JP4888229B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device that includes a lighting device that illuminates an illumination target and an infrared image sensor that performs detection using a plurality of pixels, and that detects a person and controls the operating state of the lighting device. .

  As this type of system, a system described in Patent Document 1 is known. In this system, a thermal infrared matrix sensor configured by arranging pixels for detecting infrared rays in a matrix is used. The floor area to be detected is divided into a plurality corresponding to the pixels, and it is detected whether or not there is a human body in the area.

Here, as an example, the floor is divided into 30 cm × 30 cm areas for monitoring, and when the floor area is increased, a thermal infrared matrix sensor having a corresponding number of pixels is required, resulting in an expensive system. There was a problem. In addition, the operation using all the pixels of the sensor is performed regardless of the presence or absence of a person, resulting in a problem that power consumption increases.
Japanese Patent Laid-Open No. 9-42924

  The present invention has been made as a solution to the problems of the conventional lighting device as described above, and an object of the present invention is to provide a lighting device capable of reducing power consumption.

  An illuminating device according to the present invention includes a luminaire that illuminates an illuminating target; an infrared image sensor that detects the illuminating target with a plurality of pixels; and a human body detection mode that detects the presence of a person by receiving an output from the infrared image sensor. And a heat detection mode for detecting whether or not there is a heat source in the area to be illuminated in response to the output of the infrared image sensor; and when the detection unit operates in the heat source detection mode, the infrared image A control unit that operates a predetermined number of pixels of the sensor and controls the detection unit to a human body detection mode by operating a predetermined number of pixels or more of the infrared image sensor when a heat source is detected in the heat source detection mode. It is characterized by.

  Usually, the lighting fixture is provided on the ceiling side, and the illumination target is on the floor side. The infrared image sensor preferably has an optical lens disposed on the front surface of the light receiving surface and forms an image on the light receiving surface by the optical lens. Further, a pan / tilt mechanism may be provided so as to change the imaging range.

  Some image processing is based on human detection, but in addition to human detection, image processing for detecting a fire such as smoke or flame may be performed. In this case, a pan / tilt mechanism may be provided so as to change the detection range.

  The heat source detection sensor operates in the temperature range where human detection is performed, but if a heat source that is over-ranged is detected, the infrared image sensor is operated in the temperature range where fire detection is performed and a notification is given in the event of an abnormality. It may be configured to connect to a response by the supervisor.

  In the illumination device according to claim 2, the detection means used in the heat source detection mode uses a heat source detection sensor different from the infrared image sensor used in the human body detection mode, and the heat source detection sensor has a wider range than the infrared image sensor. A detection area is set, and when a heat source is detected by a heat source detection sensor, an infrared image sensor of a lighting fixture that includes the detected heat source as an illumination target is operated.

  When the heat source detection sensor is constituted by a sensor different from the infrared image sensor as the detection means used in the heat source detection mode, for example, a pyroelectric sensor can be used. In this case, a pan / tilt mechanism may be provided so as to change the detection range.

  In the illumination device according to claim 3, in the heat source detection mode, the control unit fixedly or sequentially selects a predetermined number of pixels in the infrared image sensor and uses the output as a sensor output. And

  In the lighting device according to claim 4, a plurality of lighting fixtures are provided, and the control unit controls the brightness of the lighting fixtures to be activated according to the number of illumination target areas corresponding to the detected heat sources. It is characterized by.

  In the illuminating device of the present invention, when the detection unit operates in the heat source detection mode, a predetermined number of pixels of the infrared image sensor are operated. Therefore, the infrared image sensor does not perform an operation using all the pixels at the same time and consumes power. Can be reduced. Further, when the heat source is detected in the heat source detection mode, a predetermined number or more pixels of the infrared image sensor are operated to set the detection unit to the human body detection mode, so that human detection can be performed by the output of the infrared image sensor.

