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JING Tianchi,SUN Xiaoming,HAO Liang,et al.Steel surface defect detection based on DFD-DETR with dual-frequency enhancement and dynamic kernel guidance[J].Optics and Precision Engineering,2026,34(15):2422-2437.DOI: 10.37188/OPE.20263415.2422. CSTR: 32169.14.OPE.20263415.2422.