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《Journal of Dalian University of Technology》 2002-01
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Errors and accuracy analyses of digital image processing technique for measuring specimen deformation in triaxial test

WANG Zhu pin 1, SHAO Long tan 2, LIU Yong lu 3, HAN Guo cheng 1 ( 1.Dept. of Civil Eng., Dalian Univ. of Technol., Dalian 116024, China; 2. Dept. of Eng. Mech., Dalian Univ. of Technol., Dalian 116024, China; 3. Dept. of Phys., Dal  
Digital image processing technique for measuring the specimen deformation in triaxial test is a simple and convenient method. It has high accuracy and can get over many shortages encountered in traditional triaxial test. All types of error sources and their influences existing in the presented technique are discussed in detail, and the means to reduce or get rid of the errors are suggested. By comparing the measurement results of diameters of copper column with the "truth values", it is shown that the accuracy of the digital image processing is 10 -4 , which is higher than that of the traditional method. Digital image processing technique can meet the high accuracy measurement of soil specimen deformation.
【Fund】: 教育部高等学校骨干教师资助计划资助项目 [教技司 ( 2 0 0 0 ) 6 5号 ]
【CateGory Index】: TU411
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