In the industrial production of expanded thermoplastic polyurethane (E-TPU) midsoles, the surface defects still rely on manual inspection at present, and the eligibility criteria are uneven. Therefore, this paper prop...In the industrial production of expanded thermoplastic polyurethane (E-TPU) midsoles, the surface defects still rely on manual inspection at present, and the eligibility criteria are uneven. Therefore, this paper proposes an E-TPU midsole surface defect detection method based on machine vision to achieve automatic detection and defect classification. The proposed method is divided into three parts: image preprocessing, block defect detection, and linear defect detection. Image preprocessing uses RGB three channel self-inspection to identify scorch and color pollution. Block defect detection uses superpixel segmentation and background prior mining to determine holes, impurities, and dirt. Linear defect detection uses Gabor filter and Hough transform to detect indentation and convex marks. After image preprocessing, block defect detection and linear defect detection are simultaneously performed by parallel computing. The false positive rate (FPR) of the proposed method in this paper is 8.3%, the false negatives rate (FNR) of the hole is 4.7%, the FNR of indentation is 2.1%, and the running time does not exceed 1.6 s. The test results show that this method can quickly and accurately detect various defects in the E-TPU midsole.展开更多
背景:篮球鞋是篮球运动中最重要的运动装备之一,有助于球员的运动表现提升和降低损伤风险。随着篮球运动的发展,对篮球鞋性能的要求越来越高。目的:系统性回顾和总结不同篮球鞋功能参数对穿着者运动生物力学表现的影响,探究篮球鞋各项...背景:篮球鞋是篮球运动中最重要的运动装备之一,有助于球员的运动表现提升和降低损伤风险。随着篮球运动的发展,对篮球鞋性能的要求越来越高。目的:系统性回顾和总结不同篮球鞋功能参数对穿着者运动生物力学表现的影响,探究篮球鞋各项功能参数对运动表现和损伤风险的影响。方法:通过计算机检索中国知网、万方、Web of Science、ScienceDirect等数据库中篮球鞋功能参数对穿着者运动生物力学影响的试验研究,中文检索词包括“篮球,篮球鞋,鞋,运动生物力学,运动学,动力学”,英文检索词包括“basketball,shoe,shoes,footwear,biomechanics,kinematics,kinetics”,对检索到的文献进行评估和筛选,最终纳入61篇文献进行综述。结果与结论:篮球鞋功能参数的现有研究包括鞋帮高度和跟杯硬度、中底硬度、中底缓震性、中底厚度、前足弯折刚度、整鞋质量、外底抓地力等。篮球鞋功能参数调整在提升运动表现和降低运动损伤风险方面发挥一定作用:①相较于低帮鞋,高帮鞋能够降低踝关节扭伤的风险,但可能会影响运动表现、踝关节的本体感受和增加膝关节负荷;②更好的中底缓震性或更软的中底能够有效降低垂直方向的冲击,前掌缓震结构能够有效提升横向运动的运动表现;③前掌11 mm、后掌20 mm的中底厚度能够获得最佳的脚踝稳定性和冲刺表现;④提升篮球鞋外底的抓地力、前足弯折刚度能够显著改善跳跃、冲刺和侧切的运动表现,其中提升外底抓地力对运动表现的改善存在收益递减现象;⑤质量更轻的篮球鞋能够提升运动表现,但这种影响只发生在穿着者对鞋子质量知情的情况下。展开更多
文摘In the industrial production of expanded thermoplastic polyurethane (E-TPU) midsoles, the surface defects still rely on manual inspection at present, and the eligibility criteria are uneven. Therefore, this paper proposes an E-TPU midsole surface defect detection method based on machine vision to achieve automatic detection and defect classification. The proposed method is divided into three parts: image preprocessing, block defect detection, and linear defect detection. Image preprocessing uses RGB three channel self-inspection to identify scorch and color pollution. Block defect detection uses superpixel segmentation and background prior mining to determine holes, impurities, and dirt. Linear defect detection uses Gabor filter and Hough transform to detect indentation and convex marks. After image preprocessing, block defect detection and linear defect detection are simultaneously performed by parallel computing. The false positive rate (FPR) of the proposed method in this paper is 8.3%, the false negatives rate (FNR) of the hole is 4.7%, the FNR of indentation is 2.1%, and the running time does not exceed 1.6 s. The test results show that this method can quickly and accurately detect various defects in the E-TPU midsole.
文摘背景:篮球鞋是篮球运动中最重要的运动装备之一,有助于球员的运动表现提升和降低损伤风险。随着篮球运动的发展,对篮球鞋性能的要求越来越高。目的:系统性回顾和总结不同篮球鞋功能参数对穿着者运动生物力学表现的影响,探究篮球鞋各项功能参数对运动表现和损伤风险的影响。方法:通过计算机检索中国知网、万方、Web of Science、ScienceDirect等数据库中篮球鞋功能参数对穿着者运动生物力学影响的试验研究,中文检索词包括“篮球,篮球鞋,鞋,运动生物力学,运动学,动力学”,英文检索词包括“basketball,shoe,shoes,footwear,biomechanics,kinematics,kinetics”,对检索到的文献进行评估和筛选,最终纳入61篇文献进行综述。结果与结论:篮球鞋功能参数的现有研究包括鞋帮高度和跟杯硬度、中底硬度、中底缓震性、中底厚度、前足弯折刚度、整鞋质量、外底抓地力等。篮球鞋功能参数调整在提升运动表现和降低运动损伤风险方面发挥一定作用:①相较于低帮鞋,高帮鞋能够降低踝关节扭伤的风险,但可能会影响运动表现、踝关节的本体感受和增加膝关节负荷;②更好的中底缓震性或更软的中底能够有效降低垂直方向的冲击,前掌缓震结构能够有效提升横向运动的运动表现;③前掌11 mm、后掌20 mm的中底厚度能够获得最佳的脚踝稳定性和冲刺表现;④提升篮球鞋外底的抓地力、前足弯折刚度能够显著改善跳跃、冲刺和侧切的运动表现,其中提升外底抓地力对运动表现的改善存在收益递减现象;⑤质量更轻的篮球鞋能够提升运动表现,但这种影响只发生在穿着者对鞋子质量知情的情况下。
