Dr. Tomas R. Chevalier Profile

Dr. Tomas R. Chevalier

CTO / Laser Sensor Specialist at Scienvisic AB

SPIE Involvement:

Author

Area of Expertise:

Remote Sensing , Signal processing , Gated Viewing , 3D , Laser radar

Publications (28)

Proceedings Article | 5 May 2017 Presentation + Paper

Three-dimensional hyperspectral imaging technique

Jörgen Ahlberg, Ingmar Renhorn, Tomas Chevalier, Joakim Rydell, David Bergström

Proceedings Volume 10198, 1019805 (2017) https://doi.org/10.1117/12.2262456

KEYWORDS: Staring arrays, Data acquisition, 3D image reconstruction, 3D modeling, Cameras, Sensors, Hyperspectral imaging, Optical filters, Linear filtering, Remote sensing, 3D image processing

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SPIE Journal Paper | 21 February 2014 Open Access

Errata: Simulation and modeling of laser range profiling and imaging of small surface vessels

Ove Steinvall, Tomas Chevalier, Christina Grönwall

OE, Vol. 53, Issue 02, 029801, (February 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.2.029801

KEYWORDS: Optical simulations, Electro optical modeling, Profiling, Range imaging, Defense and security, Systems modeling, Imaging systems, Electro optical systems, Optical engineering

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SPIE Journal Paper | 3 February 2014 Open Access

Simulation and modeling of laser range profiling and imaging of small surface vessels

Ove Steinvall, Tomas Chevalier, Christina Grönwall

OE, Vol. 53, Issue 01, 013109, (February 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.1.013109

KEYWORDS: Profiling, Optical simulations, 3D modeling, Sensors, Data modeling, Range imaging, 3D acquisition, Signal to noise ratio, Solid modeling, Target detection

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Proceedings Article | 28 May 2013 Paper

Simulating the performance of laser imaging and range profiling of small surface vessels

Ove Steinvall, Tomas Chevalier, Christina Grönwall

Proceedings Volume 8731, 87310U (2013) https://doi.org/10.1117/12.2015109

KEYWORDS: Solid modeling, Computer aided design, Sensors, Data modeling, Target detection, 3D modeling, Turbulence, Profiling, Optical simulations, 3D acquisition

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Proceedings Article | 19 November 2012 Paper

Identification of handheld objects and human activities in active and passive imaging

Ove Steinvall, Magnus Elmqvist, Tomas Chevalier

Proceedings Volume 8542, 854206 (2012) https://doi.org/10.1117/12.976034

KEYWORDS: Turbulence, Sensors, Target recognition, Firearms, Long wavelength infrared, Short wave infrared radiation, Infrared imaging, Cameras, Imaging systems, Video

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Proceedings Article | 19 November 2012 Paper

Measurement and modeling of laser range profiling of small maritime targets

Ove Steinvall, Magnus Elmqvist, Tomas Chevalier, Carl Brännlund

Proceedings Volume 8542, 85420I (2012) https://doi.org/10.1117/12.970271

KEYWORDS: Sensors, Profiling, Target detection, LIDAR, Signal to noise ratio, Reflectivity, Radar, Systems modeling, Laser range finders, 3D modeling

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Proceedings Article | 26 May 2012 Paper

Slant path range gated imaging of static and moving targets

Ove Steinvall, Magnus Elmqvist, Kjell Karlsson, Ove Gustafsson, Tomas Chevalier

Proceedings Volume 8379, 83790W (2012) https://doi.org/10.1117/12.919101

KEYWORDS: Turbulence, Sensors, Spatial resolution, Image resolution, Target recognition, Cameras, Imaging systems, Gated imaging, Speckle, Video

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Proceedings Article | 14 May 2012 Paper

Applications of 3D occupancy grids in a target analysis context

Gustav Tolt, Tomas Chevalier, Philip Engström, Christina Grönwall

Proceedings Volume 8379, 83790D (2012) https://doi.org/10.1117/12.919103

KEYWORDS: Sensors, 3D modeling, 3D acquisition, Image registration, Data modeling, 3D metrology, Clouds, Image segmentation, Reflection, 3D applications

