针对现有轮廓匹配算法在轮廓缺失、轮廓噪声点、非线性光照下匹配效果差的问题,提出了基于方向梯度直方图(histogram of oriented gradient,HOG)特征描述的轮廓匹配算法。将轮廓曲线点离散化,计算所有离散点梯度并统计其在不同方向上的...针对现有轮廓匹配算法在轮廓缺失、轮廓噪声点、非线性光照下匹配效果差的问题,提出了基于方向梯度直方图(histogram of oriented gradient,HOG)特征描述的轮廓匹配算法。将轮廓曲线点离散化,计算所有离散点梯度并统计其在不同方向上的密度分布,以欧氏距离作为相似性度量,采用金字塔分层搜索策略进行搜索。统计所有离散点梯度信息得到梯度方向直方图,融合了轮廓的局部信息和全局信息,使得该算法对部分缺失、遮挡、边缘噪声具有较高的鲁棒性。以印花鞋面表面轮廓为试验对象,使用该算法进行匹配,结果表明,在复杂背景下,该算法对加入人为干扰的鞋面匹配效果较好,且采用金字塔分层搜索策略,匹配速度能满足实际应用的需要。展开更多
针对布匹瑕疵自动化检测,基于传统的机器视觉方法依赖于人工设计特征,对具有复杂背景图案的花色布瑕疵特征提取难度非常大,因此提出一种基于改进Faster R-CNN(faster region with convolutional neural network)的花色布瑕疵检测算法。...针对布匹瑕疵自动化检测,基于传统的机器视觉方法依赖于人工设计特征,对具有复杂背景图案的花色布瑕疵特征提取难度非常大,因此提出一种基于改进Faster R-CNN(faster region with convolutional neural network)的花色布瑕疵检测算法。在Faster R-CNN的基础上使用Resnet-50作为主干网络,嵌入可变形卷积来提高瑕疵特征的学习能力。通过设计多尺度模型来提高小瑕疵的检测,引入级联网络来提高瑕疵检测精度和定位准确度,构造优化的损失函数来降低样本不平衡影响。通过试验验证了该算法的有效性。结果表明,瑕疵检测效果准确率达94.97%,并能精准定位瑕疵位置,可满足工厂的实际需求。展开更多
In view of the lack of research on the information model of tufting carpet machine in China,an information modeling method based on Object Linking and Embedding for Process Control Unified Architecture(OPC UA)framewor...In view of the lack of research on the information model of tufting carpet machine in China,an information modeling method based on Object Linking and Embedding for Process Control Unified Architecture(OPC UA)framework was proposed to solve the problem of“information island”caused by the differentiated data interface between heterogeneous equipment and system in tufting carpet machine workshop.This paper established an information model of tufting carpet machine based on analyzing the system architecture,workshop equipment composition and information flow of the workshop,combined with the OPC UA information modeling specification.Subsequently,the OPC UA protocol is used to instantiate and map the information model,and the OPC UA server is developed.Finally,the practicability of tufting carpet machine information model under the OPC UA framework and the feasibility of realizing the information interconnection of heterogeneous devices in the tufting carpet machine digital workshop are verified.On this basis,the cloud and remote access to the underlying device data are realized.The application of this information model and information integration scheme in actual production explores and practices the application of OPC UA technology in the digital workshop of tufting carpet machine.展开更多
文摘针对现有轮廓匹配算法在轮廓缺失、轮廓噪声点、非线性光照下匹配效果差的问题,提出了基于方向梯度直方图(histogram of oriented gradient,HOG)特征描述的轮廓匹配算法。将轮廓曲线点离散化,计算所有离散点梯度并统计其在不同方向上的密度分布,以欧氏距离作为相似性度量,采用金字塔分层搜索策略进行搜索。统计所有离散点梯度信息得到梯度方向直方图,融合了轮廓的局部信息和全局信息,使得该算法对部分缺失、遮挡、边缘噪声具有较高的鲁棒性。以印花鞋面表面轮廓为试验对象,使用该算法进行匹配,结果表明,在复杂背景下,该算法对加入人为干扰的鞋面匹配效果较好,且采用金字塔分层搜索策略,匹配速度能满足实际应用的需要。
文摘针对布匹瑕疵自动化检测,基于传统的机器视觉方法依赖于人工设计特征,对具有复杂背景图案的花色布瑕疵特征提取难度非常大,因此提出一种基于改进Faster R-CNN(faster region with convolutional neural network)的花色布瑕疵检测算法。在Faster R-CNN的基础上使用Resnet-50作为主干网络,嵌入可变形卷积来提高瑕疵特征的学习能力。通过设计多尺度模型来提高小瑕疵的检测,引入级联网络来提高瑕疵检测精度和定位准确度,构造优化的损失函数来降低样本不平衡影响。通过试验验证了该算法的有效性。结果表明,瑕疵检测效果准确率达94.97%,并能精准定位瑕疵位置,可满足工厂的实际需求。
文摘In view of the lack of research on the information model of tufting carpet machine in China,an information modeling method based on Object Linking and Embedding for Process Control Unified Architecture(OPC UA)framework was proposed to solve the problem of“information island”caused by the differentiated data interface between heterogeneous equipment and system in tufting carpet machine workshop.This paper established an information model of tufting carpet machine based on analyzing the system architecture,workshop equipment composition and information flow of the workshop,combined with the OPC UA information modeling specification.Subsequently,the OPC UA protocol is used to instantiate and map the information model,and the OPC UA server is developed.Finally,the practicability of tufting carpet machine information model under the OPC UA framework and the feasibility of realizing the information interconnection of heterogeneous devices in the tufting carpet machine digital workshop are verified.On this basis,the cloud and remote access to the underlying device data are realized.The application of this information model and information integration scheme in actual production explores and practices the application of OPC UA technology in the digital workshop of tufting carpet machine.
