Development of a drawing understanding system compiler for cad database constructions

在本研究项目中，为图纸理解系统的实现提供了有效的环境。图纸理解系统编译器，已开发成功。(1)开发了基于识别规则状态转换描述的多用途图形理解系统(图形编译器I)：提出并实现了一个状态转换类型的图形编译器，其中图形中对象的识别级对应于一个状态，自下而上和自上而下的识别规则对应于从状态到另一个状态的转换。对地图、手写图纸和相对简单的工程图纸的实验表明了该系统的有效性。(2)基于目标图形面向对象模型描述的通用图形编译器II的开发：提出了一种引入TMS和目标图形面向对象模型描述的图形编译器II，并用大约5000行PROLOG和7000行C程序实现了该编译器。通过对工程图纸、布置图的实验，验证了该方法的通用性和有效性。(3)成功开发了两个支撑系统：一个是原始的空间数据管理结构，另一个是基于正反例的识别规则学习系统。

In this research project, effective environment for drawing understanding system realization, ie. drawing understanding system compiler, has been successfully developed. The following concrete results have been obtained.(1) Development multi-purpose drawing understanding system (a drawing compiler I) based on state-transition description of recognition rules:A state-transition type drawing compiler, where recognition level of objects in a drawing corresponds to a 'state' and bottom up and top down recognition rules correspond to 'transitions from state to another states' has been proposed and implemented by about a 6,500 lines Program of C and Prolog languages. Experiments for maps, hand-written drawings and relatively simple engineering drawings revealed the effectiveness of this system.(2) Development of a general purposed drawing complier II base on object-oriented model description of target drawings:Another type of drawing complier, where TMS and object-oriented model description of a target drawing are introduced, has been proposed and implemented by a about 5,000 line Prolog and 7,000 lines C program. Experiments for engineering drawings, layout diagrams revealed generality and effectiveness of the method.(3) Two suporting system also have successfully developed; one is original spatial data management structures and the other is a recognition rule learning system based on given positive and negative examples.