Cross-Domain Semantic-Enhanced Adaptive Graph Fusion Network for Robust Skeleton Action Recognition

Human action recognition (HAR) remains challenging, particularly for skeleton-based methods due to issues like domain shift and limited deep semantic understanding. Traditional Graph Convolutional Networks often struggle with effective cross-domain adaptation and inferring complex semantic relationships. To address these limitations, we propose CD-SEAFNet, a novel framework meticulously designed to significantly enhance robustness and cross-domain generalization for skeleton-based action recognition. CD-SEAFNet integrates three core modules: an Adaptive Spatio-Temporal Graph Feature Extractor that dynamically learns and adjusts graph structures to capture nuanced spatio-temporal dynamics; a Semantic Context Encoder and Fusion Module which leverages natural language descriptions to inject high-level semantic understanding via a cross-modal adaptive fusion mechanism; and a Domain Alignment and Classification Module that employs adversarial training and contrastive learning to generate domain-invariant, yet discriminative, features. Extensive experiments on the challenging NTU RGB+D datasets demonstrate that CD-SEAFNet consistently outperforms state-of-the-art methods across various evaluation protocols, unequivocally validating the synergistic effectiveness of our adaptive graph structure, semantic enhancement, and robust domain alignment strategies.