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Abstract:
The merits and demerits of existing reference filtering methods for evaluation of the three-dimensional engineering surface roughness were discussed. It points out that the Dual-tree Complex Wavelet Transform (DT-CWT) is suitable for the three-dimensional surface reference filter because of its advantages of approximate translation invariance and improved directional selectivity. However, its filtering is too idealistic, which will cause an opposition at the point of distortion of the filtered reference. Therefore, this paper brings the airspace bilateral filtering into the DT-CWT transform to enhance its robustness at the point of distortion of the filtered reference. The low-frequency reference signal was obtained through reconstruction and each reconstructed coefficient was bilaterally filtered, then, the robustness of reference filtering was enhanced by the DT-CWT filtering. The simulation data show that the robustness filtering under the conditions of abnormal interference is enhanced by the improved DT-CWT, the precision error is 0.1832×10-10 m and the reconstruction error is 0.0161×10-10 m, which is much lower than that of the traditional methods. The processing results for practical measurement data indicate that the improved method well overcomes the edge effects and suppresses the effects of deep valley in the surface on the filtering results. It provides a new way for evaluation of engineering surface roughness.
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Optics and Precision Engineering
ISSN: 1004-924X
CN: 22-1198/TH
Year: 2014
Issue: 7
Volume: 22
Page: 1820-1827
Cited Count:
SCOPUS Cited Count: 8
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2
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