JP2012155875A - Lighting control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting control system which can attain energy saving by reducing unnecessary power consumption.SOLUTION: The lighting control system 1 comprises a plurality of lighting fixtures 10 (10a-10i) which are set, respectively, in regions Aa-Ai. Each lighting fixture 10 is provided with an image sensor 13 which captures the image of an illumination region of the lighting fixture, and a control unit 12 which controls the lighting state of a light source 11 based on the image captured by the image sensor 13. A lighting controller 18 in the control unit 12 detects intensity change in a region where an intensity change detector 17 in the control unit 12 is contiguous to other lighting fixture 10, and sets the lighting state of the light source 11 in a first lighting state when a human body detector 16 in the control unit 12 does not detects existence of a person.

Description

  The present invention relates to an illumination control system that performs illumination according to a human detection result by a human sensor.

  Conventionally, for the purpose of power saving, a lighting control system has been provided in which a human sensor is installed in the space to detect the presence or absence of a person, and lighting fixtures are automatically turned on and off according to the output from the human sensor. Has been. In recent years, in this type of lighting control system, it has been considered to use an image sensor such as CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) to detect the presence or absence of a person from the image captured by the image sensor. Has been.

  Since this type of image sensor has a feature that it can acquire a human movement, a change in brightness, and the like with high density, for example, a detection region set in an illumination space as in the illumination system described in Patent Document 1. It has been proposed to detect a person by tracking a change in luminance caused by the above. In the illumination system described in Patent Document 1, a luminance change generated in a specific detection region set in the illumination space is tracked based on an image output from the image sensor, and the luminance generated in the detection region is detected. The lighting state of the light source is controlled based on the change. Thereby, it is possible to reduce erroneous detection of a moving object other than a person and perform highly reliable lighting control.

JP 2009-266532 A

  By the way, when illuminating a wide space such as an office using this kind of illumination control system, the presence or absence of a person in the entire wide illumination space can be determined by arranging the image sensors as described above with different detection areas. It can be detected.

  For example, in the illumination control system 100 shown in FIG. 9, the illumination area S1 is divided into 4 areas S1a to S1d of 2 × 2 in the vertical direction, and each of the areas S1a to S1d is set as an illumination area, respectively. Is placed on the ceiling. Each lighting fixture 10 (10a-10d) is provided with the image sensor 11, respectively, and each image sensor 11 is set as area | region S1a-S1d corresponding to the lighting fixture 10 as a detection area | region.

  In this lighting control system 100, when the presence of a person is detected based on a change in luminance of an image output from the image sensor 11 of any of the lighting fixtures 10 (10a to 10d), the areas S1a to S1d where the person is detected. The lighting fixture 10 corresponding to is turned on. In the illumination control system 100, a specific method for detecting a person based on a luminance change in an image from the image sensor 11 is a conventionally known technique, and detailed description thereof is omitted.

  Thus, by using a plurality of image sensors 11, it becomes possible to detect the presence or absence of a person in the entire illumination area S1, and even when lighting a wide space such as an office, the lighting control is highly reliable. Makes it possible to do.

  However, in the illumination control system 100 shown in FIG. 9, since the detection regions (regions S1a to S1d) of the image sensors 11 are adjacent to each other, for example, when the lighting fixture 10a is turned on, the region S1a is adjacent to the region S1a among the regions S1b to S1d. The part to do becomes brighter. Therefore, even in the image output by the image sensor 11 of the lighting fixtures 10b to 10d, the luminance of the adjacent portion to the region S1a is increased, and it is determined that there is a person based on this luminance change, and the lighting fixtures 10b to 10d are turned on. The areas S1b to S1d around the area S1a are illuminated. Therefore, there is a problem that unnecessary power consumption is generated by lighting the lighting fixture 10 that does not need to be turned on (in the above example, the lighting fixtures 10b to 10d).

  The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide an illumination control system capable of realizing energy saving by reducing unnecessary power consumption.

