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Johan Verjans

3 accepted papers

2026

Beyond the Global Scores: Fine-Grained Token Grounding as a Robust Detector of LVLM Hallucinations

CVPR 2026

Large vision-language models (LVLMs) achieve strong performance on visual reasoning tasks but remain highly susceptible to hallucination. Existing detection methods predominantly rely on coarse, whole-image measures of how an object token relates to the input image. This global strategy is limited:

Cited by 0SourceScholar
2026

Spectral Flow Matching: Stabilizing Stochastic GFlowNets via Frequency-Domain Regularization

ICML 2026poster

Generative Flow Networks (GFNs) offer a powerful paradigm for diverse sampling, yet they often exhibit instability and poor convergence when applied to stochastic or sparse-reward environments. To mitigate the high variance inherent in these settings, we propose a fundamental re-framing of the GFlow…

Cited by 0SourceScholar
2025

Localizing Before Answering: A Benchmark for Grounded Medical Visual Question Answering

IJCAI 2025

Medical Large Multi-modal Models (LMMs) have demonstrated remarkable capabilities in medical data interpretation. However, these models frequently generate hallucinations contradicting source evidence, particularly due to inadequate localization reasoning. This work reveals a critical limitation in

Cited by 0SourcePDFScholar