JP2000155049A - Ugr measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a UGR measuring device capable of calculating the UGR in an indoor space and evaluating uncomfortable glare with a relatively easy means. SOLUTION: This UGR measuring device is provided with an image pickup device 1 fitted with a fisheye lens 1a photographing an indoor space, a UGR arithmetic processing device 2 calculating UGR parameters including light source luminance L, background luminance Lb, light source solid angle ω and position index (p) from the image information outputted from the image pickup device 1, and a display device 3 displaying the output result of the UGR arithmetic processing device. UGR is calculated by the UGR measuring device based on the image information photographed by the image pickup device 1, the complex measuring work for individually measuring the UGR parameters is not required, and uncomfortable glare can be evaluated relatively easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a UGR measuring device for measuring discomfort glare in a lighting environment.

[0002]

[Prior Art] Illuminating Engineering Institute of Japan Illuminating Engineering Institute of Technology JI
According to EC-001: Office Lighting Standard (1992) (literature), for example, in the office lighting standard, a vertical angle φ60 ° to 90 ° of a fluorescent light luminaire is set so as not to give glare to a worker by the luminaire. The glare regulation that makes the brightness of the image below a certain value is determined.

In the glare regulation, two classifications are provided, and these are called glare classifications of lighting equipment. One is to limit the luminance of the lighting equipment from the visual characteristics, and this is defined as the G classification of the lighting equipment. The other is to limit the luminance of the lighting equipment to prevent the reflection glare on the VDT screen, and this is defined as the V classification of the lighting equipment.

On the other hand, the CIE (International Commission on Illumination) uses the UGR evaluation method (CIE) as a method for evaluating discomfort glare.
Pub. 117 [Discomfort glare in interior lig
hting] (1995)).

FIG. 3 is a schematic diagram for explaining a measuring method of the UGR evaluation method.

In the evaluation of discomfort glare by the UGR evaluation method, as shown in FIG. 3, the observation position A is placed at a height of 1.2 m at the center of the wall surface in the room, and the gazing point, that is, the line of sight R is horizontal to the floor surface. , The illumination device L is arranged from the observation position A to the viewing direction distance R, the horizontal distance T, and the height H, and the evaluation is performed under these conditions.

[0007] The UGR is the background luminance Lb [cd / m
² ], the luminance L [cd / m ² ] of the light source, for example, the solid angle ω [sr] and the position index p (position
It can be obtained from the following equation 1 using the UGR parameter consisting of (index).

(Equation 1)

The position index p is obtained from the parameters H / R and T / R based on the Guth position index matrix defined in Table 1.

[Table 1]

[0009]

As described above, it is possible to evaluate the discomfort glare by the UGR evaluation method. However, when measuring the UGR in an actual indoor space, the light source luminance L and the background luminance which are the UGR parameters are measured. The work of measuring each of Lb, the light source solid angle ω, and the position index p is complicated and takes a great deal of time. For example, the light source luminance L is defined as the average luminance of the light emitting surface,
To measure this with a luminance meter, it is necessary to measure several places on the light emitting surface of one lighting fixture and calculate the average of these measured values.

[0010] It is an object of the present invention to provide a UGR measuring apparatus capable of calculating the UGR of an indoor space and evaluating discomfort glare by relatively easy means.

[0011]

A UGR measuring device according to claim 1 includes an image pickup device equipped with a fisheye lens for picking up an image of an indoor space; a light source luminance L, a background luminance Lb, a light source luminance based on image information output from the image pickup device. A UGR processing unit for calculating a UGR parameter including a solid angle ω and a position index p, and calculating the UGR parameter by calculating the parameter;
A display device for displaying an output result of the arithmetic processing device.

In the claims and the following claims, the terms are defined as follows.

The image pickup device is an image pickup means for picking up an image of the indoor space to be subjected to the UGR measurement and outputting the image information as an image, for example, a digital camera. The image captured by the imaging device may be a still image or a moving image.

