Lighting device and lighting control method

Abstract

This disclosure provides a lighting device and lighting control method that enable the driver to appropriately see a person located outside the vehicle, regardless of the driving environment. [Solution] The lighting device 10 according to the present disclosure includes a lighting unit 14 that can change the brightness of each of the multiple divided light distribution areas, an imaging unit 11 that images a target space including the light distribution area, an identification unit 12 that identifies the area containing a person as a target area when the image captured by the imaging unit includes a person, and a lighting control unit 15 that controls the lighting unit to turn off the target area of ​​the light distribution area and turn on the non-target area of ​​the light distribution area excluding the target area, based on the brightness of the target space.

Description

Technical Field

[0001] The present disclosure relates to a lighting device and a lighting control method.

Background Art

[0002] Technologies have been developed to facilitate a vehicle driver's visual recognition of a person located outside the vehicle. Patent Document 1 discloses a lighting device that, when a person is included in a target space, extinguishes or dims the light so that the person's face appears relatively dark, and irradiates strong light so that the body below the person's face and the space leading to it appear relatively bright.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the lighting device disclosed in Patent Document 1 described above, depending on the environment of the target space, it may be difficult for the driver to recognize a person.

[0005] The present disclosure has been made in view of such circumstances, and an object thereof is to provide a lighting device capable of recognizing a person located outside the vehicle according to the driving environment.

Means for Solving the Problems

[0006] The lighting device according to the present disclosure is a lighting unit capable of changing the brightness of each divided region obtained by dividing a light distribution region into a plurality of regions, an imaging unit that images a target space including the light distribution region, and an identification unit that, when a person is included in the image captured by the imaging unit, identifies the region including the person as a target region. The system includes a lighting control unit that controls the lighting unit to turn off the target area within the light distribution area and turn on the non-target area within the light distribution area excluding the target area, based on the brightness of the target space.

[0007] The lighting device described herein controls the lighting unit to switch between a first mode, in which the target area of ​​the light distribution area is turned off and the non-target area of ​​the light distribution area is illuminated, and a second mode, in which the entire light distribution area is illuminated, based on the brightness of the target space. With this configuration, the lighting device can appropriately recognize people located outside the vehicle according to the driving environment.

[0008] The lighting control method relating to this disclosure is: The target space, including the light distribution area of ​​the lighting device, is imaged. If a person is included in the captured image, the region containing the person is identified as the target region. Based on the brightness of the target space, the lighting device is controlled to turn off the target area within the light distribution area and to turn on the non-target area within the light distribution area excluding the target area. The computer performs the process.

[0009] The lighting control method disclosed herein controls the lighting unit to switch between a first mode, in which the target area of ​​the light distribution area is turned off and the non-target area of ​​the light distribution area excluding the target area is turned on, and a second mode, in which the entire light distribution area is turned on, based on the brightness of the target space. With this configuration, the driver can appropriately recognize people located outside the vehicle according to the driving environment. [Effects of the Invention]

[0010] This disclosure provides a lighting device and lighting control method that enable the driver to appropriately recognize a person located outside the vehicle, depending on the driving environment. [Brief explanation of the drawing]

[0011] [Figure 1] This is a block diagram illustrating a lighting device according to Embodiment 1. [Figure 2] It is a schematic diagram showing a light distribution area and a divided area. [Figure 3] It is a schematic diagram in which the brightness of a part of the divided area is changed. [Figure 4] It is a schematic diagram showing the first mode and the second mode of the lighting unit. [Figure 5] It is a flowchart of the lighting control method according to Embodiment 1. [Figure 6] It is a block diagram illustrating the lighting device according to Embodiment 2. [Figure 7] It is a diagram showing an example of map data. [Figure 8] It is a flowchart of the lighting control method according to Embodiment 2. [Figure 9] It is a block diagram illustrating the lighting device according to Embodiment 3. [Figure 10] It is a flowchart of the lighting control method according to Embodiment 3. [Figure 11] It is a schematic diagram showing a target area and a non-target area. [Figure 12] It is a block diagram illustrating the lighting device according to Embodiment 4. [Figure 13] It is a flowchart of the lighting control method according to Embodiment 4. [Figure 14] It is a block diagram illustrating the lighting device according to Embodiment 5. [Figure 15] It is a flowchart of the lighting control method according to Embodiment 5. [Figure 16] It is a block diagram illustrating the lighting device according to Embodiment 6. [Figure 17] It is a flowchart of the lighting control method according to Embodiment 6. [Figure 18] It is a schematic diagram showing a target area and a non-target area. [Figure 19] It is a block diagram illustrating the lighting device according to Embodiment 7.

Embodiments for Carrying Out the Invention

[0012] Embodiments of this disclosure will now be described with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numeral, and redundant explanations are omitted where necessary for clarity. In addition, some reference numerals have been omitted to avoid cluttering the drawings.

[0013] (Embodiment 1) <Lighting equipment> A lighting device according to Embodiment 1 will now be described. Figure 1 is a block diagram illustrating a lighting device according to Embodiment 1. As shown in Figure 1, the lighting device 10 includes an imaging unit 11, an identification unit 12, a brightness sensor 13, an illumination unit 14, and an illumination control unit 15. The lighting device 10 is installed, for example, in a vehicle.

[0014] <Lighting Department> The lighting unit 14 is a light source that can change the light distribution of each of the multiple divided light distribution areas. The lighting unit 14 is, for example, an adaptive headlight installed on a vehicle. The light distribution area and divided areas will be explained in detail with reference to Figures 2 and 3. Figure 2 is a schematic diagram showing the light distribution area and divided areas. Figure 3 is a schematic diagram showing the brightness of a part of the divided area being changed. Although the light distribution area and divided areas are three-dimensional areas, for the sake of simplicity, they will be described as two-dimensional areas here.

[0015] In Figure 2, the light distribution area R1 of the lighting unit (not shown in Figure 2) is shown relative to the road r1. The light distribution area R1 is the area that the lighting unit 14 can distribute light to. The divided areas DR1 are each of the multiple areas obtained by dividing the light distribution area R1. The divided areas DR1 may be areas obtained by equally dividing the light distribution area R1, or areas obtained by dividing the light distribution area R1 into arbitrary areas.

[0016] The lighting unit 14 (see Figure 1) can change the brightness of the divided region DR1 shown in Figure 2. For example, the lighting unit 14 can turn off the divided region DR1 located to the left of the center of the light distribution region R1, and turn on the divided region DR1 located to the right of the center of the light distribution region R1.

