Dr. Kemao Qian Profile

Dr. Kemao Qian

Associate Professor at Nanyang Technological Univ

SPIE Involvement:

Conference Chair | Conference Program Committee | Author | Editor

Publications (38)

Proceedings Article | 18 June 2024 Presentation

Optimizing fringe projection profilometry through theoretical analysis

Qian Kemao

Proceedings Volume 12997, 1299704 (2024) https://doi.org/10.1117/12.3024174

KEYWORDS: Fringe analysis

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Proceedings Article | 15 February 2024 Paper

Transformer-based smart inspection for agricultural products via x-ray images

Chaoyu Dong, Alvin Wei Wen Tan, Tong Liu, Fang Cheng, Kemao Qian

Proceedings Volume 13069, 1306919 (2024) https://doi.org/10.1117/12.3023396

KEYWORDS: Agriculture, Inspection, X-rays, X-ray imaging, X-ray sources, Neural networks, Sensors, Education and training, Transformers, X-ray detectors

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SPIE Journal Paper | 3 August 2022 Open Access

Deep learning spatial phase unwrapping: a comparative review

Kaiqiang Wang, Qian Kemao, Jianglei Di, Jianlin Zhao

APN, Vol. 1, Issue 01, 014001, (August 2022) https://doi.org/10.1117/12.10.1117/1.APN.1.1.014001

KEYWORDS: Neural networks, Signal to noise ratio, Photonics, Superposition, Denoising, Zernike polynomials, Matrices, Computer simulations, Interferometric synthetic aperture radar, Magnetic resonance imaging

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SPIE Journal Paper | 22 October 2018

Sampling moiré as a special windowed Fourier ridges algorithm in demodulation of carrier fringe patterns

Qian Kemao, Nimisha Agarwal, Shien Ri, Qinghua Wang

OE, Vol. 57, Issue 10, 100503, (October 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.10.100503

KEYWORDS: Fringe analysis, Demodulation, Detection and tracking algorithms, Algorithms, Fourier transforms, Picosecond phenomena, Phase shifts, Error analysis, Optical engineering, Algorithm development

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SPIE Journal Paper | 24 August 2017

Windowed Fourier ridges as a spatial carrier phase-shifting algorithm

Nimisha Agarwal, Qian Kemao

OE, Vol. 56, Issue 08, 080501, (August 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.8.080501

KEYWORDS: Phase shifts, Fringe analysis, Error analysis, Fourier transforms, Algorithm development, Optical engineering, Computer science, Computer engineering, Phase retrieval, Denoising

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Proceedings Article | 26 June 2017 Paper

Phase retrieval for high-speed 3D measurement using binary patterns with projector defocusing

Dongliang Zheng, Qian Kemao, Feipeng Da, Hock Soon Seah

Proceedings Volume 10329, 103290V (2017) https://doi.org/10.1117/12.2270064

KEYWORDS: Phase retrieval, Fluctuations and noise, Gaussian filters, Projection systems, Phase shifts, 3D metrology, Phase measurement

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Proceedings Article | 13 June 2017 Paper

Comparison between ternary and binary Gray-code-based phase unwrapping methods

Dongliang Zheng, Qian Kemao, Feipeng Da, Hock Soon Seah

Proceedings Volume 10449, 104491V (2017) https://doi.org/10.1117/12.2270773

KEYWORDS: 3D metrology, Phase shifts, Projection systems, Fringe analysis, Phase measurement, 3D scanning

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Proceedings Article | 13 June 2017 Paper

A review of sensing technologies for small and large-scale touch panels

Humza Akhtar, Qian Kemao, Ramakrishna Kakarala

Proceedings Volume 10449, 1044918 (2017) https://doi.org/10.1117/12.2270631

KEYWORDS: Reconstruction algorithms, Image processing, Sensors, Matrices, Binary data, Image sensors, Signal processing

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Proceedings Article | 10 February 2017 Paper

Application of EMD in fringe analysis: new developments

Chenxing Wang, Qian Kemao, Feipeng Da, Shaoyan Gai

Proceedings Volume 10250, 1025019 (2017) https://doi.org/10.1117/12.2266700

KEYWORDS: Fringe analysis

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Proceedings Article | 17 July 2015 Paper

WFF-BM3D: a hybrid denoising scheme for fringe patterns

Ming Zhao, Kemao Qian

Proceedings Volume 9524, 952423 (2015) https://doi.org/10.1117/12.2189620

KEYWORDS: Fringe analysis, Denoising, Image denoising, Image filtering, Optical interferometry, Optical filters, 3D metrology, 3D image processing, Digital filtering, Fourier transforms