  In the illumination device according to claim 2, the detection means used in the heat source detection mode uses a heat source detection sensor different from the infrared image sensor used in the human body detection mode, and the heat source detection sensor has a detection area in a wider range than the infrared image sensor. Is set, and when the heat source is detected by the heat source detection sensor, the infrared image sensor of the luminaire including the detected heat source as an illumination target is operated, so that the infrared image sensor in a necessary portion can be set in the imaging operation state. Therefore, power consumption can be reduced.

  In the lighting device according to claim 3, a plurality of lighting fixtures are provided, and the control unit selects a predetermined number of pixels in the infrared image sensor in a heat source detection mode in a fixed or sequential manner, and outputs the output from the sensor. Since the output is used, power consumption can be reduced.

  In the illuminating device according to claim 4, since the brightness of the luminaire to be activated is controlled according to the number of illumination target areas corresponding to the detected heat source, the brightness according to the size or spread of the heat source is controlled. Lighting can be provided.

  Embodiments of a lighting device according to the present invention will be described below with reference to the accompanying drawings. In each figure, the same components are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 shows a block diagram of a lighting device according to the present invention. In this system, lighting fixtures 1-1 to 1-n are provided. The lighting fixtures 1-1 to 1-n are installed on a ceiling of a room, for example. S1 to Sm are infrared image sensors that detect whether or not there is a heat source in the area of the illumination target (here, the floor), and are installed on the ceiling of a room, for example. The lighting fixtures 1-1 to 1-n and the infrared image sensors S1 to Sm are associated with each other on a one-to-one basis.

  As an example, nine infrared image sensors S1 to S9 are provided on the ceiling in a room R as shown in FIG. The infrared image sensors S1 to S9 are provided at a ceiling position corresponding to an intersection of line segments that divide the floor E into 16 equal parts, and one infrared image sensor has four areas surrounding the intersection as an imaging range. For example, since the floor E is divided into areas E11 to E44 shown in FIG. 3 and the infrared image sensors S1 to S9 are provided at positions corresponding to the centers of the four areas, the infrared image sensor S1 is E11, E12, E21, E22. The infrared image sensor S2 has four imaging areas E12, E13, E22, and E23, and the infrared image sensor S9 has four imaging areas E33, E34, E43, and E44. And

  4 and 5 show the above relationship three-dimensionally. FIG. 4 shows that the infrared image sensor S1 has four areas E11, E12, E21, and E22 as the imaging range. Indicates that the imaging ranges of the infrared image sensors S1, S2, and S4 are E11, E12, E13, E21, E22, E23, E31, and E32, and some imaging ranges overlap.

  The infrared image sensors S1 to Sm, for example, perform imaging with 10 × 10 100 pixels as shown in FIG. 6, and here, for example, only the central pixel (shown blacker than the others) in each block obtained by dividing the pixel into four. By reading out signals corresponding to the above, it is possible to capture images with low resolution.

  The lighting fixtures 1-1 to 1-n and the infrared image sensors S1 to Sm are connected to the control device 10 as shown in FIG. The control device 10 is provided with an illumination control unit 12 for controlling the lighting fixtures 1-1 to 1-n and a sensor control unit 13 for controlling the infrared image sensors S1 to Sm.

  The detection unit 11 is connected to the illumination control unit 12 and the sensor control unit 13. An image processing unit 14 is attached to the detection unit 11, and the detection unit 11 has a heat source in a region to be illuminated based on low resolution signals sent from the infrared image sensors S 1 to Sm via the sensor control unit 13. In addition to executing a heat detection mode for detecting whether or not the image is detected, an image is obtained from an image signal in imaging by all pixels, and an image processing unit 14 performs image processing to execute a human body detection mode for detecting the presence of a person.

  The detection unit 11 gives an instruction to the sensor control unit 13 to set the corresponding infrared image sensor to the imaging operation state of all pixels when it is detected that there is a heat source. When the image processing unit 14 of the detection unit 11 detects a person based on all pixel outputs of the infrared image sensor, it gives an instruction to the lighting control unit 12 to set the corresponding lighting fixture to the operating state. At this time, the detection unit 11 provides the illumination control unit 12 with information for controlling the brightness of the luminaire to be activated according to the number of illumination target areas corresponding to the detected heat source.

