A complete set of visual inspection system mainly includes the image acquisition part and image analysis part, and the image acquisition part is mainly industrial camera, industrial lens and machine vision light source bear, today we mainly introduce the basic knowledge of machine vision light source and selection skills.

First of all, we need to understand what role the light source plays in machine vision.

To illuminate the target and increase its brightness;

To form an imaging effect that is conducive to image processing, reduce the complexity of the system and the requirements of image processing algorithm;

Overcome the interference of ambient light, ensure the image stability, improve the accuracy and efficiency of the system;

Through the appropriate lighting design, can make the image of the target information and background information to get the best seperation, this not only greatly decrease the difficulty of image processing algorithm improve the accuracy and reliability of the system at the same time, but unfortunately, there is not a general machine vision lighting system, can deal with different testing requirements, so for each specific case, need to design suitable lighting device, in order to achieve the best effect, and inappropriate lighting, will cause a lot of problems, machine vision light source is so important, but often ignored by many people.

At present, the machine vision light source mainly uses LED (light-emitting diode), which is widely used in the industry because of its high shape freedom, long service life, fast response, good monochrome, diverse colors and high comprehensive cost performance.

Degree of shape freedom

An LED light source is composed of many individual LEDS, which can be made into more shapes than other light sources, making it easier to design the shape and size of the light source according to the user's situation.

Long service life

In order for the image processing unit to obtain accurate and repeatable measurement results, the lighting system must be able to provide stable image input over a long period of time. leds decay after 10,000 to 30,000 hours of continuous operation, but are far better than other types of light sources. In addition, using the control system to make it work intermittently can suppress the light emitting tube heating, life will also be doubled.

Fast response

LED light tube reponse time is very short, the real meaning of response time is to ensure that the work between multiple light sources or different areas of a light source can be switched, using a special controller to power the LED light source, the maximum illumination time is less than 10 seconds.

Various color

In addition to the shape of the light source, another aspect of getting a stable image input is choosing the color of the light source. Even the same shape of the light source, due to the color of the different image will be very different. In fact, how to use the technical characteristics of light source color to get the best contrast image effect have been the main direction of light source development.

Low comprehensive operating cost

With products that are cheap and have no guaranteed performance, the savings on the initial investment will quickly be offset by the cost of routine maintenance and repair. Other light sources not only consume 2-10 times as much power as LED sources, but also have to be replaced almost every month, wasting much of the maintenance engineer's valuable time. And the more light sources put into use, the greater the cost in device replacement and artificial aspects, so the choice of long life LED light sources in the long run is very economic.