Chinese Optics, Volume. 17, Issue 4, 823(2024)
Detection of surface and internal defects in cold rolled steel
Fig. 3. Detecting scratches captured at different angles by camera不同相机拍摄角下的检测划痕
Fig. 5. Simulation results of scratches illuminated by different light sources
Fig. 9. Precision-Recall curve for different defects under white line light source and white bilateral line light source illumination. (a) Inclusion; (b) tree grain; (c) scratch
Fig. 10. Variation of mAP:0.5 with the epochs under white line light source and white bilateral line light source illumination
Table 1. Defect size in cold rolled steel samples
View tableView in ArticleTable 1. Defect size in cold rolled steel samples
缺陷类型 长度均值/cm 不确定度 宽度均值/cm 不确定度 孔洞 0.896 0.035 0.512 0.020 破损 4.960 0.025 1.204 0.030 夹杂 15.52 0.74 0.162 0.091 树纹 8.242 0.030 0.200 0.025 划痕 20.49 0.74 0.0222 0.0084 色差 19.70 0.74 5.994 0.030
Table 2. Imaging comparison when using white lateral and white bilateral line light source illuminations
View tableView in ArticleTable 2. Imaging comparison when using white lateral and white bilateral line light source illuminations
孔洞 破损 夹杂 树纹 纵向划痕 横向划痕 色差 白光单侧线光源 
白光双侧线光源 
Table 3. Results of YOLOv5 target detection algorithm using white line light source and white bilateral line light source illuminations
View tableView in ArticleTable 3. Results of YOLOv5 target detection algorithm using white line light source and white bilateral line light source illuminations
白光线光源 白光双侧线光源 准确率 80.80% 91.50%↑ 召回率 96.00% 97.67%↑ mAP:0.5 74.70% 90.16%↑ 损失值 1.38% 1.37% 孔洞 99.50% 99.50% 破损 99.60% 99.60% 夹杂 74.80% 89.80%↑ 树纹 74.60% 96.27%↑ 划痕 65.57% 83.90%↑ 色差 \ 73.00%
Table 4. Results of edge detection on blind hole sample by applying the Sobel algorithm
View tableView in ArticleTable 4. Results of edge detection on blind hole sample by applying the Sobel algorithm
工业CT 超声检测 红外热波成像 盲孔检出数 20 20 15 盲孔边缘连通数 20 19 13 边缘提取准确数 20 19 10 最大盲孔边缘灰度差值 φ2.50 mm 190 193 104 φ1.75 mm 187 180 80 φ1.00 mm 184 172 30 φ0.25 mm 145 89 /
Get Citation
Copy Citation Text
Ming-yu CHEN, Yue-chen XIE, Xiong-tao LV, Jian-rong GUO, Guo-jun JIA, Zhi-peng XU, Shi-ling WANG, Zhen XIANG, Dong LIU. Detection of surface and internal defects in cold rolled steel[J]. Chinese Optics, 2024, 17(4): 823
Received: Oct. 31, 2023
Accepted: --
Published Online: Aug. 9, 2024
The Author Email:
