AnomalySD: Few-Shot Multi-Class Anomaly Detection with Stable Diffusion Model
This addresses the need for flexible and cost-effective anomaly detection in industrial settings where data is limited, though it is incremental as it builds upon existing Stable Diffusion models.
The paper tackles the problem of few-shot multi-class anomaly detection in industrial manufacturing by proposing AnomalySD, a framework that adapts Stable Diffusion for inpainting anomalous regions as normal, achieving anomaly classification and segmentation results of 93.6%/94.8% AUROC on MVTec-AD and 86.1%/96.5% AUROC on VisA datasets under multi-class and one-shot settings.
Anomaly detection is a critical task in industrial manufacturing, aiming to identify defective parts of products. Most industrial anomaly detection methods assume the availability of sufficient normal data for training. This assumption may not hold true due to the cost of labeling or data privacy policies. Additionally, mainstream methods require training bespoke models for different objects, which incurs heavy costs and lacks flexibility in practice. To address these issues, we seek help from Stable Diffusion (SD) model due to its capability of zero/few-shot inpainting, which can be leveraged to inpaint anomalous regions as normal. In this paper, a few-shot multi-class anomaly detection framework that adopts Stable Diffusion model is proposed, named AnomalySD. To adapt SD to anomaly detection task, we design different hierarchical text descriptions and the foreground mask mechanism for fine-tuning SD. In the inference stage, to accurately mask anomalous regions for inpainting, we propose multi-scale mask strategy and prototype-guided mask strategy to handle diverse anomalous regions. Hierarchical text prompts are also utilized to guide the process of inpainting in the inference stage. The anomaly score is estimated based on inpainting result of all masks. Extensive experiments on the MVTec-AD and VisA datasets demonstrate the superiority of our approach. We achieved anomaly classification and segmentation results of 93.6%/94.8% AUROC on the MVTec-AD dataset and 86.1%/96.5% AUROC on the VisA dataset under multi-class and one-shot settings.