Dr. Percival F. Almoro Profile

Dr. Percival F. Almoro

at Univ of the Philippines

SPIE Involvement:

Author

Proceedings Article | 4 March 2024 Paper

Removal of local phase errors in conventional speckle phase retrieval using random phase patch perturbation method

Jonel Binamira, Percival Almoro

Proceedings Volume 13070, 130701J (2024) https://doi.org/10.1117/12.3022655

KEYWORDS: Speckle, Phase retrieval, Speckle pattern, Overfitting, Reconstruction algorithms, Spherical lenses, Light sources and illumination, Wave propagation, Diffusers, Wavefront reconstruction

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Proceedings Article | 4 March 2024 Paper

Noise-robust phase compensation using principal component analysis with guided parameter adjustment

Percival Almoro, Christian Ray Buco

Proceedings Volume 13070, 130701D (2024) https://doi.org/10.1117/12.3021808

KEYWORDS: Phase compensation, Wavefront aberrations, Principal component analysis, Wavefronts, Discontinuities, Wavefront reconstruction, Reconstruction algorithms, Phase unwrapping, Evolutionary algorithms, Error analysis

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Proceedings Article | 24 January 2019 Paper

Enhanced schlieren imaging applied in heat and air jet visualizations: a wave propagation-based model

Gilbert Oca, Percival Almoro

Proceedings Volume 11052, 110521W (2019) https://doi.org/10.1117/12.2523886

KEYWORDS: Wave propagation, Refractive index, Diffraction, Visualization, Geometrical optics, Image filtering, Visual process modeling, Schlieren techniques, Convection

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Proceedings Article | 26 June 2017 Paper

Digital micromirror device as amplitude diffuser for multiple-plane phase retrieval

Timothy Joseph Abregana, Nathaniel Hermosa, Percival Almoro

Proceedings Volume 10330, 103300G (2017) https://doi.org/10.1117/12.2270182

KEYWORDS: Binary data, Wave propagation, Glasses, Phase retrieval, Digital micromirror devices, Diffusers, Wavefronts, Reconstruction algorithms, Speckle, Phase measurement, Scattering, Holography, Diffraction

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SPIE Journal Paper | 4 August 2016

Object localization using the statistical behavior of volume speckle fields

Timothy Joseph Abregana, Percival Almoro

OE, Vol. 55, Issue 12, 121720, (August 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.12.121720

KEYWORDS: Speckle, Wavefronts, Fringe analysis, Wave propagation, Spiral phase plates, Holograms, Error analysis, Digital holography, Reconstruction algorithms, Optical engineering

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Proceedings Article | 24 August 2015 Paper

Enhanced axial localization of rough objects using statistical fringe processing algorithm

Percival Almoro, Timothy Joseph Abregana

Proceedings Volume 9660, 96600F (2015) https://doi.org/10.1117/12.2196757

KEYWORDS: Fringe analysis, Speckle, Wavefronts, Spiral phase plates, Digital holography, Spatial frequencies, Light sources, Holography, Algorithm development, Error analysis

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Proceedings Article | 7 June 2013 Paper

Phase object localization using the statistical behavior of reconstructed wavefronts

T. J. Abregana, P. Almoro

Proceedings Volume 8883, 88830D (2013) https://doi.org/10.1117/12.2022106

KEYWORDS: Wavefronts, Glasses, Spiral phase plates, Wave propagation, Detection and tracking algorithms, Holograms, Digital holography, Cameras, Reconstruction algorithms, Light wave propagation

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Proceedings Article | 15 May 2012 Paper

3D shape measurement using deterministic phase retrieval and a partially developed speckle field

Percival Almoro, Laura Waller, Mostafa Agour, Claas Falldorf, Giancarlo Pedrini, Wolfgang Osten, Steen Hanson

Proceedings Volume 8384, 83840Q (2012) https://doi.org/10.1117/12.919223

KEYWORDS: Speckle, Phase retrieval, Wavefronts, Diffusers, Spatial light modulators, Speckle pattern, 3D metrology, Diffraction, Wave propagation, Cameras

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Proceedings Article | 31 August 2009 Paper

Computerized laser wavefront alignment with aberration correction using a speckle-based phase retrieval method

Percival Almoro, Steen Hanson

Proceedings Volume 7382, 73824W (2009) https://doi.org/10.1117/12.835294

KEYWORDS: Wavefronts, Phase retrieval, Diffusers, Aberration correction, Speckle, Monochromatic aberrations, Reconstruction algorithms, Spherical lenses, Sensors, Wave propagation

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Proceedings Article | 3 October 2008 Paper

Complete deformation analysis of transparent samples using digital shearography and holography

Francesca Celine I. Catalan, Raphael Santos, Percival Almoro

Proceedings Volume 7155, 715536 (2008) https://doi.org/10.1117/12.814616

KEYWORDS: Digital holography, Shearography, Holography, Glasses, Statistical analysis, Holographic interferometry, Birefringence, 3D image reconstruction, Strain analysis, Holograms

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Proceedings Article | 3 October 2008 Paper

Power loss due to beam splitter cascade in the simultaneous sampling of a volume speckle field for phase retrieval

Anne Margarette S. Maallo, Percival Almoro

Proceedings Volume 7155, 71551J (2008) https://doi.org/10.1117/12.814556

KEYWORDS: Speckle, Beam splitters, Phase retrieval, Laser metrology, Speckle pattern, Sensors, Optical simulations, Temperature metrology, Optical turbulence, Environmental sensing

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Proceedings Article | 11 August 2008 Paper

Phase error correction in wavefront curvature sensing via phase retrieval

Percival Almoro, Steen Hanson

Proceedings Volume 7064, 70640F (2008) https://doi.org/10.1117/12.795852

KEYWORDS: Wavefronts, Fringe analysis, Phase retrieval, Speckle, Spherical lenses, Wavefront sensors, Sensors, Digital holography, Wave propagation, Reconstruction algorithms

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Proceedings Article | 18 June 2007 Paper

Phase retrieval using a random amplitude mask for wavefront sensing

Arun Anand, Giancarlo Pedrini, Wolfgang Osten, Percival Almoro

Proceedings Volume 6617, 66170J (2007) https://doi.org/10.1117/12.725874

KEYWORDS: Wavefronts, Wavefront sensors, Phase retrieval, Sensors, Speckle, Wave propagation, Reconstruction algorithms, CCD cameras, Holography, Refractive index

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Proceedings Article | 15 September 2006 Paper

Wave front phase and amplitude reconstruction techniques using multiple intensity patterns

Percival Almoro, Giancarlo Pedrini, Wolfgang Osten

Proceedings Volume 6341, 63411C (2006) https://doi.org/10.1117/12.695363

KEYWORDS: Distance measurement, Wavefronts, Speckle, Wave propagation, Speckle pattern, Cameras, Computer simulations, Image quality, Image enhancement, Charge-coupled devices

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Showing 5 of 14 publications

Conference Committee Involvement (1)

Third International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2018)

3 August 2018 | Surabaya, Indonesia

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