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论文类型：期刊论文

发表时间：2012-05-01

发表刊物：Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering

收录刊物：EI、PKU、ISTIC、Scopus

卷号：31

期号：SUPPL.1

页面范围：2881-2887

ISSN号：10006915

摘要：Possible sources of both system errors and random errors for digital image processing system have been discussed. Calibrations have been made to get ride of system errors such as lens distortion. As for random errors, necessary improvements for experimental environment and data processing have been made. After all these measures taken, other error sources remained are not quantified separately, instead, accuracy of the entire system is examined. Capability of using this system for strain measurement in triaxial tests is illustrated throught comparisons of strain results obtained from both this system and conventional measurement techniques. Finally, the accuracy of this system is quantified through comparison of strain results obtained by both image processing technique and a static strain tester, and the statistical accuracy value is given out to be 4  10 -5.