Prof. Paul L. O'Leary Profile

Prof. Paul L. O'Leary

Head of the Institute at Montan Univ Leoben

SPIE Involvement:

Author

Publications (34)

Proceedings Article | 30 April 2015 Paper

MATLAB toolbox for the regularized surface reconstruction from gradients

Matthew Harker, Paul O'Leary

Proceedings Volume 9534, 95341E (2015) https://doi.org/10.1117/12.2182827

KEYWORDS: Reconstruction algorithms, MATLAB, Matrices, Inverse problems, Numerical analysis, Pollution control, Machine vision, Current controlled current source, Algorithm development, Dysprosium

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Proceedings Article | 6 March 2013 Paper

Structural deformation measurement via efficient tensor polynomial calibrated electro-active glass targets

Christoph Gugg, Matthew Harker, Paul O'Leary

Proceedings Volume 8661, 86610F (2013) https://doi.org/10.1117/12.2003679

KEYWORDS: Calibration, Glasses, Distortion, Cameras, Lenses, Opacity, Measurement devices, Matrices, Mathematical modeling, Electroluminescent displays

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This paper describes the physical setup and mathematical modelling of a device for the measurement of structural deformations over large scales, e.g., a mining shaft. Image processing techniques are used to determine the deformation by measuring the position of a target relative to a reference laser beam. A particular novelty is the incorporation of electro-active glass; the polymer dispersion liquid crystal shutters enable the simultaneous calibration of any number of consecutive measurement units without manual intervention, i.e., the process is fully automatic. It is necessary to compensate for optical distortion if high accuracy is to be achieved in a compact hardware design where lenses with short focal lengths are used. Wide-angle lenses exhibit significant distortion, which are typically characterized using Zernike polynomials. Radial distortion models assume that the lens is rotationally symmetric; such models are insufficient in the application at hand. This paper presents a new coordinate mapping procedure based on a tensor product of discrete orthogonal polynomials. Both lens distortion and the projection are compensated by a single linear transformation. Once calibrated, to acquire the measurement data, it is necessary to localize a single laser spot in the image. For this purpose, complete interpolation and rectification of the image is not required; hence, we have developed a new hierarchical approach based on a quad-tree subdivision. Cross-validation tests verify the validity, demonstrating that the proposed method accurately models both the optical distortion as well as the projection. The achievable accuracy is e ≤ ±0.01 [mm] in a field of view of 150 [mm] x 150 [mm] at a distance of the laser source of 120 [m]. Finally, a Kolmogorov Smirnov test shows that the error distribution in localizing a laser spot is Gaussian. Consequently, due to the linearity of the proposed method, this also applies for the algorithm's output. Therefore, first-order covariance propagation provides an accurate estimate of the measurement uncertainty, which is essential for any measurement device.

Proceedings Article | 6 March 2013 Paper

Machine vision system for the control of tunnel boring machines

Michael Habacher, Paul O'Leary, Matthew Harker, Johannes Golser

Proceedings Volume 8661, 86610G (2013) https://doi.org/10.1117/12.2003847

KEYWORDS: Control systems, Cameras, Machine vision, Imaging systems, Light emitting diodes, Detection and tracking algorithms, Image quality, Binary data, Image processing, Dysprosium

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SPIE Journal Paper | 7 May 2012

Fusion of geometric and thermographic data for automated defect detection

Beata Oswald-Tranta, Paul O'Leary

JEI, Vol. 21, Issue 2, 021108, (May 2012) https://doi.org/10.1117/12.10.1117/1.JEI.21.2.021108

KEYWORDS: Thermography, Image fusion, Inspection, 3D image processing, Infrared cameras, Infrared imaging, Infrared radiation, Data fusion, Image registration, Cameras

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Proceedings Article | 2 February 2012 Paper

Strain analysis by regularized non-rigid registration

Amir Badshah, Paul O'Leary, Matthew Harker, Daniel Tscharnuter

Proceedings Volume 8300, 83000D (2012) https://doi.org/10.1117/12.920003

KEYWORDS: Image registration, Strain analysis, Stochastic processes, Composites, Coating, Distortion, Image compression, Optical testing, Stress analysis, Astatine

