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| An Improved Method for NURBS Quadric Surface Based on Discrete Stationary Wavelet Transform |
| TIAN Xiao-qiang1,KONG Ling-fu1,KONG De-ming2,3,CUI Yong-qiang1 |
1. Institute of Information Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
2. Institute of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
3. Department of Telecommunications and Information Processing, Ghent University, Ghent B-9000, Belgium |
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Abstract In order to improve fitting accuracy of quadric surface,an improved method for the currently recognized NURBS quadric surface method based on discrete stationary wavelet transform was proposed. At first, elevation image of the quadric surface point cloud and elevation sequence were obtained by using the grid method. Then feature points of the quadric surface were extracted from the discrete stationary wavelet transform results of the elevation sequence of the elevation image. Finally, high accuracy NURBS quadric surface was realized by using the extracted feature points. The experimental results showed that compared with NURBS method, the root mean squared errors of fitting results of sphere and cone surface were reduced 55.79% and 50.47% respectively, and it had satisfactory fitting precision.
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Received: 15 May 2019
Published: 08 June 2020
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2020, Vol. 41 
