Brief0397 Real-Time Fabric Defect Detection and Control by gabyion


									Industry Interactions: 38 Levi Strauss, Russell Cor ., Milliken         l  Quantifying defects, causes and frequency in woven fabrics
& Assoc., American Bag d.’Union Special Corp, l?
                          o ,                      oyal Home
Fashions, Sara Lee, Reeves, Fruit of the Loom, Springs Ind.,              and collecting samples from industry for image processing
Diversified Systems)
                                                                        l Investigating techniques for real-time feature detection and
Other Non-NTC Interactions: 15
For Further Information, see page 36                                      texture analysis of images using multi-resolution analysis
                                                                        l Identifying textile and system manufacturers as potential re-

                          Timothy G. Clapp, an Associate Pro-             search partners
                          fessor at NC State, joined the faculty           We have received excellent cooperation from a number of
                          in 1985 after receiving B.S., M.S. and
                          Ph.D. degrees in mechanical engi-
                                                                        textile firms in response to a survey of important defects, pro-
                          neering from NC State.       Tim’s re-        viding samples of defects and two textile firms have offered
                          search interests include apparel              their assistance and their facilities for beta testing in-plant.
                          automation and automated material             We have established alpha testing sites at Georgia Tech and
                                                                                                            NC State.
                          J. Lewis Dorrity: See right                                                          We have shown that the
                                                                     We developed a powerful                 most common defect types
                          L. Howard Olson, an Associate Pro-
                          fessor in Textile and Fiber Engineer-
                                                                     “fractal scanning” tool . . .           on several high-volume fab-
                          ing at Georgia Tech, joined the
                          faculty in 1969. He received a Ph.D.          rics can be detected at
                          in textile physics at Manchester Uni-
                                                                        speeds which will analyze           . . . to transform the
                          versity (England) in 1971 following a
                          M.S. in textile engineering at Georgia        100% of the fabric during         24~ digitized images of
                          Tech in 1967 and a B.S. E. in mechani-        weaving. Work also con-                   woven fabrics
                          cal engineering at Princeton. How-            tinues on algorithm devel-
                          ard’s research interests include
                                                                                                          into 1-D data streams.
                          acoustic sensing of sewing defects,           opment. False alarm rates
                          high performance specialty fabrics,           have been reduced dra-
                          mechanics of knits, quality control           matically to near zero while the detection and identification
                          and     testing,   and physics of             performance has been increased. Recent refinements have
                                                                        centered on improving the lighting conditions by designing a
                          Kimberly J. Titus, a Visiting Assistant       hood to protect the optics and eliminate ambient light effects.
                          Professor in Textile Engineering,
                          Chemistry and Science at NC State,
                                                                       [Other Contributors: Graduate Students: Muid Mufti, Terri
                          received a Ph.D. there in experimen-         Von Hoven, Vipin Ramani, Raziuddin Ali, Martin Chang
                          tal solid state physics in 1994. She         (Georgia Tech); Post-doctoral: Steve Garnier, Harsh Potlam-
                          also earned a B.S. in physics and a          pali (NC State)].
                          B.A. in mathematics from Stetson
                                                                        Indus    Interactions: 42 (Greenwood Mills, Southern Phoenix
                          University in 1989. Kim’s research            Textiles
                          interests include fundamental proper-         Other non-NTC interactions: 4
                          ties of fabric and seams, material
                                                                                                    J. Lewis Dorrity, an Associate Profes-
                          handling, sensor technologies and
                                                                                                    sor of Textile & Fiber Engineering at
                          semiconductor materials for lasers.
                                                                                                    Georgia Tech, joined the faculty in
                                                                                                    1988. He received a MS in electrical
                                                                                                    engineering at the Air Force Institute
                                                                                                    of Technology in 1965, then served 6
                  Real-Time                                                                         years in the U.S. Air Force, leaving as
     Fabric Defect Detection and Control                                                            a Captain. Lew then earned a Ph.D.
                                                                                                    in electrical engineering from Clem-
            in Weaving Processes                                                                    son in 1973 and spent 15 years at
                                                             G94-2                                  Greenwood Mills rising to vice-
                J. Lewis Dorrity, leader,                                                           president of Research and Quality.
          George Vachtsevanos, (Georgia Tech);                                                      His research interests concentrate on
                Warren Jasper (NC State)                                                            instrumentation and control of textile
       Fabric inspection has long been a very labor intensive                                       George Vachtsevanos, a Professor of
process in textile manufacturing. Typically, a weaving mill                                         Electrical Engineering at the School
finds it must inspect 100% of the fabric it produces so that it                                     of Electrical and Computer Engineer-
                                                                                                    ing of Georgia Tech, joined the fac-
can identify the looms which are beginning to make defects.
                                                                                                    ulty in 7984. He received a Ph.D. in
Inspection is a separate process which takes place after the                                        electrical engineering from the City
rolls are removed from the looms. If a portion of the cloth is                                      University of New York in 1970 and
considered too defective, rolls must be reprocessed by remov-                                       taught at Richmond College of CUNY,
                                                                                                    Manhattan College of New York and
ing those defective sections then rerolling to make rolls of                                        the University of Thrace in Greece
First and Second Quality. In some cases, on-loom inspection                                         before     joining   Georgia    Tech.
is carried out by inspectors roaming the weave room and not-                                        George’s research interests include
ing or “flagging” looms creating excessive defects.                                                 intelligent control, fuzzy logic and
                                                                                                    neural networks and their application
In this project we are:                                                                             to complex engineered processes.

    30                                                                               National Textile Center Research Briefs: March 1997

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