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Proceedings Article | 4 March 2015 Paper

A comparison study of denoising techniques in fringe pattern analysis

Ming Zhao, Kemao Qian

Proceedings Volume 9302, 930208 (2015) https://doi.org/10.1117/12.2084795

KEYWORDS: Fringe analysis, Denoising, Image filtering, Image processing, Filtering (signal processing), 3D image processing, Optical interferometry, Precision measurement, Optical filters, Digital filtering

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Proceedings Article | 4 March 2015 Paper

iFringe: a fringe analysis application for mobile smart devices

Jacob Chan, Josias Teo, Kemao Qian

Proceedings Volume 9302, 93022B (2015) https://doi.org/10.1117/12.2084787

KEYWORDS: Image processing, Fringe analysis, Mobile devices, Fourier transforms, Phase shifts, Image filtering, Human-machine interfaces, Image analysis, Cameras, Optical signal processing

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Proceedings Article | 18 August 2014 Paper

Links between fringe pattern analysis and digital image correlation: windowed, optimal, and tracking (WOT)

Kemao Qian

Proceedings Volume 9203, 92030M (2014) https://doi.org/10.1117/12.2059757

KEYWORDS: Digital image correlation, Staring arrays, Fringe analysis, Data modeling, Data analysis, Detection and tracking algorithms, Fourier transforms, Phase shifts, Image processing, Speckle pattern

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SPIE Press Book | 2 August 2013

Windowed Fringe Pattern Analysis

Qian Kemao

KEYWORDS: Fringe analysis, Fourier transforms, Demodulation, Phase shifts, Error analysis, Speckle, Laser optics, Denoising, Optical filters, Interferometry

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Proceedings Article | 22 June 2013 Paper

Window size selection of windowed fourier ridges for phase discontinuity in quality-guided phase unwrapping

Ming Zhao, Qian Kemao

Proceedings Volume 8769, 87691P (2013) https://doi.org/10.1117/12.2021041

KEYWORDS: Fringe analysis, Computer engineering, Interferometric synthetic aperture radar, Interferometry, Tolerancing, Fourier transforms, Precision optics, Nanotechnology, Current controlled current source, Optical filters

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SPIE Journal Paper | 4 May 2012 Open Access

Toward real-time virtual biopsy of oral lesions using confocal laser endomicroscopy interfaced with embedded computing

Patricia Thong, Malini Olivo, Ramaswamy Bhuvaneswari, Stephanus Tandjung, Muhammad Movania, Wei-Ming Chiew, Hock-Soon Seah, Feng Lin, Kemao Qian, Khee-Chee Soo

JBO, Vol. 17, Issue 5, 056009, (May 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.5.056009

KEYWORDS: Confocal microscopy, Biopsy, Luminescence, 3D image processing, Tongue, 3D acquisition, Sodium, Volume rendering, Computing systems, Field programmable gate arrays

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Proceedings Article | 9 June 2011 Paper

Toward three-dimensional virtual biopsy of oral lesions through the development of a confocal endomicroscope interfaced with embedded computing

Patricia S. Thong, Malini Olivo, Muhammad Movania, Stephanus Tandjung, Ramaswamy Bhuvaneswari, Hock-Soon Seah, Feng Lin, Kemao Qian, Khee-Chee Soo

Proceedings Volume 8086, 80860W (2011) https://doi.org/10.1117/12.889655

KEYWORDS: Confocal microscopy, Biopsy, 3D image processing, Luminescence, Imaging systems, Volume rendering, Sodium, Visualization, Field programmable gate arrays, Endomicroscopy

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Proceedings Article | 17 November 2010 Paper

Comparison of two-dimensional phase retrieval methods from single interference fringe pattern

Huang Lei, Kemao Qian, Anand Asundi

Proceedings Volume 7851, 785107 (2010) https://doi.org/10.1117/12.875071

KEYWORDS: Fringe analysis, Fourier transforms, Phase retrieval, Speckle, Wavelet transforms, Reflectivity, Transform theory, Aerospace engineering, Phase measurement, 3D metrology

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Proceedings Article | 25 August 2009 Paper

Links between regularized phase tracking/windowed Fourier ridges for fringe pattern analysis and digital image correlation

Kemao Qian, Bing Pan, Feng Lin, Hock Soon Seah, Anand Asundi

Proceedings Volume 7375, 737527 (2009) https://doi.org/10.1117/12.839207

KEYWORDS: Digital image correlation, Fringe analysis, Optimization (mathematics), Image processing, Data processing, Error analysis, Aerospace engineering, Detection and tracking algorithms, Interferometry, Speckle

