Prof. Mohamad Zubir Mat Jafri Profile

Prof. Mohamad Zubir Mat Jafri

Professor at Univ Sains Malaysia

SPIE Involvement:

Author

Publications (87)

Proceedings Article | 17 May 2018 Paper

The performance and stability of titanium dioxide and ethylhexyl methoxycinnamate as sunscreen filter: a comparison study

C.H. Tan, M.Z. MatJafri, A. Omar, W. Maryam

Proceedings Volume 10685, 1068548 (2018) https://doi.org/10.1117/12.2307337

KEYWORDS: Ultraviolet radiation, Transmittance, Titanium dioxide, Skin, Spectroscopy, Ultraviolet sources, Sun, Optical filters, Skin cancer

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Proceedings Article | 14 May 2018 Paper

Graphene all-optical sensor based on nonlinear multimode interference coupler

M. A. Hassim, W. Maryam, M. Z. Mat Jafri

Proceedings Volume 10684, 1068425 (2018) https://doi.org/10.1117/12.2307341

KEYWORDS: Waveguides, Brain-machine interfaces, Graphene, Refractive index, Sensors, Nonlinear optics, Wave propagation interference, Multimode interference devices, Wave propagation

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Proceedings Article | 2 November 2017 Paper

Comparison of different discriminant functions for mangrove species analysis in Matang Mangrove Forest Reserve (MMFR), Perak based on statistical approach

Boon Chun Beh, Kok Chooi Tan, Mohd. Zubir Mat Jafri, Hwee San Lim

Proceedings Volume 10421, 104211U (2017) https://doi.org/10.1117/12.2277821

KEYWORDS: Reflectivity, Statistical analysis, Ecosystems, Algorithm development, Forestry, Short wave infrared radiation, Remote sensing, Satellites, Earth observing sensors, Satellite imaging

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Proceedings Article | 5 October 2017 Paper

Development of Geometry Normalized Electromagnetic System (GNES) instrument for metal defect detection

Zakaria Zakaria, Muhammad Syukri Surbakti, Saumi Syahreza, Mohd. Zubir Mat Jafri, Kok Chooi Tan

Proceedings Volume 10430, 104300J (2017) https://doi.org/10.1117/12.2278163

KEYWORDS: Metals, Electromagnetism, Defect detection, Transmitters, Receivers, Sensors, Nondestructive evaluation, Data acquisition, Data modeling, Electromagnetic radiation

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Proceedings Article | 5 October 2017 Paper

Analysis of ozone observation at atmospheric monitoring network station using Brewer ozone spectrophotometer

Kok Chooi Tan, Mou Leong Tan, Hwee San Lim, Mohamad Zubir Mat Jafri

Proceedings Volume 10428, 104281L (2017) https://doi.org/10.1117/12.2278069

KEYWORDS: Ozone, Statistical analysis, Spectrophotometry, Chemical analysis, Environmental monitoring, Atmospheric sciences, Meteorology, Chemical reactions, Earth's atmosphere, Atmospheric monitoring

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Proceedings Article | 5 October 2017 Paper

Impacts of post-disaster recovery on land surface temperature after the 2004 earthquake and Indian tsunami: a case study of Banda Aceh, Indonesia

Saumi Syahreza, M. Syukri Surbakti, Kok Chooi Tan, Hwee San Lim, Mohamad Zubir Mat Jafri

Proceedings Volume 10428, 104280K (2017) https://doi.org/10.1117/12.2279001

KEYWORDS: Landsat, Earthquakes, Visible radiation, Thermography, Infrared radiation, Satellites, Earth observing sensors, Environmental monitoring

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Proceedings Article | 11 July 2017 Paper

Power estimation of martial arts movement with different physical, mood, and behavior using motion capture camera

Ahmad Afiq Sabqi Awang Soh, Mohd Zubir Mat Jafri, Nur Zaidi Azraai

Proceedings Volume 10331, 103310X (2017) https://doi.org/10.1117/12.2270124

KEYWORDS: Sensors, Cameras, Motion analysis, Infrared cameras, Motion estimation, Infrared radiation, Infrared sensors, Medicine, Skin, Physics, Metrology

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In Malay world, there is a spirit traditional ritual where they use it as healing practices or for normal life. Malay martial arts (silat) also is not exceptional where some branch of silat have spirit traditional ritual where they said can help them in combat. In this paper, we will not use any ritual, instead we will use some medicinal and environment change when they are performing. There will be 2 performers (fighter) selected, one of them have an experience in martial arts training and another performer does not have experience. Motion Capture (MOCAP) camera will help observe and analyze this move. 8 cameras have been placed in the MOCAP room 2 on each side of the wall facing toward the center of the room from every angle. This will help prevent the loss detection of a marker that been stamped on the limb of a performer. Passive marker has been used where it will reflect the infrared to the camera sensor. Infrared is generated by the source around the camera lens. A 60 kg punching bag was hung on the iron bar function as the target for the performer when throws a punch. Markers also have been stamped on the punching bag so we can detect the movement how far can it swing when hit by the performer. 2 performers will perform 2 moves each with the same position and posture. For every 2 moves, we have made the environment change without the performer notice about it. The first 2 punch with normal environment, second part we have played a positive music to change the performer's mood and third part we have put a medicine (cream/oil) on the skin of the performer. This medicine will make the skin feel a little bit hot. This process repeated to another performer with no experience. The position of this marker analyzed by the Cortex Motion Analysis software where from this data, we can estimate the kinetics and kinematics of the performer. It shows that the increase of kinetics for every part because of the change in the environment, and different result for the 2 performers.

