In the name of ALLAH the beneficent the merciful Noman Haleem B.E. in Textile Engineering from National Textile University Specialization in Yarn Manufacturing Topic Determination of Twist per Inch value in Double Yarns using Digital Image Processing Techniques
Determination of twist per inch value in doubled yarns using digital image processing techniques By, Noman Haleem TPI value and its significance Affects on yarn properties Yarn strength Yarn comfort Moisture absorbency Affects on fabrics Dye uptake Affects on garments serviceability
Abrasion Pilling Aesthetics affects Conventional Methods of TPI determination Manual Testers Automatic testers Direct counting methods Twist untwist method Take up twist tester Conventional TPI tester Limitations of the conventional methods Destructive nature of testing
Offline testing modes Slow speed of testing Manual calculation Human error Machine performance and calibrations Image processing The analysis of a picture using techniques that can identify shades, colors and relationships that cannot be perceived by the human eye. Image processing is used to solve identification problems, such as in forensic medicine or in creating weather maps from satellite pictures. It deals with images in bitmapped graphics
format that have been scanned in or captured with digital cameras Image processing and textiles Image processing is already being used in various branches of textiles for technical measurements and properties evaluation. Contamination sorters Motion sensing purposes Fiber properties evaluation Fabric properties evaluation Color matching and shade variation detection Research sequence
Hardware setup Image analysis Pattern recognition Algorithm design Algorithm evaluation GUI design Proposed hardware design Image analysis 1 Yarn image of 1 inch length taken by a sensitive camera in presence of a predefined
illumination setup. The background was set to black to evident more details of yarn structure during imaging. Background adjustment Intensity adjustment of image IMADJUST The intensity of digital image of yarn is adjusted in order to evident the minute
details more clearly. Image cropping and pattern recognition Phenomenon of alternating color intensities visualized in gray scale image of yarn present in yarn texture due to irregular reflection of light. Based on these bright and dark clusters in the yarn body there is a certain pattern can be observed that repeats itself after a specified number of pixels. Graph between pixel intensity and number of pixels Graph: Relation between intensity values of pixels and no. of pixels
ROI filtering on basis of pixel intensity ROIFILT Figure: Region of interest filtering on basis of intensity values NFILTER Figure: Implementation of neighborhood processing to precise the results Binary pixels graph Figure: Identifiable dark and bright places in binary image of cropped area BWLABEL
Results for 8 double yarns Mean Calculated Twist = 10.4 Actual Twist = 10.76 Sample No. Calculated TPI 1 10 2
10 3 11 4 11.5 5 10 6
10.5 7 10 8 10.5 9 10.5
10 10 Standard Deviation = 0.516 CV %age = 4.96% Results for 10 doubled yarns Mean Calculated Twist = 8.8 Actual TPI = 8.6 Sample No. 1
Calculated TPI 8.5 2 9.5 3 8 4 9
5 8.5 6 8.5 7 9 8 8.5
9 9.5 10 9 Standard Deviation = 0.483 CV %age = 5.49% Results for 15 double yarns Mean Calculated Twist = 13.5
Standard Deviation = 0.471 CV %age = 3.49% Conclusion As it is clear from the above calculated values of TPI, comparison of reference values and calculated values, standard deviation from mean value and CV %age of TPI calculated, the image processing technique can be used in the determination of twist per inch values of doubled yarns on commercial level. Although there are variations from the average value and also there are limitations in this image processing algorithm but these variations can be fixed with more precise hardware setup and fine tuned IP algorithm. That means a combination of simple setup of hardware and user friendly software can eliminate the conventional testing
techniques and their drawbacks for measurement of TPI values of yarn. This investigation has opened a new horizon for researchers to make this technique usable on the professional grounds to test TPI values of yarn without application of mechanical factors and to enter the era of non destructive and online testing. References Adams, R. (September, 1993). Radial Decomposition of Discs and Spheres Computer Vision, Graphics, and Image Processing: Graphical Models and Image Processing, Vol. 55, No. 5, pp. 325-332. Cybulska, M. (1999). Assessing Yarn Structure with Image Analysis Methods 1, Textile Res J. 69(5), 369-373. Savialle, B. P. (1999). Physical testing of textiles. (pp. 85-94). England: Woodhead Publishing
Ltd. Schwarz, E.R. (1938). Twist Measurements in Single Yarns, Textile Res. J. 8, 157-164. Young, H. D., & Freedman, R.A. (2000). University Physics with Modern Physics (10th ed.). USA: Addison-Wesley Publishing Company. Matlab image processing toolbox online Documentation. Retrieved May 16, 2008, from http://www.mathworks.com/access/helpdesk/help/toolbox/images Thank you very much for your kind attention
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