Dr. Christina Grönwall Profile

Dr. Christina Grönwall

Senior Scientist at FOI-Swedish Defence Research Agency

SPIE Involvement:

Author

Publications (32)

SPIE Journal Paper | 13 February 2018 Open Access

Peak detection approaches for time-correlated single-photon counting three-dimensional lidar systems

Gustav Tolt, Christina Grönwall, Markus Henriksson

OE, Vol. 57, Issue 03, 031306, (February 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.3.031306

KEYWORDS: Single photon detectors, LIDAR, Sensors, Detection and tracking algorithms, Expectation maximization algorithms, Signal detection, Target detection, Signal to noise ratio, Optical engineering, Signal processing

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Proceedings Article | 5 October 2017 Paper

Open architecture of smart sensor suites

Wilmuth Müller, Achim Kuwertz, Christina Grönwall, Henrik Petersson, Rob Dekker, Frank Reinert, Maarten Ditzel

Proceedings Volume 10434, 104340Q (2017) https://doi.org/10.1117/12.2278517

KEYWORDS: Sensors, Smart sensors, Sensor networks, Surveillance, Optical sensors, Databases, Reconnaissance, Target recognition, Situational awareness sensors, C4ISR

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SPIE Journal Paper | 27 September 2016

Continuously scanning time-correlated single-photon-counting single-pixel 3-D lidar

Markus Henriksson, Håkan Larsson, Christina Grönwall, Gustav Tolt

OE, Vol. 56, Issue 03, 031204, (September 2016) https://doi.org/10.1117/12.10.1117/1.OE.56.3.031204

KEYWORDS: Sensors, LIDAR, Pulsed laser operation, 3D acquisition, Clouds, Vegetation, Signal processing, Detector arrays, Distance measurement, Eye

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Proceedings Article | 13 May 2016 Paper

Application and capabilities of lidar from small UAV

Michael Tulldahl, Håkan Larsson, Gustav Tolt, Fredrik Bissmarck, Christina Grönwall, Jonas Nordlöf

Proceedings Volume 9832, 98320V (2016) https://doi.org/10.1117/12.2224258

KEYWORDS: LIDAR, Unmanned aerial vehicles, Clouds, 3D acquisition, 3D image processing, Target detection, Target recognition, Roads, 3D metrology, Vegetation

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Proceedings Article | 16 October 2015 Paper

3D sensing and imaging for UAVs

Christina Grönwall, Gustav Tolt, Patrik Lif, Håkan Larsson, Fredrik Bissmarck, Michael Tulldahl, Markus Henriksson, Per Wikberg, Mirko Thorstensson

Proceedings Volume 9649, 96490C (2015) https://doi.org/10.1117/12.2192834

KEYWORDS: Unmanned aerial vehicles, Sensors, LIDAR, 3D modeling, 3D acquisition, Visualization, Target detection, Clouds, Signal processing, Data modeling

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Proceedings Article | 16 October 2015 Paper

Accuracy evaluation of 3D lidar data from small UAV

H. Tulldahl, Fredrik Bissmarck, Håkan Larsson, Christina Grönwall, Gustav Tolt

Proceedings Volume 9649, 964903 (2015) https://doi.org/10.1117/12.2194508

KEYWORDS: LIDAR, Calibration, Unmanned aerial vehicles, Clouds, Sensors, Microelectromechanical systems, Data processing, Neodymium, Ions, Data modeling

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Proceedings Article | 13 October 2015 Paper

Experiences from long range passive and active imaging

Christina Grönwall, David Gustafsson, Ove Steinvall, Gustav Tolt

Proceedings Volume 9649, 96490J (2015) https://doi.org/10.1117/12.2196278

KEYWORDS: Target detection, Optical flow, Sensors, Turbulence, Target recognition, 3D acquisition, Cameras, Mid-IR, Profiling, Computer aided design

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Proceedings Article | 13 October 2015 Paper

A proposal for combining mapping, localization and target recognition

Christina Grönwall, Gustaf Hendeby, Kristian Sinivaara

Proceedings Volume 9649, 96490G (2015) https://doi.org/10.1117/12.2192200

KEYWORDS: Automatic target recognition, Sensors, 3D modeling, Target detection, Detection and tracking algorithms, Target recognition, Laser scanners, Environmental sensing, Clouds, Buildings

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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 | 15 October 2013 Paper

