Flaw detection of cylindrical surfaces in PU-packing by using machine vision technique

被引:36
作者
Chiou, Yih-Chih [1 ]
Li, Wei-Chen [1 ]
机构
[1] Chung Hua Univ, Dept Mech Engn, Hsinchu 30012, Taiwan
关键词
Automatic optical inspection; Line scan; Flaw detection; Seating elements;
D O I
10.1016/j.measurement.2009.02.006
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
PU-Packing is widely used in machinery to prevent fluid from leaking. Due to the high demand for productivity and quality, bare-eye-inspection approach becomes extremely inadequate. In view of that, we developed a machine-vision-based system for detecting flaws occurred in PU-packings. The system consists of three inspection stations. The first station uses area-scan cameras to check the top and bottom surfaces of a packing. The second station uses an area-scan camera to check the interior of a packing incorporated with an infrared LED backlight. The third station uses two line-scan cameras to simultaneously scan inner and outer cylindrical surfaces of a packing. After images have been scanned, we applied variance of radius inspection method, projection method, coordinate transformation techniques, and normalized grayscale absolute difference inspection method to locate seven frequently detected defects, including deformations, burrs, interstices, scratches, blisters, air bubbles, and inclusions. The performance of the proposed system was evaluated by the accuracy, false positive rate, false negative rate and inspection time. The overall accuracy is 90.1% indicating that the proposed inspection apparatuses and methodologies are appropriate. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:989 / 1000
页数:12
相关论文
共 17 条
[1]  
BIANG BC, 1998, J MANUF SYST, V17, P159
[2]   Efficient computation of adaptive threshold surfaces for image binarization [J].
Blayvas, I ;
Bruckstein, A ;
Kimmel, R .
PATTERN RECOGNITION, 2006, 39 (01) :89-101
[3]  
Freeman H., 1974, Computing Surveys, V6, P57, DOI 10.1145/356625.356627
[4]  
Gribbon KT, 2004, INT SYM ELECT DES TE, P126
[5]   SUBPIXEL EDGE LOCALIZATION AND THE INTERPOLATION OF STILL IMAGES [J].
JENSEN, K ;
ANASTASSIOU, D .
IEEE TRANSACTIONS ON IMAGE PROCESSING, 1995, 4 (03) :285-295
[6]   Use of a medical ultrasonic scanner for the inspection of high voltage insulation [J].
McGrail, A. ;
Risino, A. ;
Auckland, D.W. ;
Varlow, B.R. .
IEEE Electrical Insulation Magazine, 1993, 9 (06) :5-10
[7]   THRESHOLD SELECTION METHOD FROM GRAY-LEVEL HISTOGRAMS [J].
OTSU, N .
IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS, 1979, 9 (01) :62-66
[8]   NEURAL NETWORKS FOR CLASSIFYING SURFACE-DEFECTS ON AUTOMOTIVE VALVE STEM SEALS [J].
PHAM, DT ;
BAYROCORROCHANO, EJ .
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE, 1995, 35 (08) :1115-1124
[9]   INTELLIGENT VISUAL INSPECTION OF VALVE-STEM SEALS [J].
PHAM, DT ;
JENNINGS, NR ;
ROSS, I .
CONTROL ENGINEERING PRACTICE, 1995, 3 (09) :1237-1245
[10]  
PHAM DT, 1995, P I MECH ENG D-J AUT, V208, P83