JP3249216B2 - How to check the illuminance of lighting equipment - Google Patents

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 an illumination device for an image processing device.

[0002]

2. Description of the Related Art In an image processing apparatus, the state of illumination of an observation target greatly affects the ability of image processing. In particular, in an image processing system that captures a plurality of images by changing the illumination position, the LED light source is excellent in terms of the stable state of the illuminance after the light source is switched and the stable time. However, in a lighting system using a large number of LED light sources, individual LEs are required.
The quality of the D point light source can be checked only by visual inspection, and when the preliminary inspection is insufficient, the reliability of the measurement result may be reduced.

[0003]

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

[0004]

According to the present invention, a plurality of point light sources on a hemisphere are sequentially turned on, a bright spot is formed on a hemispheric mirror located at the center of the hemisphere, and the bright spot is formed. An image is captured by a camera, and the image area is compared with the luminescent spot area and the luminescent spot level with reference values to determine whether each point light source is normal or defective.

[0005]

FIG. 1 shows the arrangement of a hemispherical mirror 2 and a camera 3 with respect to a number of point light sources 1 as an illumination device. The multiple point light sources 1 are, for example, LED light sources, and are arranged at equal intervals along a hemispherical-shaped eight-part parallel 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. Note that the center position of the hemispherical holder 5 corresponds to a positioning position when an inspection target, for example, a soldered portion is inspected using the point light source 1. The camera 3 is provided on the vertical line passing through the center of the holder 5 toward the hemispherical mirror 2,
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 for this method is
It is stored in advance in a program memory inside the image processing device 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 is turned on. The lighting order at this time is set in advance by a program. For example, one of the point light sources 1 on the lower latitude line is sequentially turned on, for example, clockwise, and then the point light source on the upper latitude line is similarly set. 1 is turned on 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.

[0007] In the next step, the camera 3 captures the bright line and sends it to the image processing device 4. The image processing device 4
Image processing is performed in real time, a bright spot area and a bright spot level corresponding to a bright spot of a captured image are calculated, and the bright spot area reference value and a bright spot level reference value are compared with the preset bright spot area reference value. Based on the relationship, normal / defective is determined for the point light source 1 in the lighting state at that time. Then, the determination result is stored together with the identification number of the point light source 1 to be inspected.

In the next step, it is determined whether or not the illuminance confirmation of all the point light sources 1 has been completed. When all of the points have not been completed, the next point light source 1 is specified and the same steps are performed. Is executed.

When all the inspections have been completed, the result of the determination is displayed on the display of the image processing device 4 together with the identification number of the point light source 1, that is, the data of normal / defective, and the illuminance confirmation method ends. The operator reads the display contents of the display, performs necessary maintenance work such as inspection of the corresponding point light source 1 and 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 checked in a short time before driving, and since this checking operation does not rely on visual observation, many point light sources can be inspected without individual differences. In addition to the fact that the point light source is not turned on and the illuminance is lowered, the deviation of the direction of the irradiation light beam of the point light source can be confirmed with high reliability.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing the arrangement of a hemispherical mirror and a camera with respect to a number of point light sources.

FIG. 2 is a flowchart of an illuminance confirmation method of the illumination device.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01B 11/00-11/30 102 G01J 1/00-1/60 G01N 21/84-21/958

Claims (1)

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