Prof. Joewono Widjaja Profile

Prof. Joewono Widjaja

at Suranaree Univ of Technology

SPIE Involvement:

Author

Publications (33)

Proceedings Article | 5 March 2018 Paper

Study of 3D profilometry by using wavelet filter

Taweesak Chaiyakhun, Joewono Widjaja, Jaroon Wongjarern

Proc. SPIE. 10714, Third International Conference on Photonics Solutions (ICPS2017)

KEYWORDS: Optical filters, Modulation, Cameras, Wavelets, Fourier transforms, Phase shift keying, CCD cameras, Gaussian filters, 3D metrology, Projection systems

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Proceedings Article | 5 March 2018 Paper

3D object shape reconstruction using structured light illumination

Joewono Widjaja, Jaroon Wongjarern

Proc. SPIE. 10714, Third International Conference on Photonics Solutions (ICPS2017)

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SPIE Journal Paper | 19 January 2018

Improved accuracy in Wigner–Ville distribution-based sizing of rod-shaped particle using flip and replication technique

Porntip Chuamchaitrakool, Joewono Widjaja, Hiroyuki Yoshimura

OE Vol. 57 Issue 01

KEYWORDS: Holograms, Particles, Image sensors, Particle sizing, 3D image reconstruction, Optical simulations, Optical engineering, Signal analyzers, Holography, Image processing

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SPIE Journal Paper | 21 July 2017

Experimental extractions of particle position from inline holograms using single coefficient of Wigner–Ville analysis

Joewono Widjaja, Saowaros Dawprateep, Porntip Chuamchaitrakool

OE Vol. 56 Issue 07

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Proceedings Article | 11 November 2016 Paper

Pre-cataract surgery test using speckle pattern

Suganda Jutamulia, Erning Wihardjo, Joewono Widjaja

Proc. SPIE. 10150, Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016)

KEYWORDS: Eye, Cornea, Surgery, Spatial frequencies, Speckle, Opacity, Retina, Semiconductor lasers, Speckle pattern, Collimation

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Proceedings Article | 11 November 2016 Paper

Particle tracking by using single coefficient of Wigner-Ville distribution

J. Widjaja, S. Dawprateep, P. Chuamchaitrakool, P. Meemon

Proc. SPIE. 10150, Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016)

KEYWORDS: Holograms, Holography, 3D image reconstruction, Digital holography, Spatial frequencies, Particles, Computing systems, Fourier transforms, Computer simulations, Signal analyzers

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Proceedings Article | 29 July 2015 Paper

Photonic signal processing using acousto-optic effects

Joewono Widjaja

Proc. SPIE. 9659, International Conference on Photonics Solutions 2015

KEYWORDS: Mirrors, Spectrum analysis, Modulation, Image processing, Fourier transforms, Signal processing, Signal analysis, Bragg cells, Acousto-optics, Wigner distribution functions

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Proceedings Article | 29 July 2015 Paper

Properties of Wigner-Ville distribution’s coefficients in in-line particle hologram analysis

S. Dawprateep, J. Widjaja, P. Chuamchaitrakool, P. Meemon

Proc. SPIE. 9659, International Conference on Photonics Solutions 2015

KEYWORDS: Holograms, Holography, 3D image reconstruction, Digital holography, Spatial frequencies, Particles, Wavefronts, Photonics, Tissue optics, Digital recording

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Proceedings Article | 17 July 2015 Paper

Experimental demonstrations of retinal recognition using compression-based joint transform correlator

Joewono Widjaja, Komin Kaewphaluk

Proc. SPIE. 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015)

KEYWORDS: Image compression, 3D acquisition, Retina, Photonics, Quantization, Retinal scanning, Joint transforms, Target recognition, Optical correlators, Information security

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Proceedings Article | 2 June 2014 Paper

Design, implementation, and characterization of spectrometer-based spectral domain optical coherence tomography

Kunakorn Palawong, Pornthep Pongchalee, Porntip Chuamchaitrakool, Sukanya Tachatraiphop, Joewono Widjaja, Panomsak Meemon

Proc. SPIE. 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics

KEYWORDS: Point spread functions, Mirrors, Light sources, Biomedical optics, Imaging systems, Optical coherence tomography, Spectroscopy, Image resolution, Spectral resolution, Modulation transfer functions

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Proceedings Article | 2 June 2014 Paper