  In the illumination device configured as described above, initially, only the pixel at the center of the block obtained by dividing all the pixels into four from the sensor control unit 13 to the infrared image sensors S1 to Sm (in the example of FIG. 6, A heat detection mode by reading a signal with a low resolution corresponding to all four pixels) is instructed. Further, the illumination control unit 12 instructs the lighting fixtures 1-1 to 1-n to turn off the illumination.

  The detection unit 11 operates as shown in the flowchart of FIG. The low-resolution signals of the infrared image sensors S1 to Sm are received from the sensor control unit 13 and compared with an appropriate threshold value to detect whether a heat source is present (S11). If it is detected that there is no heat source, step S11 is repeated. When the presence of the heat source is detected, an instruction is given from the sensor control unit 13 to the infrared image sensor corresponding to the area where the heat source is detected to operate as the all-pixel imaging mode (human body detection mode) (S12), and step again The process returns to S11 and continues.

  For example, a heat source as shown in the hatching shape A of FIG. 8A appears, and in step S11 of FIG. 7, detection with the heat source is performed by the infrared image sensors S1 to S6. At this time, as shown in FIG. 8B, the presence of a heat source is detected in areas E12, E13, E22, and E23. Therefore, in step S12, the infrared image sensors S1 to S6 having these areas as detection target areas are in the all-pixel imaging mode. As a result, as shown in FIG. 9, except for the areas E41, E42, E43, and E44, the image is picked up by all pixels. As shown in FIG. 10, the areas E12, E13, E22, and E23 may be imaged by all pixels. In the case of FIG. 10, the infrared image sensor S2 performs imaging with all pixels, and the infrared image sensors S1, S3, and S5 perform imaging with all pixels in two of the four blocks, and the infrared image sensors S4 and S6. In one block among the blocks divided into four, imaging is performed with all pixels.

  Further, in order to correspond to the infrared image sensor that operates as the all-pixel imaging mode, the detection unit 11 operates as shown in the flowchart of FIG. An image corresponding to the image signal sent from the infrared image sensor operating as the all-pixel imaging mode is captured via the sensor control unit 13 (S21), and image processing is performed on the image by the image processing unit 14 by a technique such as pattern matching. And human detection is performed (S22).

  In the human detection determination in step S22, when the presence of a person is detected, the luminaire corresponding to the human body detection area is turned on (S23). At this time, the brightness of the luminaire to be operated is controlled according to the number of illumination target areas in which the heat source is detected (S23).

  The process in step S23 will be specifically described. For example, a heat source as shown in the hatching shape A of FIG. 8A appears, and in step S11 of FIG. 7, the presence of the heat source is detected by the infrared image sensors S1 to S6, and the infrared image sensors S1 to S6 are detected. The all-pixel imaging mode is set. In this case, it is assumed that a person is detected. At this time, since the presence of a person is detected in the low resolution operation of the infrared image sensors S1 to S6, the area E12 shown in FIG. 8 (b) using signals sent from the infrared image sensors S1 to S6 operating at a low resolution. It is detected that a heat source is present at E13, E22, and E23.

  The number of imaging ranges in which the heat sources are detected for each of the infrared image sensors S1 to S6 corresponds to the number of pixels in four pixels in which the heat sources are detected. Accordingly, in this example, the infrared image sensors S1, S3, and S5 have two areas, the infrared image sensor S2 has four areas, and the infrared image sensors S4 and S6 have one area. Therefore, for example, lighting fixtures corresponding to the infrared image sensor S2 are lit at high illuminance, lighting fixtures corresponding to the infrared image sensors S1, S3, S5 are lit at medium illuminance lower than high illuminance, and infrared image sensors S4, S6. The lighting fixtures that correspond to the illuminator are lit at a low illuminance that is lower than the medium illuminance. Note that the number of pixels in the low-resolution operation is used for the number of imaging ranges for each of the infrared image sensors S1 to Sm, but based on the output of the infrared image sensor operating in the all-pixel imaging mode, It can also be obtained by determining in how many pixels of the pixel the heat source (a part of the human corresponding image) has been detected.

