| 形面测量误差频域阈值处理方法 |
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| 引用本文： | 吕东方,张立富,刘奇晗.形面测量误差频域阈值处理方法[J].黑龙江水专学报,2011,2(4):113-117. |
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| 作者姓名： | 吕东方 张立富 刘奇晗 |
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| 作者单位： | 1. 黑龙江大学机电工程学院,哈尔滨,150080
2. 哈尔滨工业大学媒体技术与艺术系,哈尔滨,150001 |
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| 基金项目： | 黑龙江省教育厅科学技术研究项目（11551331） |
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| 摘 要： | 采用基于小波变换的频域方法对轮廓测量数据中的误差进行处理.阐述了小波阈值方法处理数据误差的基本原理,选取不同的阈值分别对测量数据中的粗大误差点和随机误差点进行处理.通过分析形面测量数据小波高频分解系数的特征,应用30准则对数据点中的粗大误差数据进行剔除,而后采用基于D.L Donoho阈值方法的层进阈值函数对测量数据中的随机误差点来进行处理.通过系统的比对具有代表性的小波函数阈值误差处理效果,结果表明采用的阈值去噪方法优于传统的阈值方法.
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| 关 键 词： | 误差处理 小波变换 阈值方法 |
Frequency domain threshold method for profile measurement error processing |
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| LU Dong-fang
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ZHANG Li-fu
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LIU Qi-han.Frequency domain threshold method for profile measurement error processing[J].Journal of Heilongjiang Hydraulic Engineering College,2011,2(4):113-117. |
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| Authors: | LU Dong-fang ZHANG Li-fu LIU Qi-han |
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| Affiliation: | 1. School of Mechanical and Electrical Engineering, Heilongjiang University, Harbin 150080, China; 2. Department of Media Technology and Art, Harbin Institute of Technology, Harbin 150001, China) |
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| Abstract: | The wavelet threshold de-noising algorithm is applied to process errors in the profile measurement data. The error processing priciple based on the wavelet tranform is represented in the paper, and the different threshold methods are selected for the gross errors and the random errors. According to the data character in the high frequency coefficients of the wave-let transform, the 3σ criterion is used for the gross errors deletion and the layer function based on D. L. Donoho is applied to reduce the random errors. The processing errors based on the canonical wave-let functions were systematically compared and it was concluded that the method in the paper could effectively decrease the profile measurement error. |
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| Keywords: | error processing wavelet transform threshold method |
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