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Proceedings Article | 10 May 2011 Paper

Slant path 1.5 µm range gated imaging close to ground

Ove Steinvall, Magnus Elmqvist, Kjell Karlsson, Ove Gustafsson, Tomas Chevalier

Proceedings Volume 8037, 803703 (2011) https://doi.org/10.1117/12.883364

KEYWORDS: Turbulence, Spatial resolution, Sensors, Speckle, Image resolution, Receivers, Gated imaging, Image quality, Temperature metrology, Cameras

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SPIE Journal Paper | 1 April 2011

Spatial filtering for detection of partly occluded targets

Christina Grönwall, Gustav Tolt, Tomas Chevalier, Håkan Larsson

OE, Vol. 50, Issue 04, 047201, (April 2011) https://doi.org/10.1117/12.10.1117/1.3560262

KEYWORDS: Target detection, Sensors, Spatial filters, Target recognition, Image segmentation, Feature extraction, LIDAR, Detection and tracking algorithms, Optical engineering, Data modeling

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Proceedings Article | 1 October 2009 Paper

Laser radar modeling for simulation and performance evaluation

Tomas Chevalier, Ove Steinvall

Proceedings Volume 7482, 748206 (2009) https://doi.org/10.1117/12.830467

KEYWORDS: LIDAR, Sensors, 3D modeling, Data modeling, Optical simulations, Atmospheric modeling, Computer simulations, Systems modeling, Turbulence, Electro optical modeling

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Proceedings Article | 16 April 2008 Paper

An approach to target detection in forested scenes

Christina Grönwall, Tomas Chevalier, Gustav Tolt, Pierre Andersson

Proceedings Volume 6950, 69500S (2008) https://doi.org/10.1117/12.777042

KEYWORDS: Target detection, Target recognition, Image segmentation, Sensors, Data modeling, Detection and tracking algorithms, Automatic target recognition, LIDAR, 3D acquisition, Statistical analysis

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SPIE Journal Paper | 1 October 2007

Influence of laser radar sensor parameters on range-measurement and shape-fitting uncertainties

Christina Grönwall, Ove Steinvall, Fredrik Gustafsson, Tomas Chevalier

OE, Vol. 46, Issue 10, 106201, (October 2007) https://doi.org/10.1117/12.10.1117/1.2789654

KEYWORDS: LIDAR, Signal to noise ratio, Sensors, Optical spheres, Error analysis, Laser systems engineering, Optical filters, Statistical analysis, Optical engineering, Detection and tracking algorithms

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Proceedings Article | 12 June 2007 Paper

Performance modeling and simulation of range-gated imaging systems

Ove Steinvall, Tomas Chevalier, Pierre Andersson, Magnus Elmqvist

Proceedings Volume 6542, 654218 (2007) https://doi.org/10.1117/12.718575

KEYWORDS: Speckle, Turbulence, Modulation transfer functions, Signal to noise ratio, Imaging systems, Image quality, Sensors, 3D modeling, Scintillation, 3D image reconstruction

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Proceedings Article | 4 May 2007 Paper

Performance of laser penetration through forest vegetation

Tomas Chevalier, Ove Steinvall, Håkan Larsson

Proceedings Volume 6550, 65500Q (2007) https://doi.org/10.1117/12.717722

KEYWORDS: Vegetation, Sensors, LIDAR, Laser scanners, 3D acquisition, 3D image processing, Laser systems engineering, Optoelectronics, Clouds, Camouflage

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SPIE Journal Paper | 1 November 2006

Characterizing laser radar snow reflection for the wavelengths 0.9 and 1.5 μm

Håkan Larsson, Ove Steinvall, Tomas Chevalier, Frank Gustafsson

OE, Vol. 45, Issue 11, 116201, (November 2006) https://doi.org/10.1117/12.10.1117/1.2386026