Proceedings Article | 28 June 2017 Paper

Water turbidity optical meter using optical fiber array for topographical distribution analysis

Kussay Nugamesh Mutter, Mohd Zubir Mat Jafri, Stephenie Yeoh

Proceedings Volume 10329, 103294D (2017) https://doi.org/10.1117/12.2270407

KEYWORDS: Water, Optical fibers, Optical arrays, Particles, Sensors, Cladding, Fiber lasers, Glucose, Single mode fibers, Power meters, Refractive index, Fiber optics sensors

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Proceedings Article | 26 June 2017 Paper

Power estimation of martial arts movement using 3D motion capture camera

Nur Zaidi Azraai, Ahmad Afiq Sabqi Awang Soh, Mohd Zubir Mat Jafri

Proceedings Volume 10335, 103351T (2017) https://doi.org/10.1117/12.2270135

KEYWORDS: Calibration, Fourier transforms, Cameras, Infrared cameras, Physics, Mechanics, Infrared radiation, Motion analysis, Optical signal processing, Motion estimation, Stereoscopic cameras, Physiology

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Motion capture camera (MOCAP) has been widely used in many areas such as biomechanics, physiology, animation, arts, etc. This project is done by approaching physics mechanics and the extended of MOCAP application through sports. Most researchers will use a force plate, but this will only can measure the force of impact, but for us, we are keen to observe the kinematics of the movement. Martial arts is one of the sports that uses more than one part of the human body. For this project, martial art ‘Silat’ was chosen because of its wide practice in Malaysia. 2 performers have been selected, one of them has an experienced in ‘Silat’ practice and another one have no experience at all so that we can compare the energy and force generated by the performers. Every performer will generate a punching with same posture which in this project, two types of punching move were selected. Before the measuring start, a calibration has been done so the software knows the area covered by the camera and reduce the error when analyze by using the T stick that have been pasted with a marker. A punching bag with mass 60 kg was hung on an iron bar as a target. The use of this punching bag is to determine the impact force of a performer when they punch. This punching bag also will be stuck with the optical marker so we can observe the movement after impact. 8 cameras have been used and placed with 2 cameras at every side of the wall with different angle in a rectangular room 270 ft² and the camera covered approximately 50 ft². We covered only a small area so less noise will be detected and make the measurement more accurate. A Marker has been pasted on the limb of the entire hand that we want to observe and measure. A passive marker used in this project has a characteristic to reflect the infrared that being generated by the camera. The infrared will reflected to the camera sensor so the marker position can be detected and show in software. The used of many cameras is to increase the precision and improve the accuracy of the marker. Performer movement was recorded and analyzed using software Cortex motion analysis where velocity and acceleration of a performer movement can be measured. With classical mechanics approach we have estimated the power and force of impact and shows that an experienced performer produces more power and force of impact is higher than the inexperienced performer.

Proceedings Article | 26 June 2017 Paper

Feature selection from hyperspectral imaging for guava fruit defects detection

Mohd. Zubir Mat Jafri, Sou Ching Tan

Proceedings Volume 10335, 103351E (2017) https://doi.org/10.1117/12.2270137

KEYWORDS: Hyperspectral imaging, Defect detection, Feature extraction, Feature selection, Light sources and illumination, Optical signal processing, Hyperspectral target detection, Target detection, Reflectivity

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Proceedings Article | 26 June 2017 Paper

Measuring the volume of brain tumour and determining its location in T2-weighted MRI images using hidden Markov random field: expectation maximization algorithm

Mohd. Zubir Mat Jafri, Hayder Saad Abdulbaqi, Kussay Mutter, Iskandar Shahrim Mustapha, Ahmad Fairuz Omar

Proceedings Volume 10335, 103351V (2017) https://doi.org/10.1117/12.2270132

KEYWORDS: Tumors, Image processing algorithms and systems, Binary data, Medical imaging, Brain, Magnetic resonance imaging, Neuroimaging, Expectation maximization algorithms, Optical signal processing, Image classification, Image segmentation, Image acquisition

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Proceedings Article | 26 June 2017 Paper

Graphene based multimode interference coupler as an optical refractive index sensor based on nonlinear modal propagation analysis

M. A. Hassim, M. Tajaldini, M. Mat Jafri

Proceedings Volume 10330, 103301R (2017) https://doi.org/10.1117/12.2270378

KEYWORDS: Wave propagation, Cladding, Absorption, Dielectrics, Graphene, Refractive index, Sensors, Optical sensors, Nonlinear optics, Brain-machine interfaces, Transparency, Optical properties, Waveguides, Optical metrology

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Proceedings Article | 26 June 2017 Paper

Numerical analysis of nonlinear multimode interference waveguide as a refractive index sensor

Stephenie Yeoh, Kussay Nugamesh Mutter, Mohd. Zubir Mat Jafri

Proceedings Volume 10329, 103294G (2017) https://doi.org/10.1117/12.2271400

KEYWORDS: Cladding, Wave propagation, Electrodes, Refractive index, Waveguides, Graphene, Sensors, Numerical analysis, Silicon, Complex systems, Metrology, Optical sensors

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Proceedings Article | 26 June 2017 Paper

Assessment of yearly lidar ratio values in Penang, Malaysia

Mohamad Zubir Mat Jafri, Wei Ying Khor, Hwee San Lim

Proceedings Volume 10330, 103301F (2017) https://doi.org/10.1117/12.2270125

KEYWORDS: Aerosols, Atmospheric particles, Earth's atmosphere, Combustion, Waveguides, LIDAR, Lawrencium, Atmospheric modeling, Humidity, Visibility, Modeling, Systems modeling, Air contamination, Error analysis, Atmospheric optics

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Proceedings Article | 29 April 2016 Paper

Numerical analysis of a 3D optical sensor based on single mode fiber to multimode interference graphene design

Kussay Mutter, Zubir Jafri, Kok Chooi Tan

Proceedings Volume 9899, 98992B (2016) https://doi.org/10.1117/12.2227605

KEYWORDS: Waveguides, 3D surface sensing, Single mode fibers, Sensing systems, Numerical analysis, 3D metrology, Multimode interference devices, Cladding

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Proceedings Article | 27 April 2016 Paper

