纱线真实感的计算机仿真

Numerical 3-D simulation of yarns

通过摄取不同材质的纱线图片,利用RGB颜色空间和HLS颜色空间的相互转换提取纱线的亮度值,并以纱线上像素点的位置坐标为X、Y轴,提取的亮度为Z轴作亮度分布图来分析纱线表面的反射特征。从亮度分布图中获得不同材质的纱线图片亮度分布的差异,用Shepard插值法拟合纱线表面的光反射分布,用拟合得到的函数来仿真纱线,得到的纱线效果较自然,并能反映出不同材质纱线的光泽和构成纱线的纤维聚集形态的差异,真实感强。

Through getting some yarn images of different material texture, withdrawing yarn＇s brightness value using RGB color rooking and HLS color mode interconversion, and made pix point positions on the yarn coordinates X, Y axis and the extracted brightness coordinate Z axis, yarn surface reflection characteristic was analyzed. From the graph, the difference of the brightness distribution of yarns with different material texture is seen. According to the yarn surface reflection characteristic, yarn surface light reflection distribution was fitted by Shepard interpolation and the lightness function was got, then yarn was simulated with the function. The yarn simulated by it looks natural and can reflect the difference of luster and the gather shape of the fiber among the yarns with different material texture.