[2604.06770] FlowExtract: Procedural Knowledge Extraction from Maintenance Flowcharts

Computer Science > Computer Vision and Pattern Recognition arXiv:2604.06770 (cs) [Submitted on 8 Apr 2026] Title:FlowExtract: Procedural Knowledge Extraction from Maintenance Flowcharts Authors:Guillermo Gil de Avalle, Laura Maruster, Eric Sloot, Christos Emmanouilidis View a PDF of the paper titled FlowExtract: Procedural Knowledge Extraction from Maintenance Flowcharts, by Guillermo Gil de Avalle and 2 other authors View PDF HTML (experimental) Abstract:Maintenance procedures in manufacturing facilities are often documented as flowcharts in static PDFs or scanned images. They encode procedural knowledge essential for asset lifecycle management, yet inaccessible to modern operator support systems. Vision-language models, the dominant paradigm for image understanding, struggle to reconstruct connection topology from such diagrams. We present FlowExtract, a pipeline for extracting directed graphs from ISO 5807-standardized flowcharts. The system separates element detection from connectivity reconstruction, using YOLOv8 and EasyOCR for standard domain-aligned node detection and text extraction, combined with a novel edge detection method that analyzes arrowhead orientations and traces connecting lines backward to source nodes. Evaluated on industrial troubleshooting guides, FlowExtract achieves very high node detection and substantially outperforms vision-language model baselines on edge extraction, offering organizations a practical path toward queryable procedural knowledg...