  To achieve the above object, in the lighting control system of the present application, a plurality of lighting fixtures, a human sensor for detecting the presence / absence of a person for each lighting area of the plurality of lighting fixtures, and another lighting fixture for each lighting area A luminance change detection unit that detects a luminance change in an adjacent region adjacent to the illumination region, and an illumination control unit that controls the lighting state of the lighting fixture based on the detection output from the human sensor and the luminance change detection unit, The illumination control unit is characterized by setting a lighting state of a lighting fixture in which a luminance change in an adjacent region is detected and no human presence is detected to a predetermined lighting state.

  In this illumination control system, the human sensor detects the presence or absence of a person based on a difference between an image sensor that captures an illumination area and outputs a captured image, and a captured image output from the image sensor and a preset reference image. Preferably, the luminance change detection unit detects a luminance change based on a difference between the captured image output from the image sensor and the reference image.

  Moreover, it is preferable that an illumination control means controls the lighting state of a lighting fixture according to the detected change pattern of a brightness | luminance change, and has a change pattern which a brightness | luminance change concentrates on an adjacent area as this change pattern. In addition, it is preferable that the change pattern has a change pattern in which the change in luminance is concentrated in the adjacent region and the change in luminance exists in a region wider than the predetermined region in the region adjacent to the adjacent region.

  According to the lighting control system of the present application, unnecessary power consumption can be reduced and energy saving can be realized.

It is the schematic which shows the illumination control system concerning Embodiment 1 of this application. It is a schematic block diagram which shows the lighting fixture which comprises the lighting control system. It is the schematic which shows the installation state of the lighting fixture. (A)-(c) is the schematic for demonstrating operation | movement of the illumination control system. It is the schematic for demonstrating operation | movement of the lighting fixture which comprises the lighting control system. (A) is a schematic diagram for demonstrating operation | movement of the illumination control system, (b) is a figure which shows the lighting state of each lighting fixture in that case. (A) is a schematic diagram for demonstrating operation | movement of the illumination control system, (b) is a figure which shows the lighting state of each lighting fixture in that case. Another example of the illumination control system is shown, (a) is a schematic block diagram showing its configuration, (b) is a schematic diagram showing its installation state, and (c) is a schematic block diagram showing its main part. It is. It is the schematic for demonstrating the conventional illumination control system.

  Hereinafter, embodiments of the present application will be described with reference to the drawings. The lighting control system 1 according to the present embodiment includes a plurality of lighting fixtures 10 (10a to 10i) that operate by power supplied from a commercial power source (not shown) (see FIG. 1). For example, as shown in FIG. 3, each lighting fixture 10 is disposed on a ceiling surface of an office or the like, and an area provided on the lower side is set as an illumination area. Here, in the present embodiment, as shown in FIG. 1, the lighting fixtures 10 a to 10 i are arranged in three vertical and horizontal directions so that the rectangular lighting areas (areas Aa to Ai) set to each other are adjacent to each other. They are arranged at regular intervals in a grid pattern.

  Further, as shown in FIG. 2, each lighting fixture 10 includes a light source 11 such as an LED (light emitting diode), and is turned on / off and has a dimming level according to a dimming signal from a control unit 12 described later. Adjustments are made.

  Each lighting fixture 10 includes an imaging device (not shown) such as a CMOS (Complementary Metal Oxide Semiconductor) sensor, converts an analog signal output from the imaging device into a digital signal, and converts it into image data (captured image). An image sensor 13 for forming and outputting is provided. In the image sensor 13, the illumination areas (the above-described areas Aa to Ai) set in each of the lighting fixtures 10 are set as the imaging areas. Further, the image sensor 13 captures an imaging region in response to a request from the control unit 12 described later, and outputs the generated image data to the control unit 12. In the present embodiment, image data is output from the image sensor 13 to the control unit 12 approximately every 1/30 second.

  Moreover, each lighting fixture 10 is provided with the memory | storage part 14 which memorize | stores the various data in which reading / writing is performed by the control part 12. FIG. The storage unit 14 is composed of a volatile memory such as a double data rate synchronous dynamic random access memory (DDRAM), and a large-capacity memory is used so as to be able to store a plurality of image data output from the image sensor 13. .

