Objective evaluation of multidirectional fabric wrinkling using image analysis

In the textile industry, the wrinkled fabrics are regularly evaluated subjectively in reference to a set of visual standards. However, due to the disadvantages of visual evaluation, which are unreliable and time-inefficient, several objective methods were recently developed. In this paper, a new objective evaluation of multidirectional realistic fabric's wrinkling generated by the French method of “cylindre creux” was proposed using the image processing. Four characteristics of wrinkled fabrics were evaluated to estimate wrinkle grade with a statistical model. The study reveals a good correlation between the objective wrinkling evaluation (using image analysis) and the subjective evaluation (using the visual standards).     

模拟实际着装的织物抗皱性测试方法

针对现有的织物抗皱性测试方法不能直接用来表征穿着过程引起的折皱这一现象,提出一种可模拟实际着装的织物抗皱性测试方法。构建了模拟装置,并利用图像处理技术提取了折皱密度。经20块织物的相关实验验证得出：模拟方法与实际着装产生的折皱非常相似,说明模拟方法具有一定的可行性,且其测试稳定性好于折皱回复角法;0°折皱回复角与折皱密度的相关性最大,随后是45°,建议增加45°折皱回复角的测试,以使测试结果更能表征实际着装时织物的折皱变形能力;建立了多元回归模型,此模型可用来预测实际着装时的折皱密度,无需经过工作量繁重的服装制作和实际穿着实验。     

基于绉织物表面图像分形特征分析的绉效应评价

通过MATLAB对绉织物表面图像进行处理，根据分形理论对绉织物表面图像的起绉纹理进行分析。结果表明，绉织物表面具有最著的分形特征，且绉织物的起绉程度与绉织物表面的视觉风格存在一定的关系，起绉程度大的绉织物其维数大于起绉程度小的织物。     

Energy modelling of fabrics wrinkle recovery behaviour

Wrinkle recovery behaviour is an important property of fabrics for apparel applications. Fifty fabrics of a variety of constructions have been objectively evaluated in order to study the wrinkle recovery after a deformation. The wrinkle recovery behaviour was studied based on energy modelling. To study their wrinkle recovery properties, fabrics are modelled with the energy method. It is shown that the more the energy dissipation is low, the more fabric is able to recover to its initial state and then the more residual deformation is low. Thus, the energy dissipation can be used to estimate the ability of the fabric to recover to its initial state. In this paper, we also studied the effect of the fatigue test after the repeated wrinkling. Further, the increase of the fatigue cycle number after repeated wrinkling resulted in an increase of the residual deformation and permanent deformation. This method allows us for better approximation of the real behaviour of multidirectional wrinkling of clothing during wearing.     

无彩数码提花织物的创新设计原理和方法

根据数码设计原理,数码提花织物的创新设计研究按设计方法可分为无彩和有彩两种类型。对无彩数码提花织物的创新设计原理和方法进行深入分析,提出无彩灰度的计算机色彩设计原理以及对应的数码全息组织库的建立方法。以单层结构提花织物为基础,在设计方法上将织物结构设计与织物色彩设计有效分离,在CAD系统中根据不同亮度值将数码图像灰度与组织库中的组织进行配对替换,实现织物结构的自动设计,该设计原理和方法满足无彩提花织物人工智能设计的技术要求,同时也是彩色提花织物组织自动生成原理和方法的基础。     

基于不同色纱组合的表里换层织物设计

概述了表里换层组织的基本结构和设计原理,分别设计了2种和3种色纱组合的表里换层织物,得出织物色彩数量与所用色纱数量的关系。结果表明:在改变经纬纱色纱排列次序的情况下,可以在表里换层织物表面形成不同深浅的几何色块,色块的数量随着所用色纱颜色的增加呈几何增长。将表里换层织物的组织变化与色纱变化相结合,可以形成独特的织物风格,为此类织物的设计提供了一种新的思路。     

应用混色纱纹理信息的纬编针织物模拟

为研究数码混色纱纬编针织物的外观色彩及纹影的模拟方法,利用图像处理技术对采集的图像进行平滑去噪,得到剔除细节的模糊图像,在Lab 空间下运用彩色图像硬聚类算法对平滑后的图像进行聚类分割,得到混色纱主体图像,获取其左右的边界和中心线信息;然后在经典的Pierce 线圈模型的基础上,利用混色纱主体图像的廓线信息完成由纱线到线圈圈弧和圈柱的映射;最终根据不同组织的圈弧和圈柱的覆盖关系,得到基本纬编针织物组织。结果表明,提出的纱线映射线圈算法,通过织物组织结构及密度可模拟混色纱纬编织物的混色色彩及外观纹影。     

Objective evaluation of multidirectional fabric creasing

Creasing is one of the most important properties of textiles for apparel application. Most fabrics are regularly evaluated by means of etalons, that is, visual standards. Nevertheless, due to the disadvantages of visual evaluation, which is unreliable and time consuming, several objective methods were developed. In this article, a new objective method of multidirectional evaluation of creasing is described. We have proposed the test method of angle recovery using image processing. The specimen of the fabric was of a circular shape and it was measured by the method of angle recovery in various directions. We compared the results obtained from our method with the method described by Sommer and by the hollow cylinder method also. We found good conformity between the results obtained from our method and the method described by Sommer.     

