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Optimizing Text Recognition in Mechanical Drawings: A Comprehensive Approach
Linköping University, Department of Management and Engineering, Product Realisation. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-5950-4962
Linköping University, Department of Management and Engineering, Product Realisation. Linköping University, Faculty of Science & Engineering.
2025 (English)In: Machines, E-ISSN 2075-1702, Vol. 13, no 3, article id 254Article in journal (Refereed) Published
Abstract [en]

The digitalization of engineering drawings is a pivotal step toward automating and improving the efficiency of product design and manufacturing systems (PDMSs). This study presents eDOCr2, a framework that combines traditional OCR and image processing to extract structured information from mechanical drawings. It segments drawings into key elements-such as information blocks, dimensions, and feature control frames-achieving a text recall of 93.75% and a character error rate (CER) below 1% in a benchmark with drawings from different sources. To improve semantic understanding and reasoning, eDOCr2 integrates Vision Language models (Qwen2-VL-7B and GPT-4o) after segmentation to verify, filter, or retrieve information. This integration enables PDMS applications such as automated design validation, quality control, or manufacturing assessment. The code is available on Github.

Place, publisher, year, edition, pages
MDPI , 2025. Vol. 13, no 3, article id 254
Keywords [en]
mechanical drawings; optical character recognition; intelligent document processing; quality control; vision language models
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:liu:diva-212838DOI: 10.3390/machines13030254ISI: 001452775200001Scopus ID: 2-s2.0-105001120622OAI: oai:DiVA.org:liu-212838DiVA, id: diva2:1950437
Note

Funding Agencies|Vinnova; DART project; [2021-02481]; [2024-01420]

Available from: 2025-04-07 Created: 2025-04-07 Last updated: 2026-02-06
In thesis
1. Learning-Based Methods for Visual Understanding in Engineering and Production Workflows
Open this publication in new window or tab >>Learning-Based Methods for Visual Understanding in Engineering and Production Workflows
2026 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Artificial intelligence (AI) has advanced rapidly across engineering and industrial domains, yet its adoption in production environments is often constrained by the need for higher system reliability, limited availability of high-quality data, and the challenge of embedding tacit engineering knowledge into learning-based models. These limitations hinder the broader industrial push toward flexible, data-driven automation capable of handling increasing product variability and shorter production cycles.

This thesis investigates how learning-based methods can be designed and integrated as re-liable perception components within production workflows. Through four complementary case studies, the work demonstrates how visual representations—ranging from Computer-Aided Design (CAD)-derived images and engineering drawings to point clouds and RGB-D images—can be leveraged to address concrete industrial challenges across multiple stages of the manufacturing pipeline.

The first case study predicts fixturing clamp configurations for welding operations in automotive manufacturing by learning geometric patterns from CAD-derived representations. The second applies optical character recognition to engineering drawings to accelerate quality-control and documentation workflows. The third examines scene reconstruction and 3D object detection from point clouds, using synthetic data generation to mitigate data scarcity. The fourth develops a fast, zero-shot pose estimation approach for robotic manipulation, enabling reliable object localization in dynamic industrial environments.

Taken together, these studies show how AI methods informed by structured engineering knowledge can increase process efficiency, reduce manual workload, and help resolve persistent automation bottlenecks in modern manufacturing.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2026. p. 62
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2506
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:liu:diva-221069 (URN)10.3384/9789181184648 (DOI)9789181184631 (ISBN)9789181184648 (ISBN)
Public defence
2026-03-05, ACAS, A-building, Campus Valla, Linköping, 13:15 (English)
Opponent
Supervisors
Funder
Vinnova, 2021-02481Vinnova, 2020-02974Vinnova, 2023-02694
Available from: 2026-02-06 Created: 2026-02-06 Last updated: 2026-02-06Bibliographically approved

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