Dr. Mani Maran Ratnam Profile

Dr. Mani Maran Ratnam

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Publications (9)

SPIE Journal Paper | 14 November 2022

Correction of perspective distortion and intensity errors in projected fringe patterns in phase-measuring deflectometry

Meng Lip Lim, Mani Maran Ratnam, Kin Sam Yen, Shanyu Chua

OE, Vol. 61, Issue 11, 114107, (November 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.11.114107

KEYWORDS: Fringe analysis, Distortion, Cameras, Mirrors, Projection systems, Calibration, Optical engineering, Algorithm development, Spherical lenses, Imaging systems

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SPIE Journal Paper | 25 April 2019

Two-axes tilt sensing using circular gratings moiré

Pei Ying Tan, Kin Sam Yen, Fauziah Ahmad, Mani Maran Ratnam

OE, Vol. 58, Issue 04, 044103, (April 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.4.044103

KEYWORDS: Optical engineering, Image processing, Phase shifts, Landslide (networking), Gaussian filters, Head-mounted displays, Computer simulations, Fiber optic illuminators, Prototyping, Image filtering

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SPIE Journal Paper | 24 December 2015

Artificial neural network approach for moiré fringe center determination

Wing Hon Woo, Mani Maran Ratnam, Kin Sam Yen

JEI, Vol. 24, Issue 06, 063021, (December 2015) https://doi.org/10.1117/12.10.1117/1.JEI.24.6.063021

KEYWORDS: Error analysis, Artificial neural networks, Neurons, Moire patterns, Image processing, Detection and tracking algorithms, Neural networks, Fringe analysis, Algorithm development, Inspection

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SPIE Journal Paper | 1 December 2009

Error-based autofocus system using image feedback in a liquid-filled diaphragm lens

Soren Abdullah, Mani Ratnam, Zahurin Samad

OE, Vol. 48, Issue 12, 123602, (December 2009) https://doi.org/10.1117/12.10.1117/1.3275450

KEYWORDS: Detection and tracking algorithms, Image processing, Optical engineering, Control systems, Error analysis, Algorithm development, CCD cameras, Optical components, Liquid crystals, CCD image sensors

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Proceedings Article | 3 October 2008 Paper

Crack displacement sensing and measurement in concrete using circular grating moire fringes and pattern matching

H. Chan, K. Yen, M. Ratnam

Proceedings Volume 7155, 715529 (2008) https://doi.org/10.1117/12.814583

KEYWORDS: Moire patterns, Image filtering, Image processing, Image enhancement, Deflectometry, Digital filtering, Optical filters, Fringe analysis, Algorithm development, Image resolution

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SPIE Journal Paper | 1 September 2001

Three-dimensional object classification using shadow moire and neural network

Mani Ratnam, Chee Lim, Ai Khor

OE, Vol. 40, Issue 09, (September 2001) https://doi.org/10.1117/12.10.1117/1.1391260

KEYWORDS: Neural networks, 3D image processing, Light sources and illumination, Image classification, Image processing, Laser scanners, Fringe analysis, Optical filters, Image contrast enhancement, Neurons

SPIE Journal Paper | 1 October 2000

Edge detection in a homogeneous background using the phase-shift fringe projection method

Mani Ratnam

OE, Vol. 39, Issue 10, (October 2000) https://doi.org/10.1117/12.10.1117/1.1308174

KEYWORDS: Edge detection, Image segmentation, Image filtering, Fringe analysis, Phase shifts, Image processing, Detection and tracking algorithms, Optical engineering, Error analysis, Structured light

Proceedings Article | 30 May 2000 Paper

Edge detection in multisurface objects in a homogeneous background using the phase-shift fringe projection method

Mani Ratnam

Proceedings Volume 4067, (2000) https://doi.org/10.1117/12.386703

KEYWORDS: Edge detection, Image filtering, Image processing, Algorithm development, Computer simulations, Sensors, Digital filtering, Detection and tracking algorithms, Mirrors, Structured light

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SPIE Journal Paper | 1 January 1992

Measurement of thermal expansion of a piston using holographic and electronic speckle pattern interferometry

Mani Ratnam, W. Evans, John Tyrer

OE, Vol. 31, Issue 01, (January 1992) https://doi.org/10.1117/12.10.1117/12.56053

KEYWORDS: Holography, Mirrors, Video, Cameras, Photography, Interferometry, Holographic interferometry, Speckle pattern, Fringe analysis, Distortion

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Showing 5 of 9 publications

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