The purpose of the present study is to elucidate the reflection characteristics of woven and knitted fabrics which commonly induce the cognition of specific textures. Fourteen undyed fabrics made of different fiber materials with various weaves and a knit structure were selected for the experimental samples. Images of the surfaces of the samples were recorded through a microscope with incident light and 45 degrees and receiving light of 0, 15, 30, 45, and 60 degrees. The reflected light was separated into specular and diffuse components using polarized filters, based on the dichromatic reflection model. The reflected light separated were visualized to show anisotropy reflections.
For the cotton fabrics, the specular reflection was observed only at the specular angle. For silk fabrics and other filaments, however, the specular component appeared at all receiving light angles, and the intensities obtained from synthetic fabrics and rayon were remarkable.
The intensities of the reflected components showed anisotropy depending on the observation direction of the fabrics. The apparent separation of yarns was narrower for the larger receiving light angles for various structures of weave and knit. This phenomenon may induce the change of the specular components of the light reflected from various surfaces with different normal direction, depending on the yarn and fibers, into the diffuse component of the reflected light. It is thus presumed that the main reason for the intense reflection observed at the receiving light angle, which is larger than the specular angle, must be due to the light reflection from the local surfaces present on the fabric textures, which is unlikely to occur on metal having a smooth surface.
抄録全体を表示