JPH0552741U - Light irradiation position display device - Google Patents

Abstract

(57) [Abstract] [Purpose] It becomes easy to correct the variation in the imaging state due to ambient light, and the accuracy of the adjustment work is improved. [Structure] A camera 11 for photographing the irradiation pattern of the light 14 and its surroundings, and a screen 12 for binarizing and displaying the image photographed by the camera 11 according to brightness and darkness. Irradiation pattern 21
On the screen by changing the binarization level until it approaches the light irradiation pattern of the optimum state stored in advance.
A light irradiation position display device characterized by being displayed on.

Description

[Detailed description of the device]

[0001]

This invention relates to a light irradiation position display device. More specifically, the present invention relates to a light irradiation position display device that uses a so-called ITV (industrial camera) that is used to adjust the irradiation position of lights such as automobile headlights.

[0002]

2. Description of the Related Art Conventionally, in a light irradiation position display device using an ITV, for example, when adjusting the irradiation position of a headlight of an automobile, a headlight is irradiated on a screen. Next, the headlight irradiation pattern displayed on the screen is imaged by ITV, and for example, the headlight irradiation portion is represented in white and the non-irradiation portion is represented in black on the CRT screen (see FIG. 6). In this case, the light / dark ratio is 10% (see FIG. 8). In FIG. 8, D represents the optimum state of the incandescent light, and E represents the respective brightness / darkness ratio and the binarization level when the incandescent light has disturbance light.

Next, the center of gravity of the irradiation pattern displayed on the screen is determined to determine whether the optical axis is displaced.

[0004]

However, the conventional light irradiation position display device using the ITV is effective in a dark room state, and therefore is effective in a state where ambient light does not enter, but ambient light does not enter. If it comes, the position of the center of gravity of the headlight irradiation pattern displayed on the screen changes, and there was the problem that the accuracy of adjusting the light irradiation position could not be guaranteed (see Fig. 7). In this case, the light / dark ratio is 25%.

The occurrence of such a problem occurs because the level of binarization of light and dark represented by white or black by the pixel is fixed. That is, as shown in FIG. 8, the image received by ITV is changing between the optimum state with no ambient light and the one with ambient light. However, if the binarization level of light and dark is fixed, the original irradiation This is because the ambient light generated by diffused reflection that is darker than the pattern is also picked up as a bright portion and is captured as white on the screen.

[0006] In general, a factory facility having a conventional automobile assembly line has a structure in which ambient light can easily enter.

[0007]

[Means for Solving the Problems]

A camera for photographing the light irradiation pattern and its surroundings, and a screen for binarizing and displaying the image photographed by the camera according to the brightness and darkness, and the light irradiation pattern shown on the screen are stored in advance. A light irradiation position display device characterized in that the binarization level is changed and displayed on the screen until the light irradiation pattern in the optimum state is approached.

Providing

[0010]

[Operation] When the image captured by the camera has ambient light, the shape of the illumination pattern of the light displayed on the screen is disturbed.

When the binarization level which is displayed as light and dark by the pixel is changed, the binarization level at which an external light portion due to irregular reflection or the like that is darker than the illumination pattern of the conventional light is not displayed is obtained. Be done.

When light and dark are displayed by each pixel at the binarization level, the original irradiation pattern that is close to the irradiation pattern of the light in the optimum state is displayed on the screen.

[0013]

[Embodiment] Fig. 1 showing a schematic view of a use state of an embodiment of the present invention, Fig. 2 showing a conceptual diagram of the same control, Fig. 3 showing a front view of a screen showing an irradiation pattern of a light in an optimum state, and Fig. 3 disturbance light. A description will be given with reference to FIG. 4, which shows a front view of an example screen in the case where there is, and FIG. 5, which shows the same control process diagram.