KEYWORDS: Reflectivity, LIDAR, Reflection, Optical engineering, Clouds, Calibration, Bidirectional reflectance transmission function, Humidity, Laser scanners, Roads

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Proceedings Article | 5 October 2006 Paper

MOMS: multi-optical mine detection system: project overview

Anna Linderhed, Stefan Sjökvist, Ove Steinvall, Dietmar Letalick, Gustav Tolt, Tomas Chevalier, Sten Nyberg, Håkan Larsson, Magnus Uppsäll, Dennis Menning

Proceedings Volume 6395, 639503 (2006) https://doi.org/10.1117/12.690379

KEYWORDS: Land mines, Mining, Sensors, LIDAR, Vegetation, Luminescence, Thermography, Reflectivity, Target detection, Reflection

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Proceedings Article | 5 October 2006 Paper

Registration and change detection techniques using 3D laser radar data from natural environments

Gustav Tolt, Anders Wiklund, Pierre Andersson, Tomas Chevalier, Christina Grönwall, Frank Gustafsson, Håkan Larsson

Proceedings Volume 6396, 63960A (2006) https://doi.org/10.1117/12.690189

KEYWORDS: LIDAR, Data acquisition, Environmental sensing, Clouds, 3D acquisition, Sensors, Automatic target recognition, Image registration, Laser systems engineering, Defense and security

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Proceedings Article | 5 May 2006 Paper

Data collection and simulation of high range resolution laser radar for surface mine detection

Ove Steinvall, Tomas Chevalier, Håkan Larsson

Proceedings Volume 6214, 62140B (2006) https://doi.org/10.1117/12.665443

KEYWORDS: Mining, LIDAR, Land mines, Sensors, Deconvolution, Reflectivity, Clouds, Vegetation, Pulsed laser operation, Optical simulations

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Proceedings Article | 21 October 2005 Paper

Range accuracy and resolution for laser radars

Ove Steinvall, Tomas Chevalier

Proceedings Volume 5988, 598808 (2005) https://doi.org/10.1117/12.630622

KEYWORDS: Bidirectional reflectance transmission function, Pulsed laser operation, LIDAR, Signal to noise ratio, Sensors, Receivers, Optical simulations, Lead, Spatial resolution, Turbulence

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Proceedings Article | 1 June 2005 Paper

Performance of 3D laser radar through vegetation and camouflage

Ove Steinvall, Hakan Larsson, Frank Gustafsson, Dietmar Letalick, Tomas Chevalier, Asa Persson, Pierre Andersson

Proceedings Volume 5792, (2005) https://doi.org/10.1117/12.603546

KEYWORDS: LIDAR, Vegetation, Camouflage, 3D image processing, 3D acquisition, Visualization, Reflectivity, Stereoscopy, Pulsed laser operation, Clouds

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Proceedings Article | 19 May 2005 Paper

Characterizing laser radar snow reflection for the wavelengths 0.9 and 1.5 micrometer

Hakan Larsson, Ove Steinvall, Tomas Chevalier, Frank Gustafsson, Asa Persson, Pierre Andersson

Proceedings Volume 5791, (2005) https://doi.org/10.1117/12.603573

KEYWORDS: Reflectivity, LIDAR, Reflection, Bidirectional reflectance transmission function, Clouds, Laser scanners, Calibration, Eye, Humidity, Roads

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Proceedings Article | 8 December 2004 Paper

Characterizing targets and backgrounds for 3D laser radars

Ove Steinvall, Hakan Larsson, Frank Gustafsson, Tomas Chevalier, Asa Persson, Lena Klasen

Proceedings Volume 5613, (2004) https://doi.org/10.1117/12.578821

KEYWORDS: Target detection, LIDAR, Vegetation, Reflection, Reflectivity, Sensors, Staring arrays, Eye, Visualization, Associative arrays

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Proceedings Article | 13 September 2004 Paper

