手绘草图笔触识别与规整技术研究*

结合工业设计师个人的构思和工作习惯，提出一套针对产品概念设计在线草图笔触识别与规整方法。利用笔触的绘制速度和型值点密度来估计笔触中的角点数量，并对角点进行识别；然后以最小二乘法为基础，利用型值点反求控制点拟合曲线，将笔触以参数化表示，以及判定和处理多笔触的重叠问题；最后对草图拓扑结构的获取进行了描述。实验结果表明，该方法可以有效地解决草图识别和规整中遇到的问题，适用于对复杂草图的处理，增强在产品创新过程中对草图的理解。

Recognising and processing technology of on line freehand concept sketch

Based on the thinking habits and working situations of industrial designers,this paper prosewted a novel method for preprocessing on-line freehand concept sketches,especially line drawing strokes during the conceptual design stage.Firstly,It estimated the number of corners using the drawing speed and the density of sample points,and then divided strokes in corners.Secondly,fitted the divided strokes with 2D parametric curves based on least-squares.Likewise,in order to solve problem about processing overtracing strokes,least-squares test enable them to tidy a single regular shape.Furthermore,extracted the graph topology of strokes using adaptive threshold.The test result showed that this method was in effect on dealing with complex structure and comprehending the meaning of sketches in the process of product innovation.