  Subsequent to step S23, it is detected whether there is an infrared image sensor in which human detection is not performed (S24), and an illuminator in an area corresponding to the infrared image sensor in which human detection is not performed is selected. The light is turned off (S25), and the process returns to step S21 to continue the process.

  In the above description, as the heat detection mode, four of all the pixels in the infrared image sensors S1 to Sm are fixedly selected and the outputs thereof are used as sensor outputs. The infrared image sensor S1 is as follows. It is also possible to sequentially select a predetermined number (here, four) of all the pixels in .about.Sm and use the output as a sensor output.

  For example, when the infrared image sensors S1 to Sm perform imaging with 10 × 10 100 pixels as shown in FIG. 6, one pixel (others) sequentially selected in each block obtained by dividing the pixel into four as in FIG. By reading out signals corresponding only to (shown in black), it is possible to capture images with low resolution. That is, when imaging with low resolution is performed as the heat source detection mode, initially, the signal of the upper left pixel is read out and selected in an appropriate cycle in each block obtained by dividing the pixel into four as shown in FIG. The position of one pixel is shifted as shown in FIG.

  When pixels at positions as shown in FIG. 12 are used in a fixed manner, it is expected that corner portions in one area are detected and diagonal portions are not detected, but as shown in FIG. By sequentially shifting the position one pixel at a time, it is possible to eliminate the possibility that there is a portion that cannot be detected in the area, to widen the monitoring range, and to reduce power consumption. In this example, the position of the read pixel is sequentially shifted by one pixel. However, it may be shifted by a plurality of pixels such as two or three pixels, or may be sequentially jumped to a predetermined random position. Needless to say, however.

  FIG. 14 shows a configuration diagram of a lighting apparatus according to the second embodiment. In this illumination device, an infrared image sensor 18 is connected to the sensor control unit 13A. The infrared image sensor 18 is a detection means used in the heat source detection mode, and a detection area in a wider range than each of the infrared image sensors S1 to Sm is set. For example, as shown in FIG. The entire heat source of R can be monitored by being divided into areas E11 to E44, and the detection result is sent to the detection unit 11A via the sensor control unit 13A. The infrared image sensor 18 has a configuration in which a constant current is supplied to a sensor diode that constitutes a pixel so as to detect a person, and an overrange is notified in the case of detecting high heat such as a flame. The detection unit 11A is provided with an image processing unit 14A that performs flame and smoke detection in addition to image processing for human detection.

  The detection unit 11A is connected to display means such as a speaker and a display board, and other notification means 19-1 to 19-k such as a siren, so that a fire can be notified. The infrared image sensors S1 to Sm are instructed to perform a sweep operation when the system is started up and are in a waiting state for the operation instruction. Also in the infrared image sensors S1 to Sm, a constant current is supplied to the sensor diodes constituting the pixels so as to perform human detection in a normal state.

  In the illuminating device having the above configuration, the detection unit 11A performs processing corresponding to the flowchart shown in FIG. 7 described above by using the infrared image sensor 18 in the heat source detection mode. As a result, when the heat source is detected by the infrared image sensor 18, the detection unit 11A performs processing corresponding to the flowchart shown in FIG. As a result, the infrared image sensor corresponding to the area where the heat source is detected enters the all-pixel imaging mode, performs human detection, and performs appropriate illumination control as already described. As a result, the infrared image sensors S1 to Sm are in a low power consumption state until a heat source is detected by the infrared image sensor 18, and the power consumption can be reduced.

