Digital Image Processing Technology Research And Application In The Glass Crack Detection System

Since 1950's to this day digital image processing has gotten much and broad application in the communication, video transmission, medicine, printing and dyeing industry, industry inspection and other fields. The technologies and methods of digital image processing have also gotten deep research and development. This paper mainly uses the technologies and methods of digital image processing and computer grogram language to research and develop a glass-crack inspecting system. We can judge whether the image is a crack or not from the digital image processing methods that the inspecting system applies us. The technologies and methods in this system can make a stable base to further research and practical manufacture.This paper first briefly introduces some basic conceptions of digital image processing including its history, characteristic, application field and future developing direction. Then this paper narrates the collecting system of digital image. It includes hardware equipments and foundational theory of the image digitization. This paper expatiates on some digital image processing technologies that the inspecting system may apply to the research and analysis of the collected glass-crack image. Using neighborhood average method and median filter retrains the image noises and make the image edge smooth. Then protract the histogram of the gray image, get the threshold of this image, utilize the threshold method and gray-level slice method to get a binary image, and detect the image edge. Finally calculate the area and perimeter of the glass-crack image, and use the circularity to judge whether this image is a glass-crack image. During the course of using the digital image processing to research and analyze the glass-crack image, apply Microsoft Visual Basic 6.0 grogram language to develop this inspecting system and make the varied arithmetic some individual processing modules. From the open, read and storage of the image to the image segmentation, feature selection until the crack judgment, this system all utilize the modularization program method. It is convenient for programming, operation and processing, makes the operation interface clear and concise, and heighten the7processing speed.This paper also deep researches the module programming of the arithmetic that used in this system. Combining the basic theory of the arithmetic, this paper presents the configuration framework of the arithmetic. It provides the convincing theory foundation to programming, reduces the mistake, makes for the arithmetic extension and makes this system constantly perfect.