JP2013008453A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system that can enhance human's psychological amenity.SOLUTION: A lighting system has lighting equipment 11 that is provided in a room R and irradiates the inside of the room R with light, a face recognizing sensor for imaging at least an irradiation area (room R) of the lighting equipment, and a calculator for detecting the direction of a human's eye line in image information (image data) from the image information (image data) of the irradiation area (room R) imaged by the face recognizing sensor. The lighting system further has a controller for controlling the lighting equipment so that the brightness of light in a range S2 located on the circumference in the eye line direction is relatively higher than the brightness of light in a range S1 located at the center side in the eye line direction.

Description

  The present invention relates to a lighting system.

  2. Description of the Related Art Conventionally, a technique has been proposed that realizes a lighting environment suitable for work while controlling the light emission output of a lighting device (lighting fixture) and detecting energy by detecting the position of a person and the face in a room. (For example, refer to Patent Document 1).

  The illumination device of Patent Document 1 is an illumination system that includes an image sensor. In this illumination system, the direction of the line of sight is detected from the face state (orientation), and when the person moves, the front area is brightened. If it is determined that the visual work state is still fine, the hand is brightened.

JP 2010-123373 A

  By the way, in the lighting system as described above, the brightness is ensured in accordance with the work such as the moving direction and the visual work state. However, in recent years, the development of the lighting system capable of improving psychological comfort. Is desired.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an illumination system capable of improving human psychological comfort.

  In order to solve the above-described problems, an illumination system of the present invention is provided in a room and illuminates the room with light, an image sensor that captures at least an irradiation area of the luminaire, and the image sensor. A line-of-sight detection unit that detects the line-of-sight direction of the person in the image information from the image information in the irradiated region, and a control unit that controls the lighting apparatus based on the line-of-sight direction detected by the line-of-sight detection unit, The control unit controls the luminaire so that the luminance of light positioned around the eye direction is relatively higher than the luminance of light positioned on the center side of the eye direction.

The said structure WHEREIN: It is preferable that a control part controls the said lighting fixture so that the illumination intensity out of the visual field which remove | deviated from the said person's gaze direction becomes lower than the said gaze direction position.
In the above configuration, the control unit sets the position on the center side in the line of sight to a range of 30 degrees horizontally from the center of the line of sight, and positions around the line of sight in the range of 30 degrees to 100 degrees horizontally from the center of the line of sight It is preferable to control the lighting fixture.

In the above configuration, it is preferable that at least one luminaire is provided for each corner portion in the room.
The said structure WHEREIN: It is preferable that the lighting fixture was equipped with the several light source, and the said light source was comprised so that the corner part of the said room might be irradiated.

  ADVANTAGE OF THE INVENTION According to this invention, the lighting system which can improve a person's psychological comfort can be provided.

(A) (b) is explanatory drawing for demonstrating the illumination system of this embodiment. It is a block diagram for demonstrating schematic structure of an illumination system. It is explanatory drawing for demonstrating a human visual field. It is explanatory drawing for demonstrating evaluation experiment. (A)-(c) is explanatory drawing for demonstrating the illumination system in another example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the lighting system of the present embodiment includes a lighting fixture 11, a control unit 12 that performs lighting control such as power on / off and dimming of the lighting fixture 11, and a human detection unit 13. Prepare.

  As shown in FIGS. 1A and 1B, the luminaire 11 is attached to, for example, the ceiling R1 of the room R and irradiates light on the lower side (the floor side of the room R). A total of four are provided, one for each corner of the ceiling R1, so as to irradiate one corner R2.

The control unit 12 is electrically connected to the lighting fixture 11 as shown in FIG. 2, and performs lighting control based on a detection signal from a human detection unit 13 described later.
The human detection unit 13 includes a calculation unit 21 electrically connected to the control unit 12, a human detection sensor 22 including an image sensor, and a face recognition sensor 23.

The human detection sensor 22 includes an image sensor such as an infrared image sensor, a CCD image sensor, or a CMOS image sensor, and outputs measurement information (image data) to the calculation unit 21.
The face recognition sensor 23 includes an image sensor such as an infrared image sensor, a CCD image sensor, or a CMOS image sensor, and outputs a measurement result (image data) to the calculation unit 21.

  The calculation unit 21 is configured by a microcomputer system, and determines whether or not the person H (see FIG. 2) exists based on the detection result of the person detection sensor 22. The computing unit 21 performs human detection using, for example, a background difference method or an inter-frame difference method as a person detection method. The background subtraction method extracts a difference between a reference image (background image) in a state where there is no person in the room and an evaluation image obtained by imaging the room regardless of the presence of a person, and binarizes the detection area (indoor). A person can be detected. On the other hand, the inter-frame difference method makes it possible to detect a person in a detection area (indoor) by taking a difference between an input image at a certain time t and an input image at a time (t + n).

