M2P-AD: Memory-to-Prototype Learning with Boundary-aware Score Refinement for 3D Anomaly Detection
This work addresses the challenges of over-response in normal regions and false positives near object boundaries in 3D anomaly detection by proposing a novel approach that integrates a Memory-to-Prototype (M2P) module with a Boundary-aware Score Refinement (BSR) strategy. The M2P module leverages a memory bank to learn representative prototypes of normal features, enabling precise modeling of the normal distribution. Concurrently, a boundary extraction module is introduced to facilitate structure-aware correction of anomaly scores through BSR, effectively preserving geometric integrity while suppressing boundary artifacts. Evaluated on Real3D-AD, Anomaly-ShapeNet, and MulSen-AD datasets, the proposed method significantly reduces false alarms in normal regions and boundary-related false positives, achieving more accurate and robust anomaly localization and outperforming current state-of-the-art methods.