  Further, the detection unit 11A performs processing corresponding to the flowchart shown in FIG. That is, the time-up of a predetermined time is detected based on the timer (S31), and when the time-up occurs, all of the infrared image sensors S1 to Sm (every other, such as every other one) may be set as the all-pixel imaging mode. (S33).

  For the processing in step S33, the detection unit 11A performs processing corresponding to the flowchart shown in FIG. Accordingly, appropriate illumination control is performed even when the infrared image sensor 18 is erroneously detected or malfunctioned.

  Further, when branching to NO in step S31, it is monitored whether the infrared image sensor 18 has detected an overrange heat source (S32). The image sensor is operated in the fire detection all-pixel imaging mode (S34).

  For the processing in step S34, the detector 11A performs the operation shown in the flowchart of FIG. That is, an image is captured from the infrared image sensor operating in the fire detection all-pixel imaging mode (S41). Here, in the infrared image sensor that has received an operation instruction in the fire detection all-pixel imaging mode, a smaller constant current is supplied to the sensor diode that constitutes the pixel than in the case of human detection so as to detect high heat such as flame.

  In the detection unit 11A, the image processing unit 14A performs image processing for detecting flames and smoke (S42). In order to detect flames and smoke, the image processing unit 14A performs processing for detecting whether a change in the size of the heat detection area (basically, an increase) is observed based on an interframe difference or the like. Subsequent to step S42, it is detected whether there is a flame or smoke (S43), and if there is a flame or smoke, the notification means 19-1 to 19- The notification is sent to k (S44). For example, when the detection unit 11A includes a speech synthesizer and the notification means 19-1 to 19-k are speakers, an announcement such as “a small fire has occurred in the XX floor XX zone” and a siren are provided. Performs siren sounding, and if there is a display such as a display panel, the detection unit 11A has a display control function and performs necessary display.

  Thus, according to the present lighting device, it is possible not only to perform appropriate illumination control using the infrared image sensors S1 to Sm for human detection, but also to monitor the fire using image collection for detecting flames and smoke. Can be done appropriately.

  FIG. 18 shows a configuration diagram of a lighting apparatus according to the third embodiment. In this illumination device, a pyroelectric sensor 17 is connected to the sensor control unit 13B. The pyroelectric sensor 17 is a detection means used in the heat source detection mode, and has a detection area in a wider range than each of the infrared image sensors S1 to Sm. For example, as shown in FIG. The entire heat source of R can be monitored by being divided into areas E11 to E44, and the detection result is sent to the detection unit 11B via the sensor control unit 13B.

  In the illumination device according to the above configuration, the detection unit 11B performs processing corresponding to the flowchart shown in FIG. That is, the time-up of a predetermined time is detected based on the timer (S51), and when the time-up occurs, all of the infrared image sensors S1 to Sm (every other, such as every other one) may be set as the all-pixel imaging mode. (S53). With this timer, appropriate illumination control is performed even when the pyroelectric sensor 17 is erroneously detected or failed.

  If the process branches to NO in step S31, it is detected whether the pyroelectric sensor 17 has detected the heat source (S52). If the heat source cannot be detected, the process returns to step S51. When the presence of a heat source is detected in step S52, the process proceeds to step S53, and all of the infrared image sensors S1 to Sm (may be other, such as every other one) may be set to the all-pixel imaging mode (S53).

  For the processing in step S53, the detection unit 11B performs processing corresponding to the flowchart shown in FIG. Thus, according to the present illumination device, it is possible to perform appropriate illumination control using the infrared image sensors S1 to Sm for human detection.