Aided target recognition from 3D laser radar data

Lena Klasen, Pierre Andersson, Hakan Larsson, Tomas Chevalier, Ove Steinvall

Proceedings Volume 5412, (2004) https://doi.org/10.1117/12.542434

KEYWORDS: 3D acquisition, Target recognition, LIDAR, Sensors, 3D image processing, 3D modeling, Laser systems engineering, Data modeling, Imaging systems, Clouds

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This paper presents our ongoing research activities on target recognition from data generated by 3-D imaging laser radar. In particular, we focus on future full flash imaging 3-D sensors. Several techniques for laser range imaging are applied for modelling and simulation of data from this kind of 3-D sensor systems. Firstly, data from an experimental gated viewing system is used. Processed data from this system is useful in assisting an operator in the target recognition task. Our recent work on target identification at long ranges, using range data from the gated viewing system, provides techniques to handle turbulence, platform motion and illumination variances from scintillation and speckle noise. Moreover, the range data is expanded into 3-D by using a gating technique that provides reconstruction of the target surface structure. This is shown at distances out to 7 km. Secondly, 3-D target data is achieved at short ranges by using different scanning laser radar systems. This provides high-resolution 3-D data from scanning a target from one single view. However, several scans from multiple viewing angles can also quite easily be merged for more detailed target representations. This is, for example, very useful for recognizing targets in vegetation. Hereby, we achieve simulated 3-D sensor data from both short and long ranges (100 meters out to 7 km) at various spatial resolutions. Thirdly, real data from the 3-D flash imaging system by US Air Force Research Lab (AFRL/SNJM), Wright Patterson Air Force Base, has recently been made available to FOI and also used as input in the development of aided target recognition methods. High-resolution 3-D target models are used in the identification process and compared to the 3-D target data (point cloud) from the various laser radar systems. Finally, we give some examples from our work that clearly show that future 3-D laser radar systems in cooperation with signal- and image analysis techniques have a great potential in the non-cooperative target recognition task and will provide several new and interesting capabilities, for example, to reveal targets hidden in vegetation.

Proceedings Article | 13 September 2004 Paper

Methods for recognition of natural and man-made objects using laser radar data

Christina Groenwall, Tomas Chevalier, Asa Persson, Magnus Elmqvist, Simon Ahlberg, Lena Klasen, Pierre Andersson

Proceedings Volume 5412, (2004) https://doi.org/10.1117/12.542055

KEYWORDS: Stereolithography, Lithium, LIDAR, Systems modeling, Reconstruction algorithms, Detection and tracking algorithms, Imaging systems, Laser systems engineering, 3D modeling, Data modeling

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Proceedings Article | 13 September 2004 Paper

3D laser sensing at FOI: overview and a system perspective

Ove Steinvall, Lena Klasen, Christina Gronwall, Ulf Soderman, Simon Ahlberg, Asa Persson, Magnus Elmqvist, Hakan Larsson, Dietmar Letalick, Pierre Andersson, Tomas Carlsson, Markus Henriksson

Proceedings Volume 5412, (2004) https://doi.org/10.1117/12.553808

KEYWORDS: Sensors, LIDAR, Target recognition, Target detection, 3D modeling, Staring arrays, Laser systems engineering, Weapons, Eye, Environmental sensing

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Proceedings Article | 21 August 2003 Paper

Target recognition by vibration frequency analysis: a comparison of laser vibrometry and acoustic methods

Dietmar Letalick, Tomas Carlsson, Hans Habberstad, Makus Henriksson

Proceedings Volume 5086, (2003) https://doi.org/10.1117/12.488508

KEYWORDS: Acoustics, Sensors, Vibrometry, Target recognition, Laser systems engineering, Telescopes, Head, Roads, Optical amplifiers, Signal processing

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Proceedings Article | 19 September 2001 Paper

Three-dimensional laser radar modeling

Ove Steinvall, Tomas Carlsson

Proceedings Volume 4377, (2001) https://doi.org/10.1117/12.440110

KEYWORDS: LIDAR, Bidirectional reflectance transmission function, 3D modeling, Computer simulations, Receivers, Optical simulations, Signal attenuation, Target detection, Modeling, Laser scattering

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Showing 5 of 28 publications

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