The fisheye lens mounted on the imaging device is
This is a wide-angle lens that can image most of the indoor space to be measured by the UGR. Therefore, if most of the indoor space can be imaged, a lens that does not fall under the “fisheye lens” generally defined as an optical lens may be used.

The range of the viewing angle for imaging the indoor space is desirably about 180 ° because necessary information can be obtained by one imaging. However, when a wide-angle lens having a narrower viewing angle is used, the light source (apparatus) luminance L is measured by the imaging device, and the background luminance Lb is measured by an illuminometer provided separately from the imaging device. May be input to the UGR processing unit to calculate the UGR.

The UGR arithmetic processing unit calculates UGR parameters and UGR from image information output from an image pickup device, and includes, but is not limited to, a commercially available computer such as a personal computer and a CPU board.

The display device is provided with a display such as a liquid crystal display, a plasma display, a CRT or the like, a printer, or the like capable of displaying the operation result of the UGR operation processing device.

According to the UGR measuring device of the first aspect, since the UGR is calculated based on the image information captured by the image capturing device, a complicated measuring operation such as individually measuring UGR parameters is not required, and discomfort glare is eliminated. Can be evaluated relatively easily.

According to a second aspect of the present invention, in the UGR measuring apparatus according to the first aspect, the imaging device is configured to set the indoor space to a viewing angle of about 180 °.
And a fisheye lens capable of capturing an image with the camera.

According to the UGR measuring device of the second aspect, since the angle of view of the fisheye lens is about 180 °, the indoor space can be reduced by one.
By performing the imaging twice, the UGR of the indoor space can be calculated.

A third aspect of the present invention is a UG according to the first or second aspect.
In the R measurement device, the UGR arithmetic processing device converts image information output from the imaging device into luminance information, and calculates the UGR using the luminance information as a UGR parameter.

According to the UGR measuring device of the third aspect, by converting the image information into the luminance information, it is possible to obtain the luminance of any part of the area where the image pickup device can image.
In addition to the UGR calculation, it is possible to obtain absolute luminance information of the indoor space.

According to a fourth aspect of the present invention, in the UGR measuring device according to any one of the first to third aspects, the UGR arithmetic processing unit sets the light source luminance L, the background luminance Lb, and the light source solid angle ω to ±.
The position index p is calculated with an error of less than ± 20% with an error of less than 25%, and the UGR is calculated with an error range of −2.3 to +1.5.

According to the UGR measuring apparatus of the fourth aspect, it is possible to calculate the UGR having a smaller error as compared with the case where the actual measurement is performed by using the UGR parameter obtained from the image information.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a system configuration of the UGR measuring apparatus according to the present embodiment.

Reference numeral 1 denotes an imaging device having a viewing angle of about 180 °
Of a digital camera equipped with a fisheye lens 1a.

Numeral 2 denotes a UGR arithmetic processing unit, which is a storage means 2a for storing image information output from the image pickup apparatus 1, converts the image information into luminance information, and
An arithmetic processing unit 2b for calculating parameters is provided.
The UGR processing unit 2 is configured using a personal computer or the like.

The arithmetic processing means 2b calculates a background luminance Lb [cd / m ² ] and a light source (apparatus) luminance L [cd /
m ² ], solid angle ω [sr] of light source (instrument) and position index p
Is calculated.

The position index p is obtained from the parameters H / R and T / R based on Guth's position index matrix.

Note that the line-of-sight distance R, the horizontal distance T,
Each parameter of the height H is, as shown in FIG. 3, a horizontal line (AL ′) connecting the floor position L ′ of the light source (instrument) L and the observation position A and a horizontal line (AR) formed by the line-of-sight direction line (AR). The angle θ and the elevation angle φ formed by the line (AL) connecting the light source (instrument) L and the observation position A and the horizontal line (AL ′) are obtained. The horizontal angle θ and the elevation angle φ are calculated from the image information by the UGR processing unit 2.