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Proceedings Article | 13 July 2009 Paper

Detection and diagnosis of human oral cancer using hypericin fluorescence endoscopic imaging interfaced with embedded computing

Patricia S. Thong, Malini Olivo, Feng Lin, Hock-Soon Seah, Stephanus Tandjung, Kemao Qian, William W. Chin, Ramaswamy Bhuvaneswari, Kent Mancer, Khee-Chee Soo

Proceedings Volume 7380, 73806U (2009) https://doi.org/10.1117/12.824014

KEYWORDS: Luminescence, Imaging systems, Endoscopy, Cancer, Computing systems, Confocal microscopy, Tissues, 3D visualizations, Embedded systems, Tumors

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Proceedings Article | 3 October 2008 Paper

General structure for real-time fringe pattern preprocessing and implementation of median filter and average filter on FPGA

Wenjing Gao, Kemao Qian, Haixia Wang, Feng Lin, Hock Soon Seah, Lee Sing Cheong

Proceedings Volume 7155, 71550Q (2008) https://doi.org/10.1117/12.814525

KEYWORDS: Fringe analysis, Field programmable gate arrays, Digital filtering, Fourier transforms, Image processing, Filtering (signal processing), Clocks, Algorithm development, Computing systems, LCDs

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Proceedings Article | 3 October 2008 Paper

Frequency-shifting method for phase retrieval from fringe patterns

Haixia Wang, Kemao Qian, Wenjing Gao

Proceedings Volume 7155, 71550N (2008) https://doi.org/10.1117/12.814522

KEYWORDS: Fringe analysis, Phase retrieval, Phase shifts, Detection and tracking algorithms, Demodulation, Fourier transforms, Mirrors, Computer engineering, Interferometry, Computer simulations

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Proceedings Article | 3 October 2008 Paper

Faster window Fourier transform filters for fringe pattern analysis

Le Tran Hoai Nam, Kemao Qian

Proceedings Volume 7155, 71550T (2008) https://doi.org/10.1117/12.814529

KEYWORDS: Fourier transforms, Fringe analysis, Convolution, Optical filters, Speckle, Interference (communication), Digital filtering, Interferometry, Computer engineering, Phase interferometry

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Proceedings Article | 11 August 2008 Paper

Filtering-based phase unwrapping

Kemao Qian, Wenjing Gao, Haixia Wang

Proceedings Volume 7063, 70630E (2008) https://doi.org/10.1117/12.797390

KEYWORDS: Optical filters, Electronic filtering, Interference (communication), Fourier transforms, Optical interferometry, Digital filtering, Detection and tracking algorithms, Phase measurement, Wavelet transforms, Wavelets

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SPIE Journal Paper | 1 July 2005

Two-dimensional windowed Fourier frames for noise reduction in fringe pattern analysis

Qian Kemao, Seah Hock Soon

OE, Vol. 44, Issue 07, 075601, (July 2005) https://doi.org/10.1117/12.10.1117/1.1948107

KEYWORDS: Fringe analysis, Denoising, Speckle, Optical filters, Fourier transforms, Optical engineering, Wavelets, Interference (communication), Digital filtering, Linear filtering

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Proceedings Article | 12 April 2005 Paper

Determination of phase-shift from two fringe patterns using windowed Fourier ridges

Kemao Qian, Hock Soon Seah, Anand Asundi

Proceedings Volume 5852, (2005) https://doi.org/10.1117/12.621484

KEYWORDS: Fringe analysis, Phase interferometry, Fourier transforms, Phase shifts, Convolution, Experimental mechanics, Computer engineering, Mechanical engineering, Product engineering, Interferometry

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Proceedings Article | 2 August 2004 Paper

A simple phase unwrapping approach using windowed Fourier filtering

Qian Kemao, Seah Hock Soon, Anand Asundi

Proceedings Volume 5531, (2004) https://doi.org/10.1117/12.557603

KEYWORDS: Fourier transforms, Image filtering, Convolution, Optical filters, Optical interferometry, Algorithm development, Computer engineering, Mechanical engineering, Product engineering, Fringe analysis

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SPIE Journal Paper | 1 July 2004

Windowed Fourier transform method for demodulation of carrier fringes

Qian Kemao

OE, Vol. 43, Issue 07, (July 2004) https://doi.org/10.1117/12.10.1117/1.1759333

KEYWORDS: Fourier transforms, Demodulation, Fringe analysis, Optical metrology, Interference (communication), Electronic filtering, Computer engineering, Control systems, Convolution, Optical filters

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SPIE Journal Paper | 1 October 2003

