What is AOI?
AOI (automatically optical inspection) optical automatic inspection, as the name implies, is a means of automatic inspection through optical system imaging, and is also one of the inspection technologies among many automatic image sensing inspection technologies. Accurate and high-quality optical images are processed and processed. is its core technology.
AOI's R&D background and its advantages
The background of the emergence of AOI inspection technology is that the electronic components are highly integrated and refined, the inspection speed and efficiency are higher, and the development needs of zero defect inspection. The biggest advantage is to save labor, reduce costs, improve production efficiency, and unify inspection standards and Eliminate the interference of human factors, ensure the stability, repeatability and accuracy of the test results, find out the defects of products in time, and ensure the quality of shipments
The basic principle of AOI detection
The principle of AOI detection is to use the camera technology to output the reflected light intensity of the detected object as a quantitative gray-scale value, and compare it with the gray-scale value of the standard image to analyze and determine the defect and classify the process.
To make an image analogy with manual inspection, the ordinary LED or special light source used by AOI is equivalent to natural light during manual inspection, the optical sensor and optical lens used by AOI are equivalent to the human eye, and the image processing and analysis system of AOI is equivalent to the human brain. , that is, the two links of "seeing" and "judging"
AOI equipment composition
The working logic of AOI inspection can be divided into four stages: image acquisition stage (optical scanning and data collection), data processing stage (data classification and conversion), image analysis stage (feature extraction and template comparison) and defect reporting stage (defects). Size type classification, etc.) In order to support and realize the above four functions of AOI detection, the hardware system of AOI equipment includes four parts: working platform, imaging system, image processing system and electrical system. Multidisciplinary automation equipment such as software
In the image acquisition stage, the image acquisition system of AOI mainly includes photoelectric conversion photography system, lighting system and control system. Because the image obtained by photography is used to compare with the template, the accuracy of the acquired image information is very important for the detection result. Imagine if the image collector can't see clearly or can't see the feature points of the detected object, then there is no way to talk about accurate detection.
