JPH06201352A - Illuminance confirmation of lighting system - Google Patents

Abstract

PURPOSE:To automatize preliminary inspection by way of making possible confirmation of a large number of point light sources in a picture image processing field. CONSTITUTION:By sequentially lighting a large number of point light sources 1 on a semi-spherical surface, forming luminescent spots on a semi-spherical mirror 2 positioned in the center of the semi-spherical surface, picking up images of the luminescent spots of this semi-spherical mirror 2 by a camera 3 and comparing a luminescent spot area and a luminescent spot level with a standard value by picture image processing, normality/abnormality of each of the point light sources 1 is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for confirming the illuminance of a large number of point light sources in a lighting device for an image processing device.

[0002]

2. Description of the Related Art In an image processing apparatus, the illumination state of an observation target greatly affects the image processing ability. In particular, in an image processing system in which the illumination position is changed to capture a plurality of images, the LED light source is excellent in terms of the stable state of illuminance after switching the light source and the stable time. However, in a lighting system where many LED light sources are used,
The quality of the D point light source can be confirmed only by visual inspection, which leads to a decrease in the reliability of the measurement result when the preliminary inspection is insufficient.

[0003]

OBJECTS OF THE INVENTION It is an object of the invention to allow a large number of point light sources to be identified in the field of image processing and to automate pre-inspection.

[0004]

According to the present invention, a large number of point light sources on a hemisphere are sequentially turned on to form a bright spot on a hemispherical mirror located at the center of the hemisphere. An image is taken by a camera, and the bright spot area and the bright spot level are compared with a reference value by image processing to determine whether each point light source is normal or defective.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the arrangement of a hemispherical mirror 2 and a camera 3 with respect to a large number of point light sources 1 as an illuminating device. The large number of point light sources 1 are, for example, LED light sources, and are arranged at equal intervals along a hemispherical 8-division latitude line of the holder 5 with respect to the hemispherical holder 5. Also, the hemispherical mirror 2
It is placed at the center of the sphere of the holder 5. The center position of the hemispherical holder 5 corresponds to the positioning position when the object to be inspected, for example, the soldered portion is inspected using the point light source 1. The camera 3 is provided toward the hemispherical mirror 2 on a vertical line passing through the center of the holder 5,
It is connected to the image processing device 4.

Next, FIG. 2 shows a flowchart of the illuminance confirmation method of the present invention. The program of this method is
It is stored in advance in a program memory inside the image processing apparatus 4. After starting the illuminance confirmation program, first, an identification number of one point light source 1 at a position to be inspected is specified from among many point light sources 1 and it is turned on. The lighting order at this time is set in advance by a program, and for example, one of the point light sources 1 on the lower latitude line is sequentially turned on, for example, in the clockwise direction, and then the point light source on the latitude line on the upper latitude line is similarly turned on. Turn on 1 in order. When one point light source 1 is turned on, one bright spot is formed at a corresponding position on the hemispherical mirror 2.

In the next step, the camera 3 picks up the bright line and sends it to the image processing device 4. The image processing device 4
Performs image processing in real time, calculates the bright spot area and bright spot level corresponding to the bright spots in the captured image, compares it with the preset bright spot area reference value and bright spot level reference value, and compares them Based on the relationship, the point light source 1 in the lighting state at that time is determined to be normal / defective. Then, this determination result is stored together with the identification number of the point light source 1 to be inspected.

In the next step, it is judged whether the illuminance confirmation of all the point light sources 1 is completed, and when all the points are not finished, the next point light source 1 is specified and the same step is performed. Is executed.

When all the inspections are completed, the determination result is displayed on the display of the image processing apparatus 4 along with the identification number of the point light source 1, that is, the normal / defective data, and the illuminance confirmation method ends. The operator reads the displayed contents of the display, performs inspections on the corresponding point light source 1, performs necessary maintenance work such as replacement of the light source, and sets the illumination state to a complete state.

[0010]

According to the present invention, the lighting condition of a point light source such as an LED can be confirmed in a short time before driving, and since this confirmation operation does not rely on visual observation, there are no individual differences in the inspection of many point light sources. In addition to turning off the point light source and lowering the illuminance, it is possible to confirm with high reliability the deviation of the direction of the light flux emitted from the point light source.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the arrangement of hemispherical mirrors and cameras for a large number of point light sources.

FIG. 2 is a flowchart of an illuminance confirmation method for a lighting device.

[Explanation of symbols]

 1 point light source 2 hemispherical mirror 3 camera 4 image processing device 5 hemispherical holder

Claims (1)

[Claims] 1. A plurality of point light sources on a hemisphere are sequentially turned on,
A bright spot is formed by a lit point light source on a hemispherical mirror located at the center of the hemisphere, and the bright spot is imaged by a camera, and by image processing, the bright spot area and the bright spot level are compared with a reference value, A method for checking illuminance of a lighting device, comprising determining whether each point light source is normal or defective.