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Jangwon Lee

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Preprint Aug 2026

Look Inside Each Video: Rethinking How Video Anomaly Detection Is Evaluated

A limitation of pooled VAD evaluation is revealed and reporting within-video ranking alongside Micro-AUROC is motivated and motivates reporting within-video ranking alongside Micro-AUROC.

Inpyo Song, Jangwon Lee · 0 citations
Preprint Aug 2026

A VLM Answer Is Not an Anomaly Score: Rank Compression Across Image and Video Anomaly Detection

Anomaly detection aims to identify observations that deviate from normal patterns. Recent work has increasingly used pretrained vision--language models (VLMs) for training-free image and video anomaly detection without task-specific retraining. Anomaly detection is commonly evaluated by how well anomaly scores rank ano...

Inpyo Song, Jangwon Lee · 2 citations
Preprint Aug 2026

Frame-Level Evaluation in Weakly Supervised Video Anomaly Detection Mostly Measures Video-Level Ranking

Weakly supervised video anomaly detectors are trained with video-level labels but are commonly evaluated as temporal localizers using Micro-AUROC or AP over pooled test frames. Because these metrics compare frames from different videos, a detector can score well by separating videos without accurately ordering moments...

Inpyo Song, Jangwon Lee · 0 citations

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