Cross-Modal Alignment of Local and Global Features for Zero-Shot Chinese Character Recognition
Hongyi Cai, Anna Zhu · 2024
Chinese character recognition (CCR) is a pivotal domain in computer vision due to its complexity and diverse applications, especially given the extensive character categories posing challenges in identifying unseen characters. Addressing the zero-shot hurdle, we propose a CLIP-style model, which independently extracts features from aligned Chinese character images and Ideographic Description Sequences (IDS), achieving cross-modal alignment. Our approach encompasses local and global feature alignment. Initially, we introduce learnable discrete tokens to represent shared embeddings for visual and textual modalities, capturing the local context of Chinese characters. Then, encoding each radical extracts local features, mapped to shared discrete tokens via attention mechanisms. Additionally, encoding the entire character obtains global features. Training utilizes contrastive loss to facilitate cross-modal alignment. Experimental results confirm our method’s superiority over conventional approaches, demonstrating remarkable performance on zero-shot Chinese character recognition benchmarks.