A Novel Bearing Roller Surface Defect Extraction Method Based on Double Threshold Adaptive Segmentation

2019 ◽  
Vol 09 (02) ◽  
pp. 314-322
Author(s):  
礼燕 易
Keyword(s):  
Extraction Method ◽  
Surface Defect ◽  
Adaptive Segmentation ◽  
Roller Surface ◽  
Defect Extraction ◽  
Double Threshold

Computer Extraction and Recognition Method Research on Weld Defect

2013 ◽  
Vol 739 ◽  
pp. 210-213
Author(s):  
Peng Lin Zhang ◽  
Zheng Bin Wu ◽  
Xian Ming Niu ◽  
Zhi Qiang Zhao
Keyword(s):  
Extraction Method ◽  
Recognition Rate ◽  
Recognition Method ◽  
Image Preprocessing ◽  
Weld Defect ◽  
Feature Parameter ◽  
Defect Recognition ◽  
Image Defect ◽  
High Lead ◽  
Defect Extraction

This paper carry out a kind of defect extraction method .Aiming at the weld image defect extraction accuracy is not high and defect feature selection is undeserved, thus affecting defect recognition rate is not high lead to falsely accused of miscarriage of justice on this condition.Based on image preprocessing to remove noise and strengthen the image, and then the image analysis so as to extract defect finally take defect marking defect feature parameter selection, in order to accurately identify defect.

Evaluation of the dark field method for large association of spread DNA

1978 ◽  
Vol 36 (2) ◽  
pp. 190-191
Author(s):  
Douglas C. Barker
Keyword(s):  
Electron Microscopy ◽  
Molecular Weight ◽  
Mitochondrial Dna ◽  
Extraction Method ◽  
Field Method ◽  
Dark Field ◽  
Kinetoplast Dna ◽  
Field Electron ◽  
Field Electron Microscopy ◽  
Dark Field Electron

A number of satisfactory methods are available for the electron microscopy of nicleic acids. These methods concentrated on fragments of nuclear, viral and mitochondrial DNA less than 50 megadaltons, on denaturation and heteroduplex mapping (Davies et al 1971) or on the interaction between proteins and DNA (Brack and Delain 1975). Less attention has been paid to the experimental criteria necessary for spreading and visualisation by dark field electron microscopy of large intact issociations of DNA. This communication will report on those criteria in relation to the ultrastructure of the (approx. 1 x 10-14g) DNA component of the kinetoplast from Trypanosomes. An extraction method has been developed to eliminate native endonucleases and nuclear contamination and to isolate the kinetoplast DNA (KDNA) as a compact network of high molecular weight. In collaboration with Dr. Ch. Brack (Basel [nstitute of Immunology), we studied the conditions necessary to prepare this KDNA Tor dark field electron microscopy using the microdrop spreading technique.

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