JPH0617824B2 - Optical quantity distribution measuring method and optical quantity distribution measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention uses an image input means such as a so-called CCD (charge-coupled device) camera capable of observing with high definition to obtain an optical quantity such as brightness. The present invention relates to an optical amount measuring method and an optical amount measuring device for measuring the distribution of.

[Conventional technology]

When measuring the luminance distribution of the surface of the measurement target such as the illuminated area, it is ideal to continuously measure the entire surface of the measurement target, but such measurement is difficult in practice. Therefore, it is conceivable to determine measurement points scattered at predetermined intervals in the illuminated area and perform measurement at each measurement point.

Conventionally, each measurement point is marked while measuring the illuminated area with a measure, the measurement is performed with a luminance meter at each measurement point, and the overall evaluation is performed from the position (coordinates) and measurement value of each measurement point. .

[Problems to be Solved by the Invention]

However, such an optical quantity distribution measuring method requires measurement for determining the position of the measurement point and measurement by a luminance meter at each measurement point in the case of a long illuminated area such as a road. There is a huge amount of work because of this. Therefore, it was possible to measure only at coarse intervals.

From such a background, it is conceivable to perform the measurement using a high-definition image input means such as a CCD camera. In this case, it is necessary to obtain the conversion coefficient in order to establish a correspondence between the image output of the image input means and the actual brightness of the illuminated area.

Therefore, an object of the present invention is to provide an optical quantity distribution measuring method in which a conversion coefficient can be easily obtained and a fine luminance distribution can be easily obtained, and an optical quantity distribution measuring device that can be easily measured. .

[Means for Solving the Problems]

The optical quantity distribution measuring method according to claim (1), the object to be measured is photographed by an image input means capable of performing observation with high definition,
It is an optical quantity distribution measuring method for measuring the brightness of each part of the measurement target by the partial output of each part of the image and the conversion coefficient, and draws a sighting pattern in advance on the measurement target by irradiating a laser beam from a laser scanner. , An average image output of the image input means obtained by setting a sight on the aiming figure and photographing, and the optical about the same measurement range as the aiming figure set on the aiming figure. It is characterized in that the conversion coefficient between an average measurement value of the quantity measuring means is obtained.

The optical quantity distribution measuring device according to claim (2) is a laser scanner that irradiates a laser beam that draws a predetermined aiming figure on a measurement target, and the aiming is set on the aiming figure provided at the same position as this laser scanner and the average With an optical quantity measuring means for calculating the conversion coefficient for measuring the luminance of the, and a high definition for shooting the same measurement range as the image input means provided at the same position as the laser scanner and aiming in the aiming figure. An observable image input means is provided, and a conversion coefficient between an average measurement value of the optical quantity measuring means and an average image output of the image input means is calculated and obtained by the image input means. The brightness of each part of the measurement target is measured based on the partial output of each part and the conversion coefficient.

[Action]

According to the optical quantity distribution measuring method of claim (1), the aiming figures of the optical quantity measuring means and the image input means are commonly set in the aiming figure drawn by the laser beam, and observation regarding the same measuring range is performed. A conversion coefficient between the average luminance obtained by the optical quantity measuring means and the average image output obtained by the image input means is calculated. Then, the brightness of each part is calculated based on the image output and the conversion coefficient of each part of the image input means. In this case, since the laser beam can easily draw a sighting figure at any place, there is no need for troublesome work such as marking on the spot such as the illuminated area,
The conversion factor is easily obtained. Further, since the partial output of each part of the image input means is obtained with pixel accuracy, it is possible to easily measure a fine luminance distribution.

According to the optical quantity distribution measuring device of claim (2), by providing the laser scanner, the optical quantity measuring means and the image input means at the same position, the apparatus can be integrated and the handling becomes easy and the measurement can be performed. Will be easier.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. That is, this optical quantity distribution measuring method uses the optical quantity measuring means 1, the image input means 2, and the laser scanner 3.

The optical quantity measuring means 1 uses a luminance meter as an example. The image input means 2 is capable of observing with high definition, and a so-called CCD (charge coupled device) camera is used as an example. The laser scanner 3 irradiates a laser beam and can easily draw an aiming figure at any place.

In this optical quantity distribution measuring method, the measurement target 4 is irradiated with the laser beam 3a from the laser scanner 3. Furthermore, a laser beam 3a is used to draw an aiming figure with a circle surrounding a predetermined region on the measurement target 4 as an example (FIG. 2 (3)).