Measurements and analysis of active/passive multispectral imaging

Christina Grönwall, Dominique Hamoir, Ove Steinvall, Håkan Larsson, Elias Amselem, Peter Lutzmann, Endre Repasi, Benjamin Göhler, Stéphane Barbé, Olivier Vaudelin, Michel Fracès, Bernard Tanguy, Emmanuelle Thouin

Proceedings Volume 8897, 889705 (2013) https://doi.org/10.1117/12.2028647

KEYWORDS: Sensors, Near infrared, Reflectivity, Short wave infrared radiation, Multispectral imaging, Turbulence, Long wavelength infrared, Transmission electron microscopy, Visualization, Target recognition

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Proceedings Article | 15 October 2013 Paper

Future electro-optical sensors and processing in urban operations

Christina Grönwall, Piet Schwering, Jouni Rantakokko, Koen Benoist, Rob A. Kemp, Ove Steinvall, Dietmar Letalick, Stefan Björkert

Proceedings Volume 8897, 889702 (2013) https://doi.org/10.1117/12.2030412

KEYWORDS: Sensors, Signal processing, Data communications, Image processing, Data processing, Telecommunications, Data fusion, Infrared sensors, 3D image processing, Unmanned aerial vehicles

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In the electro-optical sensors and processing in urban operations (ESUO) study we pave the way for the European Defence Agency (EDA) group of Electro-Optics experts (IAP03) for a common understanding of the optimal distribution of processing functions between the different platforms. Combinations of local, distributed and centralized processing are proposed. In this way one can match processing functionality to the required power, and available communication systems data rates, to obtain the desired reaction times. In the study, three priority scenarios were defined. For these scenarios, present-day and future sensors and signal processing technologies were studied. The priority scenarios were camp protection, patrol and house search. A method for analyzing information quality in single and multi-sensor systems has been applied. A method for estimating reaction times for transmission of data through the chain of command has been proposed and used. These methods are documented and can be used to modify scenarios, or be applied to other scenarios. Present day data processing is organized mainly locally. Very limited exchange of information with other platforms is present; this is performed mainly at a high information level. Main issues that arose from the analysis of present-day systems and methodology are the slow reaction time due to the limited field of view of present-day sensors and the lack of robust automated processing. Efficient handover schemes between wide and narrow field of view sensors may however reduce the delay times. The main effort in the study was in forecasting the signal processing of EO-sensors in the next ten to twenty years. Distributed processing is proposed between hand-held and vehicle based sensors. This can be accompanied by cloud processing on board several vehicles. Additionally, to perform sensor fusion on sensor data originating from different platforms, and making full use of UAV imagery, a combination of distributed and centralized processing is essential. There is a central role for sensor fusion of heterogeneous sensors in future processing. The changes that occur in the urban operations of the future due to the application of these new technologies will be the improved quality of information, with shorter reaction time, and with lower operator load.

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

Optical reflectance tomography using TCSPC laser radar

Markus Henriksson, Tomas Olofsson, Christina Grönwall, Carl Brännlund, Lars Sjöqvist

Proceedings Volume 8542, 85420E (2012) https://doi.org/10.1117/12.974493

KEYWORDS: Tomography, Sensors, LIDAR, Satellites, Reflectivity, Laser systems engineering, Picosecond phenomena, Photons, Receivers, Unmanned aerial vehicles

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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 | 5 October 2011 Paper

Signal processing for imaging and mapping ladar

Christina Grönwall, Gustav Tolt

Proceedings Volume 8186, 818607 (2011) https://doi.org/10.1117/12.901799

KEYWORDS: Sensors, Cameras, Target detection, LIDAR, Reflectivity, Image segmentation, Signal processing, Clouds, 3D acquisition, Image sensors

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Proceedings Article | 3 June 2011 Paper

Submap joining smoothing and mapping for camera-based indoor localization and mapping

J. Bjärkefur, A. Karlsson, C. Grönwall, J. Rydell

Proceedings Volume 8056, 805609 (2011) https://doi.org/10.1117/12.883945

KEYWORDS: Sensors, Cameras, Process modeling, Imaging systems, Error analysis, Safety, Lithium, Environmental sensing, Telecommunications, RF communications

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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 | 13 May 2010 Paper

Threat detection and tracking using 3D FLASH ladar data

Christina Grönwall, Gustav Tolt, Daniel Karlsson, Hadi Esteki, Joakim Rydell, Ernest Armstrong, Jack Woods

