  Point cloud (PCD) anomaly detection steadily emerges as a promising research
area. This study aims to improve PCD anomaly detection performance by combining
handcrafted PCD descriptions with powerful pre-trained 2D neural networks. To
this end, this study proposes Complementary Pseudo Multimodal Feature (CPMF)
that incorporates local geometrical information in 3D modality using
handcrafted PCD descriptors and global semantic information in the generated
pseudo 2D modality using pre-trained 2D neural networks. For global semantics
extraction, CPMF projects the origin PCD into a pseudo 2D modality containing
multi-view images. These images are delivered to pre-trained 2D neural networks
for informative 2D modality feature extraction. The 3D and 2D modality features
are aggregated to obtain the CPMF for PCD anomaly detection. Extensive
experiments demonstrate the complementary capacity between 2D and 3D modality
features and the effectiveness of CPMF, with 95.15% image-level AU-ROC and
92.93% pixel-level PRO on the MVTec3D benchmark. Code is available on
https://github.com/caoyunkang/CPMF.
