the score assigning unit 204 increases the person detection score as the distance between the camera 2 and the detection point is shorter.

  FIG. 4 is an explanatory diagram for explaining a person detection score assignment method by the score assignment unit 204. 4A is a photographed image of the camera 2, and FIG. 4B is a plan view obtained by converting a position (coordinates) on the photographed image into a plane. As shown in FIG. 4A, the captured image of the camera 2 is a bird's-eye view image of the floor surface side viewed from the ceiling surface side of the office room 30. The detection unit 202 divides the photographed image into a predetermined number and detects an area where a person may be present (area where the color has changed). In FIG. 4A, the photographed image is divided into 16 parts in the horizontal direction and 12 parts in the vertical direction, and is divided into a total of 192 areas.

  When the position of each region in FIG. 4A is coordinate-transformed on a plane, as shown in FIG. 4B, the region on the plane that is covered by one region on the captured image is wider as the area is farther from the camera 2. Become. For example, in the area where the distance from the camera 2 is the shortest in the captured image (vertical distance 1 m from the camera 2), the horizontal distance covered by one area is about 0.125 m obtained by dividing about 2 m into 16 parts. On the other hand, in the area where the distance from the camera 2 is the longest in the captured image (vertical distance to the camera 2 is 17 m), the horizontal distance covered by one area is about 1.125 m, which is obtained by dividing about 18 m into 16 parts. For this reason, the detection error increases as the location is farther from the camera 2, and the detection accuracy of the person decreases.

  Therefore, the score assigning unit 204 increases the person detection score as the distance between the camera 2 and the detection point is shorter in order to prevent a decrease in human detection accuracy. Specifically, the person detection score S at each detection point is the product of a coefficient A that decreases in proportion to the distance between the detection point and the camera 2 and a reference score (for example, “1”) (person detection score). S = coefficient A × reference score). That is, the score assignment unit 204 weights each detection point based on the distance from the camera 2.

  In the present embodiment, the coefficient A is changed linearly with respect to the distance from the camera 2. In this case, the coefficient A can be expressed as a linear function of the vertical distance y between the detection point and the camera 2. That is, it can be expressed as coefficient A = ay + b (a and b are constants). Specifically, for example, when the detection point is in an area where the distance to the camera 2 is the shortest (a vertical distance of 1 m from the camera 2) in the captured image, the coefficient A is “5”, and in the captured image, the camera 2 When the detection point is in the region with the longest distance (vertical distance 17m from the camera 2), when the coefficient is set to be “1”, the coefficient A at the point of an arbitrary vertical distance y is the coefficient A = It can be shown as (−y + 21) / 4.

  In FIG. 4, for the sake of convenience of explanation, only the vertical distance between the detection point and the camera 2 has been described. However, if the person detection score S is calculated in consideration of the horizontal distance between the detection point and the camera 2, the person The detection accuracy can be further improved.

  Returning to the description of FIG. 2, the specifying unit 206 specifies the person presence point where the person exists based on the value of the person detection score at each point in the illumination target area. Specifically, the specifying unit 206 specifies a point where the person detection score is a predetermined value or more as a person presence point. As described above, since a greater value is assigned to the person detection score as the distance between the camera 2 and the detection point is shorter, the point where the distance from the camera 2 is shorter is more easily identified as the person presence point.

  The illumination control unit 208 controls dimming of each illumination device 8 based on the identification result by the identification unit 206. The lighting control unit 208 turns on the lighting device 8 that targets the vicinity of the person presence point as the illumination target, and turns off the illumination device 8 that targets the area other than the vicinity of the person presence point or reduces the illuminance. For example, when the position on the ceiling surface of the lighting device 8 is projected onto the floor surface of the office room 30, the position of the projection point is determined from the person presence point. The lighting device 8 is within a predetermined distance (for example, 1 m).

FIG. 5 is a flowchart of a procedure of the illumination control process performed by the illumination control device 20 according to the first embodiment. In the flowchart of FIG. 5, the lighting control device 20 first photographs the office room 30 with the camera 2 (step S501).
Next, the detection unit 202 identifies an area (change area) where there is a motion in the captured image (step S502).

