図面理解に基づく設備データベース構築方式

抄録

In electric power companies and railway companies etc. with a lot of facilities, maintenance of facilities is a laborious task which should be computerized. In order to realize a computerized facility maintenance system, numerous paper-based facility drawings should be inserted to a database, whose process tends to cost much.
In this paper, we propose a construction method of facility database based on drawing image understanding. This method consists of the following three processes.
(1) Vectorizing process: to input facility drawings through an image scanner, and to analize the image data and to transform them into vector data.
(2) Organizing process: to decide relations among components of the drawings such as texts, lines and symbols, as results of drawing image understanding.
(3) Redaction process: to adjust the vector data and to insert them into a facility database.
In our method, a drawing image understanding is made by fitting figures into ‘relation patterns’ which are adjusted with contents of the drawings. For example, the patterns are relations between facilities and identification numbers, meanings of physical numerals attached to facilities, and so on.
We developed a facility database construction system based on this method. And the results of evaluation proved its effectiveness. The construction cost was reduced to one third compared with that of a former method which relies on human operation.