  Furthermore, the luminaire 10 includes a control unit 12 including a processor capable of processing a large amount of arithmetic processing such as a DSP (Digital Signal Processor) or an advanced image processor. The control unit 12 includes a difference image generation unit 15 that generates a difference image between two pieces of image data, a human body detection unit 16 that detects presence / absence of a person based on the difference image, and a luminance in an imaging region based on the difference image. A luminance change detection unit 17 that detects a change is provided as a component. Moreover, the control part 12 is equipped with the illumination control part 18 which outputs the light control signal for controlling the lighting state of the light source 11 based on the detection output from the human body detection part 16 and the brightness change detection part 17 as the component. .

  The difference image generator 15 refers to the current image data input from the image sensor 13 (see FIG. 4A) and the image data indicating the background image stored in the storage unit 14 (see FIG. 4B). ) And a difference image (see FIG. 4C) are generated and output to the human body detection unit 16. Here, the pixel groups P1 and P2 in FIGS. 4A to 4C correspond to objects such as desks, and the pixel group P3 corresponds to a person. Therefore, as shown in FIG. 4 (c), the pixel groups P1 and P2 existing in both the current image data and the image data indicating the background image are removed from the difference image and exist only in the current image data. Only the pixel group P3 to be output is output as a difference image.

  Here, for the background image described above, for example, image data obtained by imaging the imaging area by the image sensor 13 in a state where no person exists in the imaging area at the time of initial setting until the start of human detection is used. Note that the image data output from the image sensor 13 when it is determined that there is no person may be stored in the storage unit 14 as a background image at any time, and the background image may be updated in real time. In this way, for example, even when an object other than a person (such as a desk or chair) is newly installed, these objects can be output without being included in the difference image. Detection accuracy can be improved.

  For example, the human body detection unit 16 determines whether or not there is a set of pixels having a shape and area of a predefined human model in the difference image generated by the difference image generation unit 15, and this set of pixels exists. Then, it is determined that there is a person in the illumination area (the above-described areas Aa to Ai). If it is determined that a person is present, a human body detection signal indicating that a person is present in the corresponding area Aa to Ai is output to the illumination control unit 18. Note that the method by which the human body detection unit 16 determines the presence / absence of a person in the illumination area is not limited to the above-described method, and for example, the presence / absence of a person is determined using the maximum value or average value of the difference amount in the difference image. Alternatively, the total number of pixels in which differences have occurred may be used.

  Based on the difference image generated by the difference image generation unit 15, the luminance change detection unit 17 detects a change in luminance of adjacent areas (areas A <b> 1 and A <b> 2 in FIG. 1) adjacent to the other lighting fixtures 10 and detects the change. The result is output to the illumination control unit 18. This adjacent area A1 is an area within a predetermined distance from each of the four sides in the illumination areas (areas Aa to Ai) of each luminaire 10, and is a rectangular area that partially overlaps each other as shown in FIG. Moreover, adjacent area | region A2 is an area | region where the above-mentioned area | region A1 overlaps, and is each provided in the four corners in the illumination area | region (area | region Aa-Ai) of each lighting fixture 10. FIG.

  Here, as shown in FIG. 5, the luminance change detection unit 17 sets a set of pixels corresponding to the adjacent regions A1 and A2 as pixel groups Q1 and Q2, respectively, and the difference amount between the pixel group Q1 and the pixel group Q2 in the difference image. When it is largely biased, a luminance change detection signal is output to the illumination control unit 18. That is, the presence / absence of a luminance change in the adjacent areas A1 and A2 is determined based on the ratio of the difference pixels to all the pixels of the difference image and the ratio of the difference pixels in the pixel groups Q1 and Q2. In addition, the luminance change detection signal includes information indicating that a luminance change has occurred and identifying the areas A1 and A2 (or pixel groups Q1 and Q2) where the luminance change has occurred.

  Further, when the luminance change detection unit 17 determines that the luminance change is concentrated on the pixel groups Q1 and Q2 as described above and detects the luminance change, the luminance change detection unit 17 uses the pixel groups Q1 and Q2 on which the luminance change is concentrated as a base point. It is determined whether or not the predetermined rectangular model exists. When it is determined that the rectangular model exists, the luminance change detection unit 17 determines the set of pixels as a human figure and can identify adjacent areas A1 and A2 (or pixel groups Q1 and Q2) where the human figure is generated. At the same time, it is output to the illumination controller 18 as a shadow detection signal.