[0017] Figure 3 shows an example where areas DR2 and DR3 of the light distribution area R1 of the lighting unit 14 are turned off. As shown in Figure 3, areas DR2 and DR3 become relatively dimmer than the area of ​​the light distribution area R1 excluding areas DR2 and DR3. As a result, to the driver, areas DR2 and DR3 shown in Figure 3 appear as if they are silhouettes.

[0018] <Photography Department> The imaging unit 11 shown in Figure 1 images a target space that includes a light distribution area. For example, the imaging unit 11 is a camera installed on a vehicle. The imaging unit 11 transmits the captured image to the identification unit 12. For example, in Figure 2, the imaging unit 11 images a target space that includes a light distribution area R1. The target space can be spherical, cubic, or rectangular, as long as it includes the light distribution area R1.

[0019] <Identification section> The identification unit 12 shown in Figure 1 detects people from images captured by the imaging unit 11. For example, it extracts the characteristics of a person from the captured image and detects them as a person. The identification unit 12 also identifies the area containing a person as the target area within the light distribution area. Here, the area of ​​the light distribution area excluding the target area is defined as the non-target area. The identification unit 12 includes, for example, an information processing device such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) and a storage device such as RAM or ROM. The identification unit 12 executes a program that analyzes the image from the imaging unit 11 according to the present invention to identify people. The identification unit 12 may be implemented by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The identification unit 12 may be implemented by a combination of hardware and software.

[0020] Referring to Figure 3, we will now explain the target and non-target regions in detail. Here, we assume that people are included in regions DR2 and DR3 shown in Figure 3. In this case, regions DR2 and DR3 of the light distribution region R1 become the target region. On the other hand, the region of the light distribution region R1 excluding regions DR2 and DR3 becomes the non-target region.

[0021] <Brightness Sensor> The brightness sensor 13 acquires the brightness of the target space. The brightness sensor 13 is, for example, an illuminometer. In the example shown in Figure 1, the lighting device 10 is configured to include the brightness sensor 13, but it is not limited to this configuration, and the lighting device 10 does not need to include the brightness sensor 13. That is, the lighting device 10 and a brightness sensor provided outside the lighting device 10 can communicate with each other, and the lighting device 10 may acquire the brightness of the target space by receiving it from the brightness sensor provided outside the lighting device 10.

[0022] <Lighting Control Unit> The lighting control unit 15 controls the lighting unit 14 to switch between a first mode and a second mode based on the brightness of the target space. The first mode is a mode in which the target area is turned off and the non-target area is lit. The second mode is a mode in which the entire light distribution area is lit. Specifically, the lighting control unit 15 controls the lighting unit to enter the first mode when the brightness of the target space is below a threshold. The lighting control unit 15 controls the lighting unit to enter the second mode when the brightness of the target space is greater than the threshold. The lighting control unit 15 includes, for example, an information processing device such as a CPU or MPU and a storage device such as RAM or ROM. The lighting control unit 15 executes a program that controls the operation of the lighting unit 14 according to the present invention. The lighting control unit 15 may be implemented by an integrated circuit such as an ASIC or FPGA. The lighting control unit 15 may be implemented by a combination of hardware and software.

[0023] The first and second modes will be explained in detail with reference to Figure 4. Figure 4 is a schematic diagram showing the first and second modes of the lighting unit. The left side of Figure 4 shows the first mode of the lighting unit. The right side of Figure 4 shows the second mode of the lighting unit.

[0024] In Figure 4, a vehicle (not shown in Figure 4) is traveling along road r1 from the foreground to the depth of the drawing, and a person is assumed to be at the edge of road r1. In Figure 4, the areas of the light distribution region R1 that include the person are defined as target areas R10 and R11. Also in Figure 4, the area of ​​the light distribution region R1 excluding target areas R10 and R11 is defined as the non-target area R20.

[0025] As shown in the left diagram of Figure 4, in the first mode, the lighting control unit 15 (see Figure 1) controls the lighting unit 14 (see Figure 1) to turn off the lights in the target areas R10 and R11 and turn on the lights in the non-target area R20. As a result, from the driver's perspective, the target areas R10 and R11 become relatively darker than the non-target area R20. Therefore, to the driver, as shown in Figure 4, the target areas R10 and R11 appear as if silhouettes are being displayed. This configuration makes it easy for the driver to recognize people located in the target areas R10 and R11.

[0026] For example, when driving on a dimly lit road with few streetlights, it can be difficult for the driver to visually recognize people if parts of their bodies are hidden by grass or if they are wearing inconspicuous clothing. In such situations, setting the lighting unit 14 to the first mode makes it easier for the driver to recognize people.

[0027] As shown in the right diagram of Figure 4, in the second mode, the lighting control unit 15 (see Figure 1) controls the lighting unit 14 (see Figure 1) to illuminate the entire light distribution area R1. As a result, from the driver's perspective, the target areas R10 and R11 and the non-target area R20 have the same brightness. By illuminating the target areas R10 and R11 to the same brightness as the non-target area R20 in this way, the driver can easily visually recognize people located in the target areas R10 and R11.

[0028] For example, when driving on a well-lit road with many streetlights, it is easy for the driver to visually recognize people. In such a situation, setting the lighting unit 14 to the first mode would actually make it more difficult for the driver to visually recognize people. Therefore, by setting the lighting unit 14 to the second mode, it becomes easier for the driver to visually recognize people.

[0029] In this manner, the lighting control unit 15 controls the lighting unit 14 to switch between the first mode and the second mode based on the brightness of the target space. With this configuration, the lighting device 10 allows the driver to appropriately recognize people located outside the vehicle according to the brightness of the target space. In other words, the driver can appropriately recognize people located outside the vehicle according to the driving environment.

[0030] <Lighting control method> Next, the lighting control method according to Embodiment 1 will be described with reference to Figure 5. Figure 5 is a flowchart of the lighting control method according to Embodiment 1. The lighting control method according to Embodiment 1 is a method for controlling the lighting unit (lighting device). In the following, the reference numerals shown in Figure 1 will be used as appropriate.

[0031] First, the imaging unit 11 captures an image of the target space including the light distribution area (step ST1). Next, the identification unit 12 identifies the area containing the person as the target area if the image captured by the imaging unit 11 includes a person (step ST2). Next, the brightness sensor 13 acquires the brightness of the target space (step ST3).

[0032] Next, the lighting control unit 15 determines whether the brightness of the target space is below a threshold (step ST4). If the lighting control unit 15 determines that the brightness of the target space is below a threshold (step ST4; YES), it controls the lighting unit 14 to enter the first mode (step ST5).

[0033] On the other hand, if the lighting control unit 15 determines that the brightness of the target space is not below a threshold (step ST4; NO), it controls the lighting unit 14 to enter the second mode (step ST6).