Proceedings Volume 7696, 76960N (2010) https://doi.org/10.1117/12.849973

KEYWORDS: Target detection, Image segmentation, Sensors, 3D acquisition, LIDAR, 3D metrology, Head, Cameras, Data modeling, Imaging systems

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Proceedings Article | 2 October 2008 Paper

Atmospheric turbulence effects in single-photon counting time-of-flight range profiling

Lars Sjöqvist, Christina Grönwall, Markus Henriksson, Per Jonsson, Ove Steinvall

Proceedings Volume 7115, 71150G (2008) https://doi.org/10.1117/12.800241

KEYWORDS: Turbulence, Profiling, Surface plasmons, Atmospheric turbulence, Scintillation, Picosecond phenomena, Photon counting, LIDAR, Target detection, Atmospheric propagation

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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 | 26 April 2007 Paper

Assessments of phenomenologies for multi-optical mine detection

Dietmar Letalick, Stefan Sjökvist, Magnus Uppsäll, Dennis Menning, Pierre Andersson, Christina Grönwall

Proceedings Volume 6553, 65530X (2007) https://doi.org/10.1117/12.719923

KEYWORDS: Sensors, Land mines, Mining, Roads, Vegetation, Signal processing, Long wavelength infrared, Sun, Polarization, Luminescence

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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 | 16 May 2006 Paper

Multi-optical mine detection: results from a field trial

Dietmar Letalick, Gustav Tolt, Stefan Sjökvist, Sten Nyberg, Christina Grönwall, Pierre Andersson, Anna Linderhed, Göran Forssell, Håkan Larsson, Magnus Uppsäll

Proceedings Volume 6217, 62170D (2006) https://doi.org/10.1117/12.665517

KEYWORDS: Sensors, Reflectivity, Land mines, LIDAR, Polarization, Target detection, Cameras, Mining, Optical filters, Optical sensors

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Proceedings Article | 18 April 2006 Paper

A fusion approach for coarse-to-fine target recognition

Martin Folkesson, Christina Grönwall, Erland Jungert

Proceedings Volume 6242, 62420H (2006) https://doi.org/10.1117/12.661133

KEYWORDS: Sensors, Detection and tracking algorithms, 3D modeling, Prototyping, Target recognition, Data modeling, Data fusion, Long wavelength infrared, Target detection, 3D acquisition

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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 | 12 April 2004 Paper

An information system for target recognition

Tobias Horney, Jorgen Ahlberg, Christina Gronwall, Martin Folkesson, Karin Silvervarg, Jorgen Fransson, Lena Klasen, Erland Jungert, Fredrik Lantz, Morgan Ulvklo

Proceedings Volume 5434, (2004) https://doi.org/10.1117/12.540968

KEYWORDS: Sensors, Target recognition, Human-machine interfaces, Data fusion, Visualization, Target detection, Telecommunications, Algorithm development, Decision support systems, Automatic target recognition

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Proceedings Article | 22 October 2001 Paper

Vehicle size and orientation estimation using geometric fitting

Christina Groenwall, Mille Millnert

Proceedings Volume 4379, (2001) https://doi.org/10.1117/12.445401

KEYWORDS: LIDAR, Laser systems engineering, Imaging systems, Object recognition, Error analysis, Radon, Radar imaging, 3D modeling, Data modeling, Data analysis

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Proceedings Article | 28 May 1999 Paper

Gated viewing for target detection and target recognition

Ove Steinvall, Hakan Olsson, Goeran Bolander, Christina Groenwall, Dietmar Letalick

Proceedings Volume 3707, (1999) https://doi.org/10.1117/12.351364

KEYWORDS: Target detection, Clouds, Target recognition, Pulsed laser operation, Cameras, Machine vision, Computer vision technology, Image processing, Reflectivity, Sensors

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Proceedings Article | 18 September 1998 Paper

Qualitative matching technique for handling uncertainties in laser radar data images

Erland Jungert, Christina Groenwall, Claes Leuhusen

Proceedings Volume 3371, (1998) https://doi.org/10.1117/12.323878

KEYWORDS: LIDAR, Image segmentation, 3D image processing, Library classification systems, Image classification, Laser systems engineering, Spatial resolution, Target detection, Databases, Feature extraction

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Showing 5 of 32 publications

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