  Next, the detection unit 202 converts the captured image into plane data, specifies the position coordinate on the plane of the change area, detects it as a detection point (step S503), and stores the position coordinate of the detection point in a database (stored). Section 209) (step S504). The processing of steps S501 to S504 is hereinafter referred to as “coordinate detection processing”.

Next, the score assigning unit 204 assigns a weighted person detection score to each detection point based on the distance from the camera 2 (step S505).
Next, the specifying unit 206 specifies a point where the person detection score is a predetermined value or more, that is, a person existing point (step S506).

  Next, the lighting control unit 208 selects any one of the plurality of lighting devices 8 (step S507), and there is a person presence point in the vicinity (within a predetermined distance) of the lighting device 8 (selected lighting device). Whether or not (step S508).

  When there is a person presence point in the vicinity of the selected lighting device (step S508: Yes), the lighting control unit 208 determines whether or not the selected lighting device is lit with an illuminance of a predetermined value or more (step S509). When the selected lighting device is lit with an illuminance equal to or higher than a predetermined value (step S509: Yes), the lighting control unit 208 maintains the lighting state as it is (step S510). On the other hand, when the selected lighting device is not lit with an illuminance equal to or higher than the predetermined value (step S509: No), the lighting control unit 208 turns on the selected lighting device or increases the illuminance (step S511).

  In step S508, when there is no person presence point in the vicinity of the selected lighting device (step S508: No), the lighting control unit 208 determines whether the selected lighting device is lit with an illuminance equal to or higher than a predetermined value. (Step S512) When the light is illuminated with an illuminance equal to or higher than a predetermined value (Step S512: Yes), the light is turned off or the illuminance is reduced (Step S513). On the other hand, if the selected illumination device is not lit with an illuminance greater than or equal to the predetermined value, that is, the light is turned off or the illuminance is less than the predetermined value (step S512: No), the illumination control means 208 continues the lighting state as it is (step S514) ).

  The lighting control device 20 returns to step S507 and repeats the subsequent processing until all the lighting devices 8 provided in the office room 30 perform the processing after step S507 (step S515: No). And if the process after step S507 is performed about all the illuminating devices 8 (step S515: Yes), the process by this flowchart will be complete | finished. The processing of steps S507 to S515 is hereinafter referred to as “individual lighting control processing”. The lighting control device 20 performs the processing shown in FIG. 5 at predetermined time intervals, and performs dimming of lighting according to the position of the person in the office room 30 that changes every moment.

  As described above, when the illumination system 10 according to the first embodiment specifies the position of a person from the captured image of the camera 2, the person detection score weighted based on the distance between the camera 2 and the detection point is used. And a person presence point is specified based on the person detection score. More specifically, the score assigning unit 204 increases the person detection score as the distance between the camera 2 and the detection point is shorter. When the position of a person is specified from the captured image of the camera 2, the detection error increases as the position is farther from the camera 2, and the detection accuracy of the person decreases. By performing weighting based on the distance between the camera 2 and the detection point, it is possible to improve the detection accuracy of a person particularly in a place away from the camera 2 and to more appropriately control the light control of the lighting device 8. it can.

(Embodiment 2)
In the first embodiment, the detection accuracy of a person is improved by assigning a larger person detection score to a detection point closer to the camera 2. In the second embodiment, in addition to the distance between the camera 2 and the detection position, the detection accuracy of a person is improved by using seat position information that specifies the position of the seat in the illumination target area.

  More specifically, as shown in FIG. 1, the office room 30 that is the illumination target area is provided with a seat on which a person is seated. In the second embodiment, the specifying unit 206 has seat position information for specifying the position of the seat in the illumination target area (in the office room 30), and the person detection score is a predetermined value or more and the seat position. A point is specified as a person presence point. In the seat position information, for example, the position coordinates of the seat in the office room 30 are recorded. In addition, the structure of the illumination system 10 in Embodiment 2 is the same as that of Embodiment 1 (refer FIG. 1 and FIG. 2).