Reference numeral 11 is a camera. The camera 11 is a so-called ITV. Reference numeral 12 denotes a screen, which is composed of a CRT screen and is composed of a plurality of pixels that can be displayed separately by binarizing light and dark as black or white. Reference numeral 13 is a car, and 14 is a light of the car 13, which is a headlight in this embodiment. Reference numeral 15 is a screen for irradiating a headlight for imaging with ITV.

The camera 11 captures an image of the illumination pattern 21 of the light displayed on the screen 15 and its surroundings 22. The image photographed by the camera 11 is binarized by brightness and darkness at each pixel and displayed separately. Reference numeral 16 is a calculation means, and 17 is a storage device. The storage device 17 stores the irradiation pattern of the light in a peculiar optimum state for each light that has been taught in advance.

First, the headlight 15 of the automobile 13 is turned on and the screen 15 is illuminated. Next, the irradiation pattern of the headlights displayed on the screen 15 is imaged by ITV, and the headlight irradiation part 21 is shown in white and the non-irradiation part is shown in black color 22 on the CRT screen (see FIG. 3). In this case, the light / dark ratio is 10% (see FIG. 2). In FIG. 2, A represents the optimum state of the incandescent light, B represents the optimum state of the halogen light, and C represents the respective binarization levels of the brightness / darkness ratio C in the presence of ambient light.

In a factory that does not take measures against ambient light, such as a conventional factory, ambient light comes in, noise 23 due to ambient light appears on the screen, and the shape of the irradiation pattern is disturbed. Therefore, the center of gravity position 24 of the irradiation pattern image of the headlight changes (see FIG. 4). In this case, the light / dark ratio is 25% (see FIG. 2).

Next, as shown in FIG. 5, the specification of the irradiation pattern of the light being irradiated on the screen 15 stored in the storage device 17 is searched. Next, the arithmetic means 16 compares the image of the light irradiation pattern 21 displayed on the screen with the optimum state in the specifications of the light irradiation pattern.

When the noise 23 or the like due to ambient light occurs in the image displayed on the screen and is unsuitable, the binarization levels displayed as light and dark by the pixels are shown in FIG. When the amount of light received from 11 is changed and the light-dark ratio is set to 10%, noise 23 due to ambient light due to diffuse reflection that is darker than the original light irradiation pattern is not displayed, or suitable for each lamp. Image is obtained

When light and dark are displayed by each pixel at the level of binarization, the original irradiation pattern that is close to the irradiation pattern of the light in the optimum state is displayed on the screen (FIG. 3).

The center of gravity of the light irradiation pattern is obtained based on the light irradiation pattern 21, and the irradiation position of the headlight is adjusted based on the position of the center of gravity.

[0022]

EFFECTS OF THE INVENTION According to the present invention, it is easy to correct the variation of the image pickup state due to the ambient light, and the accuracy of the adjustment work can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view of a usage state of an embodiment of the present invention.

FIG. 2 is a control conceptual diagram of an embodiment of this invention.

FIG. 3 is a front view of a screen showing a light irradiation pattern in the best state of the embodiment of the present invention.

FIG. 4 is a front view of an example of a screen in the presence of ambient light according to the embodiment of the present invention.

FIG. 5 is a control process diagram of the embodiment of the present invention.

FIG. 6 is a front view of a screen showing an irradiation pattern in the best state in the conventional example.

FIG. 7 is a front view of an example screen when there is ambient light in the conventional example.

FIG. 8: Brightness / darkness ratio and binarization level when there is an optimum state and ambient light in the conventional example

[Explanation of symbols]

 11 camera 12 screen 14 light 21 irradiation pattern

Claims (1)

[Scope of utility model registration request] 1. A camera for photographing an illumination pattern of a light and its surroundings, and a screen made up of a plurality of pixels for binarizing an image photographed by the camera by brightness and darkness and displaying the binarized images respectively. A light irradiation position display device characterized in that a binarization level is changed and displayed on a screen until the light irradiation pattern approaches a previously stored optimum light irradiation pattern.