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Proceedings Article | 12 July 2011 Paper

Non-rigid registration for qualitiy control of printed materials

Amir Badshah, Paul O'Leary, Matthew Harker, Christian Sallinger

Proceedings Volume 8000, 80000J (2011) https://doi.org/10.1117/12.890901

KEYWORDS: Image registration, Image filtering, Partial differential equations, Data acquisition, MATLAB, Linear filtering, Matrices, Automatic control, Error analysis, Image restoration

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Proceedings Article | 12 July 2011 Paper

Fusion of geometric and thermographic data for the automatic inspection of forgings and castings

Beate Oswald-Tranta, Paul O'Leary

Proceedings Volume 8000, 80000G (2011) https://doi.org/10.1117/12.891054

KEYWORDS: Inspection, Thermography, 3D metrology, Image registration, 3D image processing, Infrared imaging, Infrared radiation, Infrared cameras, Cameras, Data fusion

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Proceedings Article | 7 February 2011 Paper

Gram polynomial image decimation and its application to non-rigid registration

Amir Badshah, Paul O'Leary, Matthew Harker

Proceedings Volume 7877, 787707 (2011) https://doi.org/10.1117/12.876665

KEYWORDS: Image registration, Signal to noise ratio, Image restoration, Distortion, Smoothing, Biomedical optics, Feature extraction, Gaussian filters, Image processing, Clouds

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SPIE Journal Paper | 1 July 2010

Discrete polynomial moments and the extraction of 3-D embossed digits for recognition

Paul O'Leary, Matthew Harker, Bernhard Mörtl

JEI, Vol. 19, Issue 3, 031205, (July 2010) https://doi.org/10.1117/12.10.1117/1.3455988

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SPIE Journal Paper | 1 July 2010

Thermographic crack detection and failure classification

Beate Oswald-Tranta, Mario Sorger, Paul O'Leary

JEI, Vol. 19, Issue 3, 031204, (July 2010) https://doi.org/10.1117/12.10.1117/1.3455991

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SPIE Journal Paper | 1 January 2009

Discrete polynomial moments for real-time geometric surface inspection

Paul O'Leary, Matthew Harker

JEI, Vol. 18, Issue 01, 013015, (January 2009) https://doi.org/10.1117/12.10.1117/1.2987725

KEYWORDS: Inspection, Condition numbers, Error analysis, Copper, Data modeling, Matrices, Data acquisition, Stochastic processes, Visual process modeling, Image processing

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Proceedings Article | 26 February 2008 Paper

Methods of statistical uncertainty analysis applied to evaluation algorithms of a video-extensometer system

Ewald Fauster, Paul O'Leary

Proceedings Volume 6813, 68130O (2008) https://doi.org/10.1117/12.766273

KEYWORDS: Error analysis, Statistical analysis, Uncertainty analysis, Data acquisition, Cameras, Image processing, Data modeling, Dysprosium, Matrices, Statistical methods

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Proceedings Article | 9 February 2006 Paper

Optical servoing for industrial surface machining

Norbert Koller, Ronald Ofner, Paul O'Leary, Ewald Fauster

Proceedings Volume 6070, 607001 (2006) https://doi.org/10.1117/12.642718

KEYWORDS: RGB color model, Cameras, Image processing, Calibration, 3D modeling, Control systems, Scanners, 3D image processing, Imaging systems, Image segmentation

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Proceedings Article | 11 March 2005 Paper

Incremental matrix orthogonalization with an application to curve fitting

Matthew Harker, Paul O'Leary, Paul Zsombor-Murray

Proceedings Volume 5674, (2005) https://doi.org/10.1117/12.586499

KEYWORDS: Tolerancing, Space operations, Matrices, Quality measurement, Computational imaging, Electronic imaging, Silicon, Condition numbers, Clouds, Numerical stability

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Proceedings Article | 24 February 2005 Paper

Positional and orientational referencing of multiple light sectioning systems for precision profile measurement

