Dr. Christina Grönwall Profile

Dr. Christina Grönwall

Senior Scientist at FOI-Swedish Defence Research Agency

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Author

Publications (32)

SPIE Journal Paper | February 13, 2018

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

Tolt, Gustav , Grönwall, Christina , Henriksson, Markus

OE Vol. 57 Issue 03

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 | October 5, 2017

Open architecture of smart sensor suites

Proc. SPIE. 10434, Electro-Optical Remote Sensing XI

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

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SPIE Journal Paper | September 27, 2016

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

Henriksson, Markus , Larsson, Håkan , Grönwall, Christina , Tolt, Gustav

OE Vol. 56 Issue 03

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

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PROCEEDINGS ARTICLE | May 13, 2016

Application and capabilities of lidar from small UAV

Proc. SPIE. 9832, Laser Radar Technology and Applications XXI

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

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PROCEEDINGS ARTICLE | October 16, 2015

Accuracy evaluation of 3D lidar data from small UAV

Proc. SPIE. 9649, Electro-Optical Remote Sensing, Photonic Technologies, and Applications IX

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

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PROCEEDINGS ARTICLE | October 16, 2015

3D sensing and imaging for UAVs

Proc. SPIE. 9649, Electro-Optical Remote Sensing, Photonic Technologies, and Applications IX

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

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PROCEEDINGS ARTICLE | October 13, 2015

Experiences from long range passive and active imaging

Proc. SPIE. 9649, Electro-Optical Remote Sensing, Photonic Technologies, and Applications IX

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

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PROCEEDINGS ARTICLE | October 13, 2015

A proposal for combining mapping, localization and target recognition

Proc. SPIE. 9649, Electro-Optical Remote Sensing, Photonic Technologies, and Applications IX

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

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SPIE Journal Paper | February 21, 2014

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

Steinvall, Ove , Chevalier, Tomas , Grönwall, Christina

OE Vol. 53 Issue 02

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 | February 3, 2014

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

Steinvall, Ove , Chevalier, Tomas , Grönwall, Christina

OE Vol. 53 Issue 01

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 | October 15, 2013

Future electro-optical sensors and processing in urban operations

Proc. SPIE. 8897, Electro-Optical Remote Sensing, Photonic Technologies, and Applications VII; and Military Applications in Hyperspectral Imaging and High Spatial Resolution Sensing

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

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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 | October 15, 2013

Measurements and analysis of active/passive multispectral imaging

Proc. SPIE. 8897, Electro-Optical Remote Sensing, Photonic Technologies, and Applications VII; and Military Applications in Hyperspectral Imaging and High Spatial Resolution Sensing

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

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PROCEEDINGS ARTICLE | May 28, 2013

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

Proc. SPIE. 8731, Laser Radar Technology and Applications XVIII

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

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PROCEEDINGS ARTICLE | November 19, 2012

Optical reflectance tomography using TCSPC laser radar

Proc. SPIE. 8542, Electro-Optical Remote Sensing, Photonic Technologies, and Applications VI

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

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PROCEEDINGS ARTICLE | May 14, 2012

Applications of 3D occupancy grids in a target analysis context

Proc. SPIE. 8379, Laser Radar Technology and Applications XVII

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

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PROCEEDINGS ARTICLE | October 5, 2011

Signal processing for imaging and mapping ladar

Proc. SPIE. 8186, Electro-Optical Remote Sensing, Photonic Technologies, and Applications V

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

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PROCEEDINGS ARTICLE | June 3, 2011

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

Proc. SPIE. 8056, Visual Information Processing XX

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

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SPIE Journal Paper | April 1, 2011

Spatial filtering for detection of partly occluded targets

Grönwall, Christina , Tolt, Gustav , Chevalier, Tomas , Larsson, Håkan

OE Vol. 50 Issue 04

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 | May 13, 2010

Threat detection and tracking using 3D FLASH ladar data

Proc. SPIE. 7696, Automatic Target Recognition XX; Acquisition, Tracking, Pointing, and Laser Systems Technologies XXIV; and Optical Pattern Recognition XXI

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

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PROCEEDINGS ARTICLE | October 2, 2008

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

Proc. SPIE. 7115, Technologies for Optical Countermeasures V

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

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PROCEEDINGS ARTICLE | April 16, 2008

An approach to target detection in forested scenes

Proc. SPIE. 6950, Laser Radar Technology and Applications XIII

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

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SPIE Journal Paper | October 1, 2007

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

Grönwall, Christina , Steinvall, Ove , Gustafsson, Fredrik , Chevalier, Tomas

OE Vol. 46 Issue 10

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 | April 26, 2007

Assessments of phenomenologies for multi-optical mine detection

Proc. SPIE. 6553, Detection and Remediation Technologies for Mines and Minelike Targets XII

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

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PROCEEDINGS ARTICLE | October 5, 2006

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

Proc. SPIE. 6396, Electro-Optical Remote Sensing II

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

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PROCEEDINGS ARTICLE | May 16, 2006

Multi-optical mine detection: results from a field trial

Proc. SPIE. 6217, Detection and Remediation Technologies for Mines and Minelike Targets XI

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

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PROCEEDINGS ARTICLE | April 18, 2006

A fusion approach for coarse-to-fine target recognition

Proc. SPIE. 6242, Multisensor, Multisource Information Fusion: Architectures, Algorithms, and Applications 2006

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

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PROCEEDINGS ARTICLE | September 13, 2004

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

Proc. SPIE. 5412, Laser Radar Technology and Applications IX

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

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PROCEEDINGS ARTICLE | September 13, 2004

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

Proc. SPIE. 5412, Laser Radar Technology and Applications IX

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

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PROCEEDINGS ARTICLE | April 12, 2004

An information system for target recognition

Proc. SPIE. 5434, Multisensor, Multisource Information Fusion: Architectures, Algorithms, and Applications 2004

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

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PROCEEDINGS ARTICLE | October 22, 2001

Vehicle size and orientation estimation using geometric fitting

Proc. SPIE. 4379, Automatic Target Recognition XI

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

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PROCEEDINGS ARTICLE | May 28, 1999

Gated viewing for target detection and target recognition

Proc. SPIE. 3707, Laser Radar Technology and Applications IV

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

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PROCEEDINGS ARTICLE | September 18, 1998

Qualitative matching technique for handling uncertainties in laser radar data images

Proc. SPIE. 3371, Automatic Target Recognition VIII

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

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Showing 5 of 32 publications

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