DiAD: A Diffusion-based Framework for Multi-class Anomaly Detection
On the map: Diffusion models → Flow matching, time series and science
Abstract (arXiv)
Reconstruction-based approaches have achieved remarkable outcomes in anomaly detection. The exceptional image reconstruction capabilities of recently popular diffusion models have sparked research efforts to utilize them for enhanced reconstruction of anomalous images. Nonetheless, these methods might face challenges related to the preservation of image categories and pixel-wise structural integrity in the more practical multi-class setting. To solve the above problems, we propose a Difusion-based Anomaly Detection (DiAD) framework for multi-class anomaly detection, which consists of a pixel-space autoencoder, a latent-space Semantic-Guided (SG) network with a connection to the stable diffusion's denoising network, and a feature-space pre-trained feature extractor. Firstly, The SG network is proposed for reconstructing anomalous regions while preserving the original image's semantic information. Secondly, we introduce Spatial-aware Feature Fusion (SFF) block to maximize reconstruction accuracy when dealing with extensively reconstructed areas. Thirdly, the input and reconstructed images are processed by a pre-trained feature extractor to generate anomaly maps based on features extracted at different scales. Experiments on MVTec-AD and VisA datasets demonstrate the effectiveness of our approach which surpasses the state-of-the-art methods, e.g., achieving 96.8/52.6 and 97.2/99.0 (AUROC/AP) for localization and detection respectively on multi-class MVTec-AD dataset. Code will be available at https://lewandofskee.github.io/projects/diad.
Key facts. Cited by 33 papers in the map (data through 7 Oct 2026). Placed in Flow matching, time series and science, one of 14 directions in Diffusion models. Builds on 43 of its 59 references that are in the map. First posted on arXiv 11 Dec 2023.
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Citing papers per year: 2023: 1; 2024: 16; 2025: 13; 2026: 3.
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- 2024AdaCLIP: Adapting CLIP with Hybrid Learnable Prompts for Zero-Shot Anomaly Detectioncited by 126
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- 2026HAAF: Hierarchical Adaptation and Alignment of Foundation Models for Few-Shot Pathology Anomaly Detection24 Jan 2026
- 2025ADPretrain: Advancing Industrial Anomaly Detection via Anomaly Representation Pretraining7 Nov 2025
- 2025MIRAD - A comprehensive real-world robust anomaly detection dataset for Mass Individualization18 Oct 2025
- 2025UniMMAD: Unified Multi-Modal and Multi-Class Anomaly Detection via MoE-Driven Feature Decompression30 Sep 2025
- 2025ResAD++: Towards Class Agnostic Anomaly Detection via Residual Feature Learning28 Sep 2025
- 2025SP-Mamba: Spatial-Perception State Space Model for Unsupervised Medical Anomaly Detection25 Jul 2025
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- 2024CLIP-FSAC++: Few-Shot Anomaly Classification with Anomaly Descriptor Based on CLIP5 Dec 2024
- 2024Friend or Foe? Harnessing Controllable Overfitting for Anomaly Detection30 Nov 2024
- 2024ROADS: Robust Prompt-driven Multi-Class Anomaly Detection under Domain Shift25 Nov 2024
- 2024VQ-Flow: Taming Normalizing Flows for Multi-Class Anomaly Detection via Hierarchical Vector Quantization2 Sep 2024
- 2024AdaCLIP: Adapting CLIP with Hybrid Learnable Prompts for Zero-Shot Anomaly Detection22 Jul 2024
- 2024Enhancing Multi-Class Anomaly Detection via Diffusion Refinement with Dual Conditioning2 Jul 2024
- 2024Prior Normality Prompt Transformer for Multi-class Industrial Image Anomaly Detection17 Jun 2024
- 2024GLAD: Towards Better Reconstruction with Global and Local Adaptive Diffusion Models for Unsupervised Anomaly Detection11 Jun 2024
- 2024M3DM-NR: RGB-3D Noisy-Resistant Industrial Anomaly Detection via Multimodal Denoising4 Jun 2024
- 2024A Study on Unsupervised Anomaly Detection and Defect Localization using Generative Model in Ultrasonic Non-Destructive Testing26 May 2024
