Feature extraction of asymmetric surface topography based on redundancy lifting morphological wavelet

XV Rui-fen
（The School of Mechanical Electronic and Information Engineer， Lishui Vocational & Technical College，
Lishui 323000， China）

Abstract： Aiming at the shift variation and poor directional selectivity of the feature extraction of the asymmetric surface topography by the lifting wavelet，the redundancy lifting morphological wavelet which is with shift invariance and good directional selectivity was applied to the extracion.Then the feature extraction of the asymmetric cylinder sleeve of plateau honing surface by the morphological wavelet was analyzed，and the simulation was established to predict the effects of the feature extraction of a simulated space surface with the characteristics of a certain length of trench by the morphological wavelet. The results indicate that，when the redundancy lifting morphological wavelet is carried out to extract the feature of the asymmetric surface topography，the reconstructed signal along characteristic edge is without variation and distortion nearly，and the furture is extracted accurately.
Key words： asymmetric surface topography；redundancy lifting morphological wavelet；feature extraction