Fourier transform profilometry by using digital dc subtraction

J. Wongjarern, J. Widjaja, W. Sangpech, N. Thongdee, P. Santisoonthornwat, O. Traisak, P. Chuamchaitrakool, P. Meemon

Proc. SPIE. 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics

KEYWORDS: Phase modulation, Modulation, Sensors, Fourier transforms, CCD cameras, LCDs, 3D metrology, Projection systems, Ronchi rulings, Experimental mechanics

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Proceedings Article | 2 June 2014 Paper

Holographic particle size extraction by using Wigner-Ville distribution

Porntip Chuamchaitrakool, Joewono Widjaja, Hiroyuki Yoshimura

Proc. SPIE. 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics

KEYWORDS: MATLAB, Holograms, Holography, 3D image reconstruction, Digital holography, Modulation, Particles, Optical simulations, Charge-coupled devices, CCD image sensors

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Proceedings Article | 22 June 2013 Paper

Joint transform correlator using JPEG-compressed reference images

Joewono Widjaja

Proc. SPIE. 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013)

KEYWORDS: Image compression, Spatial frequencies, Speckle, Fingerprint recognition, Computer simulations, Quantization, Joint transforms, Target recognition, CCD image sensors, Optical correlators

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Proceedings Article | 7 June 2013 Paper

Retinal recognition using compression-based joint transform correlator

Ubon Suripon, Joewono Widjaja

Proc. SPIE. 8883, ICPS 2013: International Conference on Photonics Solutions

KEYWORDS: Target detection, Image compression, Retina, Computing systems, Quantization, Retinal scanning, Joint transforms, Target recognition, Optical correlators, Information security

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SPIE Journal Paper | 12 March 2013

Retinal blood vessel detection using wavelet-matched filter

Joewono Widjaja, Ubon Suripon

OE Vol. 52 Issue 03

KEYWORDS: Electronic filtering, Blood vessels, Wavelets, Gaussian filters, Image filtering, Target detection, Image segmentation, Image processing, Retina, Blood

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SPIE Journal Paper | 1 September 2011

Retina recognition using compression-based joint transform correlator

Joewono Widjaja, Ubon Suripon

OE Vol. 50 Issue 09

KEYWORDS: Retina, Image compression, Chromium, Target recognition, Retinal scanning, Joint transforms, Optical correlators, Optical engineering, 3D acquisition, Biometrics

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Proceedings Article | 17 November 2010 Paper

Holographic image encryption using random phase mask

Joewono Widjaja

Proc. SPIE. 7851, Information Optics and Optical Data Storage

KEYWORDS: Holograms, Holography, Image encryption, Mach-Zehnder interferometers, Digital holography, Computer simulations, Image quality, Convolution, CCD image sensors, Computer security

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SPIE Journal Paper | 1 July 2008

Modified joint transform correlator using smoothed amplitude-modulated filter

Pitchaya Kaewkasi, Joewono Widjaja, Jun Uozumi

OE Vol. 47 Issue 07

KEYWORDS: Joint transforms, Optical correlators, Target detection, Optical filters, Optical engineering, Target recognition, Computer simulations, Spatial frequencies, Fourier transforms, Image filtering

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Proceedings Article | 3 April 2008 Paper

Particle tracking from in-line holograms by using single wavelet coefficient

S. Soontaranon, J. Widjaja

Proc. SPIE. 6793, International Workshop and Conference on Photonics and Nanotechnology 2007

KEYWORDS: Optical fibers, Holograms, Holography, Wavelet transforms, 3D image reconstruction, Digital holography, Wavelets, Particles, Distance measurement, CCD image sensors

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SPIE Journal Paper | 1 January 2008

Effects of threshold on multiple-target detection by using a modified amplitude-modulated joint transform correlator

PItchaya Kaewkasi, Joewono Widjaja, Jun Uozumi

OE Vol. 47 Issue 01

KEYWORDS: Target detection, Optical engineering, Optical correlators, Joint transforms, Computer simulations, 3D acquisition, Spatial frequencies, Signal attenuation, Computing systems, Fourier transforms

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Proceedings Article | 12 April 2005 Paper

Holographic particle sizing by using absolute values of the wavelet transform

Joewono Widjaja, Siriwat Soontaranon, Toshimitsu Asakura

Proc. SPIE. 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics

KEYWORDS: Optical fibers, Holograms, Holography, Wavelet transforms, Digital holography, Modulation, Wavelets, Particles, Optical simulations, Particle sizing

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SPIE Journal Paper | 1 August 2004