  In addition, when a person is detected by the person detection method, the calculation unit 21 subsequently determines the direction of the person's face and line of sight. As a method of calculating the direction of the line of sight (line of sight) in the calculation unit 21, the movement direction of the person is set as the line of sight direction S (see FIG. 3), for example, as disclosed in JP 2010-123373 A (Patent Document 1) and the like. To detect (estimate) using a method that can be used.

  2 and 3, the calculation unit 21 detects the eye direction S, and then, after the eye direction S, an angle θ1 of 30 degrees horizontal (center side of the eye direction S) and the horizontal 30 A range S <b> 2 of an angle θ <b> 2 (periphery side of the eye-gaze direction S, which is a guide visual field) of 100 degrees to 100 degrees is calculated. And the calculating part 21 determines the lighting state of the lighting fixture 11 of the range S2 of the angle (theta) 2 which is the range of the gaze direction S periphery position, and the range S1 of the angle (theta) 1 which is the range of the gaze direction S center side. Specifically, the calculation unit 21 turns on the output of the luminaire 11 in the peripheral direction of the eye direction S (range S2) relatively higher than the luminaire 11 on the center side of the eye direction S (range S1). A signal is output to the control unit 12. And the calculating part 21 outputs the signal which makes the lighting fixture 11 located outside the visual field (it shows by (theta) 4 in FIG. 3) which deviated from angle range (theta) 1-theta 3 to the control part 12. FIG.

Next, psychological comfort improvement, that is, a feeling of relaxation, exerted by the lighting system configured as described above will be described.
The present inventor conducted an evaluation experiment to clarify the difference between the illumination system having the above-described configuration and the other systems (see FIG. 4). In addition, the evaluation experiment is performed under the following conditions for Condition A, Comparative Example 1 and Comparative Example 2 shown in FIG.

  (Condition A) Using a so-called downlight with high directivity of light that irradiates the corner R2 of the present illumination system and the center of the room R, the horizontal illuminance is 47 lx, and the vertical illuminance of the human face Is set to 20 lx.

Comparative Example 1 Using the downlight, the horizontal illuminance is set to 47 lx, and the vertical illuminance of the human face is set to 27 lx.
(Comparative Example 2) A so-called ceiling light that irradiates the entire room R is set, and the horizontal illuminance is set to 51 lx and the vertical illuminance of the human face is set to 41 lx.

  The indoor environment (visual environment) is provided to the subject according to the above conditions, and the relaxation feeling in the environment according to each condition is evaluated by a plurality of subjects in seven stages of 1 to 7, and an average evaluation value thereof is calculated. Then, the evaluation value is 5.3 in the condition A, the evaluation value is 4.3 in the comparative example 1, and the evaluation value is 3.6 in the comparative example 2, and the feeling of relaxation is improved by this lighting system (improvement of psychological comfort). ) Was confirmed.

Next, an operation example (action) of the illumination system of the present embodiment will be described.
In the lighting system having the above configuration, when the calculation unit 21 determines that no person is present in the room R based on the image data of the human detection sensor 22, the control unit 12 turns off each lighting fixture 11.

  When the lighting unit determines that there is a person in the room R based on the image data of the human detection sensor 22, for example, the lighting system turns on all the luminaires 11, and the person from the image data of the face recognition sensor 23. The calculation unit 21 detects the line-of-sight direction S.

  Next, the illumination system includes a range S2 of the angle θ2 that is a range of the peripheral position of the eye direction S, a range S1 of the angle θ1 that is a range on the center side of the eye direction S, and the illuminating device 11 outside the field of view (range of angle θ4). Determine the lighting status. Here, the lighting unit 11 in the range S2 around the eye direction S is controlled by the calculation unit 21 and the control unit 12 so that the light emission output (luminance) is higher than the lighting device in the range S1 on the center side of the line direction S. The Further, when the luminaire 11 located outside the field of view deviating from the angles θ1 to θ3 (shown by θ4 in FIG. 3) is turned on, the illuminator 11 outside the field of view deviating from the angles θ1 to θ3 is calculated. 21 and the controller 12 are turned off (illuminance is 0).