[0034] In this way, the lighting control method according to Embodiment 1 controls the lighting unit 14 to switch between the first mode and the second mode based on the brightness of the target space. With this configuration, the lighting control method according to Embodiment 1 allows the driver to see a person positioned outside the vehicle appropriately, regardless of the brightness of the target space. In other words, the driver can see a person positioned outside the vehicle appropriately, regardless of the driving environment.

[0035] In the above-described embodiment 1, the lighting device 10 was explained as comprising an imaging unit 11, an identification unit 12, a brightness sensor 13, an illumination unit 14, and an illumination control unit 15. However, it is not limited to this configuration. For example, the lighting device 10 may be configured to communicate with a server, and the processing of the imaging unit 11, identification unit 12, brightness sensor 13, illumination unit 14, and illumination control unit 15 may be distributed between the lighting device 10 and the server. In other words, the processing of the imaging unit 11, identification unit 12, brightness sensor 13, illumination unit 14, and illumination control unit 15 is not limited to being performed by a single device, but may be configured to be performed in a distributed manner using multiple devices. The same applies to embodiments 2 to 7 below.

[0036] (Embodiment 2) <Lighting equipment> A lighting device according to Embodiment 2 will now be described. Figure 6 is a block diagram illustrating a lighting device according to Embodiment 2. As shown in Figure 2, the lighting device 20 includes an imaging unit 11, an identification unit 12, a brightness sensor 13, a lighting unit 14, a lighting control unit 25, and a position information acquisition unit 16. The lighting device 20 is installed, for example, in a vehicle. The lighting device 20 is characterized in that the lighting control unit 25 changes a threshold for controlling the lighting unit 14 based on the position information acquired by the position information acquisition unit 16. Hereinafter, the threshold for controlling the lighting unit 14 by the lighting control unit 25 (a threshold related to the brightness of the target space) will be referred to as the brightness threshold.

[0037] The imaging unit 11, identification unit 12, brightness sensor 13, and illumination unit 14 shown in Figure 6 are the same as in Embodiment 1, so their explanation will be omitted. Here, we will describe the illumination control unit 25 and the position information acquisition unit 16.

[0038] <Location information acquisition section> The location information acquisition unit 16 shown in Figure 6 acquires the location information of the lighting unit 14. For example, if the lighting unit 14 is mounted on a vehicle, the location information acquisition unit 16 may be configured to acquire the vehicle's GPS (Global Positioning System) information.

[0039] <Changing thresholds based on location information> The lighting control unit 25 controls the lighting unit to enter the first mode when the brightness of the target space is below the brightness threshold. The lighting control unit 25 controls the lighting unit to enter the second mode when the brightness of the target space is greater than the brightness threshold. Here, the lighting control unit 25 changes the brightness threshold based on the location information acquired by the location information acquisition unit 16.

[0040] An example of how the lighting control unit 25 changes the brightness threshold will be explained. For example, mountain roads can become dim not only at night but also during the day. When driving on a mountain road, it can be difficult for the driver to visually recognize people if parts of their bodies are hidden by grass or if they are wearing inconspicuous clothing. Therefore, when the location information acquisition unit 16 acquires information that the vehicle is on a mountain road, the lighting control unit 25 lowers the brightness threshold. In other words, the lighting control unit 25 controls the lighting unit 14 to prioritize the first mode. In this way, even when driving on a mountain road, prioritizing the lighting unit 14 to the first mode makes it easier for the driver to recognize people. Although a mountain road was used as an example here, any predetermined area that becomes dim regardless of the time of day, such as a tunnel, may also be used.

[0041] <Database Usage> Here, the location information acquisition unit 16 may be configured to acquire time information along with the location information of the lighting unit 14. For example, the location information acquisition unit 16 may acquire information indicating that it is located on a mountain path at 17:00.

[0042] Referring to Figure 7, an example of how the lighting control unit 25 changes the brightness threshold using a database (map data) will be explained. Figure 7 is a diagram showing an example of map data. As shown in Figure 7, the map data shows the brightness index at each point A, B, and C for each time period. In Figure 7, the brightness index at each point A, B, and C is expressed as "dim" and "bright," but it is not limited to these terms, and illuminance may also be used.

[0043] When changing the brightness threshold using a database, the lighting device 20 may have the following configuration, for example: The lighting device 20 includes a storage unit (not shown in Figure 6), which stores the database (map data). However, it is not limited to this configuration; the lighting device 20 may also be configured to communicate with a server (not shown in Figure 6), with the server storing the database (map data).

[0044] Referring to Figure 7, we will explain an example of changing the brightness threshold using a database. For example, suppose the location information acquisition unit 16 (see Figure 6) acquires information that it is located at point A at 18:00. The lighting control unit 25 refers to the database (map data) shown in Figure 7 based on the information that it is located at point A at 18:00. Then, the lighting control unit 25 acquires information from the database (map data) shown in Figure 7 that point A is dimly lit at 18:00. Therefore, the lighting control unit 25 lowers the brightness threshold. With this configuration, even if the vehicle is driving through point A at 18:00, the lighting device 20 can prioritize setting the lighting unit 14 to the first mode, making it easier for the driver to recognize people.

[0045] On the other hand, suppose the location information acquisition unit 16 (see Figure 6) acquires information that the vehicle is located at point B at 18:00. The lighting control unit 25 then refers to the database (map data) shown in Figure 7 based on the information that the vehicle is located at point B at 18:00. In this case, the lighting control unit 25 acquires information from the database (map data) shown in Figure 7 that point B is bright at 18:00. Therefore, the lighting control unit 25 does not change the brightness threshold. With this configuration, even if the vehicle is driving through point B at 18:00, the lighting device 20 can switch the lighting unit 14 to the second mode. As a result, it becomes easier for the driver to visually recognize people.

[0046] Thus, in the lighting device 20 according to Embodiment 2, the lighting control unit 25 changes the brightness threshold of the target space for controlling the lighting unit 14 based on position information. With this configuration, the lighting device 20 allows the driver to appropriately recognize a person located outside the vehicle, regardless of their current position.

[0047] <Lighting control method> Next, the lighting control method according to Embodiment 2 will be described with reference to Figure 8. Figure 8 is a flowchart of the lighting control method according to Embodiment 2. The lighting control method according to Embodiment 2 is a method for controlling the lighting unit (lighting device). In the following, the reference numerals shown in Figure 6 will be used as appropriate.

[0048] The lighting control method according to Embodiment 2 shown in Figure 8 represents the processing performed between steps ST3 and ST4 of the lighting control method according to Embodiment 1 shown in Figure 5. That is, in the lighting control method according to Embodiment 2, the processing from steps ST1 to ST3 in Figure 5 is executed, the processing from steps ST21 to ST24 in Figure 8 is executed, and the processing from steps ST4 to ST6 in Figure 5 is executed. Here, the processing from steps ST21 to ST24 in Figure 8 will be explained.

