Canny edge detection

EdgeFlow: Edge-Map Augmented VLM-Based Flowchart Processing for Industrial Requirements Engineering

EdgeFlow augments Vision Language Models with deterministically extracted Canny edge maps as structural priors to improve flowchart-to-Mermaid conversion in industrial requirements engineering, requiring no annotated training data or fine-tuning. Evaluated on IndusReqFlow, a real-world industrial dataset, it achieves +17.39 pp node-level F1 and +16.94 pp edge-level F1 over off-the-shelf VLMs. Cross-dataset evaluation on a synthetic benchmark shows no significant gains, highlighting the gap between synthetic and industrial benchmarks for VLM-based RE tools.