手绘电路图的在线识别研究

【作者】 徐俊文；

【导师】 廖达雄；

【作者基本信息】 西北工业大学 ， 航空宇航制造工程， 2007， 硕士

【摘要】 电路设计中往往采用CAD技术，以缩短设计周期，节省设计费用，提高设计质量，共享设备资源。但目前，大多数CAD系统对于早期的草图创意阶段仍然不能提供一定意义上的支持和辅助；亟需一种技术或工具，让电路设计师能像在纸上徒手草绘一样，在计算机上自由地进行电路草图设计工作。 智能草图技术就是在计算机支持的环境下，应用CAD和人工智能等技术，实现计算机对早期设计阶段的支持，它是对当前CAD技术的延伸和扩展。在线识别技术是智能草图技术中的关键部分，是模式识别和机器视觉研究领域中的一个分支，历经了较长时间的发展，并随着计算机技术的不断进步以及计算机应用的不断普及，得到了越来越多的重视和研究。 通过研究人员和工程技术人员的不断努力，已经取得了相当丰富的成果，并且某些研究还推出了接近实用的原型系统，但从总体上看，该技术的发展还远未达到实用阶段。在这样的背景下，本文对手绘电路图的在线识别技术进行了系统的研究。 本文主要研究了手绘电路图在线识别中的基本图元、组合图元和电气符号的识别问题。通过分析图元的几何特征，对图元进行了分类和定义。首先对基本图元进行识别，识别成直线、折线段、椭圆、圆、椭圆弧和圆弧；在此基础上对组合图元进行识别规整，包括图元内规整和图元间规整；最后通过空间关系图对电气符号进行匹配，直至完成电路草图的在线识别。本文的手绘电路图在线识别算法得到了实验验证，该算法针对性强、且易于扩充。更多还原

【Abstract】 Intelligence sketch technology is that it uses CAD and artificial intelligence under the computer environment, achieve computer’s sustain in early design period. It’s extending for CAD technology. On-line recognition is a branch of pattern recognition and computer vision, and plays a very important role in Intelligence sketch technology. It studies the methods and techniques to recognize a sketch as it is drawn using a digitizer or an instrumented stylus.With the rapid growth of the computer technology and its widespread acceptance to the society, this research draws much more attention recently, many research teams devote to this complex task which covers a broad field. Aiming at the defects of the existing methods, a study on developing an effective recognition method for the freehand sketches electrical diagrams is performed in this dissertation.In this thesis, we mainly study the method for on-line recognizing the freehand sketching electrical diagrams for the basic primitive shapes, combined primitive shapes and circuit symbols. The primitive shape is classified and defined based on the geometry characteristic. First, we recognize Basic primitive shapes into line, fold-line, ellipse, circle, elliptic arc and circular arc. Then, we adopt the Inner-primitive shape regularization and Inter-primitive shape regularization to recognize the combined primitive shapes. Last, we get the on-line recognizing the freehand sketching electrical diagrams according to the circuit symbol by SRG matching. The freehand sketch recognition system is developed in the above method and confirms our algorithms to be serviceable and extensible.更多还原