[0049] First, as shown in Figure 8, the location information acquisition unit 16 acquires the location information of the lighting unit 14 (step ST21). Next, the lighting control unit 25 determines whether the location information of the lighting unit 14 is within a predetermined area (step ST22). The predetermined area is, for example, an area that becomes dim regardless of the time of day, such as a mountain road or a tunnel.

[0050] Next, if the lighting control unit 25 determines that the position information of the lighting unit 14 is within a predetermined area (step ST22; YES), it changes the brightness threshold (step ST23). For example, the lighting control unit 25 lowers the brightness threshold.

[0051] On the other hand, if the lighting control unit 25 determines that the position information of the lighting unit 14 is not within a predetermined area (step ST22; NO), it does not change the brightness threshold (step ST24).

[0052] Thus, in the lighting control method according to Embodiment 2, the brightness threshold for controlling the lighting unit 14 is changed based on position information. With this configuration, the lighting control method according to Embodiment 2 allows the driver to appropriately recognize a person located outside the vehicle, regardless of their position.

[0053] (Embodiment 3) <Lighting equipment> A lighting device according to Embodiment 3 will now be described. Figure 9 is a block diagram illustrating a lighting device according to Embodiment 3. As shown in Figure 2, the lighting device 30 includes an imaging unit 11, an identification unit 12, a brightness sensor 13, a lighting unit 14, a lighting control unit 35, and a people measurement unit 17. The lighting device 20 is installed, for example, in a vehicle. The lighting device 20 is characterized in that the lighting control unit 35 changes a brightness threshold for controlling the lighting unit 14 based on the number of people acquired by the people measurement unit 17.

[0054] The imaging unit 11, identification unit 12, brightness sensor 13, and illumination unit 14 are the same as in Embodiment 1, so their description will be omitted. Here, the illumination control unit 35 and the people measurement unit 17 will be described.

[0055] <Person Counting Department> The people counting unit 17 measures the number of people in a designated space. The people counting unit 17 transmits information regarding the number of people in the predetermined space to the lighting control unit 35. The people counting unit 17 is, for example, a radar and measures the number of people in the predetermined space. The predetermined space is a space within a predetermined range set in advance. The people counting unit 17 may, for example, measure the number of people in the target space based on the image from the imaging unit 11.

[0056] <Changing the threshold based on the number of people in the target space> The lighting control unit 35 controls the lighting unit to enter the first mode when the brightness of the target space is below the brightness threshold. The lighting control unit 35 controls the lighting unit to enter the second mode when the brightness of the target space is greater than the brightness threshold. Here, the lighting control unit 35 changes the brightness threshold based on the number of people acquired by the people measurement unit 17.

[0057] An example of how the lighting control unit 35 changes the brightness threshold will be described. For example, when driving on a busy road, the proportion of the target area may be greater than the non-target area. In such cases, if the lighting unit 14 is set to the first mode, the area in front of the vehicle will become too dark for the driver to see people clearly. In addition, the increased darkness in front of the vehicle increases the likelihood of accidents.

[0058] Therefore, if the number of people in the target space is greater than or equal to a predetermined number as determined by the people measurement unit 17, the lighting control unit 35 raises the brightness threshold. In other words, the lighting control unit 35 controls the lighting unit 14 to preferentially enter the second mode. With this configuration, even when driving on a busy road, the lighting unit 14 is preferentially entered into the second mode, making it easier for the driver to visually recognize people.

[0059] On the other hand, when driving on a road with little pedestrian traffic, the proportion of the target area is smaller than the non-target area. In this case, setting the lighting unit 14 to the first mode makes it easier for the driver to recognize people. Therefore, if the number of people in the target space measured by the people measurement unit 17 is less than a predetermined number, the lighting control unit 35 does not change the brightness threshold.

[0060] Furthermore, if the number of people in the target space measured by the people measurement unit 17 is less than a predetermined number, the lighting control unit 35 may lower the brightness threshold. In other words, the lighting control unit 35 controls the lighting unit 14 to preferentially enter the first mode. With this configuration, it becomes easier for the driver to recognize people even when driving on roads with little pedestrian traffic.

[0061] The predetermined number of people that the lighting control unit 35 uses as a basis for changing the brightness threshold can be determined arbitrarily. Alternatively, the lighting control unit 35 may determine the predetermined number of people based on statistical data showing the proportion of the target area that occupies the light distribution area relative to the number of people in the target space. For example, statistical data showing the proportion of the target area that occupies the light distribution area relative to the number of people in the target space may show that if 10 people are in the target space, half of the light distribution area will be the target area.

[0062] Thus, in the lighting device 30 according to Embodiment 3, the lighting control unit 35 changes the brightness threshold for controlling the lighting unit 14 based on the number of people in the target space. With this configuration, the lighting device 20 allows the driver to appropriately recognize people located outside the vehicle, regardless of whether the road being driven on is busy or quiet.

[0063] <Lighting control method> Next, the lighting control method according to Embodiment 3 will be described with reference to Figure 10. Figure 10 is a flowchart of the lighting control method according to Embodiment 3. The lighting control method according to Embodiment 3 is a method for controlling the lighting unit (lighting device). Hereafter, the reference numerals shown in Figure 9 will be used as appropriate.

[0064] The lighting control method according to Embodiment 3 shown in Figure 10 represents the processing performed between steps ST3 and ST4 of the lighting control method according to Embodiment 1 shown in Figure 5. That is, in the lighting control method according to Embodiment 3, the processing from steps ST1 to ST3 in Figure 5 is executed, the processing from steps ST31 to ST34 in Figure 10 is executed, and the processing from steps ST4 to ST6 in Figure 5 is executed. Here, the processing from steps ST31 to ST34 in Figure 10 will be explained.

[0065] First, as shown in Figure 10, the people counting unit 17 measures the number of people in the target space (Step ST31). Next, the lighting control unit 35 determines whether the number of people in the target space is equal to or greater than a predetermined number (Step ST32).

[0066] Next, if the lighting control unit 35 determines that the number of people in the target space is greater than or equal to a predetermined number (step ST32; YES), it changes the brightness threshold (step ST33). For example, the lighting control unit 35 increases the brightness threshold.

[0067] On the other hand, if the lighting control unit 25 determines that the number of people in the target space is not equal to or greater than a predetermined number (step ST32; NO), it does not change the brightness threshold (step ST34). In step ST34 shown in Figure 10, the brightness threshold is not changed, but it may also be configured to lower the brightness threshold.