基于全显色结构的二组纬提花织物的混色特征

 在满足两组纬全显色的条件下,通过色纬的色彩组合方式及比例来研究提花织物空间混色的色彩变化特征。以红色纬与其他基本有彩原色纬组合即红绿（RG）、红蓝（RB）和红黄色彩组合（RY）进行试样,将试样通过扫描仪输入计算机,对试样进行计算机仿真模拟,采用计算机色彩平均计算法计算扫描图和模拟图的L*a*b*色度值,比较两者的明度L*值,计算两者的色差。结果表明：两组纬全显色提花织物空间混色后其明度变化规律性强,试样实物与模拟试样之间有色差,两组纬全显色提花织物依据自己的混色特征可以建立起实用的色彩模型或色卡用于指导该类织物的设计。     

有色棉底布电脑测配色套色

对电脑测配色公式进行推导,建立适合有色棉底布套色的基础数据库。染料总用量相同,采用单一染料分别对空白棉织物单次和两次进行染色,结果显示分次染色后棉织物的K/S值低于单次染色。根据该现象,对现有的套色功能提出质疑。分别建立以空白棉织物和有色棉织物为底布的基础数据库并对数据库的套色准确性进行测试,结果显示直接采用有色棉织物为底布建立基础数据库获得的各染料单位浓度的K/S值应用于有色棉织物套色更符合套色的染色过程,降低了套色次数,减少了套色时间。本文根据实际情况对电脑测配色理论进行了一定程度的拓展,并为采用电脑测配色对有色棉织物修色提供了一条新的途径。     

New objective system of pilling evaluation for various types of fabrics

Image analysis methods are widely used tools for an objective pilling evaluation. However, due to their intrinsic limitations, simple image analysis of digital photographs is not a suitable procedure for the pilling evaluation of fabrics with complex structures and distinct patterns. Generally, a fabric pattern or a complex fabric structure have presented significant problem to the pills detection. This paper describes a system of the objective pilling evaluation of unicolor fabrics and even fabrics with complex patterns. The main points of the pilling evaluation system include a 3D fabric surface reconstruction from shading based on gradient field method, using image analysis tools for the pills detection and an estimation of an objective pilling grade. In order to enable the estimation of the objective pilling grade, a relationship between the pilling grades obtained by a subjective method and selected pill characteristics was specified using a linear regression model. The method was tested on a set of different fabrics and estimated pilling grades were compared with subjective pilling grades of the samples. Results showed that the proposed method is suitable and reliable tool for the objective pilling evaluation of various types of fabrics.     

基于织物透光图像分析评价防钻绒性的方法

为快速、准确、经济地测试织物的防钻绒性能,提出一种采用数字图像处理技术,基于织物透光灰度图像的防钻绒性测试评价方法。利用Photoshop软件放大扫描所得织物的透光数字图像,获取3~5个较大孔隙最亮处的灰度值,通过计算平均透光率,判断织物属于物理防钻绒织物还是化学防钻绒织物;对于物理防绒织物运用MatLab软件按流程图像导入→阈值确定→二值化处理→形态学处理→连通域标记→连通域面积计算对图像进行处理,得到织物的大孔隙频率分布,再与防钻绒织物的极限孔隙分布相比较,以确定织物的防钻绒性能。结果表明:基于织物透光图像的防钻绒性测试评价方法准确可行、简单快捷,而且能节约试验材料。     

Investigation on the novel measurement for fabric wrinkle simulating actual wear

It is very important to measure fabric wrinkling objectively and accurately. However, the most commonly used measurements could not be employed to realistically evaluate and predict how fabric will resist wrinkle when worn on human body. In our previous study, an equipment of measuring fabric wrinkling that can simulate actual wear was proposed. In this paper, we conduct further investigation on the measurement for fabric wrinkle-simulating actual wear, including improving the equipment, validating its repeatability, and clarifying its more accurate relationship with the wrinkle recovery angle (WRA) method. Results show that the measuring repeatability of the method is much better than WRA method and fabric wrinkling in the warp and bias direction plays more important part than weft. Therefore, it is advisable that WRA of the bias should be increased, whose measurement stability is the best in the WRA method as well. Equations of Wrinkle Density (WD) with WRAs are established, which can be used to estimate wrinkling of clothes after actual wear only by several WRAs of fabrics, avoiding the tedious clothes making and trial work.     