  The illumination control unit 18 determines a change pattern of the luminance change based on the luminance change detection signal and the shadow detection signal input from the luminance change detection unit 17, and the human body detection signal input from the change pattern and the human body detection unit 16. The lighting state of the light source 11 is controlled according to the presence or absence of. Here, a lighting state in which the light source 11 is turned off or turned on at a low dimming level is referred to as a standby state, and a state in which the light source 11 is lit at the upper limit of the dimming level is referred to as a full lighting state. In addition, a first dimming state and a second dimming state having different dimming levels are provided between the standby state and the full lighting state, and the first dimming state is lower (darker) than the second dimming state. Set the light control level. In the present embodiment, the first dimming state is set to the same lighting level as the standby state, and the second dimming state is set to the semi-lighting state.

  Here, when the human body detection signal is input when the light source 11 is in the standby state or the first / second dimming state, the illumination control unit 18 outputs a dimming signal and outputs the light source. 11 is set to the full lighting state. Thereby, when a person enters into the illumination area (the above-mentioned areas Aa to Ai) of each lighting fixture 10, the lighting state of the light source 11 is set to the full lighting state, and the corresponding areas Aa to Ai are desired. Illuminated with brightness.

  In addition, when the light source 11 is in the standby state, the illumination control unit 18 controls the light source 11 to the first dimming when the human body detection signal is not input and the luminance change detection signal is input (first change pattern). Set to state. At this time, when a shadow detection signal indicating the same pixel group Q1, Q2 as the pixel group Q1, Q2 indicated by the luminance change detection signal is input (second change pattern), the light source 11 is set to the second dimming state. Set to.

  That is, when the luminance change detection signal is input in the standby state, the lighting control unit 18 determines that the adjacent lighting device 10 is turned on, and obtains the clearness by setting the light source 11 in the first dimming state. Yes. When a shadow detection signal is input, the adjacent lighting device 10 is turned on, and it is determined that there is a person in the vicinity of the lighting area of the own device (the above-described areas Aa to Ai). By setting the light source 11 in the state, auxiliary light is obtained.

For example, as shown in FIG. 6A, when the lighting fixture 10g detects a person and becomes fully lit, adjacent areas A1, A2, and A2 provided on the lower side of the lighting area (region Ad) of the lighting fixture 10d are displayed. It becomes brighter. At the same time, the adjacent area A2 provided in the lower left corner of the illumination area (area Ae) of the luminaire 10e and the adjacent areas A1, A2, A2 on the left side of the illumination area (area Ah) of the illumination area 10h become brighter. At this time, the luminance change detection unit 17 of the lighting fixture 10d can determine that the lighting fixture 10g is turned on because the difference pixels are concentrated in the pixel regions Q1, Q2, and Q2 corresponding to the lower side of the region Ad.

Here, as shown in FIG. 6A, when a person is present on the left side of the luminaire 10g in the region Ag, no person is generated in the region Ad. In the luminaire 10d, a person is present in the vicinity of the region Ad. It can be determined that it does not exist. Thereby, as shown in FIG.6 (b), the lighting state of lighting fixture 10d, 10e, 10h is controlled to the 1st light control state which is the same lighting level as a standby state.

  On the other hand, as shown in FIG. 7A, when a person is present on the side of the luminaire 10d in the region Ag, the luminance changes in the same region as in FIG. 6A, and the lower side of the region Ad. A human figure with the area A1 as a base point is generated. When the luminance change detection unit 17 of the lighting fixture 10d detects this human shadow, the lighting fixture 10d can determine that a person is present near the area Ad. Thereby, the lighting fixture 10d is set to the semi-lighting state which is the second dimming state, and the lighting fixtures 10e and 10h are controlled to the first dimming state which is the same lighting level as the standby state (FIG. 7 (b)).

  In this way, based on the luminance change detection signal and the shadow detection signal, not only the lighting area of the own device (the area Ad in the lighting apparatus 10d) but also the lighting areas (the areas Aa to Ac and the area Ae) of the surrounding lighting apparatus 10 The light source 11 can be appropriately controlled based on the state of ~ Ai). Therefore, unnecessary power consumption caused by a change in luminance due to lighting of the surrounding lighting fixture 10 can be reduced, and energy saving can be realized.

