JPH05332939A - Visual recognition device - Google Patents

Abstract

PURPOSE:To constantly achieve consistent performance regardless of combination of an object to be recognized and a background color. CONSTITUTION:The title device is provided with an illuminating light source part with a plurality of LEDs 5 with different luminescent colors, a dimmer means 9 for each luminescent color which controls the quantity of light at the lighting light source part independently for each luminescent color, a camera 3 which measures the lighting state for an object 1 to be recognized to output a control signal to the dimmer means 9 for each luminescent color, an image contrast measuring means 7, and a dimmer signal generation means 8. The quantity of light is controlled for each luminescent color to vary illuminating state, thus achieving illumination with spectral characteristics for maximizing the contrast between the object 1 to be recognized and a background 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual recognition device mounted on industrial automatic equipment and the like, and more particularly to a lighting device for the visual recognition device.

[0002]

2. Description of the Related Art In recent years, in circuit mounting equipment, there is a tendency to use a technique for mounting a visual recognition device to form a circuit board of higher density and measuring a deviation of a board or a component for feedback.

A conventional example will be described below with reference to FIG. As shown in FIG. 2, the recognition target 11 is photographed by the camera 13 under the background 12, the photographed input image is subjected to predetermined processing by the image processing device 14, and the recognition result is output.

In order to secure the exposure of the camera 13 and to emphasize the contrast between the recognition object 11 and the background 12 at the time of photographing an image, illumination in which light emitters 15 of a single type are collected is used. A high-luminance light emitter such as a tungsten light bulb, a halogen light bulb, or a white fluorescent lamp is generally used as the light emitters 15, and all the light emitters 15 are provided by the single light control means 16.
The light intensity of the light is adjusted simultaneously.

[0005]

However, in the illuminating device composed of the light emitters 15 of the above-mentioned single type, the spectral characteristic has a distribution unique to the light emitters 15 and cannot be arbitrarily controlled. Therefore, under the spectral characteristics of the light-emitting body 15 being used, the recognition target object 11 and the background 12 are
There are color combinations that reduce the contrast of
This has been a factor that reduces the performance of the visual recognition device as a whole. That is, when the inexpensive monochrome camera 13 is used, even if the object color of the recognition target 11 and the color of the background 12 are different, the total amount of light reflected by each surface in all wavelength ranges is close to each other. Then, the contrast between the both is lowered, which causes the deterioration of the input image.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a visual recognition device which can always exhibit a constant performance regardless of the combination of the object color and the background color of the recognition object.

[0007]

A visual recognition device according to the present invention is an illumination light source unit having a plurality of light emitting bodies of different emission colors, and an illumination light amount controller for independently controlling the light amount of the illumination light source unit for each emission color. And a photometry unit for measuring the illumination state of the recognition object and outputting a control signal to the illumination light quantity controller unit.

Preferably, the illumination light source section is composed of LEDs of three colors corresponding to the three primary colors of light. In addition, the photometry unit controls the brightness difference between the recognition target and the background based on the image captured by the image capturing apparatus such as a TV camera and the image capturing apparatus, and controls the light amount for each emission color so that the brightness difference increases. It is composed of means for outputting a signal.

[0009]

With the above-described structure, the present invention can control the amount of light for each emission color to change the illumination state in real time, and can perform illumination having a spectral characteristic that maximizes the contrast between the recognition target and the background. A visual recognition device that is not affected by the combination of the object color and the background color of the recognition target can be configured.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A visual recognition apparatus according to an embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, the recognition object 1 and the background 2 are photographed by the camera 3 as in the conventional example. The recognition target object 1 and the background 2 are illuminated by an illumination light source unit composed of a plurality of LEDs 5 having three different emission colors corresponding to the three primary colors of light. The image signal input from the camera 3 is input to the image processing device 6. The image processing device 6 includes an image processing unit 4, an image contrast measuring unit 7, a dimming signal generating unit 8, and a dimming-color-based dimming unit 9.

When an image signal is input to the image processing device 6, the contrast between the recognition object 1 and the background 2 is measured by the image contrast measuring means 7, and the measurement result is input to the dimming signal generating means 8. . The dimming signal generation means 8 determines the spectral characteristics for enhancing the contrast of the image based on the contrast information. This dimming signal generation means 8
The light emission color-specific light control unit 9 controls the light amount of the LED 5 for each light emission color on the basis of the spectral characteristic determined in (4).

When an image signal having a desired contrast is obtained in this way, the input image signal is subjected to predetermined processing by the image processing means 4, and the recognition result is output.

As described above, according to the visual recognition device of the present embodiment, the illumination light source section composed of the LEDs 5 having different emission colors and the light emission color-specific light control means 9 for controlling the light amount of the LEDs 5 for each emission color. By including, it is possible to obtain an illumination condition suitable for visual recognition processing in real time.

[0015]

According to the present invention, as described above, the illumination light source section composed of the light emitting bodies having different emission colors, the illumination light quantity controller section for controlling the light quantity for each emission color, and the illumination state are measured. By providing a photometric unit that outputs a control signal to the illumination light amount controller unit, it is possible to perform illumination with spectral characteristics suitable for visual recognition processing according to the recognition target and the background, and to provide a stable visual performance. A recognition device can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a visual recognition device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional visual recognition device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recognition object 2 Background 3 Camera 5 LED (light-emitting body) 7 Image contrast measuring means 8 Light control signal generating means 9 Light control means for each emission color

Claims (3)

[Claims] 1. An illumination light source unit having a plurality of light emitting bodies of different emission colors, an illumination light amount controller unit which independently controls the light amount of the illumination light source unit for each emission color, and an illumination state for a recognition target object is measured. A visual recognition device comprising a photometric unit that outputs a control signal to the illumination light amount controller unit. 2. The visual recognition device according to claim 1, wherein the illuminating light source section is composed of LEDs of three colors corresponding to the three primary colors of light. 3. The photometric unit includes a photographing device such as a TV camera,
It is characterized by including means for measuring the brightness difference between the recognition object and the background from the image captured by the imaging device, and outputting a control signal for controlling the light amount for each emission color so that the brightness difference increases. The visual recognition device according to claim 1.