Journal of Applied Optics, Volume. 43, Issue 5, 904(2022)
Thread image evaluation method based on machine vision
Figures & Tables(21)
Fig. 6. Diagram of information entropy evaluation value of thread image
Fig. 12. Diagram of relationship between M14×2 thread angle error and evaluation value
Fig. 13. Diagram of relationship between M20×1.5 thread angle error and evaluation value
Fig. 14. Diagram of relationship between M20×2.5 thread angle error and evaluation value
Table 1. Gradient evaluation value of thread image
View tableView in ArticleTable 1. Gradient evaluation value of thread image
样本序号 评价值 1 0.4782 2 0.3723 3 0.0126 4 0.5725 5 0.4324 6 0.9827 7 0.1624 8 0.2939 9 0.4762 10 0.1231
Table 2. Information entropy evaluation value of thread image
View tableView in ArticleTable 2. Information entropy evaluation value of thread image
样本序号 评价值 1 0.9653 2 0.7863 3 0.5824 4 0.6872 5 0.5635 6 0.4836 7 0.9946 8 0.1526 9 0.2735 10 0.5369
Table 3. Contrast evaluation value of thread image
View tableView in ArticleTable 3. Contrast evaluation value of thread image
样本序号 评价值 1 0.0216 2 0.1563 3 0.2321 4 0.4348 5 0.5262 6 0.7216 7 0.6323 8 0.7579 9 0.8323 10 0.9874
Table 4. L-yakuo thread image evaluation value
View tableView in ArticleTable 4. L-yakuo thread image evaluation value
样本序号 规格 M14×2 M20×2.5 M20×1.5 1 0.0246 0.0163 0.0259 2 0.0249 0.0160 0.0259 3 0.0250 0.0158 0.0616 4 0.0250 0.0155 0.0632 5 0.0250 0.0152 0.0643 6 0.0249 0.0147 0.0660 7 0.0249 0.0142 0.0660 8 0.0249 0.0137 0.0649 9 0.0248 0.0132 0.0677 10 0.0248 0.0127 0.0662
Table 5. M14×2 thread angle measurement value by machine vision
View tableView in ArticleTable 5. M14×2 thread angle measurement value by machine vision
样本序号 左牙侧角 右牙侧角 牙型角 1 30°01′44″ 29°59′23″ 60°01′07″ 2 30°00′43″ 29°59′42″ 60°00′25″ 3 29°58′40″ 29°59′45″ 59°58′23″ 4 29°56′38″ 29°59′45″ 59°55′23″ 5 29°52′48″ 29°58′48″ 59°52′36″ 6 29°54′55″ 29°59′56″ 59°53′51″ 7 29°55′17″ 30°01′21″ 59°56′38″ 8 29°56′52″ 30°01′04″ 59°57′56″ 9 29°57′02″ 30°01′23″ 59°58′05″ 10 29°57′31″ 30°01′28″ 59°58′59″
Table 6. M20×1.5 thread angle measurement value by machine vision
View tableView in ArticleTable 6. M20×1.5 thread angle measurement value by machine vision
样本序号 左牙侧角 右牙侧角 牙型角 1 29°37′11″ 30°32′45″ 60°08′56″ 2 29°36′35″ 30°32′01″ 60°07′36″ 3 29°36′08″ 30°31′33″ 60°06′41″ 4 29°35′33″ 30°30′51″ 60°05′24″ 5 29°35′07″ 30°30′23″ 60°04′30″ 6 29°34′56″ 30°29′47″ 60°03′43″ 7 29°34′15″ 30°29′24″ 60°02′39″ 8 29°33′28″ 30°29′09″ 60°01′37″ 9 29°31′47″ 30°28′35″ 59°59′22″ 10 29°30′23″ 30°27′58″ 59°57′21″
Table 7. M20×2.5 thread angle measurement value by machine vision
View tableView in ArticleTable 7. M20×2.5 thread angle measurement value by machine vision
样本序号 左牙侧角 右牙侧角 牙型角 1 29°31′14″ 30°38′45″ 60°09′59″ 2 29°31′35″ 30°37′01″ 60°08′36″ 3 29°32′07″ 30°35′32″ 60°07′39″ 4 29°32′39″ 30°34′45″ 60°07′24″ 5 29°33′48″ 30°33′08″ 60°06′56″ 6 29°34′16″ 30°32′16″ 60°06′32″ 7 29°35′15″ 30°30′51″ 60°06′06″ 8 29°36′47″ 30°29′54″ 60°05′41″ 9 29°36′55″ 30°28′12″ 60°04′7″ 10 29°37′02″ 30°26′03″ 60°03′05″
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Jie WANG, Manlong CHEN, Kui LI, Fan YANG, Lizhi YAN. Thread image evaluation method based on machine vision[J]. Journal of Applied Optics, 2022, 43(5): 904
Paper Information
Category: OE INFORMATION ACQUISITION AND PROCESSING
Received: Dec. 13, 2021
Accepted: --
Published Online: Oct. 12, 2022
The Author Email: Manlong CHEN (yilu.yang@yahoo.com.cn)
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