  FIG. 6 is a flowchart of a procedure of illumination control processing performed by the illumination control device 20 according to the second embodiment. In the flowchart of FIG. 6, the illumination control device 20 first performs coordinate detection processing (processing of steps S501 to S504 in FIG. 5) as in the first embodiment (step S601).

Next, the score assigning unit 204 assigns a weighted person detection score based on the distance from the camera 2 to each detection point (step S602).
Next, the specifying unit 206 specifies a point where the person detection score is equal to or greater than a predetermined value (step S603).

  Next, the specifying unit 206 collates the position coordinates of the point where the person detection score is a predetermined value or more with the position coordinates in the seat position information (step S604), and the person detection score is a predetermined value or more and the seat position. Is extracted, and this point is specified as a person presence point (step S605).

  And the illumination control apparatus 20 performs an individual illumination control process (process of step S507-S515 of FIG. 5) similarly to Embodiment 1, and complete | finishes the process by this flowchart.

  In the flowchart of FIG. 6, the specifying unit 206 collates the position coordinates of the point where the person detection score is equal to or greater than a predetermined value and the seat position coordinates, and if they match, this point is specified as the person existing point. For example, the score assigning unit 204 has seat position information, the score assigning unit 204 collates the position coordinates of the detection point with the position coordinates of the seat, and the detection point is a point where the seat is provided. In some cases, the person detection score may be made larger than when the detection point is not a point where a seat is provided.

  As described above, the lighting system according to the second embodiment specifies the person presence position using the seat position information that specifies the position of the seat in the illumination target area in addition to the distance between the camera 2 and the detection position. To do. The position where the seat is provided is considered to be a point where the probability that a person is present is particularly large even in the illumination target area. For this reason, the detection accuracy of a person can be improved more and the light control of the illuminating device 8 can be controlled more appropriately.

(Embodiment 3)
In the third embodiment, in addition to the distance from the detection position with the camera 2, the detection accuracy of a person is improved by using electronic device information that specifies the operating state and position of the electronic device in the illumination target area. More specifically, as shown in FIG. 1, an electronic device used by a person may be provided in an office room 30 that is an illumination target area. The electronic device is, for example, a personal computer. The third embodiment further includes electronic device information acquisition means for acquiring electronic device information for specifying the operating state and position of these electronic devices. Electronic device information is stored in the storage unit 209.

  FIG. 7 is a block diagram of a functional configuration of the illumination system 70 according to the third embodiment. 7, parts common to the functional configuration of the illumination system 10 according to the first embodiment shown in FIG. 2 are given the same reference numerals as those in FIG. 2, and detailed descriptions thereof are omitted. In addition to the configuration of the illumination system 10 shown in FIG. 2, the illumination system 70 shown in FIG. 7 is provided with electronic device information acquisition means 702.

  The electronic device information acquisition unit 702 acquires electronic device information that identifies the operating state and position of the electronic device provided in the office room 30. In addition, it is considered that a plurality of electronic devices (for example, the number of persons who perform business in the office room 30) are provided in the office room 30, and the electronic device information includes the operating states of all of the plurality of electronic devices. And position coordinates. Each electronic device is assigned an ID (IDentifier), and the electronic device information is associated with an ID for identifying the electronic device, an operating state, and position coordinates.

  The information specifying the operating state of the electronic device is information indicating whether each electronic device is operating, for example. The electronic device information acquisition unit 702 acquires the CPU operating rate of each electronic device via an intra-office network such as a LAN (Local Area Network), for example, and an electronic device having a CPU operating rate equal to or higher than a predetermined value is operating. It is determined that an electronic device having a CPU operating rate less than a predetermined value is not operating. Further, the information for specifying the position of the electronic device is a position coordinate of the place where the electronic device is installed in the office room 30. When the electronic device is a wireless LAN compatible laptop computer or the like, the position information of the electronic device may be acquired together with the operating state of each electronic device.

  In the lighting system 70, the specifying unit 206 acquires electronic device information from the electronic device information acquiring unit 702, and specifies a point where the person detection score is equal to or more than a predetermined value and the position of the operating electronic device as a person presence point. . That is, when the position coordinate of the point where the person detection score is equal to or greater than the predetermined value matches the position coordinate of the electronic device and the electric device is operating, the specifying unit 206 determines that the point is the person existing point. Identifies it.