Mark Tratnig, Helmut Hlobil, Johann Reisinger, Paul O'Leary

Proceedings Volume 5679, (2005) https://doi.org/10.1117/12.586501

KEYWORDS: Head, Inspection, Calibration, Cameras, Manufacturing, Glasses, Precision measurement, Laser systems engineering, Target acquisition, Microscopes

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Proceedings Article | 24 February 2005 Paper

Evaluation and calibration methods for the application of a video-extensometer to tensile testing of polymer materials

Ewald Fauster, Peter Schalk, Paul O'Leary

Proceedings Volume 5679, (2005) https://doi.org/10.1117/12.586734

KEYWORDS: Calibration, Cameras, Imaging systems, Polymers, Image processing, Matrices, 3D image processing, Standards development, Visualization, Detection and tracking algorithms

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Proceedings Article | 24 February 2005 Paper

High-temperature video-extensometry for material testing of refractories

Peter Schalk, Ewald Fauster, Paul O'Leary

Proceedings Volume 5679, (2005) https://doi.org/10.1117/12.586737

KEYWORDS: Temperature metrology, Cameras, Turbulence, Image processing, Video, CCD cameras, Image acquisition, Edge detection, Quartz, Glasses

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SPIE Journal Paper | 1 July 2004

Direct and specific least-square fitting of hyperbolæ and ellipses

Paul O'Leary, Paul Zsombor-Murray

JEI, Vol. 13, Issue 03, (July 2004) https://doi.org/10.1117/12.10.1117/1.1758951

KEYWORDS: Inspection, Scanning probe lithography, MATLAB, Numerical stability, Matrices, Data modeling, Image processing, Numerical simulations, Distance measurement, Statistical analysis

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SPIE Journal Paper | 1 July 2004

Framework for automatic quality control in industrial environments using distributed image processing

Peter Schalk, Ewald Fauster, Paul O'Leary, Michael Weiss

JEI, Vol. 13, Issue 03, (July 2004) https://doi.org/10.1117/12.10.1117/1.1762519

KEYWORDS: Image processing, Telecommunications, Data communications, Distributed computing, Sensors, Cameras, Automatic control, Control systems, Imaging systems, Image quality

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Proceedings Article | 3 May 2004 Paper

Real-time stereo for industrial inspection

Bernhard Buchner, Paul O'Leary

Proceedings Volume 5303, (2004) https://doi.org/10.1117/12.524992

KEYWORDS: Image segmentation, Inspection, Image registration, Cameras, Image processing, Prototyping, 3D metrology, 3D image processing, Calibration, Hough transforms

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Proceedings Article | 3 May 2004 Paper

Comparison of CMOS and CCD cameras for laser profiling

Norbert Koller, Paul O'Leary, Peter Lee

Proceedings Volume 5303, (2004) https://doi.org/10.1117/12.529868

KEYWORDS: CCD cameras, Cameras, Profiling, Laser applications, High dynamic range imaging, Interference filters, Light sources, CMOS technology, Standards development, Signal to noise ratio

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Proceedings Article | 3 May 2004 Paper

Panoramic optical-servoing for industrial inspection and repair

Christian Sallinger, Paul O'Leary, Alexander Retschnig, Martin Kammerhofer

Proceedings Volume 5303, (2004) https://doi.org/10.1117/12.526349

KEYWORDS: Panoramic photography, Robots, Inspection, Temperature metrology, Image processing, Image acquisition, Cameras, Optical inspection, Distortion, Fourier transforms

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Proceedings Article | 3 May 2004 Paper

Camera calibration, data segmentation, and fitting approaches for a visual edge inspection system

Mark Tratnig, Paul O'Leary, Helmut Hlobil, Johann Reisinger

Proceedings Volume 5303, (2004) https://doi.org/10.1117/12.525013

KEYWORDS: Calibration, Inspection, Cameras, Head, Laser systems engineering, Optical inspection, Image segmentation, Fluorescence correlation spectroscopy, Visualization, Imaging systems

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Proceedings Article | 22 May 2003 Paper

Calibration verification of a mining machine using image processing

Ronald Ofner, Gerhard Rath, Paul O'Leary

Proceedings Volume 5011, (2003) https://doi.org/10.1117/12.473967

KEYWORDS: Calibration, Mining, Image processing, Cameras, Kinematics, Control systems, Head, Near infrared, Light emitting diodes, Optical filters