The optical quantity measuring means 1 has a center C1 on the optical axis 1a (see FIG. 2).
The aiming figure is set so that (1)) is aligned with the center of the aiming figure. This optical quantity measuring means 1 is usually an optical axis 1, for example.
Including a, it has a measurement field of view defined by the angle of view such as 1/3 °, 1/2 °, 1 °, 2 °, etc., and the sighting pattern drawn by the laser scanner 3 is the measurement corresponding to this measurement field of view. Indicates the range.

The image input means 2 has a center C2 on the optical axis 2a (see FIG. 2).
The aim is set so that (2)) is aligned with the center C4 of the aiming figure ((2) in FIG. 2).

The conversion coefficient is calculated from the average measured value of the optical quantity measuring unit 1 and the average image output of the image input unit 2.

Next, the brightness of each part of the image input means 2 is calculated based on the image output of each part and the conversion coefficient. In this case, the image input means 2 has a high definition and, for example, it is possible to finely obtain the luminance for each pixel or each group of a plurality of pixels.

According to the optical quantity distribution measuring method of this embodiment, the aiming figures of the optical quantity measuring means 1 and the image inputting means 2 are commonly set in the aiming figure drawn by the laser beam 3a, and the observation in the same measuring range is performed. A conversion coefficient between the average luminance obtained by the optical quantity measuring unit 1 and the average image output obtained by the image input unit 2 is calculated. Then, the brightness of each part is calculated based on the image output of each part of the image input means 2 and the conversion coefficient. In this case, since the laser beam 3a can easily draw a sighting figure at an arbitrary place, troublesome work such as marking on the spot such as an illuminated area is not required, and the conversion coefficient can be easily obtained. Further, since the partial output of each part of the image input means 2 is obtained with pixel accuracy, it is possible to easily measure a fine luminance distribution.

Further, according to the optical quantity distribution measuring device, the laser scanner 3,
By providing the optical quantity measuring means 1 and the image input means 2 at the same position, the apparatus can be integrated, the handling becomes simple, and the measurement becomes easy.

Note that the measurement target 4 differs depending on the type of light source that illuminates the measurement target 4, the substance that composes the object illuminated by the light from the light source, and so on. The above-described calculation of the conversion coefficient is performed every time.

〔The invention's effect〕

According to the optical quantity distribution measuring method of claim (1), since the laser beam can easily draw an aiming figure at any place, it is necessary to perform a troublesome work such as marking on the spot such as an illuminated area. , And the conversion coefficient can be easily obtained. Further, since the partial output of each part of the image input means is obtained with pixel accuracy, there is an effect that a fine luminance distribution can be easily measured.

According to the optical quantity distribution measuring device of claim (2), by providing the laser scanner, the optical quantity measuring means and the image input means at the same position, the apparatus can be integrated and the handling becomes easy and the measurement can be performed. Will be easier.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing the basic configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing an example of the centers of the optical axes of the optical quantity measuring means and the image inputting means and a figure drawn by a laser scanner. is there. 1 ... Optical quantity measuring means, 2 ... Image input means, 3 ... Laser scanner, 3a ... Laser beam

Claims (2)

[Claims] 1. An optical quantity for photographing an object to be measured with an image input means capable of observing with high definition and measuring the luminance of each part of the object to be measured by a partial output and a conversion coefficient of each part of the image. A distribution measuring method, irradiating a laser beam from a laser scanner to draw a sighting pattern in advance on the object to be measured, and setting the sighting on this sighting pattern to obtain an average of the image input means obtained by photographing. Image output,
An optical quantity distribution measuring method, wherein the aim is set on the aiming figure, and the conversion coefficient between the image input means and an average measurement value of the optical quantity measuring means in the same measurement range is obtained. 2. A laser scanner for irradiating a laser beam for drawing a predetermined aiming figure on a measurement target, and a conversion coefficient calculation for measuring an average brightness provided at the same position as the laser scanner and aiming at the aiming figure. Optical quantity measuring means for use, and an image input means that is provided at the same position as the laser scanner and has an aiming pattern set on the aiming pattern and that can observe the same measurement range as the image inputting means and that can be observed with high definition. Comprising: calculating a conversion coefficient between an average measurement value of the optical quantity measuring means and an average image output of the image input means, and a partial output of each part obtained by the image input means and the An optical quantity distribution measuring device, characterized in that the brightness of each part of the measurement target is measured based on a conversion coefficient.