| Image segmentation of small defects in precision weldments with complex structure |
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| 作者姓名： | 石端虎 刚铁 袁嫒 杨双羊 |
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| 作者单位： | State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001 |
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| 摘 要： | In this paper, the X-ray nondestructive test method of small defects in precision weldments with complex structure was presented. To resolve the difficulty of defect segmentation in variable grey image, the image processing based on Visual Basic programming method was adopted. The methods of automatic contrast and partial grey stretch were used to enhance the X-ray detection image which has relatively low contrast, then automatic threshold method was carried out to segment the two high intensity zones, and weld zones which contain the small defects was extracted. Smoothing and sharpen processing were proceeded on the extracted weld zones, and small defects in X-ray detection image of weldments with complex structure were segmented by using the method of background subtraction in the end. The effects of raster were eliminated, and because of that the image processing was only proceeded on the extracted weld zones, the calculated speed using the above provided algorithm was improved.
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| 关 键 词： | 精密焊接件 复杂结构 微小缺陷检测 图象分割 |
Image segmentation of small defects in precision weldments with complex structure |
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| Shi Duanhu,Gang Tie,Yuan Yuan,Yang Shuangyang.Image segmentation of small defects in precision weldments with complex structure[J].China Welding,2007,16(1):52-56. |
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| Authors: | Shi Duanhu Gang Tie Yuan Yuan Yang Shuangyang |
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| Abstract: | In this paper, the X-ray nondestructive test method of small defects in precision weldments with complex structure was presented. To resolve the difficulty of defect segmentation in variable grey image, the image processing based on Visual Basic programming method was adopted. The methods of automatic contrast and partial grey stretch were used to enhance the X-ray detection image which has relatively low contrast, then automatic threshold method was carried out to segment the two high intensity zones, and weld zones which contain the small defects was extracted. Smoothing and sharpen processing were proceeded on the extracted weld zones, and small defects in X-ray detection image of weldments with complex structure were segmented by using the method of background subtraction in the end. The effects of raster were eliminated, and because of that the image processing was only proceeded on the extracted weld zones, the calculated speed using the above provided algorithm was improved. |
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| Keywords: | X-ray testing complex structure Visual Basic program small defects image segmentation |
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