图像处理技术在纺织品评定中的应用

文章综述了图像处理系统的信息处理过程,通过将摄取的图像进行滤波、二值化、边缘增强提取图像边界,再经过膨胀腐蚀处理提取特征参数,从而得出表征指标.介绍了在纤维物理指标、纱线分析、织物疵点、织物结构、织物表面形态(悬垂性、折皱、起毛起球)以及织物的综合评价方面的应用研究方法.并对图像处理技术在今后纺织品评定领域的发展做出了展望.     

Objective evaluation of the flatness of popliteal space of pants based on multi-scale convolution北大核心CSCD

III view of the lack of objective evaluation method for actual wearing wrinkle, 35 woven samples were selected and fitted pant samples were drawn and sewn, according to average physique.The wrinkling process of popliteal space of pants in daily activities was simulated, wrinkling images were obtained, subjective evaluation was conducted and image tags were made.SURF was employed to extract image features, images of different grades were combined pairwise for K-means clustering and image labels were corrected.An objective evaluation model on the flatness of popliteal space based on multi- scale convolution was designed, which extracted features from different ranges of wrinkle images that were input using multi- scale convolution, features were fused, and then prediction results of the flatness of wearing were output.The research results indicated that the prediction accuracy of the model was 92.69% , which was better than the classification effect of CNN and BP methods. © 2021 China Silk Association. All rights reserved.     

应用上下文视觉显著性的色织物疵点检测

为实现色织物疵点的有效检测,提出一种应用上下文视觉显著性的疵点检测方法。根据上下文视觉显著性的原则,将织物图像分为大小相同的图像块;然后针对每个图像块,选取K个与其最相似的图像块计算与该图像块的差异值之和,用该差异值之和表示该图像块中心像素的显著性;从而生成一幅视觉显著性图;最后对显著性图进行阈值分割,得到色织物疵点的检测结果。为验证该算法的有效性,将带有纬缩、破洞和跳花等区域性疵点的素色、条纹和格子色织物图像作为样本进行检测。结果表明:该方法可较好地抑制不同种类织物的纹理背景,突出疵点区域,实现疵点的有效检测,该方法在色织物疵点检测上具有一定的可行性。     

针织西服面料的挺括风格研究

为探讨针织面料在西服开发应用的要求与标准,寻找能够用于西服开发的针织面料,分别从弯曲长度、折皱回复性、悬垂性3个方面对针织面料的挺括风格进行量化分析。借助实验仪器以及数据处理得到弯曲刚度、折皱回复角、静态悬垂系数3项性能指标,以机织西服面料为参考标准,对针织面料的挺括风格进行研究分析。结果表明:6路变化罗马组织是较为适合针织面料开发西服的组织结构,其结构稳定性优于12路小提花组织以及变化间隔组织,降低纵向弯曲刚度与横向弯曲刚度的差异;织物厚度增加0.1 mm,折皱回复程度提高10%;织物密度控制在110~130线圈/(5 cm)时,悬垂程度达到机织西服面料的60%以上;6路变化罗马组织配合高织物密度能够使针织面料的挺括风格达到机织西服面料的80%。     

内衣面料触觉舒适性数字化分析与评价模型的建立

针对面料触觉舒适性的主观评价不稳定、标准不统一的问题,该文提出一种基于面料物理性能指标的面料触觉舒适性数字化评价模型。借助织物触感仪测试50款市售内衣面料的力学性能,得到反映织物弯曲、压缩、热传导、表面摩擦和粗糙性能的18项物理性能指标,并衍生出3项感官评价指标以及综合触感评分,以此为基础分析织物物理性能与触觉舒适性的关系,进而建立触感的数字化评价模型,并通过主观实验验证其有效性。研究结果表明,该数字化评价模型回归拟合优度高,主客观实验的评价结果与预测结果一致性高,模型预测效果好。     

基于计盒法的棉绉织物灰度曲面分形特征的研究

文章通过MATLAB对棉绉织物表面图像进行处理,根据分形理论对棉绉织物表面的灰度曲面进行分形特征分析,利用计盒法计算灰度曲面的分形维数,以此评定棉绉织物表面纹理的粗糙度和起绉程度。实验结果表明：棉绉织物表面图像的灰度曲面具有显著的分形特征,分形维数与棉绉织物表面纹理的粗糙度和起绉程度密切相关。     

图像处理技术在服装褶皱评价中的应用

对图像处理技术在纺织服装领域的应用成果进行了回顾,在此基础上探讨了该技术在服装表面褶皱评价领域的应用基础和原理。分析了服装褶皱的形成方法和穿着后所产生的视觉效果,提出了从服装表面提取褶皱图像的方法。经过对图像的处理提取了以灰度为基础的评价指标体系,提出了褶皱数、褶皱深度、褶皱宽度和褶皱不匀度等服装褶皱的评价指标,以期对服装表面褶皱这一视觉效果进行数字化描述。研究结果表明这些评价指标能够很好地反映服装表面褶皱的形态特征。