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By introducing a multi-scale information gain mechanism and a global\u2013local feature coupling strategy, the model has significantly improved feature extraction and expression capabilities. Experimental results show that, on a single-crack dataset, the model\u2019s mAP@50 and mAP@50-95 are 1.6% and 0.8% higher than the baseline model RT-DETR, respectively; on a multi-crack dataset, these two indicators are improved by 1.2% and 1.0%, respectively. The proposed method shows good robustness and detection accuracy in complex scenarios, providing new ideas and technical support for in-depth research in the field of crack detection.<\/jats:p>","DOI":"10.3390\/e27020165","type":"journal-article","created":{"date-parts":[[2025,2,5]],"date-time":"2025-02-05T04:15:41Z","timestamp":1738728941000},"page":"165","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Crack-Detection Algorithm Integrating Multi-Scale Information Gain with Global\u2013Local Tight\u2013Loose Coupling"],"prefix":"10.3390","volume":"27","author":[{"given":"Yun","family":"Bai","sequence":"first","affiliation":[{"name":"School of Aviation, Inner Mongolia University of Technology, Hohhot 010021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyao","family":"Li","sequence":"additional","affiliation":[{"name":"School of Aviation, Inner Mongolia University of Technology, Hohhot 010021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Runqi","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Aviation, Inner Mongolia University of Technology, Hohhot 010021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayi","family":"Feng","sequence":"additional","affiliation":[{"name":"School of Aviation, Inner Mongolia University of Technology, Hohhot 010021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Biao","family":"Li","sequence":"additional","affiliation":[{"name":"School of Aviation, Inner Mongolia University of Technology, Hohhot 010021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Yang, Y., Li, L., Yao, G., Du, H., Chen, Y., and Wu, L. 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