Filtering the complex field in phase shifting interferometry

Kemao Qian, Hock Soon Seah, Anand Asundi

OE, Vol. 42, Issue 10, (October 2003) https://doi.org/10.1117/12.10.1117/1.1609457

KEYWORDS: Fourier transforms, Fringe analysis, Phase interferometry, Phase shifts, Phase retrieval, Optical filters, Speckle, Interference (communication), Computer engineering, Mechanical engineering

SPIE Journal Paper | 1 September 2003

Noise suppression in spatial carrier phase shifting method

Kemao Qian, Seah Hock Soon, Anand Asundi

OE, Vol. 42, Issue 09, (September 2003) https://doi.org/10.1117/12.10.1117/1.1592169

KEYWORDS: Bandpass filters, Phase shifting, Fringe analysis, Linear filtering, Fourier transforms, Computer simulations, Optical filters, Convolution, Computer engineering, Mechanical engineering

SPIE Journal Paper | 1 June 2003

Algorithm for directly retrieving the phase difference: a generalization

Kemao Qian, Anand Asundi

OE, Vol. 42, Issue 06, (June 2003) https://doi.org/10.1117/12.10.1117/1.1573640

KEYWORDS: Phase measurement, Phase shifting, Fringe analysis, Fourier transforms, Phase shifts, Speckle, Interferometry, LCDs, Interferometers, Sensors

Proceedings Article | 29 April 2003 Paper

Evaluation of binary speckle correlation

Kemao Qian, Hock Soon Seah, Asundi Anand

Proceedings Volume 5058, (2003) https://doi.org/10.1117/12.509764

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Proceedings Article | 29 May 2002 Paper

Weighted phase unwrapping utilizing intensity modulation analysis for phase-shifting profilometry

Zhenyu Jiang, Kemao Qian, Hong Miao, Xiaoping Wu

Proceedings Volume 4537, (2002) https://doi.org/10.1117/12.468757

KEYWORDS: Phase shift keying, Modulation, Phase shifts, Binary data, Fringe analysis, Phase measurement, Bandpass filters, Mechanics, Mechanical engineering, Shape analysis

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Proceedings Article | 29 May 2002 Paper

Advanced image processing method applied to speckle fringe pattern based on wavelet transform

Hong Miao, Zhenyu Jiang, Kemao Qian, Xiaoping Wu

Proceedings Volume 4537, (2002) https://doi.org/10.1117/12.468868

KEYWORDS: Speckle, Wavelet transforms, Fringe analysis, Image processing, Image filtering, Linear filtering, Computer simulations, Distortion, Crystals, Nonlinear filtering

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Proceedings Article | 30 October 2001 Paper

Comparison of some phase-shifting algorithms with a phase step of pi/2

Kemao Qian

Proceedings Volume 4596, (2001) https://doi.org/10.1117/12.447358

KEYWORDS: Algorithm development, Error analysis, Phase shifts, Detection and tracking algorithms, Phase shifting, Algorithms, Computer simulations, Sensors, Phase interferometry, Phase shift keying

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Proceedings Article | 30 October 2001 Paper

Fourier transform method for phase retrieving from fringe patterns without carrier: beware its theoretical error

Kemao Qian, Jun Wang

Proceedings Volume 4596, (2001) https://doi.org/10.1117/12.447357

KEYWORDS: Fourier transforms, Fringe analysis, Error analysis, Optical metrology, Phase shifting, Spatial frequencies, Bandpass filters, Image filtering, Photodetectors, Sensors

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Proceedings Article | 30 October 2001 Paper

Fourier transform method for phase retrieving from fringe patterns with carrier: window selection

Kemao Qian, Xiaoping Wu, Anand Asundi

Proceedings Volume 4596, (2001) https://doi.org/10.1117/12.447366

KEYWORDS: Fringe analysis, Fourier transforms, Computer simulations, Sensors, Optical filters, Mechanics, Optical metrology, Photodetectors, Image filtering

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Proceedings Article | 7 May 1999 Paper

Novel image processing method applied to speckle fringe pattern based on the wavelet transform

Hong Miao, Kemao Qian, Xiaoping Wu

Proceedings Volume 3740, (1999) https://doi.org/10.1117/12.347762

KEYWORDS: Speckle, Fringe analysis, Wavelet transforms, Image filtering, Image processing, Digital filtering, Wavelets, Speckle pattern, Computer simulations, Binary data

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Showing 5 of 38 publications

Proceedings Volume Editor (13)

SPIE Conference Volume | 2 May 2024

International Workshop on Advanced Imaging Technology (IWAIT) 2024

SPIE Conference Volume | 15 February 2024

International Conference on Optical and Photonic Engineering (icOPEN 2023)

