{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T07:40:57Z","timestamp":1765438857930,"version":"build-2065373602"},"reference-count":43,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,4,14]],"date-time":"2023-04-14T00:00:00Z","timestamp":1681430400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003716","name":"Korea Basic Science Institute","doi-asserted-by":"publisher","award":["2021R1A6C101B382"],"award-info":[{"award-number":["2021R1A6C101B382"]}],"id":[{"id":"10.13039\/501100003716","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Continuous efforts were made in detecting cracks in images. Varied CNN models were developed and tested for detecting or segmenting crack regions. However, most datasets used in previous works contained clearly distinctive crack images. No previous methods were validated on blurry cracks captured in low definitions. Therefore, this paper presented a framework of detecting the regions of blurred, indistinct concrete cracks. The framework divides an image into small square patches which are classified into crack or non-crack. Well-known CNN models were employed for the classification and compared with each other with experimental tests. This paper also elaborated on critical factors\u2014the patch size and the way of labeling patches\u2014which had considerable influences on the training performance. Furthermore, a series of post-processes for measuring crack lengths were introduced. The proposed framework was tested on the images of bridge decks containing blurred thin cracks and showed reliable performance comparable to practitioners.<\/jats:p>","DOI":"10.3390\/s23083990","type":"journal-article","created":{"date-parts":[[2023,4,14]],"date-time":"2023-04-14T09:23:43Z","timestamp":1681464223000},"page":"3990","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Detection and Length Measurement of Cracks Captured in Low Definitions Using Convolutional Neural Networks"],"prefix":"10.3390","volume":"23","author":[{"given":"Jin-Young","family":"Kim","sequence":"first","affiliation":[{"name":"Sambo Engineering, Seoul 05640, Republic of Korea"}]},{"given":"Man-Woo","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, Myongji University, Yongin 17058, Republic of Korea"}]},{"given":"Nhut Truong","family":"Huynh","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, Myongji University, Yongin 17058, Republic of Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7557-9553","authenticated-orcid":false,"given":"Changsu","family":"Shim","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, Chung-Ang University, Seoul 06974, Republic of Korea"}]},{"given":"Jong-Woong","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, Chung-Ang University, Seoul 06974, Republic of Korea"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Fujita, Y., Mitani, Y., and Hamamoto, Y. 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