  FIG. 8 is a flowchart illustrating the procedure of the illumination control process performed by the illumination control apparatus 20 according to the third embodiment. In the flowchart of FIG. 8, the illumination control device 20 first performs coordinate detection processing (processing of steps S501 to S504 in FIG. 5) as in the first embodiment (step S801).

Next, the score assigning unit 204 assigns a weighted person detection score to each detection point based on the distance from the camera 2 (step S802).
Next, the specifying unit 206 specifies a point where the person detection score is equal to or greater than a predetermined value (step S803).

Next, the electronic device information acquisition unit 702 acquires the electronic device information of the electronic device in the office room 30 (step S804).
Next, the specifying unit 206 refers to the position information in the electronic device information, and extracts the point where the electronic device is located from the position coordinates of the point where the person detection score specified in step S803 is a predetermined value or more ( Step S805).

Next, the specifying unit 206 determines whether or not the electronic device located at the extracted point is operating (step S806). When the electronic device at the extracted point is operating (step S806: Yes), the specifying unit 206 specifies this point as a person presence point (step S807).
On the other hand, when the electronic device at the extracted point is not operating (step S806: No), the specifying unit 206 determines that this point is not a person presence point, and proceeds to step S808.

  And the illumination control apparatus 20 performs an individual illumination control process (process of step S507-S515 of FIG. 5) similarly to Embodiment 1 (step S808), and complete | finishes the process by this flowchart.

  Note that the processing in steps S805 to S807 may be performed as follows. First, the operating electronic device is identified from the electronic device information, and the position coordinates of the operating electronic device are extracted. Then, a point where the position coordinates of the electronic device in operation and the position coordinates of the point where the person detection score is greater than or equal to a predetermined value may be extracted and set as the person presence point.

  In addition, instead of performing processing with reference to the electronic device information by the specifying unit 206, the score assigning unit 204 acquires the electronic device information, and the detection point is a point where an operating electronic device is installed (that is, In the case where the position coordinates of the detection point coincide with the position coordinates of the electronic device in operation), the person detection score may be made larger than that in the case where the electronic device in operation is not installed.

  As described above, the illumination system according to the third embodiment uses the electronic device information that specifies the operating state and position of the electronic device in the illumination target area in addition to the distance between the camera 2 and the detection position. Specify the location. The position where the electronic device is provided is a point where there is a particularly high probability that a person exists even in the illumination target area. Further, whether or not a person is actually present can be specified depending on whether or not the electronic device is operating. For this reason, the detection accuracy of a person can be improved more and the light control of the illuminating device 8 can be controlled more appropriately.

(Embodiment 4)
In the fourth embodiment, the person detection score to be given to the detection position is determined based on the distance from the camera 2, and the detection result of the detection unit 202 at each time from the current time to the predetermined time before the detection is detected. A person detection score having a value based on the time interval between the detection time of the result and the current time is assigned. More specifically, the smaller the time interval between the detection time of the detection result and the current time is, the larger the person detection score is, and the integrated value of the person detection score at each time from the current time to the past predetermined time is greater than or equal to the predetermined value. A point is specified as a person presence point. Since the configuration of the illumination system in the fourth embodiment is the same as that in the first embodiment (see FIGS. 1 and 2), detailed description thereof is omitted.

  FIG. 9 is an explanatory diagram showing a method for determining the presence or absence of a person in the fourth embodiment. FIGS. 9A to 9C show data at an arbitrary point (referred to as point E) in the illumination target area. FIG. 9A shows a detection result by the detection unit 202, and the vertical axis indicates whether or not there is a person at the point E (possibility that there is a person: 1, no possibility that a person exists), horizontal The axis indicates time t. FIG. 9B shows the integrated value of the person detection score at the point E given by the score assigning unit 204, and the vertical axis shows the integrated value of the person detection score up to a predetermined time before the previous time (for example, 10 minutes before). The axis indicates time t. FIG. 9C shows the identification result by the identifying unit 206. The vertical axis indicates whether or not the point E is identified as a person existence point (identified as a person existence point: 1, identified as a person existence point). Not: 0), the horizontal axis indicates time t.