Real-time joint transform correlator using compressed reference images

Joewono Widjaja, Ubon Suripon

OE Vol. 43 Issue 08

KEYWORDS: Image compression, Joint transforms, Optical correlators, Chromium, Optical engineering, Automatic target recognition, Computer simulations, Fingerprint recognition, Target recognition, Spatial frequencies

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SPIE Journal Paper | 1 August 2004

ANFIS-based fingerprint-matching algorithm

Hui Hong, Feijun Song, Joewono Widjaja, Jianhua Li

OE Vol. 43 Issue 08

KEYWORDS: Fuzzy logic, Fingerprint recognition, Image filtering, Fuzzy systems, Data centers, Databases, Evolutionary algorithms, Data modeling, Detection and tracking algorithms, System identification

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SPIE Journal Paper | 1 March 2003

Spectral-hologram-based correlator for photonic IP router: architectural considerations

Joewono Widjaja

OE Vol. 42 Issue 03

KEYWORDS: Optical correlators, Holography, Holograms, Second-harmonic generation, Switches, Diffraction gratings, Fourier transforms, Wavelength division multiplexing, Collimation, Signal generators

Proceedings Article | 16 September 2002 Paper

IP router by using spectral hologram as address bank

Joewono Widjaja

Proc. SPIE. 4929, Optical Information Processing Technology

KEYWORDS: Optical fibers, Holograms, Holography, Second-harmonic generation, Networks, Fourier transforms, Wavelength division multiplexing, Collimation, Optical correlators, Diffraction gratings

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Proceedings Article | 16 September 2002 Paper

Particle tracking and sizing by using wavelet analysis and reconstruction of envelope function

Siriwat Soontaranon, Joewono Widjaja, Toshimitsu Asakura

Proc. SPIE. 4929, Optical Information Processing Technology

KEYWORDS: Holograms, Holography, Wavelet transforms, Digital holography, Modulation, Wavelets, Particles, Charge-coupled devices, CCD image sensors, Spherical lenses

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Proceedings Article | 13 June 2001 Paper

Effects of image compression on digital specklegrams

Joewono Widjaja

Proc. SPIE. 4317, Second International Conference on Experimental Mechanics

KEYWORDS: Data compression, Image compression, Digital photography, Speckle, Glasses, Copper, Photography, CCD cameras, Speckle pattern, Image quality

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Proceedings Article | 19 July 1999 Paper

Particle sizing and tracking by using wavelet transform

Joewono Widjaja

Proc. SPIE. 3749, 18th Congress of the International Commission for Optics

KEYWORDS: Optical filters, Holograms, Holography, Wavelet transforms, 3D image reconstruction, Wavelets, Particles, Image filtering, Particle sizing, Automatic tracking

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Proceedings Article | 29 October 1996 Paper

Optical associative memory using wavelet transform

Joewono Widjaja, Abdul Wahab

Proc. SPIE. 2904, Intelligent Robots and Computer Vision XV: Algorithms, Techniques,Active Vision, and Materials Handling

KEYWORDS: Optical filters, Mirrors, Holography, Wavelet transforms, 3D image reconstruction, Pattern recognition, Wavelets, Electronic filtering, Content addressable memory, Neurons

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Proceedings Article | 1 September 1996 Paper

Holographic associative memory using wavelet-matched filters

Joewono Widjaja

Proc. SPIE. 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology

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Proceedings Article | 18 August 1995 Paper

Real-time wavelet-matched filtering using photorefractive four-wave mixing

Joewono Widjaja, Yasuo Tomita

Proc. SPIE. 2529, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications

KEYWORDS: Optical filters, Pattern recognition, Wavelets, Crystals, Nonlinear optics, Laser crystals, Four wave mixing, Electronic filtering, Nonlinear filtering, Optical pattern recognition

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SPIE Journal Paper | 1 May 1994

Optical implementation of artificial synapses by means of the Wigner distribution approach

Joewono Widjaja, Jun Uozumi, Toshimitsu Asakura

OE Vol. 33 Issue 05

KEYWORDS: Neurons, Diffractive optical elements, Neural networks, Wigner distribution functions, Holograms, Binary data, Detector arrays, Artificial neural networks, Optical components, Optical engineering

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Proceedings Article | 1 March 1991 Paper

Method for evaluating displacement of objects using the Wigner distribution function

Joewono Widjaja, Jun Uozumi, Toshimitsu Asakura

Proc. SPIE. 1400, Optical Fabrication and Testing

KEYWORDS: Spatial frequencies, Speckle, Glasses, Photography, Fourier transforms, Optical fabrication, Optical testing, Speckle pattern, Transmittance, Wigner distribution functions

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