[0068] Thus, in the lighting control method according to Embodiment 3, the brightness threshold of the target space for controlling the lighting unit 14 is changed based on the number of people in the target space. With this configuration, in the lighting control method according to Embodiment 3, the driver can appropriately recognize people located outside the vehicle, regardless of whether there are many or few people on the road being driven on.

[0069] <Contrast-based control of the lighting unit> Here, the lighting devices 10 to 30 according to embodiments 1 to 3 may control the lighting unit according to the contrast of the target area in the first mode and the contrast of the non-target area in the first mode. This will be explained in detail with reference to Figure 11. Figure 11 is a schematic diagram showing the target area and the non-target area. The left side of Figure 11 shows the first mode of the lighting unit. The right side of Figure 11 shows the second mode of the lighting unit.

[0070] In the left diagram of Figure 11, the difference between the contrast of the target areas R50 and R51 and the contrast of the non-target area R53 is below a predetermined value. Therefore, in the left diagram of Figure 11, it is difficult for the driver to recognize the silhouettes of the target areas R50 and R51.

[0071] In this case, the lighting control unit controls the lighting unit to switch from the first mode (left diagram in Figure 11) to the second mode (right diagram in Figure 11). As a result, from the driver's perspective, the target areas R50 and R51 and the non-target area R53 will have the same brightness. Therefore, it becomes easier for the driver to visually confirm a person located in the target areas R50 and R51.

[0072] Here, when the light intensity of the illumination unit decreases, the difference in contrast between the target area and the non-target area tends to decrease. The difference in contrast between the target area and the non-target area is determined by the light intensity of the illumination unit. Therefore, the illumination control unit may control the illumination unit to switch from the first mode to the second mode when the light intensity of the illumination unit falls below a predetermined value.

[0073] For example, if the lighting unit consists of multiple LED lights, the lighting control unit may determine the light intensity of the lighting unit based on the number of LED lights that are lit. Let's take the case where the lighting unit consists of 100 LED lights as an example. If 50 of the 100 LED lights in the lighting unit are lit and 50 are off, the lighting control unit determines that the light intensity of the lighting unit is 50%. Then, if the predetermined value for light intensity is 60%, the lighting control unit controls the lighting unit to switch from the first mode to the second mode because the light intensity of the lighting unit is below the predetermined value.

[0074] On the other hand, if the difference between the contrast of the target areas R50 and R51 shown in the left diagram of Figure 11 and the contrast of the non-target area R53 is greater than a predetermined value, the lighting control unit controls the lighting unit to continue the first mode (left diagram of Figure 11).

[0075] In Figure 11, an example was illustrated in which the lighting control unit controls the lighting unit to switch from the first mode to the second mode when the difference in contrast between the target area and the non-target area is less than or equal to a predetermined value in the first mode. However, the control unit is not limited to this, and the lighting control unit may also control the lighting unit to switch from the first mode to the second mode when the ratio of the contrast of the target area to the contrast of the non-target area is less than or equal to a predetermined value in the first mode. The ratio of the contrast of the target area to the contrast of the non-target area is determined by the light intensity of the lighting unit. For example, if the lighting unit consists of multiple LED lights, the lighting control unit may determine the light intensity of the lighting unit based on the number of LED lights that are lit in the lighting unit. Let's take the case where the lighting unit consists of 100 LED lights as an example. If 50 of the 100 LED lights in the lighting unit are lit and 50 are off, the lighting control unit calculates 1 as 50 lit LED lights / 50 off LED lights. Then, if the predetermined value of the light intensity is set to 1.5, the lighting control unit controls the lighting unit to switch from the first mode to the second mode because the ratio of the light intensity of the lighting unit is below the predetermined value. In other words, the lighting control unit only needs to control the lighting unit based on the contrast of the target area in the first mode and the contrast of the non-target area in the first mode.

[0076] As described above, the lighting devices 10 to 30 according to embodiments 1 to 3 control the lighting unit to switch from the first mode to the second mode when the difference in contrast between the target area and the non-target area is less than or equal to a predetermined value in the first mode. This allows the target area and the non-target area to be illuminated with the same brightness when the difference in contrast between the target area and the non-target area is small and it is difficult for the driver to recognize a person. Therefore, the driver can appropriately recognize a person located outside the vehicle regardless of the light intensity of the lighting unit.

[0077] (Embodiment 4) <Lighting equipment> A lighting device according to Embodiment 4 will now be described. Figure 12 is a block diagram illustrating a lighting device according to Embodiment 4. As shown in Figure 12, the lighting device 40 comprises an imaging unit 11, an identification unit 12, a people measurement unit 43, a lighting unit 14, and a lighting control unit 45. The lighting device 40 is installed, for example, in a vehicle. The lighting device 40 is characterized by controlling the lighting unit 14 to switch between a first mode and a second mode based on the number of people included in the target space.

[0078] The imaging unit 11, identification unit 12, and illumination unit 14 are the same as in Embodiment 1, so their description is omitted. Also, the people measurement unit 43 is the same as the people measurement unit 17 in Embodiment 3, so its description is omitted. Here, the illumination control unit 45 will be described.

[0079] <Lighting Control Unit> The lighting control unit 45 controls the lighting unit 14 to switch between a first mode and a second mode based on the number of people in the target space. More specifically, the lighting control unit 45 controls the lighting unit to enter the first mode when the number of people in the target space is below a threshold. The lighting control unit 45 controls the lighting unit to enter the second mode when the number of people in the target space is greater than the threshold.

[0080] For example, when driving on a road with little pedestrian traffic, if the lighting unit 14 is set to the second mode, the entire target area and non-target area are illuminated equally, making it difficult for the driver to visually recognize people in the target area. Therefore, the lighting control unit 45 controls the lighting unit to switch to the first mode when the number of people in the target space is below a threshold. As a result, the lighting unit 14 turns off the lights in the target area and illuminates the lights in the non-target area. The driver then perceives the target area as if it were a silhouette, making it easier for the driver to recognize people.

[0081] For example, when driving on a busy road, if the lighting unit 14 is set to the first mode, the area in front of the vehicle becomes too dark for the driver to see people clearly. Furthermore, the increased darkness in front of the vehicle increases the likelihood of accidents. Therefore, the lighting control unit 45 controls the lighting unit to switch to the second mode when the number of people in the target area exceeds a threshold. This ensures that the lighting unit 14 illuminates both the target and non-target areas evenly. Thus, it becomes easier for the driver to see people clearly.

[0082] In this way, the lighting control unit 45 controls the lighting unit 14 to switch between the first mode and the second mode based on the number of people in the target space. With this configuration, the lighting device 40 allows the driver to properly recognize people located outside the vehicle, regardless of the number of people in the target space. In other words, the driver can properly recognize people located outside the vehicle, regardless of the driving environment.