Self-phase modulation on a graphene used waveguide

Mehdi Tajaldini, Mohd. Zubir Mat Jafri, Hwee San Lim, Kok Chooi Tan

Proceedings Volume 9894, 989419 (2016) https://doi.org/10.1117/12.2227057

KEYWORDS: Nonlinear optics, Modulation, Graphene, Waveguides, Nonlinear optics, Wave propagation, Optoelectronics, Optical limiting, Scanning probe microscopy, Single mode fibers, Refraction, Dielectrics, Waveguide modes, Optical properties

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Proceedings Article | 21 October 2015 Paper

Proposal of all-optical sensor based on nonlinear MMI coupler for multi-purpose usage

M. Tajaldini, M. Z. MatJafri

Proceedings Volume 9652, 965217 (2015) https://doi.org/10.1117/12.2195606

KEYWORDS: Sensors, Waveguides, Refractive index, Brain-machine interfaces, Wave propagation interference, Acoustics, Cladding, Earthquakes, Air contamination, Heart

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Proceedings Article | 20 October 2015 Paper

One-year monitoring of the atmosphere over Penang Island using a ground-based lidar

Wei Ying Khor, Mohd Zubir Matjafri, Hwee San Lim, Wan Shen Hee, Simone Lolli

Proceedings Volume 9645, 96450M (2015) https://doi.org/10.1117/12.2195440

KEYWORDS: Atmospheric particles, Aerosols, LIDAR, Mass attenuation coefficient, Earth's atmosphere, Atmospheric monitoring, Combustion, Signal processing, Atmospheric modeling, Signal attenuation

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Proceedings Article | 14 October 2015 Paper

Investigation variation of carbon dioxide based on GOSAT data in peninsular Malaysia

C. Sim, H. Lim, M. MatJafri

Proceedings Volume 9637, 96372O (2015) https://doi.org/10.1117/12.2195439

KEYWORDS: Carbon dioxide, Satellites, Nanoelectromechanical systems, Carbon monoxide, Combustion, Thermography, Earth observing sensors, Fourier transforms, Thermal effects, Infrared radiation

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Proceedings Article | 14 October 2015 Paper

Mangrove species mapping in Kuala Sepetang Mangrove Forest, Perak using high resolution airborne data

B. Beh, M. MatJafri, H. Lim

Proceedings Volume 9637, 96370E (2015) https://doi.org/10.1117/12.2195435

KEYWORDS: Reflectivity, Associative arrays, Ecosystems, Vegetation, Image resolution, Remote sensing, Digital imaging, Unmanned aerial vehicles, Data acquisition, Cameras

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Proceedings Article | 14 October 2015 Paper

Prediction models for CO2 emission in Malaysia using best subsets regression and multi-linear regression

C. Tan, M. Matjafri, H. Lim

Proceedings Volume 9638, 963812 (2015) https://doi.org/10.1117/12.2195442

KEYWORDS: Carbon dioxide, Data modeling, Buildings, Atmospheric modeling, Combustion, Roads, Statistical modeling, Error analysis, Physics, Climate change

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SPIE Journal Paper | 22 June 2015

Simplified optical fiber RGB system in evaluating intrinsic quality of Sala mango

Ommi Kalsom Yahaya, Mohamad Zubir Mat Jafri, Azlan Abdul Aziz, Ahmad Fairuz Omar

OE, Vol. 54, Issue 06, 067108, (June 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.6.067108

KEYWORDS: Light emitting diodes, Spectrometers, RGB color model, Optical fibers, Visible radiation, Light sources, Sensors, Nondestructive evaluation, Reflectivity, Fiber optics sensors

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Proceedings Article | 20 October 2014 Open Access

Tropospheric Raman Lidar measurements of the vertical aerosol backscattering with range-dependent Lidar ratio in Penang Island, Malaysia, during the dry season (withdrawal notice)

Wan Shen Hee, Wei Ying Khor, Fuyi Tan, Hwee San Lim, Mohamad Matjafri, Simone Lolli

Proceedings Volume 9246, 92460Q (2014) https://doi.org/10.1117/12.2067003

KEYWORDS: LIDAR, Aerosols, Atmospheric particles, Backscatter, Raman spectroscopy, Combustion, Oceanography, Air contamination, Clouds, Data acquisition

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Proceedings Article | 15 May 2014 Paper

UV spectroscopy determination of aqueous lead and copper ions in water

C. Tan, Y. Moo, M. Mat Jafri, H. Lim

Proceedings Volume 9141, 91410N (2014) https://doi.org/10.1117/12.2052349

KEYWORDS: Ions, Lead, Copper, Ultraviolet radiation, Spectroscopy, Absorbance, Absorption, Fiber optics, Visible radiation, Ultraviolet detectors

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Proceedings Article | 8 May 2014 Paper

Development of optical near-infrared spectroscopy instruments for human skin sebum measurement

A. Msabbri, M. Mohamad, M. MatJafri, A. Omar

Proceedings Volume 9129, 91293M (2014) https://doi.org/10.1117/12.2052809

KEYWORDS: Skin, Spectroscopy, Spectroscopes, Absorption, Sensors, Absorbance, Reflectivity, Optical fibers, Near infrared spectroscopy, Near infrared

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Proceedings Article | 1 May 2014 Paper

Proposal of ultra-compact NAND/NOR/XNOR all-optical logic gates based on a nonlinear 3x1 multimode interference

Mehdi Tajaldini, M. Z. Mat Jafri

Proceedings Volume 9136, 91361L (2014) https://doi.org/10.1117/12.2052099

KEYWORDS: Brain-machine interfaces, Logic devices, Waveguides, Multimode interference devices, Nonlinear optics, Geometrical optics, Statistical analysis, Logic, Fused deposition modeling, Wave propagation

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SPIE Journal Paper | 22 October 2013

Process optimization of doping conditions for (100) P-type monocrystalline silicon solar cell using response surface methodology

Khuram Ali, Sohail Khan, Mohd Zubir Mat Jafri

JPE, Vol. 3, Issue 01, 032099, (October 2013) https://doi.org/10.1117/12.10.1117/1.JPE.3.032099

KEYWORDS: Doping, Resistance, Silicon, Diffusion, Mathematical modeling, Solar cells, Silicon solar cells, Statistical analysis, Semiconducting wafers, Error analysis

