ResearchResearch paperComputer Vision1 source · Oct 20, 2026

FocusOVD: Geometric and Contextual Feature Refinement for Open-Vocabulary Small-Object Detection

To address these challenges, we propose FocusOVD, an open-vocabulary object detector that enhances small-object representations without modifying the frozen VLM backbone.

Key points

  • Open-vocabulary object detection aims to detect both seen and unseen categories by leveraging the semantic knowledge of vision-language models.
  • However, existing methods often struggle with small objects due to insufficient preservation of high-resolution details, ineffective information aggregation across feature levels, and limited region-level discriminability.
  • Extensive experiments on COCO-OVD and LVIS-OVD demonstrate the effectiveness of FocusOVD.
  • On COCO-OVD, FocusOVD achieves a novel-category AP of 36.3%, outperforming CORA, UniDetector, and SAMP by 1.3%, 1.1%, and 1.5%, respectively; on LVIS-OVD, it achieves an overall AP of 33.7%, surpassing the strongest competing method by 0.6%.

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