  The detection means 202 reads the captured image of the camera 2 every predetermined time (for example, every 0.1 second), and continuously detects detection points. In FIG. 9A, it is determined that there is no possibility of a person at the point E from time t0 to time t1. For this reason, from time t0 to time t1, the person detection score at the point E is 0, and the integrated value of the person detection scores shown in FIG.

  Next, in FIG. 9A, it is determined that there is a possibility that there is a person intermittently from time t1 to time t3. For this reason, as shown in FIG. 9B, the integrated value of the person detection scores at the point E is greater than 0 after the time t1. Here, the score assigning means 204 is a person whose value is based on the detection time of the detection means at each time from the current time to the past predetermined time, based on the time interval between the detection time of the detection result and the current time. A detection score is given. Specifically, the person detection score is increased as the time interval between the detection time of the detection result and the current time is smaller.

  For example, if the past predetermined time is 10 minutes, the score assigning unit 204 refers to the detection results (FIG. 9A) detected by the detection unit 202 up to 10 minutes ago, and the time interval with respect to the detection results at each time. Multiply by a factor B based on The coefficient B is set to a larger value as the time interval between the current time and the detection time is smaller.

  In this embodiment, it is assumed that the time interval between the detection time of the detection result and the current time is changed linearly. In this case, the coefficient B can be expressed as a linear function of the time interval T between the detection time of the detection result and the current time. That is, it can be expressed as coefficient B = cT + d (c and d are constants). Specifically, for example, the coefficient B when the current time and the detection time are equal (the smallest time interval) is “3”, and the coefficient B when 10 minutes ago (the largest time interval) is “1”. Then, it can be expressed as a coefficient B = −0.2T + 3.

  In FIG. 9B, the integrated value of the person detection score increases after time t1, and exceeds the threshold P of the integrated value of the person detection score in the specifying unit 206 at time t2. For this reason, in the identification result by the identifying unit 206 shown in FIG. 9C, the point E is identified as a person existing point after time t2.

  On the other hand, after time t3 in FIG. 9A, there is no time at which it is determined that there is a person continuously, and the integrated value of the person detection score shown in FIG. 9B also decreases. Since it is below the threshold value in the specifying unit 206 at time t4, in the specifying result by the specifying unit 206 shown in FIG. 9C, it is specified that the point E is not a person existing point after time t4.

  As a result, when the person moves to the illumination target area where no person exists, the lighting device 8 is quickly turned on, and when a person leaves the illumination target area, a certain amount of time has passed. The lighting device 8 is turned off. As a result, flickering due to frequent lighting and extinguishing of the lighting device 8 can be prevented.

  FIG. 10 is a flowchart illustrating a procedure of the illumination control process performed by the illumination control apparatus 20 according to the fourth embodiment. In the flowchart of FIG. 10, the illumination control device 20 first performs coordinate detection processing (steps S501 to S504 in FIG. 5) as in the first embodiment (step S1001).

Next, the score assigning unit 204 assigns a person detection score that is weighted based on the distance to the camera 2 to each detection point (step S1002).
Next, the score assigning unit 204 assigns a person detection score that is weighted based on the time interval between the detection time and the current time to the detection results for the past predetermined time (step S1003).

Next, the specifying unit 206 integrates the person detection scores given to the detection results for the past predetermined time in step S803 (step S1004).
Next, the specifying unit 206 specifies a point where the integrated value of the person detection score is a predetermined value or more as a person presence point (step S1005).

  After that, the illumination control device 20 performs the individual illumination control process (the processes in steps S507 to S515 in FIG. 5) as in the first embodiment (step S1006), and ends the process according to this flowchart.

