Qian Kemao

Summary

Affiliation: Nanyang Technological University
Country: Singapore

Publications

  1. doi request reprint Windowed Fourier filtered and quality guided phase unwrapping algorithm: on locally high-order polynomial phase
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore, 639798
    Appl Opt 49:1075-9. 2010
  2. ncbi request reprint Phase-shifting windowed Fourier ridges for determination of phase derivatives
    Kemao Qian
    School of Computer Engineering, Nanyang Technological University, Singapore 639798
    Opt Lett 28:1657-9. 2003
  3. ncbi request reprint Windowed Fourier-filtered and quality-guided phase-unwrapping algorithm
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Appl Opt 47:5420-8. 2008
  4. ncbi request reprint Windowed Fourier transform for fringe pattern analysis: theoretical analyses
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Appl Opt 47:5408-19. 2008
  5. ncbi request reprint Sequential demodulation of a single fringe pattern guided by local frequencies
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Opt Lett 32:127-9. 2007
  6. ncbi request reprint Generalized three-dimensional windowed Fourier transform for fringe analysis
    Kemao Qian
    School of Computer Engineering, Nanyang Technological University, Singapore
    Opt Lett 31:2121-3. 2006
  7. ncbi request reprint Windowed Fourier transform for fringe pattern analysis: addendum
    Qian Kemao
    Center for Graphics and Imaging Technology, School of Computer Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
    Appl Opt 43:3472-3. 2004
  8. ncbi request reprint Windowed Fourier transform for fringe pattern analysis
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore 639798
    Appl Opt 43:2695-702. 2004
  9. ncbi request reprint Instantaneous frequency and its application to strain extraction in moire interferometry
    Qian Kemao
    Nanyang Technological University, Singapore 639798
    Appl Opt 42:6504-13. 2003
  10. ncbi request reprint Comparative analysis on some filters for wrapped phase maps
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Appl Opt 46:7412-8. 2007