1 is a block diagram showing a first embodiment of a lighting device according to the present invention. The perspective view which shows the relationship between the infrared image sensor used in 1st Embodiment of the illuminating device which concerns on this invention, and a monitoring object area. FIG. 2 is a plan view showing a relationship between an infrared image sensor and a monitoring target area used in the first embodiment of the lighting device according to the present invention. FIG. 3 is a perspective view showing the relationship between one infrared image sensor used in the first embodiment of the lighting device according to the present invention and a monitoring target area. The perspective view which shows the relationship between the three infrared image sensors used in 1st Embodiment of the illuminating device which concerns on this invention, and a monitoring object area. FIG. 3 is a plan view showing a pixel position when the infrared image sensor used in the first embodiment of the illumination device according to the present invention is used in a heat source detection mode. 3 is a flowchart showing the operation of the first embodiment of the illumination device according to the present invention. FIG. 3 is a plan view showing the relationship between pixel positions and areas when heat detection is performed by an infrared image sensor in the first embodiment of the illumination device according to the present invention. FIG. 2 is a plan view showing an area that becomes an all-pixel imaging mode when heat detection is performed by an infrared image sensor in the first embodiment of the illumination device according to the present invention. FIG. 2 is a plan view showing an area that becomes an all-pixel imaging mode when heat detection is performed by an infrared image sensor in the first embodiment of the illumination device according to the present invention. 3 is a flowchart showing the operation of the first embodiment of the illumination device according to the present invention. FIG. 3 is a plan view showing a pixel position when the infrared image sensor used in the first embodiment of the illumination device according to the present invention is used in a heat source detection mode. FIG. 3 is a plan view showing a pixel position shifting operation when the infrared image sensor used in the first embodiment of the illumination device according to the present invention is used in a heat source detection mode. The block diagram which shows 2nd Embodiment of the illuminating device which concerns on this invention. The perspective view which shows the infrared image sensor for a person detection used in 2nd Embodiment of the illuminating device which concerns on this invention, the infrared image sensor for a heat detection, and the relationship of a monitoring object area. The flowchart which shows operation | movement of 2nd Embodiment of the illuminating device which concerns on this invention. The flowchart which shows operation | movement of 2nd Embodiment of the illuminating device which concerns on this invention. The block diagram which shows 3rd Embodiment of the illuminating device which concerns on this invention. The perspective view which shows the relationship between the infrared image sensor and pyroelectric sensor used in 3rd Embodiment of the illuminating device which concerns on this invention, and a monitoring object area. The flowchart which shows operation | movement of 3rd Embodiment of the illuminating device which concerns on this invention.

Explanation of symbols

1-1 to 1-n Lighting fixture 10 Control device 11 Detection unit 11A, 11B Detection unit 12 Illumination control unit 13 Sensor control unit 13A, 13B Sensor control unit 14 Image processing unit 14A Image processing unit 17 Pyroelectric sensor 18 Infrared image sensor 19-1 to 19-n Notification means S1-Sm Infrared image sensor

Claims (4)

A luminaire for illuminating the object to be illuminated;
An infrared image sensor for detecting a plurality of pixels with respect to an illumination target;
A detection unit having a human body detection mode for detecting the presence of a person by receiving the output of the infrared image sensor and a heat detection mode for detecting whether or not there is a heat source in the illumination target area by receiving the output of the infrared image sensor When;
When the detection unit operates in the heat source detection mode, the predetermined number of pixels of the infrared image sensor are operated, and when the heat source is detected in the heat source detection mode, the predetermined number or more pixels of the infrared image sensor are operated. A controller that controls the human body detection mode;
An illumination device comprising: The detection means used in the heat source detection mode uses a heat source detection sensor different from the infrared image sensor used in the human body detection mode, and the heat source detection sensor has a detection area in a wider range than the infrared image sensor. 2. The illumination device according to claim 1, wherein when the heat source is detected by the sensor, the infrared image sensor of the luminaire including the detected heat source as an illumination target is operated. 3. The control unit according to claim 1, wherein, in the heat source detection mode, the predetermined number of pixels in the infrared image sensor is fixedly or sequentially selected, and the output is used as a sensor output. 4. Lighting device. A plurality of lighting fixtures are provided, and the control unit controls the brightness of the lighting fixtures to be activated according to the number of illumination target areas corresponding to the detected heat source. The lighting device according to any one of the above.