[0083] The threshold value in the lighting control unit 45 can be determined arbitrarily. Alternatively, the lighting control unit 45 may determine the threshold value for the number of people based on statistical data showing the proportion of the target area that occupies the light distribution area relative to the number of people in the target space. For example, statistical data showing the proportion of the target area that occupies the light distribution area relative to the number of people in the target space might indicate that if 10 people are in the target space, half of the light distribution area will be the target area.

[0084] <Lighting control method> Next, the lighting control method according to Embodiment 4 will be described with reference to Figure 13. Figure 13 is a flowchart of the lighting control method according to Embodiment 4. The lighting control method according to Embodiment 4 is a method for controlling the lighting unit (lighting device). In the following, the reference numerals shown in Figure 12 will be used as appropriate.

[0085] First, the imaging unit 11 images the target space including the light distribution area (step ST1). Next, the identification unit 12 identifies the area containing the person as the target area if the image captured by the imaging unit 11 includes a person (step ST2). Steps ST1 and ST2 shown in Figure 13 are the same as steps ST1 and ST2 of the illumination control method according to Embodiment 1 shown in Figure 5.

[0086] Next, the people measurement unit 43 measures the number of people in the target space (step ST301). Then, the lighting control unit 45 determines whether the number of people in the target space is below a threshold (step ST41).

[0087] If the lighting control unit 15 determines that the number of people in the target space is below a threshold (step ST41; YES), it controls the lighting unit 14 to enter the first mode (step ST42).

[0088] On the other hand, if the lighting control unit 15 determines that the number of people in the target space is not below a threshold (step ST41; NO), it controls the lighting unit 14 to enter the second mode (step ST43).

[0089] Thus, in the lighting control method according to Embodiment 4, the lighting unit 14 is controlled to switch between the first mode and the second mode based on the number of people in the target space. With this configuration, in the lighting control method according to Embodiment 4, the driver can appropriately recognize people located outside the vehicle regardless of the number of people in the target space. In other words, the driver can appropriately recognize people located outside the vehicle regardless of the driving environment.

[0090] In the example shown in Figure 12, the lighting device 40 is configured to include a people counting unit 43, but it is not limited to this configuration, and the lighting device 40 does not need to include a people counting unit 43. That is, the lighting device 40 and a people counting unit located outside the lighting device 40 can communicate with each other, and the lighting device 40 may obtain information about the number of people included in the target space by receiving it from the people counting unit located outside the lighting device 40.

[0091] (Embodiment 5) <Lighting equipment> A lighting device according to Embodiment 5 will now be described. Figure 14 is a block diagram illustrating a lighting device according to Embodiment 5. As shown in Figure 14, the lighting device 50 includes an imaging unit 11, an identification unit 12, a people measurement unit 43, a lighting unit 14, a lighting control unit 45, and a location information acquisition unit 18. The lighting device 50 is installed, for example, in a vehicle. The lighting device 50 is characterized in that the lighting control unit 55 changes a threshold for controlling the lighting unit 14 based on the location information acquired by the location information acquisition unit 18. Hereinafter, the threshold for controlling the lighting unit 14 by the lighting control unit 55 (a threshold related to the number of people included in the target space) will be referred to as the people threshold.

[0092] The imaging unit 11, identification unit 12, and illumination unit 14 are the same as in Embodiment 1, so their description is omitted. The person counting unit 43 is the same as the person counting unit 17 in Embodiment 3, so its description is omitted. Furthermore, the location information acquisition unit 18 is the same as the location information acquisition unit 16 in Embodiment 2, so its description is omitted. Here, the illumination control unit 55 will be described.

[0093] <Changing thresholds based on location information> The lighting control unit 55 controls the lighting unit to enter the first mode if the number of people in the target space is less than or equal to the number threshold. The lighting control unit 55 controls the lighting unit to enter the second mode if the number of people in the target space is greater than the number threshold. Here, the lighting control unit 55 changes the number threshold based on the location information acquired by the location information acquisition unit 18.

[0094] An example of how the lighting control unit 55 changes the threshold for the number of people in the target space will be explained. For example, mountain roads may have fewer people than general roads, not only at night but also during the day. When driving on a mountain road, if part of a person's body is hidden in the shade of grass or if someone is wearing inconspicuous clothing, it will be more difficult for the driver to visually recognize people on the mountain road compared to a general road, even if there are few people on the mountain road. Therefore, when the location information acquisition unit 18 acquires information that the vehicle is located on a mountain road, the lighting control unit 55 lowers the threshold for the number of people. In other words, the lighting control unit 55 controls the lighting unit 14 to preferentially enter the first mode. With this configuration, even when driving on a mountain road, by preferentially entering the first mode for the lighting unit 14, it becomes easier for the driver to recognize people. Although a mountain road was used as an example here, any predetermined area with few people even during the day, such as a tunnel, may also be used.

[0095] Furthermore, the lighting control unit 55 may be configured to change the person threshold using the database (map data) shown in Figure 7. The configuration in which the lighting control unit 55 changes the person threshold using the database is the same as the case in which the brightness threshold is changed as described above, so the explanation is omitted here.

[0096] Thus, in the lighting device 50 according to Embodiment 5, the lighting control unit 55 changes the threshold number of people included in the target space for controlling the lighting unit 14 based on location information. With this configuration, the lighting device 50 allows the driver to appropriately recognize people located outside the vehicle, regardless of their current position.

[0097] <Lighting control method> Next, the lighting control method according to Embodiment 5 will be described with reference to Figure 15. Figure 15 is a flowchart of the lighting control method according to Embodiment 5. The lighting control method according to Embodiment 5 is a method for controlling the lighting unit (lighting device). In the following, the reference numerals shown in Figure 14 will be used as appropriate.

[0098] The lighting control method according to Embodiment 5 shown in Figure 15 represents the processing performed between steps ST301 and ST41 of the lighting control method according to Embodiment 4 shown in Figure 13. That is, in the lighting control method according to Embodiment 5, the processing from steps ST1 to ST301 in Figure 13 is executed, the processing from steps ST51 to ST54 in Figure 15 is executed, and the processing from steps ST41 to ST43 in Figure 13 is executed. Here, the processing from steps ST51 to ST54 in Figure 15 will be explained.

[0099] First, as shown in Figure 15, the position information acquisition unit 18 acquires the position information of the lighting unit 14 (step ST51). Next, the lighting control unit 55 determines whether the position information of the lighting unit 14 is within a predetermined area (step ST52). The predetermined area is, for example, an area that becomes dim regardless of the time of day, such as a mountain road or a tunnel.

