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Abstract Drawings such as piping and instrument diagrams (P&ID) or ship safety plans have various equipment and components (lines, signs, and text). Every drawing has rules to express these objects with specific symbols. Generally, these drawings are very complex because they are large in size and consist of relationships between several objects. Therefore, the drawing investigators spend countless time and labor.
For the above reasons, this study uses a deep learning model that has been actively researched recently. An object detection model based on deep learning can quickly find various objects within the drawing. However, the drawing differs from the common images in size and characteristics, generally used as an input in deep learning. Therefore, we proposed a series of procedures for applying the deep learning model to the drawing. This study proposed an object detection algorithm specialized for drawings by combining the non-maximum suppression (NMS) algorithm with the sliding window algorithm. YOLOv7 was selected as an object detection model, which showed the best accuracy by comparing various deep learning models. First, we made a detection window that slides on the drawing. Then, the NMS algorithm was applied to remove duplicate objects from the overall detection results.
Training a deep learning model requires a large amount of training data, but it takes a lot of time to label drawings manually. Therefore, we proposed a data generation model for training data. Objects and background images were extracted from several drawings, and training data were generated by randomly mixing them as material and base. The optimal parameters for training data were selected by comparing the accuracy of the drawings. All models used in this study were trained only with the generated virtual training data.
Knowing how many objects are placed in each division of the ship is important in the inspecting process. Therefore, we developed an algorithm that automatically recognizes the division of the ship and organizes the types and numbers of equipment placed in each division. Furthermore, we developed an algorithm that can obtain the connection relationship between objects and detailed specification of objects by recognizing lines and texts connected to each object.
The method proposed in this study was applied to several actual plans. We confirmed the effectiveness of the proposed method by obtaining high average accuracy. By applying the proposed method, the review procedure, which took several days, can be reduced dramatically to a few minutes per drawing.
Publication Date 2023-06-22
Min-Chul Kong, Myung-Il Roh, In-Chang Yeo, Ki-Su Kim, Jeongyoul Lee, Jongoh Kim, Gapheon Lee, "A Detection Method of Objects with Text in Drawings Based on Deep Learning", Proceedings of ISOPE(International Society of Offshore and Polar Engineers) 2023, Ottawa, Canada, 2023.06.19-23

List of Articles
번호 분류 제목 Publication Date
506 International Conference Jisang Ha, Myung-Il Roh, Min-Chul Kong, Mijin Kim, Jeoungyoun Kim, Nam-Kug Ku, "An Automated Method for Pipe Routing in Ship Unit Modules", Proceedings of IMDC 2024, Amsterdam, Netherland, 2024.06.02-06 2024-06-02
505 International Conference Min-Chul Kong, Myung-Il Roh, In-Chang Yeo, In-Su Han, Dongki Min, Dongguen Jeong, "Methods for Graph Conversion and Pattern Recognition for P&IDs", Proceedings of IMDC 2024, Amsterdam, Netherland, 2024.06.02-06 2024-06-02
504 Domestic Conference 전도현, 노명일, 이혜원, "데이터 불확실성 기반 충돌 위험도 평가 및 강화 학습 기반 충돌 회피", 2024년도 스마트전기선박연구회 동계학술발표회, 부산, 2024.02.15-16 2024-02-16
503 Domestic Conference 박동규, 노명일, 하지상, "추진 체계 선정을 포함한 무인수상정 초기 제원 최적화 방법", 2024년도 한국CDE학회 동계학술발표회, 평창, p. 241, 2024.01.29-02.01 file 2024-01-31
502 Domestic Conference 공민철, 노명일, 하지상, 한인수, 김미진, 김정연, "선박 내 배관의 자동 배치를 위한 P&ID의 그래프 변환 방법", 2024년도 한국CDE학회 동계학술발표회, 평창, p. 129, 2024.01.29-02.01 file 2024-01-30
501 Domestic Conference 여인창, 노명일, 공민철, 유동훈, 진은석, "LIDAR를 이용한 선박의 위치 예측 알고리즘", 2024년도 한국CDE학회 동계학술발표회, 평창, p. 99, 2024.01.29-02.01 file 2024-01-30
500 Domestic Conference 한인수, 노명일, 공민철, 이정렬, 박서윤, "의미 유사도 기반의 선박 규정 검색 알고리즘", 2024년도 한국CDE학회 동계학술발표회, 평창, p.126, 2024.01.29-02.01 file 2024-01-30
499 Domestic Conference 김진혁, 노명일 ,여인창, "MLP 기반 상선의 선형 변환 방법", 2024년도 한국CDE학회 동계학술발표회, 평창, p.28, 2024.01.29-02.01 file 2024-01-30
498 Domestic Conference 김하연, 노명일, 하지상, "해상 장애물 추적을 위한 혼합 추적 방법", 2024년도 한국CDE학회 동계학술발표회, 평창, p. 94, 2024.01.29-02.01 file 2024-01-30
497 Domestic Conference 하지상, 노명일, 공민철, 한인수, 김미진, 김정연, "전문가 지식을 고려한 선박 유닛 모듈의 배관 배치 방법", 2024년도 한국CDE학회 동계학술발표회, 평창, pp. 124, 2024.01.29-02.01 file 2024-01-30
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