- 2024Dinomaly: The Less Is More Philosophy in Multi-Class Unsupervised Anomaly Detection23 May 2024
- 2024MiniMaxAD: A Lightweight Autoencoder for Feature-Rich Anomaly Detection16 May 2024
- 2024DMAD: Dual Memory Bank for Real-World Anomaly Detection19 Mar 2024
- 2024Anomaly Detection by Adapting a pre-trained Vision Language Model14 Mar 2024
- 2024Dual-path Frequency Discriminators for Few-shot Anomaly Detection7 Mar 2024
- 2024A Survey on Visual Anomaly Detection: Challenge, Approach, and Prospect29 Jan 2024
- 2023Exploring Plain ViT Reconstruction for Multi-class Unsupervised Anomaly Detection12 Dec 2023
- 2024GLAD: Towards Better Reconstruction with Global and Local Adaptive Diffusion Models for Unsupervised Anomaly Detectioncited by 42
- 2025Anomaly Detection and Generation with Diffusion Models: A Surveycited by 8
- 2026Industrial Surface Defect Detection via Diffusion Generation and Asymmetric Student-Teacher Networkcited by 0
- 2026Industrial Surface Defect Detection via Diffusion Generation and Asymmetric Student-Teacher Network21 Apr 2026
- 2025Anomaly Detection and Generation with Diffusion Models: A Survey11 Jun 2025
- 2024GLAD: Towards Better Reconstruction with Global and Local Adaptive Diffusion Models for Unsupervised Anomaly Detection11 Jun 2024
- 2024Anomaly Detection by Adapting a pre-trained Vision Language Modelcited by 1
- 2025IQE-CLIP: Instance-aware Query Embedding for Zero-/Few-shot Anomaly Detection in Medical Domaincited by 1
- 2026MMR-AD: A Large-Scale Multimodal Dataset for Benchmarking General Anomaly Detection with Multimodal Large Language Modelscited by 1
- 2026MMR-AD: A Large-Scale Multimodal Dataset for Benchmarking General Anomaly Detection with Multimodal Large Language Models13 Apr 2026
- 2025IQE-CLIP: Instance-aware Query Embedding for Zero-/Few-shot Anomaly Detection in Medical Domain12 Jun 2025
- 2024Anomaly Detection by Adapting a pre-trained Vision Language Model14 Mar 2024
- 2024AdaCLIP: Adapting CLIP with Hybrid Learnable Prompts for Zero-Shot Anomaly Detectioncited by 126
- 2024Dinomaly: The Less Is More Philosophy in Multi-Class Unsupervised Anomaly Detectioncited by 92
- 2025AA-CLIP: Enhancing Zero-shot Anomaly Detection via Anomaly-Aware CLIPcited by 72
- 2024A Survey on Visual Anomaly Detection: Challenge, Approach, and Prospectcited by 69
- 2023Exploring Plain ViT Reconstruction for Multi-class Unsupervised Anomaly Detectioncited by 47
- 2024M3DM-NR: RGB-3D Noisy-Resistant Industrial Anomaly Detection via Multimodal Denoisingcited by 24
- 2024Prior Normality Prompt Transformer for Multi-class Industrial Image Anomaly Detectioncited by 19
- 2024Dual-path Frequency Discriminators for Few-shot Anomaly Detectioncited by 7
- 2025Towards Accurate Unified Anomaly Segmentationcited by 7
- 2025One-to-Normal: Anomaly Personalization for Few-shot Anomaly Detectioncited by 7
- 2025FastRef:Fast Prototype Refinement for Few-Shot Industrial Anomaly Detectioncited by 6
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- 2026HAAF: Hierarchical Adaptation and Alignment of Foundation Models for Few-Shot Pathology Anomaly Detection24 Jan 2026
- 2025ADPretrain: Advancing Industrial Anomaly Detection via Anomaly Representation Pretraining7 Nov 2025
- 2025MIRAD - A comprehensive real-world robust anomaly detection dataset for Mass Individualization18 Oct 2025
- 2025ResAD++: Towards Class Agnostic Anomaly Detection via Residual Feature Learning28 Sep 2025
- 2025FastRef:Fast Prototype Refinement for Few-Shot Industrial Anomaly Detection26 Jun 2025
- 2025Bi-Grid Reconstruction for Image Anomaly Detection1 Apr 2025
- 2025AA-CLIP: Enhancing Zero-shot Anomaly Detection via Anomaly-Aware CLIP9 Mar 2025
- 2025PA-CLIP: Enhancing Zero-Shot Anomaly Detection through Pseudo-Anomaly Awareness3 Mar 2025
- 2025One-to-Normal: Anomaly Personalization for Few-shot Anomaly Detection3 Feb 2025
- 2025Towards Accurate Unified Anomaly Segmentation21 Jan 2025
- 2024CLIP-FSAC++: Few-Shot Anomaly Classification with Anomaly Descriptor Based on CLIP5 Dec 2024
- 2024Friend or Foe? Harnessing Controllable Overfitting for Anomaly Detection30 Nov 2024
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