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Proceedings Article | 18 June 2013 Paper

Nonlinear multimode interference coupler for biological sensing

Mehdi Tajaddini, Mohd Zubir Mat Jafri

Proceedings Volume 8801, 880103 (2013) https://doi.org/10.1117/12.2032153

KEYWORDS: Brain-machine interfaces, Refractive index, Sensors, Waveguides, Glasses, Kerr effect, Cladding, Biosensing, Molecules, Multimode interference devices

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Proceedings Article | 13 May 2013 Paper

The influence of nonlinear modal propagation analysis on MMI power splitters for miniaturization

M. Tajaldini, M. Z. Mat Jafri

Proceedings Volume 8789, 87890P (2013) https://doi.org/10.1117/12.2021558

KEYWORDS: Waveguides, Brain-machine interfaces, Beam propagation method, Wave propagation, Wave propagation interference, Kerr effect, Multimode interference devices, Refractive index, Switching, Image resolution

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Proceedings Article | 19 November 2012 Paper

Water quality assessment in Kelantan delta using remote sensing technique

S. Syahreza, M. Z. MatJafri, H. S. Lim, M. R. Mustapha

Proceedings Volume 8542, 85420X (2012) https://doi.org/10.1117/12.978931

KEYWORDS: Reflectivity, Remote sensing, Satellites, Atmospheric corrections, Sensors, Earth observing sensors, Optical testing, Image quality, Physics, Image analysis

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Proceedings Article | 19 November 2012 Paper

Spectral reflectance of Kelantan Estuary with ALOS data to estimate transparency

S. Syahreza, M. MatJafri, H. Lim

Proceedings Volume 8542, 85420A (2012) https://doi.org/10.1117/12.974459

KEYWORDS: Reflectivity, Transparency, Remote sensing, Satellites, In situ metrology, Earth observing sensors, Calibration, Satellite imaging, Data analysis, Physics

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Proceedings Article | 19 November 2012 Paper

Proposal of a novel method for all optical switching with MMI coupler

M. Tajaldini, Mohd Z. Jafri

Proceedings Volume 8545, 854505 (2012) https://doi.org/10.1117/12.974831

KEYWORDS: Brain-machine interfaces, Switching, Waveguides, Switches, Kerr effect, Refractive index, Wave propagation interference, Nonlinear optics, Polarization, Photonic integrated circuits

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Proceedings Article | 8 November 2012 Paper

Land cover/use mapping using multi-band imageries captured by Cropcam Unmanned Aerial Vehicle Autopilot (UAV) over Penang Island, Malaysia

Tan Fuyi, Beh Boon Chun, Mohd Zubir Mat Jafri, Lim Hwee San, Khiruddin Abdullah, Norhaslinda Mohammad Tahrin

Proceedings Volume 8540, 85400S (2012) https://doi.org/10.1117/12.974911

KEYWORDS: Unmanned aerial vehicles, Satellites, Satellite imaging, Image classification, Vegetation, Digital cameras, Associative arrays, Image resolution, Image enhancement, Artificial neural networks

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Proceedings Article | 1 November 2012 Paper

Mapping of methane from Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY)

K. C. Tan, H. S. Lim, M. Z. MatJafri

Proceedings Volume 8534, 85340N (2012) https://doi.org/10.1117/12.974790

KEYWORDS: Methane, Atmospheric chemistry, Absorption, Satellites, Spectroscopy, Climatology, Cartography, Algorithm development, Atmospheric sensing, Gases

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Proceedings Article | 25 October 2012 Paper

The effects of orography on cloud and rainfall patterns during typhoon Ketsana (2009)

Tan Fuyi, Mohd Zubir MatJafri, Hwee-San Lim, Khiruddin Abdullah

Proceedings Volume 8538, 853819 (2012) https://doi.org/10.1117/12.974796

KEYWORDS: Clouds, Phase modulation, Meteorology, Data modeling, Satellites, Ions, Remote sensing, Liquid crystal lasers, Technetium, Neodymium

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Proceedings Article | 25 October 2012 Paper

Total ozone column distribution over peninsular Malaysia from scanning imaging absorption spectrometer for atmospheric cartography (SCIAMACHY)

K. C. Tan, H. S. Lim, M. Z. MatJafri

Proceedings Volume 8538, 85380Y (2012) https://doi.org/10.1117/12.974792

KEYWORDS: Ozone, Satellites, Absorption, Spectroscopy, Cartography, Atmospheric chemistry, Ultraviolet radiation, Atmospheric monitoring, Ecosystems, Environmental sensing

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SPIE Journal Paper | 21 May 2012

Regression analysis in modeling of air surface temperature and factors affecting its value in Peninsular Malaysia

Jasim Rajab, Mohd Zubir Jafri, Hwee-San Lim, Khiruddin Abdullah

OE, Vol. 51, Issue 10, 101702, (May 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.10.101702

KEYWORDS: Nanoelectromechanical systems, Atmospheric modeling, Carbon monoxide, Coastal modeling, Gases, Data modeling, Satellites, Temperature metrology, Optical engineering, Clouds

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Proceedings Article | 16 November 2010 Paper

Aerosol optical thickness retrieval by using a handheld spectroradiometer over Penang Island, Malaysia

H. S. Lim, M. Z. MatJafri, K. Abdullah, N. M. Saleh

Proceedings Volume 7857, 78571B (2010) https://doi.org/10.1117/12.869492

KEYWORDS: Aerosols, Transmittance, Atmospheric particles, Atmospheric optics, Atmospheric physics, Solar radiation, Molecules, Atmospheric modeling, Remote sensing, Earth's atmosphere

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Proceedings Article | 16 November 2010 Paper

Land cover mapping based on a frequency based contextual classifier from remote sensing data over Penang Island, Malaysia