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Proceedings Article | 22 May 2003 Paper

Distributed image processing system for the monitoring of hot steel wire

Paul O'Leary, Michael Weiss, Arnulf Schiller

Proceedings Volume 5011, (2003) https://doi.org/10.1117/12.473965

KEYWORDS: Image processing, Telecommunications, Distributed computing, Cameras, Prototyping, Data processing, Imaging systems, Standards development, Java, Internet

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Proceedings Article | 22 May 2003 Paper

Shape description and analysis of range data for milled steel blocks

Franz Pernkopf, Paul O'Leary

Proceedings Volume 5011, (2003) https://doi.org/10.1117/12.474029

KEYWORDS: Shape analysis, Data modeling, Reflection, Data acquisition, Range imaging, Convolution, 3D image processing, Surface properties, Inspection, Image segmentation

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Proceedings Article | 1 May 2003 Paper

Search-and-score structure learning algorithm for Bayesian network classifiers

Franz Pernkopf, Paul O'Leary

Proceedings Volume 5132, (2003) https://doi.org/10.1117/12.515041

KEYWORDS: Feature selection, Argon, Error analysis, Data analysis, Heart, Feature extraction, Statistical analysis, Statistical modeling, Fourier transforms, Glasses

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Proceedings Article | 1 May 2003 Paper

Development of a distributed vision system for industrial conditions

Michael Weiss, Arnulf Schiller, Paul O'Leary, Ewald Fauster, Peter Schalk

Proceedings Volume 5132, (2003) https://doi.org/10.1117/12.514944

KEYWORDS: Telecommunications, Computing systems, Distributed computing, Image processing, Sensors, Network security, Prototyping, Machine vision, Environmental sensing, Computer programming

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Proceedings Article | 8 March 2002 Paper

Fitting geometric models in image processing using Grassmann manifolds

Paul O'Leary

Proceedings Volume 4664, (2002) https://doi.org/10.1117/12.460198

KEYWORDS: Image processing, Data modeling, 3D image processing, Matrices, Systems modeling, Doppler effect, Sensors, 3D modeling, Machine vision, Inspection

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Proceedings Article | 8 March 2002 Paper

Detection of surface defects on raw milled steel blocks using range imaging

Franz Pernkopf, Friedrich Pernkopf, Paul O'Leary

Proceedings Volume 4664, (2002) https://doi.org/10.1117/12.460195

KEYWORDS: Defect detection, Range imaging, Detection and tracking algorithms, Reconstruction algorithms, Data modeling, Inspection, 3D modeling, Data acquisition, 3D image processing, Reflection

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Proceedings Article | 23 March 2001 Paper

Simulations and analytical models for optimization of photothermal surface crack detection

Robin Steinberger, Thomas Gruenberger, Paul O'Leary

Proceedings Volume 4360, (2001) https://doi.org/10.1117/12.421037

KEYWORDS: Heat flux, Thermal modeling, Optimization (mathematics), Chemical elements, Temperature metrology, Thermography, Cameras, Finite element methods, Analytical research, Ultrasonics

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Proceedings Article | 19 December 1996 Paper

MInOSS project

Alvise Sartori, M. Gottardi, P. Lee, F. Maloberti, Paul O'Leary, A. Simoni, Guido Torelli

Proceedings Volume 2950, (1996) https://doi.org/10.1117/12.262539

KEYWORDS: Amplifiers, Photodiodes, Sensors, Capacitors, Intelligent sensors, Capacitance, Charge-coupled devices, Optical sensors, Transistors, CMOS technology

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Proceedings Article | 8 May 1995 Paper

Detection of fluorescence lifetime based on solid state technology and its application to optical oxygen sensing

Wolfgang Gruber, Paul O'Leary, Otto Wolfbeis

Proceedings Volume 2388, (1995) https://doi.org/10.1117/12.208474

KEYWORDS: Sensors, Amplifiers, Heterodyning, Luminescence, Capacitance, Demodulation, Interference (communication), Oxygen, Fluorescence spectroscopy, Signal detection

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