Working principle of machine vision equipment in appearance defect detection

Date：2022-03-18 17:36:53Views：1212

It can be used to measure the size and angle of products in real-time, such as the size of products, visual measurement and so on. It can not only increase production capacity, but also reduce people's burden. It can work continuously for a long time. Today, we want to understand the machine vision equipment. Do you want to understand the working principle of vision equipment? Let's have a look.

Machine vision system is to use machine instead of human eye to make various measurements and judgments. It is an important branch of computing. It integrates the technologies of optics, machinery, electronics, computer software and hardware, and involves many fields, such as computer, image processing, pattern recognition, artificial intelligence, signal processing, optical electromechanical integration and so on. The rapid development of image processing and pattern recognition technology has also greatly promoted the development of machine vision.

Machine vision appearance defect detection principle:

All kinds of defects and defects on the product surface must be different from the product itself in optical performance. When the light shines on the product surface, various defects and imperfections will be reflected and refracted by the surrounding environment to produce different appearance. For example, when uniform light is incident vertically on the product surface, if there is no defect on the product surface, the emission direction will not change and the detected light is uniform. When there are defects on the product surface, the light emitted will change, and the detected image will also change.

Due to the existence of defects, stress concentration and deformation will occur around the defects, so it is easy to observe in the image. If a transparent defect (such as crack, bubble, etc.) is encountered, the light will be refracted at the defect, and the intensity of the light will be greater than the surrounding light, so the light detected on the target surface of the camera will be enhanced accordingly. Absorbing impurities, such as sand particles, weakens the light at the defect site, and the detected light is less than the surrounding light on the camera target surface. By analyzing the intensity and characteristics of the image signal collected by the camera, the corresponding defect information can be obtained.

Vision system inspection equipment can replace the traditional manual inspection, realize the online high-speed automatic inspection of product appearance, and realize the automatic identification of product surface defects. It has high efficiency, high precision, low cost and simple operation. Coupled with powerful visualization software, it is easy to adjust, flexible and convenient. It can store measurement data, facilitate the establishment of statistical analysis, and facilitate the rapid finding and solving of problems. Industrial detection technology is the best choice.

Generally speaking, the working principle of machine vision equipment is that the robot vision hardware mainly includes image acquisition and visual processing, and image acquisition is composed of lighting system, visual sensor, analog-to-digital converter and frame memory. Robot vision obtains the two-dimensional image of the environment through the visual sensor, analyzes and interprets it through the visual processor, and then converts it into symbols, so that the robot can recognize the object and determine its position.