  In the present embodiment, as the human sensor, the image sensor 13 and the human body detection unit 16 that detects the presence or absence of a person based on the image output from the image sensor 13 are employed. Changes in brightness can be acquired with high density. Thereby, false detection of a moving object other than a person can be reduced.

  In addition, by setting the lighting state of the light source 11 according to the change pattern of the luminance change detected by the luminance change detection unit 17, fine setting according to the lighting state of the surrounding lighting fixture 10 and the position of the person is performed. Is possible. Moreover, as this change pattern, by providing a change pattern in which only a part adjacent to another lighting fixture 10 is changed, it is possible to easily determine a change in the lighting state of the neighboring lighting fixture 10. Further, by providing a change pattern in which a region having a shape and area of a preset person model changes around the region where the luminance change has occurred, it is possible to set a lighting state according to the position of the person.

  In the present embodiment, each lighting fixture 10 is provided with a control unit 12, an image sensor 13, and a storage unit 14. However, as shown in FIG. You may make it provide the structure of. That is, the individual lighting fixtures 10 do not independently control the lighting state of the own device, but the control device 20 intensively detects a person or changes in luminance in adjacent areas, and The lighting state may be controlled.

  In this case, as shown in FIG. 8B, the control device 20 is disposed on the ceiling surface in the vicinity of the lighting fixture 10. Further, as shown in FIG. 8C, the control device 20 includes a difference image generation unit 15, a human body detection unit 16, and a luminance change detection unit 17 as its constituent elements together with the image sensor 13 and the storage unit 14. It is set to be able to communicate with the lighting apparatus 10 via the communication line L1. In addition, the human body detection unit 16 and the luminance change detection unit 17 detect a person, detect a luminance change, and a shadow for each illumination area of the connected luminaire 10, and output a detection signal for each detected illumination area. By doing in this way, the unnecessary power consumption resulting from the brightness | luminance change by the surrounding lighting fixture 10 having lighted more efficiently can be reduced, and energy saving can be implement | achieved.

DESCRIPTION OF SYMBOLS 1 Lighting control system 10 (10a-10i) Lighting fixture 11 Light source 12 Control part 13 Image sensor 14 Memory | storage part 15 Difference image generation part 16 Human body detection part 17 Luminance change detection part 18 Lighting control part Aa-Ai area | region (illumination area)

Claims (5)

A plurality of lighting fixtures, a human sensor for detecting the presence / absence of a person for each lighting region of the plurality of lighting fixtures, and a luminance change in an adjacent region adjacent to the lighting region of another lighting fixture for each lighting region A luminance change detection unit for detecting the lighting device, and a lighting control unit for controlling the lighting state of the lighting fixture based on the detection output from the human sensor and the luminance change detection unit,
The lighting control unit controls lighting of the corresponding lighting fixture at a predetermined first control level when the human sensor detects a person in the lighting area, and the human sensor detects the person in the lighting area. And lighting control is performed at a second control level that is darker than the first control level when a change in luminance is detected in the adjacent area in the illumination area. Control system.   The human sensor includes an image sensor that images the illumination area and outputs a captured image, and a human body detection unit that detects the presence or absence of a person based on a difference between the captured image output from the image sensor and a reference image. The illumination control system according to claim 1, wherein the brightness change detection unit detects the brightness change based on a difference between the captured image output from the image sensor and the reference image.   When the change pattern of the brightness change detected by the brightness change detection unit is a predetermined first pattern, the lighting control unit controls the lighting state of the corresponding lighting fixture to a standby lighting state, 3. The illumination control system according to claim 1, wherein when the change pattern is a predetermined second pattern, the lighting state of the corresponding lighting fixture is controlled to a semi-lighting state. 4. .   The illumination control system according to claim 3, wherein the first pattern is a change pattern in which a change in luminance is concentrated in the adjacent area.   5. The second pattern according to claim 3, wherein a change in luminance is concentrated in the adjacent area, and a change in luminance is present in an area larger than a predetermined size with the adjacent area as a base point. The lighting control system according to any one of the above.

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