Collaborators

Detail Information

Publications17

  1. doi request reprint Windowed Fourier filtered and quality guided phase unwrapping algorithm: on locally high-order polynomial phase
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore, 639798
    Appl Opt 49:1075-9. 2010
    ..The polynomial order of 4 is suggested for the CO-LSF, as higher order polynomials do not give significant improvement to the WFF-QG. One disadvantage of the CO-LSF is that it is more sensitive to phase discontinuities than the WFF-QG...
  2. ncbi request reprint Phase-shifting windowed Fourier ridges for determination of phase derivatives
    Kemao Qian
    School of Computer Engineering, Nanyang Technological University, Singapore 639798
    Opt Lett 28:1657-9. 2003
    ..Phase derivatives with the proper sign can be directly retrieved even in the presence of noise. An application for curvature determination from speckle shearographic fringes demonstrates the effectiveness of the method...
  3. ncbi request reprint Windowed Fourier-filtered and quality-guided phase-unwrapping algorithm
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Appl Opt 47:5420-8. 2008
    ..The windowed Fourier ridges algorithm, another algorithm based on windowed Fourier transform, is also tested and found to be useful in building barriers along phase discontinuities...
  4. ncbi request reprint Windowed Fourier transform for fringe pattern analysis: theoretical analyses
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Appl Opt 47:5408-19. 2008
    ..Algorithms applied to different fringe patterns, different noise models, and different dimensions are discussed. The theoretical analyses are verified by numerical simulations...
  5. ncbi request reprint Sequential demodulation of a single fringe pattern guided by local frequencies
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Opt Lett 32:127-9. 2007
    ..The proposed approach is verified by successful demodulation of a simulated fringe pattern and two experimental fringe patterns...
  6. ncbi request reprint Generalized three-dimensional windowed Fourier transform for fringe analysis
    Kemao Qian
    School of Computer Engineering, Nanyang Technological University, Singapore
    Opt Lett 31:2121-3. 2006
    ..The principles of windowed Fourier filtering and windowed Fourier ridges are developed. Experimental verification shows encouraging results despite a longer processing time...
  7. ncbi request reprint Windowed Fourier transform for fringe pattern analysis: addendum
    Qian Kemao
    Center for Graphics and Imaging Technology, School of Computer Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
    Appl Opt 43:3472-3. 2004
    ..I show that the same methods can be applied to process a single closed-fringe pattern in either noise reduction or phase approximation, which adds to the versatility of the windowed Fourier-transform method for fringe pattern analysis...
  8. ncbi request reprint Windowed Fourier transform for fringe pattern analysis
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore 639798
    Appl Opt 43:2695-702. 2004
    ..I focus on the extraction of phase and phase derivatives from either phase-shifted fringe patterns or a single carrier fringe pattern. Principles as well as examples are given to show the effectiveness of the proposed methods...
  9. ncbi request reprint Instantaneous frequency and its application to strain extraction in moire interferometry
    Qian Kemao
    Nanyang Technological University, Singapore 639798
    Appl Opt 42:6504-13. 2003
    ..The properties of the two methods as well as their applications to a real fringe pattern are given. The effectiveness of the proposed methods is illustrated by their comparison with traditional methods...
  10. ncbi request reprint Comparative analysis on some filters for wrapped phase maps
    Qian Kemao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Appl Opt 46:7412-8. 2007
    ..The analysis shows that principles of the RPT, MPLS, WFR, and ACF are equivalent and the SCAF also leads to the WFR by some extension, which elegantly unifies all these methods for filtering unwrapped phase maps...
  11. doi request reprint Real-time 2D parallel windowed Fourier transform for fringe pattern analysis using Graphics Processing Unit
    Wenjing Gao
    School of Computer Engineering, Nanyang Technological University, Singapore
    Opt Express 17:23147-52. 2009
    ..Up to 132x speedup is obtained for WFT-based algorithms using NVIDIA GTX295 graphics card than sequential C in quad-core 2.5GHz Intel(R)Xeon(R) CPU E5420...
  12. ncbi request reprint Fringe pattern denoising using coherence-enhancing diffusion
    Haixia Wang
    School of Computer Engineering, Nanyang Technological University, Singapore, 639798
    Opt Lett 34:1141-3. 2009
    ..Theoretical analysis as well as simulation and experimental verifications are addressed...
  13. ncbi request reprint Frequency guided methods for demodulation of a single fringe pattern
    Haixia Wang
    School of Computer Engineering, Nanyang Technological University, Singapore
    Opt Express 17:15118-27. 2009
    ..Demodulation results from one computer-simulated and two experimental fringe patterns using the proposed methods will be demonstrated...
  14. ncbi request reprint Phase error analysis and compensation for nonsinusoidal waveforms in phase-shifting digital fringe projection profilometry
    Bing Pan
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798, Singapore
    Opt Lett 34:416-8. 2009
    ..Experiments show that the proposed algorithm can be used for effective phase error compensation in practical phase-shifting FPP...
  15. doi request reprint Statistical analysis for windowed Fourier ridge algorithm in fringe pattern analysis
    Wenjing Gao
    School of Computer Engineering, Nanyang Technological University, Singapore, 639798
    Appl Opt 51:328-37. 2012
    ..The above theoretical analysis and comparison are verified by Monte Carlo simulations. Furthermore, the WFR algorithm is shown to be slightly better than the WFF algorithm for quadratic phase...
  16. ncbi request reprint Quality-guided orientation unwrapping for fringe direction estimation
    Haixia Wang
    School of Computer Engineering, Nanyang Technological University, Singapore
    Appl Opt 51:413-21. 2012
    ..The direction qualities are compared for both simulated and experimental fringe patterns. Their application to demodulation technique is also given...
  17. doi request reprint Comparative analysis on some spatial-domain filters for fringe pattern denoising
    Haixia Wang
    School of Computer Engineering, Nanyang Technological University, Singapore, 639798
    Appl Opt 50:1687-96. 2011
    ..Theoretical analysis shows that the four filters are largely equivalent to each other. Quantitative results are given on simulated fringe patterns to validate the theoretical analysis and to compare the performance of these filters...