  As described above, the illumination system according to the fourth embodiment determines the person detection score to be given to the detection position based on the distance to the camera 2 and detects at each time from the current time to the past predetermined time. A person detection score having a value based on the time interval between the detection time of the detection result and the current time is assigned to the detection result of the means 202. More specifically, the smaller the time interval between the detection time of the detection result and the current time is, the larger the person detection score is, and the integrated value of the person detection score at each time from the current time to the past predetermined time is greater than or equal to the predetermined value. A point is specified as a person presence point. As a result, when the person moves to the illumination target area where no person exists, the lighting device 8 is quickly turned on, and when a person leaves the illumination target area, a certain amount of time has passed. The illumination device 8 is turned off. As a result, flickering due to frequent lighting and extinguishing of the lighting device 8 can be prevented, and the light control of the lighting device 8 can be more appropriately controlled.

2 (2a to 2d) Camera 4a Arithmetic device 4b Keyboard 4c Mouse 4d Display means 5 Image analysis device 6 Control device 8 (8a1 to 8n3) Illumination device 10, 70 Illumination system 20 Illumination control device 30 Office room 201 Processing unit 202 Detection means 204 score assigning means 206 identifying means 208 lighting control means 209 storage unit 702 electronic device information obtaining means

Claims (9)

A camera that captures the illumination area;
Detecting means for detecting a point in the illumination target area where there is a possibility that a person exists by using a photographed image of the camera;
Score giving means for giving a person detection score to the detection point detected by the detection means;
A specifying means for specifying a person presence point where the person exists based on a value of the person detection score at each point in the illumination target area;
Illumination control means for controlling dimming of each of a plurality of illumination devices provided for illuminating the illumination target area based on the identification result by the identification means,
The said score provision means provides the said person detection score of the value based on the distance of the said camera and the said detection point with respect to the said detection point, The lighting control apparatus characterized by the above-mentioned. The score giving means increases the person detection score as the distance between the camera and the detection point is shorter,
The lighting control apparatus according to claim 1, wherein the specifying unit specifies a point where the person detection score is a predetermined value or more as the person presence point. The illumination target area is provided with a seat on which the person is seated,
The specifying means uses the seat position information, which is information on the position of the seat in the illumination target area, stored in the storage unit, to determine a point where the person detection score is a predetermined value or more and the seat is provided. The lighting control device according to claim 2, wherein the lighting control device is specified as the person presence point. The lighting target area is provided with an electronic device used by the person,
Further comprising electronic device information acquisition means for acquiring operating state information of the electronic device and position information of the electronic device from a storage unit;
The specifying unit acquires the operating state information and the position information from the electronic device information acquiring unit, and determines a point where the person detection score is a predetermined value or more and the operating electronic device is provided as the person presence point The lighting control device according to claim 2, characterized by: The illumination target area is provided with a seat on which the person is seated,
When the detection point is a point where the seat is provided using the seat position information which is information on the position of the seat in the illumination target area stored in the storage unit, The lighting control device according to claim 2, wherein the person detection score is made larger than when the detection point is not a point where the seat is provided. The lighting target area is provided with an electronic device used by the person,
Further comprising electronic device information acquisition means for acquiring operating state information of the electronic device and position information of the electronic device from a storage unit;
The score granting unit acquires the electronic device information from the electronic device information acquisition unit, and in the case where the detection point is a point where the electronic device is in operation, the detection point is in operation The lighting control device according to claim 2, wherein the person detection score is made larger than that in a case where the electronic device is not provided. The detection means continuously detects the detection point every predetermined time,
The score assigning means is a person having a value based on a time interval between the detection time of the detection result and the current time with respect to the detection result of the detection means at each time from the current time to a past predetermined time in advance. A detection score,
3. The illumination according to claim 1, wherein the specifying unit specifies the person presence point using an integrated value of the person detection score at each time from the current time to the past predetermined time. Control device. The score giving means increases the person detection score as the time interval between the detection time of the detection result and the current time is smaller,
The lighting control apparatus according to claim 7, wherein the specifying unit specifies a point where an integrated value of the person detection scores is a predetermined value or more as the person presence point.   The lighting control means turns on the lighting device whose illumination target is around the person presence point, and turns off the lighting device whose illumination target is a region other than the periphery of the person presence point or reduces the illuminance. The lighting control device according to claim 1, wherein