H. S. Lim, M. Z. MatJafri, K. Abdullah

Proceedings Volume 7857, 78571F (2010) https://doi.org/10.1117/12.869502

KEYWORDS: Satellites, Earth observing sensors, Satellite imaging, Remote sensing, Image classification, Associative arrays, Accuracy assessment, Clouds, Digital imaging, Raster graphics

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Proceedings Article | 16 November 2010 Paper

Assessment of ALOS PALSAR data for land cover/land use mapping in Malaysia

C. K. Sim, K. Abdullah, M. Z. MatJafri, H. S. Lim

Proceedings Volume 7857, 78571H (2010) https://doi.org/10.1117/12.869504

KEYWORDS: Radar, Backscatter, Polarization, Image classification, Satellites, Associative arrays, Earth observing sensors, Image processing, Receivers, Dielectric polarization

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Proceedings Article | 13 November 2010 Paper

Application of THEOS for PM10 mapping over Penang Island, Malaysia

H. S. Lim, M. Z. MatJafri, K. Abdullah

Proceedings Volume 7857, 78570F (2010) https://doi.org/10.1117/12.869597

KEYWORDS: Reflectivity, Atmospheric particles, Satellites, Aerosols, Data acquisition, Earth observing sensors, Algorithm development, Landsat, Satellite imaging, Atmospheric sensing

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Proceedings Article | 13 November 2010 Paper

Performances of frequency-based contextual classifier in land use/cover classification using high resolution satellite images

M. R. Mustapha, H. S. Lim, M. Z. MatJafri, F. Hassan

Proceedings Volume 7857, 78570S (2010) https://doi.org/10.1117/12.869478

KEYWORDS: Image classification, Remote sensing, Matrices, High resolution satellite images, Sensors, Speckle, Spatial resolution, Error analysis, Optical resolution, Image analysis

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Proceedings Article | 13 November 2010 Paper

Remotely based monitoring of the mangroves over Penang Island, Malaysia

B. C. Beh, M. Z. MatJafri, H. S. Lim

Proceedings Volume 7857, 78570Q (2010) https://doi.org/10.1117/12.869596

KEYWORDS: Vegetation, Satellites, Remote sensing, Image classification, Earth observing sensors, Satellite imaging, Landsat, Image processing, Image filtering, RGB color model

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Proceedings Article | 4 November 2010 Paper

Cropcam UAV images for land use/land cover over Penang Island, Malaysia using neural network approach

Faez Hassan, H. Lim, M. Mat Jafri

Proceedings Volume 7862, 78620O (2010) https://doi.org/10.1117/12.869454

KEYWORDS: Neural networks, Unmanned aerial vehicles, Image classification, Digital cameras, Image processing, Photography, Image resolution, Satellites, Global Positioning System, Satellite imaging

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Proceedings Article | 4 November 2010 Paper

TSS monitoring by using THEOS satellite imagery over Penang Island, Malaysia

H. S. Lim, M. Z. MatJafri, K. Abdullah

Proceedings Volume 7858, 785804 (2010) https://doi.org/10.1117/12.869488

KEYWORDS: Satellites, Water, Earth observing sensors, Satellite imaging, Absorption, Reflectivity, Remote sensing, Image quality, Calibration, Backscatter

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Proceedings Article | 29 October 2010 Paper

Climate affected by dust aerosol over arid region of Makkah, Saudi Arabia

N. Othman, M. MatJafri, H. Lim, K. Abdullah

Proceedings Volume 7859, 78590L (2010) https://doi.org/10.1117/12.869507

KEYWORDS: Aerosols, Atmospheric particles, Climatology, MODIS, Earth's atmosphere, Atmospheric modeling, Atmospheric optics, Ocean optics, Satellites, Climate change

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Proceedings Article | 14 May 2010 Paper

Fixed weight Hopfield Neural Network based on optical implementation of all-optical MZI-XNOR logic gate

Kussay Nugamesh Mutter, Mohd Zubir Mat Jafri, Azlan Abdul Aziz

Proceedings Volume 7717, 77170X (2010) https://doi.org/10.1117/12.854838

KEYWORDS: RGB color model, Neural networks, Logic devices, Data modeling, Binary data, Control systems, Mach-Zehnder interferometers, Neurons, Computing systems, Optical design

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Proceedings Article | 11 May 2009 Paper

Multispectral air pollution sensor to characterize of total suspended particulates (TSP) concentration

S. G. Daraigan, M. Z. MatJafri, K. Abdullah, H. S. Lim, C. J. Wong

Proceedings Volume 7336, 73361O (2009) https://doi.org/10.1117/12.820306

KEYWORDS: Sensors, Air contamination, Optical sensors, Light emitting diodes, Photodetectors, Earth's atmosphere, Algorithm development, Particles, Visible radiation, Photodiodes

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Proceedings Article | 11 May 2009 Paper

Temporal and spatial air quality monitoring using internet protocol camera and LANSAT5 satellite image

C. J. Wong, H. S. Lim, M. Z. MatJafri, K. Abdullah, T. S. Chin

Proceedings Volume 7336, 73361P (2009) https://doi.org/10.1117/12.820322

KEYWORDS: Reflectivity, Atmospheric particles, IP cameras, Satellites, Landsat, Algorithm development, Image quality, Earth observing sensors, Satellite imaging, Aerosols

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Proceedings Article | 28 April 2009 Paper

Using webcam for indoor air quality monitoring

C. J. Wong, C. K. Teo, M. Z. MatJafri, K. Abdullah, H. S. Lim

Proceedings Volume 7341, 734110 (2009) https://doi.org/10.1117/12.820329

KEYWORDS: Algorithm development, Reflectivity, Phase modulation, Image processing, Cameras, Atmospheric particles, Digital imaging, Aerosols, Image quality, Molecules

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Proceedings Article | 28 April 2009 Paper

Water quality mapping using Landsat TM imagery

H. S. Lim, M. Z. MatJafri, K. Abdullah, A. N. Alias, C. J. Wong, M. R. Mustapha-Rosli, N. Mohd Saleh

Proceedings Volume 7341, 734107 (2009) https://doi.org/10.1117/12.820308

KEYWORDS: Algorithm development, Landsat, Water, Reflectivity, Satellites, Absorption, Satellite imaging, Earth observing sensors, Calibration, Optical properties

