4GONG R H, NEWTON A. Image-Analysis Techniques Part Ⅱ : The Measurement of Fiber Orientation in Nonwoven Fabrics[J]. Journal of the Textile Institute, 1996, 87(2): 371 - 388.
5HUANG X C, BRESEE R R. Characterizing Nonwovens Web Structure Using Image Analysis Techniques. Part Ⅱ : Fiber Orientation Analysis [J]. INDA Journal of Nonwovens Research, 1993,5(2) : 14 - 21.
