| Image processing of ESPI based on measurement the welding dynamic displacement fields |
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| 作者姓名： | 陶军 李冬青 范成磊 刘忠国 |
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| 作者单位： | StateKeyLaboratoryofAdvancedWeldingProductionTechnology,HarbinInstituteofTechnology,Harbin,150001 |
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| 基金项目： | ThisworkissupportedbyDoctorFoundationofEducationDepartment(No.98021336). |
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| 摘 要： | A dual-beam electronic speckle pattern inteorerometry (ESPI) system was adopted to get speckle patterns for the measurement of welding dynamic displacement fields. The mathematical model of this system was described, based on which methods of the ESPI pattern image processing were discussed. Gray transformation and histogram equalization were used to enhance the contrast of speckle patterns. A discrete cosine image processing method was carried out and an exponent low-pass filter was chosen to reduce multiplicative noise in speckle patterns. Speckle grain noise can be eliminated effectively after these processes.
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| 关 键 词： | 焊接 电子光斑干涉测量 图形处理 离散余弦指数滤波器 |
Image processing of ESPI based on measurement the welding dynamic displacement fields |
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| Tao Jun,Li Dongqing,Fan Chenglei and Liu Zhongguo,State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin,..Image processing of ESPI based on measurement the welding dynamic displacement fields[J].China Welding,2004,13(2):111-114. |
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| Authors: | Tao Jun Li Dongqing Fan Chenglei and Liu Zhongguo State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin |
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| Affiliation: | State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin,150001 |
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| Abstract: | A dual-beam electronic speckle pattern interferometry (ESPI) system was adopted to get speckle patterns for the measurement of welding dynamic displacement fields. The mathematical model of this system was described, based on which methods of the ESPI pattern image processing were discussed. Gray transformation and histogram equalization were used to enhance the contrast of speckle patterns. A discrete cosine image processing method was carried out and an exponent low-pass filter was chosen to reduce multiplicative noise in speckle patterns. Speckle grain noise can be eliminated effectively after these processes. |
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| Keywords: | welding electronic speckle pattern interferometry image processing discrete cosine low-pass exponent filter |
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