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Based on image processing printed circuit board defect detection of

Author: DuanLian
Tutor: HuBing
School: Huazhong University of Science and Technology
Course: Physical Electronics
Keywords: Automated Optical Inspection Image Processing Machine Vision Defect Detection Printed circuit board
CLC: TN41
Type: Master's thesis
Year: 2011
Downloads: 67
Quote: 0
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Abstract


Printed circuit board is designed for today's electronic products provide electrical connection key interconnect components , high quality printed circuit boards for electronic products have a stable performance of the basic premise , therefore , for printed circuit board defect detection is necessary in the production process essential an important part of the traditional manual inspection in the production of large quantities of exposed slow, misjudgment rate, high rate of undetected defects , therefore , in terms of speed , accuracy and cost, and so most advantageous automated optical detection technology is gradually to replace manual inspection techniques and become the main form of defect detection . In this thesis, automatic optical inspection technology on the printed circuit board defect detection are discussed. Based on image processing technology and machine vision theory, this paper established based on image processing printed circuit board defect detection system solutions , study various aspects of the system 's algorithm for the structural design of the software and use its Visual C compiler environment the programming. Defect detection system mainly from the lighting device , the image capturing apparatus and an image processing system , image processing system mainly by the image processing and defect detection aspects of composition . Image processing chain by the image preprocessing, image registration, image segmentation and image contrast and other algorithms, precise positioning defects , highlighting the defect image detail ; session in defect detection , through a variety of defects of the image feature analysis, binding assays three different systems design ideas, establish a judgment for specific detection of defects corresponding program . Experiments show that the scheme as described in the text with a variety of types of defects discriminating power while being able to accurately locate the defect , and the size of the defect part deals with a size detection capabilities. To achieve a non-contact and traditional manual testing can not achieve high-precision detection purposes.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Microelectronics, integrated circuit (IC) > Printed circuit
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