Machine vision detection system has higher discrimination accuracy and speed than human eyes. It is very important to install machine vision online detection system in the detection of LCD screen. After all, with the widespread popularity of interactive electronic products, the demand for display screen is becoming higher and higher, so the detection technology of display screen has become particularly important.
In terms of detection algorithm and technology, the visual inspection system mainly studies the theoretical algorithm applied to screen defect detection, including camera calibration and image correction, image denoising, filtering, pattern matching, and proposes a simple plane template considering two kinds of distortion to improve image distortion.
The key steps of calibration, point defect detection and line defect detection are realized in turn, and the human-computer interaction interface is designed.
According to different defects, the corresponding detection and processing scheme is proposed, and the hardware of the detection system based on virtual instrument technology and machine vision technology is constructed. On this basis, the defect recognition and automatic detection technology based on image processing technology is deeply studied in theory and experiment.
First of all, due to the large field of view of full screen shooting, the resolution of CCD can not meet the requirements of defect resolution. In this paper, the method of screen block detection is used to effectively solve the problem of insufficient resolution of CCD.
Secondly, image processing and analysis technologies such as image segmentation, edge feature extraction and mathematical morphology are used reasonably, which can take both detection speed and detection accuracy into account.
Finally, through scientific demonstration, reasonable selection and construction of the experimental platform, a large number of experimental tests were carried out, and satisfactory experimental results were obtained, and the automatic detection of LCD defects was realized. The development of machine vision detection system provides a feasible reference scheme for solving this problem.
Machine vision image processing technology of innovative LCD on-line detection system, through the key technology of image processing system to build the system, in the image acquisition, correction, image detection algorithm and implementation of key research, the construction of machine vision based on the detection system of liquid crystal display screen detection system.