[0100] Next, if the lighting control unit 25 determines that the position information of the lighting unit 14 is within a predetermined area (step ST52; YES), it changes the number of people threshold (step ST53). For example, the lighting control unit 55 lowers the number of people threshold.

[0101] On the other hand, if the lighting control unit 55 determines that the position information of the lighting unit 14 is not within a predetermined area (step ST52; NO), it does not change the number threshold (step ST54).

[0102] Thus, in the lighting control method according to Embodiment 5, the threshold number of people included in the target space for controlling the lighting unit 14 is changed based on position information. With this configuration, in the lighting control method according to Embodiment 5, the driver can appropriately recognize people located outside the vehicle at any position.

[0103] (Embodiment 6) <Lighting equipment> A lighting device according to Embodiment 6 will now be described. Figure 16 is a block diagram illustrating a lighting device according to Embodiment 6. As shown in Figure 16, the lighting device 60 includes an imaging unit 11, an identification unit 12, a people measurement unit 43, a lighting unit 14, a lighting control unit 65, and a brightness sensor 19. The lighting device 60 is installed, for example, in a vehicle. The lighting device 60 is characterized in that the lighting control unit 65 changes the people threshold for controlling the lighting unit 14 based on the brightness of the target space acquired by the brightness sensor 19.

[0104] The imaging unit 11, identification unit 12, and illumination unit 14 are the same as in Embodiment 1, so their description is omitted. The person counting unit 43 is the same as the person counting unit 17 in Embodiment 3, so its description is omitted. Furthermore, the brightness sensor 19 is the same as the brightness sensor 13 in Embodiment 1, so its description is omitted. Here, the illumination control unit 65 will be described.

[0105] <Changing the threshold based on the brightness of the target space> The lighting control unit 65 controls the lighting unit to enter the first mode if the number of people in the target space is less than or equal to the number threshold. The lighting control unit 65 controls the lighting unit to enter the second mode if the number of people in the target space is greater than the number threshold. Here, the lighting control unit 65 changes the number threshold based on the brightness of the target space acquired by the brightness sensor 19.

[0106] For example, when driving on a well-lit road with many streetlights, it is easy for the driver to visually recognize people. In such a situation, setting the lighting unit 14 to the first mode would actually make it more difficult for the driver to visually recognize people. Therefore, if the brightness of the target space acquired by the brightness sensor 19 is above a predetermined value, the lighting control unit 65 raises the threshold for the number of people. In other words, the lighting control unit 65 controls the lighting unit 14 to preferentially enter the second mode. This configuration makes it easier for the driver to visually recognize people.

[0107] For example, when driving on a dimly lit road with few streetlights, it is difficult for the driver to visually recognize people. Therefore, if the brightness of the target space acquired by the brightness sensor 19 is less than a predetermined value, the lighting control unit 65 lowers the threshold for the number of people. In other words, the lighting control unit 65 controls the lighting unit 14 to preferentially enter the first mode. This configuration makes it easier for the driver to recognize people. Here, an example has been described in which the lighting control unit 65 lowers the threshold for the number of people included in the target space, but it is not limited to this, and a configuration that does not change the threshold for the number of people included in the target space is also possible.

[0108] Thus, in the lighting device 60 according to Embodiment 6, the lighting control unit 65 changes the threshold for the number of people to control the lighting unit 14 based on the brightness of the target space. With this configuration, the driver can appropriately recognize people located outside the vehicle regardless of the brightness of the target space in the lighting device 20.

[0109] <Lighting control method> Next, the lighting control method according to Embodiment 6 will be described with reference to Figure 17. Figure 17 is a flowchart of the lighting control method according to Embodiment 6. The lighting control method according to Embodiment 6 is a method for controlling the lighting unit (lighting device). In the following, the reference numerals shown in Figure 16 will be used as appropriate.

[0110] The lighting control method according to Embodiment 6 shown in Figure 17 represents the processing performed between steps ST301 and ST41 of the lighting control method according to Embodiment 4 shown in Figure 13. That is, in the lighting control method according to Embodiment 6, the processing from steps ST1 to ST301 in Figure 13 is executed, the processing from steps ST61 to ST64 in Figure 17 is executed, and the processing from steps ST41 to ST43 in Figure 13 is executed. Here, the processing from steps ST61 to ST64 in Figure 17 will be explained.

[0111] First, as shown in Figure 17, the brightness sensor 19 acquires the brightness of the target space (step ST61). Next, the lighting control unit 65 determines whether the brightness of the target space is above a predetermined value (step ST62).

[0112] Next, if the lighting control unit 65 determines that the brightness of the target space is above a predetermined value (step ST62; YES), it changes the number of people threshold (step ST63). For example, the lighting control unit 55 increases the number of people threshold.

[0113] On the other hand, if the lighting control unit 65 determines that the brightness of the target space is not above a predetermined value (step ST62; NO), it does not change the number of people threshold (step ST54). Here, it has been explained that the lighting control unit 65 does not change the number of people threshold, but the lighting control unit 65 may lower the number of people threshold.

[0114] Thus, in the lighting control method according to Embodiment 6, the threshold number of people included in the target space for controlling the lighting unit 14 is changed based on the brightness of the target space. With this configuration, in the lighting control method according to Embodiment 6, the driver can appropriately recognize people located outside the vehicle regardless of the brightness of the target space.

[0115] <Control of the lighting unit based on the ratio of the target area to the light distribution area> Here, the lighting devices 40 to 60 according to embodiments 4 to 6 may control the lighting unit according to the ratio of the target area to the light distribution area in the first mode. This will be explained in detail with reference to Figure 18. Figure 18 is a schematic diagram showing the target area and the non-target area. The left side of Figure 18 shows the first mode of the lighting unit. The right side of Figure 18 shows the second mode of the lighting unit.

[0116] In the left diagram of Figure 18, the target area R60 is assumed to occupy 40% of the light distribution area R1. In the left diagram of Figure 18, the driver perceives the target area R60 as if a silhouette is displayed, resulting in a large portion of their field of vision being dark. This increases the likelihood of an accident.

[0117] In this case, the lighting control unit controls the lighting unit to switch from the first mode (left diagram in Figure 18) to the second mode (right diagram in Figure 18). As a result, from the driver's perspective, the target area R60 and the non-target area R62 will have the same brightness. Therefore, it becomes easier for the driver to visually recognize a person located in the target area R60.

[0118] Figure 18 illustrates an example in which the lighting control unit controls the lighting unit to switch from the first mode to the second mode when the ratio of the target area to the light distribution area in the first mode is 40%. However, it is not limited to this; the lighting control unit only needs to control the lighting unit to switch from the first mode to the second mode when the ratio of the target area to the light distribution area in the first mode is greater than or equal to a predetermined value.

