SKYDET: An End-to-End Multiscale Attentive Detection Network From Foundation Models for Small Objects in Remote Sensing Images
Remote sensing object detection remains a highly challenging task due to drastic variations in target scale, dense distributions of small objects, and complex background interference. Although existing detectors have achieved notable progress, they heavily rely on large-scale supervised pretraining and often suffer from substantial domain gaps and expensive annotation costs. In recent years, vision foundation models (VFMs) have demonstrated strong general-purpose representation capability, yet their potential in remote sensing imagery has not been fully explored. To bridge this gap, we propose SKYDET, an end-to-end robust object detection framework that explicitly migrates the billion-parameter DINOv3 model to the aerial domain. To effectively bridge the domain gap and prevent representation manifold degradation, we freeze the pretrained foundation model and propose a semantic guiding adapter (SGA) that acts as a precise semantic filter to suppress irrelevant background clutter. In addition, to address feature misalignment and semantic ambiguity during cross-scale fusion, we introduce a cross-fused encoder (CFE), whose core component is the reciprocal guidance module (RGM). The RGM establishes a reciprocal enhancement mechanism that enables spatial structure and channel semantics to guide each other, thereby effectively suppressing background noise and strengthening responses to small objects. Extensive experiments on three challenging benchmark datasets—DOTA-v1.0, AI-TOD, and NWPU VHR-10—demonstrate highly competitive performance. Specifically, SKYDET-C achieves state-of-the-art (SOTA) detection precision (with $AP_{50}$ scores of 72.6%, 56.1%, and 95.6%, respectively), while SKYDET-T exhibits superior advantages in high-precision localization tasks. This validates the effectiveness of transferring VFM knowledge to remote sensing tasks. Our code is available at https://github.com/zhangyyy-ai-rs/SKYDET