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Proceedings Article | 27 April 2009 Paper

Determination of particle concentration in the air using a digital SLR camera

C. Wong, M. Mat Jafri, K. Abdullah, H. Lim

Proceedings Volume 7334, 73341I (2009) https://doi.org/10.1117/12.820326

KEYWORDS: Cameras, Particles, Reflectivity, Atmospheric particles, Algorithm development, Digital cameras, Aerosols, Molecules, Scattering, Pollution

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Proceedings Article | 27 April 2009 Paper

Sea surface temperature algorithm with transmittance and sea surface emissivity dependence

H. Ng, M. MatJafri, K. Abdullah, C. Wong

Proceedings Volume 7334, 73341H (2009) https://doi.org/10.1117/12.820302

KEYWORDS: Transmittance, Sensors, Algorithm development, Temperature metrology, MODIS, Atmospheric sensing, Clouds, Infrared radiation, Data modeling, Black bodies

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Proceedings Article | 15 October 2008 Paper

Determination of cloud and aerosol layers using CALIPSO and image processing

A. Alias, M. MatJafri, H. Lim, K. Abdullah, N. Mohd. Saleh

Proceedings Volume 7111, 71110D (2008) https://doi.org/10.1117/12.800191

KEYWORDS: Aerosols, Clouds, Image processing, LIDAR, Atmospheric particles, Radiation effects, Satellites, Troposphere, Earth's atmosphere, Infrared radiation

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Proceedings Article | 13 October 2008 Paper

A satellite AOT derived from the ground sky transmittance measurements

H. Lim, M. MatJafri, K. Abdullah, K. Tan, C. Wong, N. Mohd. Saleh

Proceedings Volume 7110, 711019 (2008) https://doi.org/10.1117/12.800067

KEYWORDS: Reflectivity, Atmospheric particles, Satellites, Transmittance, Aerosols, Atmospheric optics, Atmospheric monitoring, Landsat, Algorithm development, Earth observing sensors

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Proceedings Article | 13 October 2008 Paper

Water quality mapping using remote sensing technique in Penang Straits, Malaysia

H. S. Lim, M. Z. MatJafri, K. Abdullah, A. N. Alias, N. Mohd. Saleh

Proceedings Volume 7105, 71050A (2008) https://doi.org/10.1117/12.800573

KEYWORDS: Satellites, Remote sensing, Earth observing sensors, Satellite imaging, Algorithm development, Image quality, Global Positioning System, Reflectivity, Calibration, Sensors

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Proceedings Article | 13 October 2008 Paper

Using satellite remote sensing to monitor the total suspended solids (TSS) over Penang Island, Malaysia

H. S. Lim, M. Z. MatJafri, K. Abdullah, N. Mohd. Saleh

Proceedings Volume 7105, 71050Z (2008) https://doi.org/10.1117/12.800159

KEYWORDS: Reflectivity, Satellites, Algorithm development, Remote sensing, Solids, Atmospheric corrections, Calibration, Absorption, Backscatter, Earth observing sensors

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Proceedings Article | 10 October 2008 Paper

Remote sensing retrievals from SPOT measurements of aerosol over Penang Island, Malaysia

H. S. Lim, M. Z. MatJafri, K. Abdullah, K. C. Tan, C. J. Wong, N. Mohd. Saleh

Proceedings Volume 7109, 71090Y (2008) https://doi.org/10.1117/12.800166

KEYWORDS: Reflectivity, Satellites, Algorithm development, Aerosols, Earth observing sensors, Atmospheric particles, Satellite imaging, Atmospheric optics, Remote sensing, Air contamination

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Proceedings Article | 7 October 2008 Paper

Using visible remotely sensed data for air quality study

H. S. Lim, M. Z. MatJafri, K. Abdullah, K. C. Tan, C. J. Wong, N. Mohd Saleh

Proceedings Volume 7114, 71140T (2008) https://doi.org/10.1117/12.800163

KEYWORDS: Reflectivity, Atmospheric particles, Satellites, Algorithm development, Aerosols, Landsat, Earth observing sensors, Air contamination, Visible radiation, Mid-IR

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Proceedings Article | 7 October 2008 Paper

An initial assessment of the CALIPSO lidar data on stratospheric aerosol backscatter coefficients over peninsular Malaysia

A. N. Alias, M. Z. MatJafri, H. S. Lim, K. Abdullah, N. Mohd Saleh

Proceedings Volume 7114, 71140U (2008) https://doi.org/10.1117/12.800186

KEYWORDS: Aerosols, LIDAR, Backscatter, Clouds, Stratosphere, Satellites, Image processing, Polarization, Earth observing sensors, Image enhancement

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Proceedings Article | 7 October 2008 Paper

Merging of multi-temporal SST data at South China Sea

H. G. Ng, M. Z. MatJafri, K. Abdullah, H. S. Lim

Proceedings Volume 7114, 71140V (2008) https://doi.org/10.1117/12.800575

KEYWORDS: Clouds, Composites, Reflectivity, Infrared radiation, Infrared imaging, Calibration, Sensors, Remote sensing, Satellites, Radiometry

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Proceedings Article | 7 October 2008 Paper

Algorithm for remote sensing of land surface temperature

Sultan AlSultan, H. S. Lim, M. Z. MatJafri, K. Abdullah

Proceedings Volume 7114, 71140R (2008) https://doi.org/10.1117/12.800150

KEYWORDS: Algorithm development, Landsat, Satellites, Remote sensing, Vegetation, Solar radiation, Solar radiation models, Image processing software, Thermography, Earth observing sensors

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Proceedings Article | 2 October 2008 Paper

Characteristic of 2D triangular lattice of photonic crystals for microwave and photonic devices