SPIE Conference Volume | 7 September 2023

Multimodal Sensing and Artificial Intelligence: Technologies and Applications III

SPIE Conference Volume | 25 March 2023

International Workshop on Advanced Imaging Technology (IWAIT) 2023

SPIE Conference Volume | 27 January 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

Showing 5 of 13 publications

Conference Committee Involvement (42)

Multimodal Sensing and Artificial Intelligence for Sustainable Future

23 June 2025 | Munich, Germany

Optical Technology and Measurement for Industrial Applications Conference

21 April 2025 | Yokohama, Japan

International Workshop on Advanced Imaging Technology (IWAIT) 2025

6 January 2025 | Douliu City, Taiwan

Optical Metrology and Inspection for Industrial Applications XI

12 October 2024 | Nantong, Jiangsu, China

Dimensional Optical Metrology and Inspection for Practical Applications XIII

24 April 2024 | National Harbor, Maryland, United States

Optical Technology and Measurement for Industrial Applications Conference

22 April 2024 | Yokohama, Japan

International Workshop on Advanced Imaging Technology (IWAIT) 2024

7 January 2024 | Langkawi, Malaysia

International Conference on Optical and Photonic Engineering (icOPEN 2023)

27 November 2023 | Singapore, Singapore

Optical Metrology and Inspection for Industrial Applications X

15 October 2023 | Beijing, China

Multimodal Sensing and Artificial Intelligence: Technologies and Applications III

27 June 2023 | Munich, Germany

Dimensional Optical Metrology and Inspection for Practical Applications XII

2 May 2023 | Orlando, Florida, United States

Optical Technology and Measurement for Industrial Applications Conference

17 April 2023 | Yokohama, Japan

International Workshop on Advanced Imaging Technology (IWAIT) 2023

9 January 2023 | Jeju, Korea, Republic of

Optical Metrology and Inspection for Industrial Applications IX

5 December 2022 | Online Only, China

International Conference on Optical and Photonic Engineering (icOPEN 2022)

24 November 2022 | ONLINE, China

Interferometry XXI

24 August 2022 | San Diego, California, United States

Optical Technology and Measurement for Industrial Applications Conference 2022

18 April 2022 | Yokohama, Japan

Dimensional Optical Metrology and Inspection for Practical Applications XI

5 April 2022 | Orlando, Florida, United States

International Workshop on Advanced Imaging Technology (IWAIT 2022)

4 January 2022 | Hong Kong, China

Optical Metrology and Inspection for Industrial Applications VIII

11 October 2021 | Nantong, JS, China

Optical Technology and Measurement for Industrial Applications Conference

20 April 2021 | Online, Japan

Dimensional Optical Metrology and Inspection for Practical Applications X

12 April 2021 | Online Only, Florida, United States

International Workshop on Advanced Image Technology 2021

5 January 2021 | Online Only, Japan

Optical Metrology and Inspection for Industrial Applications VII

12 October 2020 | Online Only, China

Interferometry XX

24 August 2020 | Online Only, California, United States

Dimensional Optical Metrology and Inspection for Practical Applications IX

27 April 2020 | Online Only, California, United States

Optical Technology and Measurement for Industrial Applications Conference

22 April 2020 | Yokohama, Japan

Optical Metrology and Inspection for Industrial Applications VI

21 October 2019 | Hangzhou, China

Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019)

16 July 2019 | Phuket, Thailand

Optical Technology and Measurement for Industrial Applications Conference

23 April 2019 | Yokohama, Japan

Dimensional Optical Metrology and Inspection for Practical Applications VIII

16 April 2019 | Baltimore, MD, United States

International Workshop on Advanced Image Technology

6 January 2019 | Singapore, Singapore

Optical Metrology and Inspection for Industrial Applications V

11 October 2018 | Beijing, China

Interferometry XIX

21 August 2018 | San Diego, California, United States

Sixth International Conference on Optical and Photonic Engineering

8 May 2018 | Shanghai, China

Fifth International Conference on Optical and Photonics Engineering

4 April 2017 | Singapore, Singapore

Optical Metrology and Inspection for Industrial Applications IV

12 October 2016 | Beijing, China

International Conference on Experimental Mechanics 2014

15 November 2014 | Singapore, Singapore

Optical Metrology and Inspection for Industrial Applications III

9 October 2014 | Beijing, China

International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013)

9 April 2013 | Singapore, Singapore

Optical Metrology and Inspection for Industrial Applications II

5 November 2012 | Beijing, China

Fourth International Conference on Experimental Mechanics

18 November 2009 | Singapore, Singapore

Showing 5 of 42 Conference Committees

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