大面积鞋帮面接缝的自动提取及矢量化

【作者】 项昱晖；

【导师】 江开勇；

【作者基本信息】 华侨大学 ， 测试计量技术及仪器， 2006， 硕士

【摘要】 本文从实际需要的角度出发，以鞋帮图的自动输入处理为应用背景，利用面向对象的可视化编程语言VisualC++，对鞋帮图识别及矢量化过程中的主要环节鞋帮图的前处理、矢量化跟踪、图形识别及图形格式转换等进行了研究。 首先，针对鞋帮图拍照输入过程中可能出现的噪声以及后续工作的需要，介绍了几种图形预处理算法及其实现，并详细阐述了图形细化的算法及实现。 其次，在图像细化的基础上对图像的矢量化跟踪进行了分析研究，并详细阐述了矢量化跟踪的算法及实现，分析了直线链码的特征，将Freeman链码准则化。通过对离散点进行短线段拟合的基础上，再利用曲线拟合的最小二乘法对圆和直线进行二次拟合。并对矢量化过程中产生的失真现象进行一定程度的补偿，包括短直线的去除、直线的断点连接等。 最后，按照DXF文件格式，将矢量化数据文件转化为DXF文件，实现在AutoCAD环境下对图形进行编辑、修改及输出。 图像识别及矢量化在国内外虽然已经进行了相当长时间的研究，但在鞋帮缝制工艺过程中的应用尚处于起步的阶段。本文也只是该应用领域开展了初步的尝试，还存在许多不足，有待于进一步完善。更多还原

【Abstract】 From the practical application requirements to the automatic upper sewing process with the technological background of image processing , this dissertation focus on the following key technologies related to the upper image identification and vectoring process, including the pretreatments of upper image, BMP discerning and vectoring, drawing file format transforming based on OOP.Firstly, aiming at noise removing of the upper image in the input step and following requirements ,several pretreatment algorithms of image are introduced and realized. Algorithm for image thinning processing and its computing program are fully developed.Secondly, on the result of the image thinning process, methods for the image vectoring is under investigated, its algorithm are proposed in detail. Freeman chain code is adopted in vector tracing. On the basis of short straight-line fitting, this dissertation uses the least-square method of curve matching to discern circle and straight line. At the same time, compensating strategy is introduced for the elimination of distortion phenomena during the process of vectorization by wiping off short straight lines and reducing line segments.Finally , according to DXF’s file format, the vector quantization data files are transformed to DXF’s files. The graphics can be edited, modified and output in the platform of AutoCAD.The research of discerning and vectorization of image has been studied for quite a long-time, but its application in uppers sewing only in the step of underway. This dissertation is an elementary study on its application and also exists lots of shortages, so further research is needed.更多还原