K. L. Low, M. Z. Mat Jafri, Sohail Khan, A. J. Bin Yusof

Proceedings Volume 7117, 71170V (2008) https://doi.org/10.1117/12.800173

KEYWORDS: Dielectrics, Microwave radiation, Wave propagation, Photonic crystals, Scattering, Photonic devices, Dispersion, Medium wave, Maxwell's equations, Terahertz technology

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Proceedings Article | 1 October 2008 Paper

Lidar surface elevation and digital elevation map (DEM) of the CALIPSO LIDAR data over Peninsular Malaysia

A. Alias, M. MatJafri, H. Lim, K. Abdullah, N. Mohd. Saleh

Proceedings Volume 7111, 71110F (2008) https://doi.org/10.1117/12.800177

KEYWORDS: LIDAR, Signal detection, Sensors, Backscatter, Spatial resolution, Radar, Error analysis, Polarization, Cerium, Signal analysis

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Proceedings Article | 1 October 2008 Paper

Application of remote sensing in coastal change detection after the tsunami event in Indonesia

H. Lim, M. MatJafri, K. Abdullah, N. Mohd. Saleh, M. Surbakti

Proceedings Volume 7110, 71100C (2008) https://doi.org/10.1117/12.800061

KEYWORDS: Satellites, Remote sensing, Landsat, Satellite imaging, Earth observing sensors, Image classification, Spatial resolution, Earthquakes, Image processing software, Vegetation

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Proceedings Article | 18 April 2008 Paper

Algorithm for haze determination using digital camera images

C. J. Wong, M. Z. MatJafri, K. Abdullah, H. S. Lim, S. A. Hashim

Proceedings Volume 6951, 69510E (2008) https://doi.org/10.1117/12.777897

KEYWORDS: Digital cameras, Algorithm development, Atmospheric particles, Reflectivity, Air contamination, Aerosols, Detection and tracking algorithms, Atmospheric modeling, Atmospheric optics, Data modeling

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Proceedings Article | 17 March 2008 Paper

Land cover mapping after the tsunami event over Nanggroe Aceh Darussalam (NAD) province, Indonesia

H. S. Lim, M. Z. MatJafri, K. Abdullah, A. N. Alias, N. Mohd. Saleh, C. J. Wong, M. S. Surbakti

Proceedings Volume 6977, 69770H (2008) https://doi.org/10.1117/12.777256

KEYWORDS: Remote sensing, Image classification, Satellites, Landsat, Satellite imaging, Earth observing sensors, Accuracy assessment, Analytical research, Digital imaging, Physics

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Proceedings Article | 17 March 2008 Paper

High-spatial resolution land cover mapping using remotely sensed image

H. S. Lim, S. AlSultan, M. Z. MatJafri, K. Abdullah, A. N. Alias, C. J. Wong, N. Mohd. Saleh

Proceedings Volume 6977, 69770S (2008) https://doi.org/10.1117/12.777240

KEYWORDS: Satellites, Image classification, Satellite imaging, Earth observing sensors, Remote sensing, Digital imaging, Accuracy assessment, Image resolution, Associative arrays, Image processing

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Proceedings Article | 17 March 2008 Paper

Calibration of visible and near infrared spectrums for measuring freshness of vegetables

Faisal Abdullah, M. Z. Mat Jafri, M. S. Jaafar, C. J. Wong

Proceedings Volume 6939, 69390J (2008) https://doi.org/10.1117/12.777713

KEYWORDS: Light sources, Near infrared, Light emitting diodes, Visible radiation, Scattering, Sensors, Backscatter, Tissue optics, Absorption, Calibration

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Proceedings Article | 16 May 2007 Paper

Dwi-detector optical sensor for measuring the concentration of total suspended solids in waters

S. Daraigan, M. MatJafri, K. Abdullah, H. Lim, S. Hashim

Proceedings Volume 6567, 65671O (2007) https://doi.org/10.1117/12.719060

KEYWORDS: Optical sensors, Solids, Sensors, Light scattering, Light emitting diodes, Scattering, Detection and tracking algorithms, Particles, Algorithm development, Absorption

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Proceedings Article | 16 May 2007 Paper

PM10 retrieval over the water surface of Penang Straits from Landsat TM5 data

H. Lim, M. MatJafri, K. Abdullah, N. Mohd. Saleh, S. Hashim

Proceedings Volume 6565, 656520 (2007) https://doi.org/10.1117/12.719064

KEYWORDS: Reflectivity, Atmospheric particles, Landsat, Satellites, Algorithm development, Aerosols, Atmospheric optics, Molecules, Calibration, Earth observing sensors

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Proceedings Article | 7 May 2007 Paper

PM10 retrieval in urban area from space

H. Lim, M. MatJafri, K. Abdullah, N. Mohd. Saleh

Proceedings Volume 6565, 65651Z (2007) https://doi.org/10.1117/12.719059

KEYWORDS: Reflectivity, Algorithm development, Atmospheric particles, Aerosols, Satellites, Molecules, Image processing software, Remote sensing, Landsat, Earth observing sensors

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Proceedings Article | 4 May 2007 Paper

Real-time air quality monitoring by using internet video surveillance camera

C. Wong, H. Lim, M. MatJafri, K. Abdullah, K. Low

Proceedings Volume 6538, 65381Q (2007) https://doi.org/10.1117/12.719137

KEYWORDS: IP cameras, Cameras, Internet, Video surveillance, Reflectivity, Algorithm development, Image compression, Error analysis, Sensors, Atmospheric particles

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Proceedings Article | 30 April 2007 Paper

Real-time PM10 concentration monitoring on Penang Bridge by using traffic monitoring CCTV

K. L. Low, H. S. Lim, M. MatJafri, K. Abdullah, C. J. Wong

Proceedings Volume 6560, 65600R (2007) https://doi.org/10.1117/12.719055

KEYWORDS: Reflectivity, Algorithm development, Bridges, Cameras, Atmospheric particles, Content addressable memory, Error analysis, Atmospheric modeling, Internet, Calibration

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Proceedings Article | 9 April 2007 Paper

