Papers › PyramidFlow: High-Resolution Defect Contrastive Localization using Pyramid Normalizing Flow
PyramidFlow: High-Resolution Defect Contrastive Localization using Pyramid Normalizing Flow
Jiarui Lei, Xiaobo Hu, Yue Wang, Dong Liu
During industrial processing, unforeseen defects may arise in products due to uncontrollable factors. Although unsupervised methods have been successful in defect localization, the usual use of pre-trained models results in low-resolution outputs, which damages visual performance. To address this issue, we propose PyramidFlow, the first fully normalizing flow method without pre-trained models that enables high-resolution defect localization. Specifically, we propose a latent template-based defect contrastive localization paradigm to reduce intra-class variance, as the pre-trained models do. In addition, PyramidFlow utilizes pyramid-like normalizing flows for multi-scale fusing and volume normalization to help generalization. Our comprehensive studies on MVTecAD demonstrate the proposed method outperforms the comparable algorithms that do not use external priors, even achieving state-of-the-art performance in more challenging BTAD scenarios.
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Tasks
Results from the paper archive 2025-07-28
| Task | Dataset | Model | Metric | Value | Rank at snapshot | Leaderboard | Report |
|---|---|---|---|---|---|---|---|
| Anomaly Detection | BTAD | PyramidFlow (Res18) | Detection AUROC | 95.8 | #5 of 15 | Archive leaderboard | report |
| Anomaly Detection | BTAD | PyramidFlow (Res18) | Segmentation AUROC | 97.7 | #5 of 15 | Archive leaderboard | report |
| Anomaly Detection | MVTec AD | PyramidFlow (Res18) | Segmentation AUPRO | 96.5 | #125 of 148 | Archive leaderboard | report |
| Anomaly Detection | MVTec AD | PyramidFlow (Res18) | Segmentation AUROC | 97.1 | #125 of 148 | Archive leaderboard | report |
| Anomaly Detection | MVTec AD | PyramidFlow (FNF) | Segmentation AUPRO | 94.5 | #127 of 148 | Archive leaderboard | report |
| Anomaly Detection | MVTec AD | PyramidFlow (FNF) | Segmentation AUROC | 96.0 | #127 of 148 | Archive leaderboard | report |
Ranks are positions in the archive's leaderboards as they stood at the 2025-07-28 snapshot. Results published since then are not among these rows, so a rank here is not a current standing.
Methods
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