基于二维傅立叶变换轮廓法的织物表面形态测量研究

提出一种基于交叉光轴投影光栅系统和非移频的二维傅立叶变换轮廓测量方法,结合数字加权滤波和可靠度排序的解调技术,获取织物表面变形后的三维轮廓数据,并给出了几种织物面形测量的实例。     

基于二维连续小波变换的织物疵点检测

同正常织物纹理比较,疵点区域由于其纹理不规则及变形而导致不同的局部纹理特征。利用二维连续小波特征,能在时域和频域上对织物图像同时实现任意尺度和旋转角度的变换。通过纹理模型和频谱分析,确定出最优的变换尺度和旋转角度,并由预先确定的全局阈值从小波变换系数的模中进行疵点的分割。实际疵点的检测结果表明该方法是可行的。     

傅立叶变换技术在织物和无纺布结构参数测试中的应用

对傅立叶变换在纺织图像滤波、无纺布中纤维取向度检测、以及织物结构参数测量等方面的应用进行了研究和分析,研究的结果表明:傅立叶变换技术是非常有效的.     

应用图像分析技术评估织物起球等级

探讨了应用图像分析技术对织物起球进行客观的等级评估.首先介绍了应用Wold分解纹理模型从织物图像中分离出毛球信息,然后对提取的毛球信息进行阈值化处理,再以毛球的面积百分比、总数和分布等三个特征指标对起球等级进行客观评估.运用上述技术途径对素色、印花及色织的简单与复杂组织等7种织物样品进行起球等级的客观评估,结果与专家的人工主观评定极为吻合.     

基于Wold纹理模型和分形理论的织物疵点检测

应用基于Wold纹理模型,从织物纹理中提取非确定性随机结构.通过正常纹理和疵点纹理中随机结构的表面维分形特征曲线比较,以距离为判别标准定位疵点.几种典型织物疵点的分析表明,基于Wold纹理模型和分形理论的分析方法能准确地检测出织物表面的多种疵点.     

Evaluation of Fabric Pilling Using Light Projection and Image Analysis Techniques

A new instrument based on light projection and image analysis techniques for assessing fabric pilling is presented. This system can automatically detect the pills from the successive sections of the fabric surface, which can make up for the limitation of both the gray level image -analysis techniques and laser triangulab'on techniques. The test of a large number of worsted wool fabric samples shows that it can objectively characterize the degree of pilling by using fuzzy sets and has good accordance with human visual inspection.     

Automatic Measurement for Fabric Surface Shapes with Two-Dimen-sional Fourier Transform Profilometry

Two- dimensional Fourier transform profilometry (2 -D FTP) for data acquisition of fabric surface shapes isproposed. Phase unwrapping technique based on digitalweighted filter and reliability mask are employed. Ex-perimentai results of shape measurement for several fab-ric appearances are given. From the measured results, itis shown that this method can make up for not only thedisadvantage of the gray level image analysis which isonly suitable for simple structure and solid - pattern fab-ric, but also the low speed and high cost of laser dotscanning technique.     

Optimal trajectory planning based on Hamiltonian function of a spherical mobile robot

Designed for planetary exploration, a spherical mobile robot BHQ-1 was briefly introduced. The motion model of BHQ-1 was established and quasi-velocities were introduced to simplify some dynamic quantities. Based on the model, the time- and energy-based optimal trajectory of BHQ-1 was planned with Hamiltonian function. The effects of three key coefficients on the shape and direction of the planned trajectory were discussed by simulations. Experimental result of the robot ability in avoiding an obstacle was presented to validate the trajectory planning method.