Reference numeral 3 denotes a display device for displaying, on the CRT display 3a, UGR, luminance distribution, and the like output from the UGR operation processing device 2 as operation results.

Next, an operation method of the UGR measuring device according to the present embodiment will be described.

First, the indoor space of the UGR measurement target is imaged by the imaging device 1. The imaging direction is the same as in the above-described UGR evaluation method (CIE Pub. 117).

FIG. 2 is an example of an image picked up by the image pickup device 1. The indoor space to be imaged in this example is a room with a frontage of 4.8 m, a depth of 7.0 m, and a ceiling height of 2.6 m, and eight lighting fixtures serving as glare sources are mounted on the ceiling. The lighting fixture is a recessed fluorescent lighting fixture for FHF32W2 lamps, and a milky white cover is provided on the lower surface. The UGR of this indoor space is referred to as the UGR of this embodiment.
It was 20.2 when calculated by the measuring device. on the other hand,
When measured by the UGR evaluation method (CIE Pub. 117), the UGR was 20.9, and only an error of -0.7 occurred.

The UGR measuring device of the present embodiment converts image information output from the imaging device 1 into luminance information,
This luminance information can also be displayed on the display device 3. The form of the information displayed on the display device 3 at this time is as follows.
In addition to numerical values representing the average luminance of the indoor space and the luminance of the light source (apparatus) L, an image in which the level of the luminance is converted into a color tone and the like can be cited.

As described above, by measuring the luminance of every part of the area where the image pickup apparatus 1 can image, it is possible to obtain absolute luminance information of the indoor space in addition to the calculation of the UGR.

[0038]

According to the UGR measuring device of the first aspect, since the UGR is calculated based on the image information captured by the imaging device, a complicated measuring operation such as individually measuring UGR parameters is not required. Discomfort glare can be evaluated relatively easily.

According to the UGR measuring device of the second aspect, since the viewing angle of the fisheye lens is about 180 °, the indoor space can be reduced by one.
By performing the imaging twice, the UGR of the indoor space can be calculated.

According to the UGR measuring device of the third aspect, by converting the image information into the luminance information, it is possible to obtain the luminance of every portion of the area where the image pickup device can image.
In addition to the UGR calculation, it is possible to obtain absolute luminance information of the indoor space.

According to the UGR measuring device of the fourth aspect, it is possible to calculate a UGR having a smaller error as compared with the case where the actual measurement is performed by using the UGR parameters obtained from the image information.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of a UGR measurement device according to an embodiment of the present invention.

FIG. 2 is an image captured by an imaging device of the UGR measurement device.

FIG. 3 shows CIE Pub. FIG. 117 is a schematic diagram illustrating a measurement method using the UGR evaluation method of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Image pick-up device, 1a ... Fish-eye lens, 2 ... UGR arithmetic processing device, 3 ... Display device.

Claims (4)

[Claims] 1. An imaging device equipped with a fish-eye lens for imaging an indoor space; a light source luminance L, a background luminance Lb, a light source solid angle ω, and a position index p based on image information output from the imaging device.
A UGR processing unit for calculating a UGR parameter consisting of: and calculating the UGR by calculating the parameter; and a display device for displaying an output result of the UGR processing unit;
A UGR measuring device comprising: 2. The image pickup apparatus according to claim 1, wherein the indoor space has a viewing angle of about 180 °.
2. The UGR measuring apparatus according to claim 1, wherein a fisheye lens capable of imaging with a camera is mounted. 3. The UGR processor converts the image information output from the imaging device into luminance information, and converts the luminance information into U
The UGR measurement device according to claim 1, wherein the UGR is calculated as a GR parameter. 4. The UGR processing device according to claim 1, wherein the light source luminance L, the background luminance Lb, and the light source solid angle ω have an error of less than ± 25%.
The position index p is calculated with an error of less than ± 20%.
The UGR measuring apparatus according to claim 1, wherein the GR is calculated within an error range of −2.3 to +1.5.