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arXiv · 2604.02905

UniSpector: Towards Universal Open-set Defect Recognition via Spectral-Contrastive Visual Prompting

Geonuk Kim·Minhoi Kim·Kangil Lee·Minsu Kim·Hyeonseong Jeon·Jeonghoon Han·Hyoungjoon Lim·Junho Yim
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Abstract

Although industrial inspection systems should be capable of recognizing unprecedented defects, most existing approaches operate under a closed-set assumption, which prevents them from detecting novel anomalies. While visual prompting offers a scalable alternative for industrial inspection, existing methods often suffer from prompt embedding collapse due to high intra-class variance and subtle inter-class differences. To resolve this, we propose UniSpector, which shifts the focus from naive prompt-to-region matching to the principled design of a semantically structured and transferable prompt topology. UniSpector employs the Spatial-Spectral Prompt Encoder to extract orientation-invariant, fine-grained representations; these serve as a solid basis for the Contrastive Prompt Encoder to explicitly regularize the prompt space into a semantically organized angular manifold. Additionally, Prompt-guided Query Selection generates adaptive object queries aligned with the prompt. We introduce Inspect Anything, the first benchmark for visual-prompt-based open-set defect localization, where UniSpector significantly outperforms baselines by at least 19.7% and 15.8% in AP50b and AP50m, respectively. These results show that our method enable a scalable, retraining-free inspection paradigm for continuously evolving industrial environments, while offering critical insights into the design of generic visual prompting.

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Geonuk Kim, Minhoi Kim, Kangil Lee, Minsu Kim, Hyeonseong Jeon, Jeonghoon Han, Hyoungjoon Lim, Junho Yim. 2026-04-03. UniSpector: Towards Universal Open-set Defect Recognition via Spectral-Contrastive Visual Prompting. https://arxiv.org/abs/2604.02905

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