关键词: 织物图像, 速度, 非接触测量, 互相关函数, 亚像素拟合

Abstract: The moving speed of fabric is an important technical parameter in textile industry. Troditionally, we measure this speed by touching the fabric. To eliminate the meterage error caused by the slippage between fabric and idler pulley, the paper puts forward untouch meterage technique. The grayscale of fabric’s surface texture is stochastic, the paper gets the fabric’s speed just by acquiring the surface texture’s image and acquire the grayscale information by High Speed Linear CCD Camera.Because the adjacent two images’s waveforms are similar but there are displacement between them,so calculates the displacement by cross correlation arithmetic, combined with the time between two images, the paper gets the fabric’s moving speed. To culculate late the speed more acurately the paper adopts Gauss Curve to fit cross correlation’s peak value and put forward the fitting formula. Thus the paper gets the moving speed to sub-pixel level. The arithmetic’s feasibility and accuracy has been validated through experiment.

Key words: fabric image, speed, non-contact measurment, cross-correlation function, sub-pixel fitting