A Self-Structure-Enhanced Algorithm for Pig Point Cloud Completion

Three-dimensional phenotypic data of pigs provide important information for evaluating growth, nutritional status and health, and they are fundamental to precision feeding, performance assessments, genetic selection and intelligent livestock management. However, point clouds acquired in real pig-house environments are frequently incomplete because of occlusion, limited camera viewpoints, surface reflection, sensor noise, etc. To address local missing structures and geometric discontinuities in pig point clouds, this paper proposes a self-structure-enhanced completion method. The method follows a global-to-local two-stage framework. In the global stage, a self-view fusion network (SVFNet) integrates an incomplete point cloud and its three orthogonal self-projected depth maps to generate a coarse complete shape. In the local stage, a self-structure dual generator (SDG) progressively refines and upsamples the coarse result through a structure analysis and a similarity alignment. To address the physical limitation of distinguishing single-view occlusion from true missingness, this paper proposes a visibility-incompleteness mask (VIM) as the primary contribution, which explicitly models both geometric missingness and multi-view visibility. Furthermore, a prior-adaptive hybrid generation (PAHG) strategy is introduced as a secondary enhancement to combine learnable global shape priors with input-adaptive geometric queries. A dataset containing 1042 complete-incomplete pig point cloud pairs with six typical missing patterns was constructed for model training and evaluation. The proposed method achieved an F-Score@1% of 0.653, a CD-L1 of 9.766, and a CD-L2 of 0.353 on the test set, demonstrating a competitive aggregate performance compared with state-of-the-art completion methods, with trade-offs across different geometric metrics.