A Text Code Recognition and Positioning System for Engineering Drawings of Nuclear Power Equipment

In this paper, a text code recognition and positioning system for engineering drawings of nuclear power equipment is designed to promote the informatization and automation of paper work created in nuclear power projects including construction procedure and maintenance procedure. Its core function is to analyze engineering drawings, and identify the user-searched code contents in them, and then extract the codes and related information, so that the staff can more quickly retrieve the required codes, obtain the drawing files containing the codes, and locate the codes on the engineering drawings precisely. The code recognition system proposed in this paper is based on the Teigha toolkit, ezdxf open source library, CRNN and PaddleOCR open source library. For engineering drawings in picture format, VGG16 is used for feature extraction of code regions. CRNN based on VGG16 is used to divide the entire coding area, and PaddleOCR is used to identify the coding information. The experiment results show that the system can be effectively used in engineering practice of nuclear power project with high usability, which can greatly improve the work efficiency of staff.