JPS61213640A - Simple measuring instrument for brightness - Google Patents

Abstract

PURPOSE:To measure the brightness of an object to be viewed including a self-emitting body which has high brightness precisely with simple constitution by providing a presentation part for the object to be viewed, a brightness control part, an arithmetic part, a display part, etc. CONSTITUTION:The object presentation part 8 consists of the self-emitting light source which presents a reference object for brightness matching to an observer. The brightness control part 9 controls the brightness of the reference object presented at the presentation part 8. Therefore, the observer matches the brightness of the object to be viewed with the brightness of the reference object to determine the brightness of the presentation part 8, and then the control part 9 outputs a signal corresponding to the brightness value. This signal is converted by an A/D converter 10 into a code signal, which is sent to an arithmetic part memory 11. The memory 11 is stored with the value of brightness calculated previously on the basis of the code signal corresponding to the brightness value. For the purpose, the memory 11 is accessed and then the value of brightness is outputted and displayed 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a device for measuring brightness (the "brightness" perceived by humans), which is a standard for evaluating illumination viewing environments and displays.

BACKGROUND ART The brightness of a certain visual object is determined by the brightness of the visual object Lo.
It has been clarified that the luminance difference discrimination coefficient ΔLa1n corresponding to the adaptation state of the eyes of the person viewing it is expressed by the following equation.

B=0.8 ((Lo/ΔLmin)'1)-
=-・(1) The brightness scale in this case is based on the brightness of an achromatic color chart under certain observation conditions, and the brightness is valued by the Munsell value of that color chart. be.

In conventional simple brightness measurement devices, the observer measures the brightness of the object by matching the brightness of the actual object with an achromatic color chart under conditions similar to the above observation conditions. .

FIG. 3 is a block diagram showing an embodiment of a conventional brightness simple measuring device. In FIG. 3, reference numeral 1 denotes a scale presentation unit that presents a reference visual object for brightness matching to the observer. standard? Munsell value is 0 for ljt items.
．． A 5-spacing (7) 7-cell gray scale is used.

Reference numeral 2 denotes a scale reading section which reads the signal (Munsell value) of the reference visual object presented to the scale presentation section. Therefore, when an observer performs brightness matching between a certain visual object and a reference visual object and determines the Munsell value of the scale display section 1, the scale reading section 2
A signal corresponding to the Munsell value is output from. This signal is converted into a code signal S1 by the A/D converter 3 and output. 4 is the illuminance measuring section and the signal from here is A/
The D converter 5 converts it into a code signal S2 and sends it to the arithmetic unit memory 6 together with Sl. The brightness value calculated in advance based on the code signal S1 corresponding to the Munsell value and the code signal S2 corresponding to the illuminance value is stored in the calculation unit memory 6. Therefore, when the calculation unit memory 6 is accessed, the brightness value is stored. The value is output and displayed on the display section 7.

The scale presentation unit 1 in the conventional device has a viewing angle of 2°.
It consists of a visual object and a background surrounding it with a viewing angle of 20 degrees and a Munsell value of 5 (achromatic color). An achromatic color chart is presented as a reference visual object. This scale presentation section 1 has an illuminance of 10004! When illuminated with x, the brightness of the reference object is equal to its Munsell value.

FIG. 4 shows an example of the relationship between the Munsell value, brightness, and illuminance of the reference visual object. Using FIG. 4, the brightness value of the visual object whose brightness is to be determined is determined from the output signals from the scale reading section 2 and the illuminance measuring section 4, that is, the Munsell value and the illuminance.

Problems to be Solved by the Invention These conventional devices have the following problems: (1) Since an achromatic color chart is used as the reference object for brightness matching, there is only a scale of brightness values up to 10. Ta. Therefore, although it is possible to measure the brightness of low-brightness visual objects such as illuminated objects, it is not possible to measure the brightness of high-brightness self-luminous objects such as illumination light sources.

(2) Measurement accuracy is determined by the value pitch of the achromatic color chart used as the reference object. Therefore, in order to accurately measure brightness, a large number of achromatic color charts are required to make the value pinch finer, which is expensive.

There were other problems.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a viewing object presentation unit comprising a self-luminous light source for presenting a reference viewing object for brightness matching to an observer; , a brightness control unit that controls the brightness of the reference visual object presented to the visual object presentation unit, and a signal from the brightness control unit is inputted, and the brightness of the reference visual target whose brightness has been matched by the observer is calculated. It consists of a training section for displaying the brightness value, and a display section for displaying the brightness value.

According to the present invention, with the above-described configuration, the brightness of the visual object can be easily measured by the observer matching the brightness of the visual object and the reference visual object.

Embodiment FIG. 1 is a block diagram showing an embodiment of a simple brightness measuring device of the present invention.

Hereinafter, a simple brightness measuring device according to the present invention will be explained based on FIG. In FIG. 1, reference numeral 8 denotes a visual object presentation unit, which is composed of a self-luminous light source that presents a reference visual object for brightness matching to the observer. Reference numeral 9 denotes a brightness control unit that controls the brightness of the reference visual object presented to the visual object presenting unit 8. Therefore, when the observer determines the brightness of the visual object presentation section 8 by matching the brightness of a certain visual object and a reference visual object, the brightness control section 9 outputs a signal corresponding to the brightness value. This signal is A
/D converter 10 converts it into a code signal and stores it in the calculation unit memory 1.
Sent to 1. The calculation unit memory 11 stores brightness values calculated in advance based on code signals corresponding to brightness values. Therefore, when the calculation unit memory 11 is accessed, the brightness value is output and the display unit 1
2.

A specific example of the configuration of the visual object presentation unit 8 will be described below.

The visual object presentation section 8 includes a visual object portion with a visual angle of 2 degrees and a visual object surrounding it with a visual angle of 20 degrees and a luminance of 61 and 4 cd.
/n? It consists of a background part and a background part. A reference visual object is presented in the visual object section. Further, the visual object presentation section 8 is shielded from light so as not to be affected by external light. FIG. 2 shows data stored in the arithmetic section memory 11. FIG. 2 is a diagram showing the relationship between the luminance and brightness of a reference object.

Effects of the Invention As described above, according to the present invention, the brightness of visual objects including self-luminous objects with west luminance can be measured with high accuracy with a simple configuration, and is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a simple brightness measuring device according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the brightness of a reference object and brightness, and FIG. 3 is a block diagram showing a conventional brightness measuring device. FIG. 4 is a diagram showing the relationship between the Munsell value, brightness, and illuminance of an achromatic color chart. 8.--Visual object presentation unit, 9--111 brightness control unit,
10-.-A/D converter, 11-.-operation section memory, 1
2-111 Display Department Agent's name Patent attorney Toshio Nakao 1 person Figure 2 Base #FJLi&f, 1adj' shallow (cd/rnt 1 No. 4
Zukai exhaust trace E Cl me]

Claims (1)

[Claims] A viewing object presentation section comprising a self-luminous light source for presenting a standard viewing object for brightness matching to an observer; and controlling the brightness of the standard viewing object presented to the viewing object presentation section. Input the brightness control section and the signal from the brightness control section,
A simple brightness measurement device comprising a calculation unit that calculates the brightness of a reference visual object whose brightness has been matched by an observer, and a display unit that displays this brightness value.