[0119] Note that in Figure 18, for the sake of simplicity, the light distribution region and the division region were described as two-dimensional regions. In reality, the light distribution region and the division region are three-dimensional regions. Therefore, the ratio of the target region to the light distribution region can also be said to be the ratio indicating what extent the space representing the target region occupies the space representing the light distribution region.

[0120] As described above, the lighting devices 40 to 60 according to embodiments 4 to 6 control the lighting unit to switch from the first mode to the second mode when the ratio of the target area to the light distribution area is greater than or equal to a predetermined value in the first mode. This allows the target area and non-target area to be illuminated with the same brightness when the field of view is dark due to the target area and it is difficult for the driver to visually recognize a person. Therefore, the driver can appropriately recognize a person located outside the vehicle regardless of the ratio of the target area to the light distribution area.

[0121] (Embodiment 7) <Shielding object> A lighting device according to Embodiment 7 will now be described. Figure 19 is a block diagram illustrating a lighting device according to Embodiment 7. As shown in Figure 19, the lighting device 200 includes an imaging unit 11, a radar 100, an identification unit 101, a lighting unit 14, and a lighting control unit 95. The lighting device 200 is characterized by controlling the lighting unit so that when an obstruction prevents a person from seeing the object with their eyes, the obstruction is displayed as if it were a silhouette.

[0122] The imaging unit 11 and illumination unit 14 are the same as in Embodiment 1, so their description will be omitted. Here, we will describe the radar 100, identification unit 101, and illumination control unit 95.

[0123] The radar 100 detects people and obstacles within the target space, including the light distribution area. The radar 100 transmits the detection result to the identification unit 101.

[0124] The identification unit 101 receives detection results from the radar 100. The identification unit 101 also receives an image of the target space, including the light distribution area, from the imaging unit 11. If the detection results from the radar 100 include a person, but the image captured by the imaging unit 11 does not include a person, the identification unit 101 identifies the area containing the obstruction as the target area from the image. The identification unit 101 also identifies the area of ​​the light distribution area excluding the target area as the non-target area.

[0125] On the other hand, if the detection result of the radar 100 includes a person and the image captured by the imaging unit 11 also includes a person, the identification unit 101 identifies the area containing the person as the target area from the image. In other words, the identification unit 101 identifies the area containing an obstruction or the area containing a person as the target area based on the detection result from the radar 100 and the image from the imaging unit 11.

[0126] The lighting control unit 95 controls the lighting unit 14 to switch between the first mode and the second mode based on the detection results from the radar 100 and the image from the imaging unit 11. More specifically, the lighting control unit 95 controls the lighting unit 14 to enter the first mode when the detection results from the radar 100 include a person, but the image captured by the imaging unit 11 does not include a person. As a result, the area including the obstruction, which is the target area, is turned off, and the non-target area is turned on. Therefore, even if a person is behind an obstruction such as a wall or bush and cannot be seen by the driver, the obstruction is displayed as a silhouette, so the driver can recognize that there is a person near the obstruction.

[0127] On the other hand, the lighting control unit 95 controls the lighting unit 14 to switch to the second mode if the radar 100's detection result includes a person and the image captured by the imaging unit 11 also includes a person. As a result, the area containing the person (the target area) and the non-target area are illuminated. In other words, if the person is not hidden by an obstacle, switching to the second mode makes it easier for the driver to visually recognize the person.

[0128] Furthermore, some or all of the processing in the lighting devices 10-60, 200 and the lighting control method described above can be implemented as a computer program. Such a program can be stored using various types of non-temporary computer-readable media and supplied to a computer. Non-temporary computer-readable media include various types of tangible recording media. Examples of non-temporary computer-readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / Ws, and semiconductor memories (e.g., mask ROMs, PROMs (Programmable ROMs), EPROMs (Erasable PROMs), flash ROMs, and RAMs (Random Access Memory)). Programs may also be supplied to a computer by various types of temporary computer-readable media. Examples of temporary computer-readable media include electrical signals, optical signals, and electromagnetic waves. Temporary computer-readable media can be supplied to a computer via wired communication channels such as electric wires and optical fibers, or via wireless communication channels.

[0129] Although the present disclosure has been described in accordance with the above embodiments, the present disclosure is not limited to the configuration of the above embodiments, and of course includes various modifications, alterations, and combinations that a person skilled in the art could make within the scope of the claims of the present patent application. [Explanation of Symbols]

[0130] 10, 20, 30, 40, 50, 60, 200 lighting devices 11 Imaging Unit 12, 101 Identification section 13, 19 Brightness sensor 14 Lighting Section 15, 25, 35, 45, 55, 65, 95 Lighting Control Unit 16, 18 Location information acquisition section 17, 43 People counting section 100 radar DR1 split area DR2, DR3 area r1 Road R1 Light distribution area Target areas for R10, R50, and R60 R20, R51, R53, R62 Non-applicable areas

Claims

1. A lighting unit that divides the light distribution area into multiple sections, and allows the brightness of each section to be changed. An imaging unit that images the target space including the aforementioned light distribution area, When an image captured by the imaging unit includes a person, the identification unit identifies the area including the person as the target area, A lighting control unit controls the lighting unit so as to turn off the target area within the light distribution area and turn on the non-target area within the light distribution area excluding the target area, based on the brightness of the target space. Equipped with, Lighting device.

2. Furthermore, it includes a location information acquisition unit that acquires location information of the lighting unit, The aforementioned lighting control unit, The lighting unit is controlled to enter a first mode in which, when the brightness of the target space is below a threshold, the target area of ​​the light distribution area is turned off and the non-target area of ​​the light distribution area excluding the target area is turned on. The lighting unit is controlled to enter a second mode in which the entire light distribution area is illuminated when the brightness of the target space is greater than a threshold. Based on the position information, the threshold is changed. The lighting device according to claim 1.

3. Furthermore, it includes a people counting unit that measures the number of people included in the target space, The lighting control unit changes the threshold based on the number of people measured by the people measurement unit. The lighting device according to claim 2.

4. The lighting control unit controls the lighting unit to switch from the first mode to the second mode when the difference between the contrast of the target area and the contrast of the non-target area is less than or equal to a predetermined value in the first mode. The lighting device according to claim 2 or 3.

5. The target space, including the light distribution area of ​​the lighting device, is imaged. If a person is included in the captured image, the region containing the person is identified as the target region. Based on the brightness of the target space, the lighting device is controlled to turn off the target area within the light distribution area and to turn on the non-target area within the light distribution area excluding the target area. The computer performs the process. Lighting control method.

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