从单幅透视线图建立平面立体的模型储 珺1,2,高满屯1,陈国定1
(1.西北工业大学 机电学院,陕西 西安 710072;
2.南昌航空工业学院 土木建筑系,江西 南昌 330034)
摘 要:提出了一种基于直线解释平面立体透视投影线图的新方法。采用一种新的方法表示空间直线坐标,根据画出隐藏线的透视线图中隐含的约束条件,建立线性方程组,求解该线性方程组得到平面立体的三维信息。证明了解释平面立体透视投影线图至少有4个自由度。计算和实验结果证明,该方法能很好地恢复平面立体的三维结构,研究成果可用于CAD和计算机视觉系统。
关键词:计算机视觉,CAD,线图,平面立体
On Making Interpretation of Line Drawing Easier and
More Precise in Computer Vision and CAD
Chu Jun1,2,Gao Mantun1,Chen Guoding1 (1.Northwestern Polytechnical University, Xi′an 710072;
2. Nanchang Institute of Aeronautic Technology ,Nanchang 330034;)
Abstract:Human interpretation of line drawing is different from its computer interpretation.Refs.1,2,and 3 tried to make computer interpretation of line drawing easier.This paper aims to make suchinterpretation easier and more precise than that of Refs.1,2,and 3,particularly easier and more precisethan that of Refs.2 and 3.Both Refs.2 and 3 and this paper deal with the problem of constrainingrelationships between a line and a plane,which is key to the computer interpretation ofline drawing.Butour way of dealing with the interpretation is different from that ofRefs.2 and 3.Section 2 proves that inthe interpretation ofline drawing ofan objectunderperspective projection,there existatleast four degreesof freedom.Subsection 3.1 discusses the constraining relationship between two intersecting straight linesin space.Subsection 3.2 discusses the constraining relationship between a straight line and a planecontaining it.Alinear systemis established for constructing 3Dobjectfromits projection based on above-mentioned relationships.Section 4 gives an example;Fig.3 and Fig.5 showpreliminarily thatour methodis indeed better than that ofRefs.2 and 3 in making interpretation of line drawing easier and more precisein computer vision and CAD(computer aided design).
Key words:computer interpretation,line drawing,perspective projection
计算机解释线图是计算机视觉系统及智能CAD系统研制中的一个重要问题。人理解一幅场景的投影线图非常容易,但使用计算机从线图恢复三维物体信息并不容易。计算机解释线图主要有3个问题:①线图标记;②面的识别;③恢复三维物体结构。
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