Next, characteristic effects of the present embodiment will be described.
(1) A luminaire 11 provided in the room R that irradiates the room R with light, a face recognition sensor 23 that images at least an irradiation area (room R) of the luminaire, and an irradiation area imaged by the face recognition sensor 23 And a calculation unit 21 that detects the eye direction S of the person in the image information from the image information (image data) in (room R). Further, the control unit 12 that controls the luminaire 11 so that the luminance of the light in the range S2 located around the eye direction S is relatively higher than the luminance of the light in the range S1 located on the center side in the eye direction S. Is provided. By adopting such a configuration, it is possible to improve a feeling of relaxation as shown in FIG. 3 and to improve a person's psychological comfort.

  (2) The control unit 12 sets the illuminance outside the visual field (angle θ4) deviating from the human eye direction S to 0 (extinguishes), and the illuminance of the luminaire 11 within each range S1, S2 and angle θ3 in the eye direction S The lighting fixture 11 is controlled to be lower. By setting it as such a structure, the power consumption of the useless lighting fixture 11 outside a visual field can be suppressed, and it can contribute to an energy saving effect.

  (3) The control unit 12 sets the range S1 of the center side of the eye direction S to a range of 30 degrees horizontally from the center of the eye direction S, and sets the range S2 of positions around the eye direction to 30 degrees horizontally from the center of the eye direction S. The range is -100 degrees. As described above, the peripheral position range S2 is used as a guided visual field (horizontal 30 ° to 100 °) that affects the human spatial coordinate sense, and the psychological comfort is improved without causing the person to feel excessive glare. Can be achieved.

  (4) One lighting fixture 11 is provided for each corner R2 of the room R. Thus, by providing the lighting fixtures 11 at the corners R2 that are relatively far apart in the room R, the lighting fixtures 11 can be appropriately separated. For this reason, it becomes easy to determine in the calculating part 21 by the lighting fixture 11 located in the center position (range S1) of a gaze direction, and the lighting fixture 11 located in the peripheral position (range S2) of a gaze direction, and a center position (range) The illuminance at S1) and the peripheral position (range S2) can be easily controlled individually.

In addition, you may change embodiment of this invention as follows.
-In the above-mentioned embodiment, although the lighting fixture 11 was provided so that it might correspond to every corner | angular part R2 of the room R, it is not restricted to this. For example, as shown to Fig.5 (a)-(c), it is good also as a structure which provides the some light source part 31 and 32 in the one lighting fixture 30, and irradiates the corner | angular part R2 in any one of the light source parts 32. . In this case, it is preferable that the lighting fixture 30 is provided in the approximate center (center) of the ceiling R1 of the room R.

In the above embodiment, the human detection unit 13 is configured by the plurality of sensor units 22 and 23, but the human detection sensor 22 and the face recognition sensor 23 may be configured by one image sensor.
In the above embodiment, the lighting fixture 11 outside the field of view is turned off. However, as long as the illumination intensity is lower than that of the lighting fixture 11 in the field of view (the range within the range S1, the range S2, and the angle θ3). It can contribute to energy saving effect. In addition, you may light the lighting fixture 11 outside a visual field.

  DESCRIPTION OF SYMBOLS 11,30 ... Lighting fixture, 12 ... Control part, 21 ... Computation part which comprises a eyes | visual_axis detection part, 23 ... Face recognition part as an image sensor, H ... Person, R ... Indoors, S ... Eye direction, R2 ... Corner angle Part, S1, S2 ... range.

Claims (5)

A lighting device provided in the room and irradiating the room with light;
An image sensor that images at least an irradiation area of the lighting fixture;
A line-of-sight detection unit that detects a line-of-sight direction of a person in the image information from image information in an irradiation region imaged by the image sensor;
A control unit that controls the luminaire based on the line-of-sight direction detected by the line-of-sight detection unit,
The controller controls the luminaire so that the brightness of light located around the eye direction is relatively higher than the brightness of light located on the center side in the eye direction. system. The lighting system according to claim 1.
The said control part controls the said lighting fixture so that the illumination intensity outside the visual field which remove | deviated from the said person's eyes | visual_axis direction becomes lower than the said eyes | visual_axis direction position. The illumination system according to claim 1 or 2,
The control unit sets the position on the center side in the eye direction as a range of 30 degrees horizontally from the center of the eye direction, and positions around the eye direction as a range of 30 degrees to 100 degrees horizontally from the center of the eye direction. A lighting system characterized by controlling a lighting fixture. In the illumination system according to any one of claims 1 to 3,
The lighting system according to claim 1, wherein at least one of the lighting fixtures is provided for each corner of the room. In the illumination system according to any one of claims 1 to 3,
The luminaire includes a plurality of light sources,
The illumination system, wherein the light source is configured to irradiate a corner portion in the room.

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