Abstract: Bending behavior of fabric is an important specification that reflects the flexibility of fabrics. Nevertheless, most of the research on bending performance of fabrics focus on theoretical analysis rather than testing method. Aiming at this, a simple water-drop method of testing bending behavior of fabric based on image processing was put forward in this paper, which can test different directions or different fabrics bending performance at the same time.And the specific using method were also given,as well as three index, width of water-drop, length of water-drop , area of water-drop and bending index. The four index was compared with the bending length and bending rigidity of 20 fabrics. The following conclusions could be made: the correlations between the four index in the water-drop method and bending length, as well as bending rigidity from largest to smallest are area of water-drop, bending index, width of water-drop and length of water-drop. Besides, the four index all have high linear correlations with bending length and bending rigidity. It was proved that the water-drop method put forward in this paper to test bending behavior of fabric was feasible.

Key words: fabric, bending begavior, bending length, area of water-drop, image processing