Phase-Aware Spatial-Frequency Fusion for Few-Shot Fine-Grained Image Classification

• URL: http://arxiv.org/abs/2609.03829v2
• Date: Wed, 09 Sep 2026 08:28:55 GMT
• Title: Phase-Aware Spatial-Frequency Fusion for Few-Shot Fine-Grained Image Classification
• Abstract summary: Few-shot fine-grained image classification aims to classify similar images with limited labeled examples.<n>This work highlights the critical yet underutilized role of phase information in capturing structural relationships within an image.
• Score: 12.194880322318818
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Few-shot fine-grained image classification (FSFGIC) aims to classify similar images with limited labeled examples. This work highlights the critical yet underutilized role of phase information in capturing structural relationships within an image. This study introduces a novel plug-and-play amplitude-phase integration (API) module that effectively combines local and global frequency amplitude and phase information for obtaining more comprehensive feature descriptors. Additionally, a dedicated network, named PSF-Net, is proposed that adaptively fuses phase-based spatial and frequency information for FSFGIS. The designed PSF-Net can be easily integrated into standard episodic training architectures for end-to-end training from scratch. Extensive experiments on five public datasets demonstrate that the method outperforms existing state-of-the-art benchmarks.

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