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Optimizing Text Recognition in Mechanical Drawings: A Comprehensive Approach
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Produktrealisering. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-5950-4962
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Produktrealisering. Linköpings universitet, Tekniska fakulteten.
2025 (engelsk)Inngår i: Machines, E-ISSN 2075-1702, Vol. 13, nr 3, artikkel-id 254Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
MDPI , 2025. Vol. 13, nr 3, artikkel-id 254
Emneord [en]
mechanical drawings; optical character recognition; intelligent document processing; quality control; vision language models
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-212838DOI: 10.3390/machines13030254ISI: 001452775200001Scopus ID: 2-s2.0-105001120622OAI: oai:DiVA.org:liu-212838DiVA, id: diva2:1950437
Merknad

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

Tilgjengelig fra: 2025-04-07 Laget: 2025-04-07 Sist oppdatert: 2026-02-06
Inngår i avhandling
1. Learning-Based Methods for Visual Understanding in Engineering and Production Workflows
Åpne denne publikasjonen i ny fane eller vindu >>Learning-Based Methods for Visual Understanding in Engineering and Production Workflows
2026 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 2026. s. 62
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2506
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-221069 (URN)10.3384/9789181184648 (DOI)9789181184631 (ISBN)9789181184648 (ISBN)
Disputas
2026-03-05, ACAS, A-building, Campus Valla, Linköping, 13:15 (engelsk)
Opponent
Veileder
Forskningsfinansiär
Vinnova, 2021-02481Vinnova, 2020-02974Vinnova, 2023-02694
Tilgjengelig fra: 2026-02-06 Laget: 2026-02-06 Sist oppdatert: 2026-02-06bibliografisk kontrollert

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