Retrieval of air quality information using image processing technique

H. S. Lim, M. MatJafri, K. Abdullah, N. M. Saleh

Proceedings Volume 6541, 654107 (2007) https://doi.org/10.1117/12.719058

KEYWORDS: Reflectivity, Aerosols, Atmospheric particles, Algorithm development, Landsat, Satellites, Visible radiation, Molecules, Image quality, Earth observing sensors

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Proceedings Article | 9 April 2007 Paper

Application of remote sensing for land surface temperature retrieval over Mecca

H. S. Lim, M. MatJafri, K. Abdullah, N. M. Saleh, Sultan AlSultan

Proceedings Volume 6541, 65410D (2007) https://doi.org/10.1117/12.719062

KEYWORDS: Landsat, Satellites, Solar radiation models, Remote sensing, Temperature metrology, Thermography, Infrared radiation, Aluminum, Sensors, Earth observing sensors

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Proceedings Article | 10 May 2006 Paper

Water pollution monitoring using optical sensor based on transmitted light

Sami Gumaan Daraigan, Mohd Matjafri, Khiruddin Abdullah, Lim San, Syahril Hashim

Proceedings Volume 6201, 62010U (2006) https://doi.org/10.1117/12.665421

KEYWORDS: Solids, Light emitting diodes, Optical sensors, Sensors, Algorithm development, Light scattering, Particles, Water contamination, Optical testing, Scattering

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Proceedings Article | 10 May 2006 Paper

Multi-spectral optical sensor based on light scattering for measuring total suspended solids

Mohd Matjafri, Khiruddin Abdullah, Lim San, Wong Jeng

Proceedings Volume 6201, 62010W (2006) https://doi.org/10.1117/12.665407

KEYWORDS: Light scattering, Solids, Light emitting diodes, Optical sensors, Sensors, Photodetectors, Scattering, Particles, Silicon, Photodiodes

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Proceedings Article | 17 April 2006 Paper

Land cover mapping from remote sensing data

H. Lim, M. MatJafri, K. Abdullah, N. Saleh, C. Wong, Sultan AlSultan

Proceedings Volume 6245, 62450P (2006) https://doi.org/10.1117/12.665433

KEYWORDS: Associative arrays, Remote sensing, Image classification, Satellites, Landsat, Satellite imaging, Earth observing sensors, Scene classification, Physics, Aluminum

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Proceedings Article | 16 June 2003 Paper

Multispectral back-scattering spectrometer for total suspended solids measurement

Mohammad Mat Jafri, Khiruddin Abdullah, Stephen Marshall, Hwe Lim

Proceedings Volume 4897, (2003) https://doi.org/10.1117/12.466844

KEYWORDS: Solids, Spectroscopy, Water, Algorithm development, Absorption, Remote sensing, Statistical analysis, Calibration, Satellites, Sensors

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Proceedings Article | 8 May 2003 Paper

Algorithm for total suspended solids mapping using digital camera images

Mohammad Mat Jafri, Khiruddin Abdullah, Hwe San Lim, Mohd Noordin Abu Bakar, Zubir Din, Steve Marshall

Proceedings Volume 4892, (2003) https://doi.org/10.1117/12.467269

KEYWORDS: Digital cameras, Algorithm development, Reflectivity, Solids, Calibration, Remote sensing, Atmospheric corrections, Fourier transforms, Water, Airborne remote sensing

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Proceedings Article | 8 May 2003 Paper

Mapping of total suspended solids in reservoir using images captured by a conventional digital camera from a low-altitude light aircraft

Mohammad Mat Jafri, Khiruddin Abdullah, Hwe San Lim, Wan Ruslan Ismail

Proceedings Volume 4892, (2003) https://doi.org/10.1117/12.466076

KEYWORDS: Digital cameras, Calibration, Remote sensing, Solids, Image acquisition, Satellites, Earth observing sensors, Sensors, Cameras, Image analysis

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Proceedings Article | 15 March 2002 Paper

Multispectral back-scattering spectrometer for water quality measurement

Mohammad Mat Jafri, Khiruddin Abdullah, Mohammed Abu Bakar, Stephen Marshall

Proceedings Volume 4710, (2002) https://doi.org/10.1117/12.459571

KEYWORDS: Backscatter, Spectroscopy, Algorithm development, Water, Absorption, Satellites, Statistical analysis, Remote sensing, Quality measurement, Water contamination

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Proceedings Article | 14 January 2002 Paper

Algorithm for generating bathymetric chart from remote sensing data

Khiruddin Abdullah, Mohammad Mat Jafri, Z. Din

Proceedings Volume 4544, (2002) https://doi.org/10.1117/12.452748

KEYWORDS: Water, Calibration, Remote sensing, Satellites, Algorithm development, Earth observing sensors, Clouds, Data acquisition, Atmospheric sensing, Reflectivity

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Proceedings Article | 20 August 2001 Paper

Use of inherent optical properties for determination of water quality

Khiruddin Abdullah, Mohd Mat Jafri, Zubir Din

Proceedings Volume 4381, (2001) https://doi.org/10.1117/12.437041

KEYWORDS: Water, Absorption, Algorithm development, Optical properties, Reflectivity, Calibration, Data modeling, Solids, Solid modeling, Satellites

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Proceedings Article | 23 March 2001 Paper

SST algorithm based on radiative transfer model

Mohd Mat Jafri, Khiruddin Abdullah, Alui Bahari

Proceedings Volume 4360, (2001) https://doi.org/10.1117/12.420990

KEYWORDS: Transmittance, Clouds, Optical coherence tomography, Algorithm development, Satellites, Atmospheric modeling, Infrared radiation, Temperature metrology, Atmospheric sensing, Radiative transfer

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Proceedings Article | 4 January 1995 Paper

Efficient algorithm for the detection of parabolic curves

Mohammad Mat Jafri, Farzin Deravi

Proceedings Volume 2356, (1995) https://doi.org/10.1117/12.198623

KEYWORDS: Detection and tracking algorithms, Hough transforms, Vision geometry, Binary data, Edge detection, Curium, Electronics engineering, 3D image processing, Image processing, Image analysis

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