Prof. Ari J. E. Visa Profile

Prof. Ari J. E. Visa

Professor at Tampere University

SPIE Involvement:

Author

Publications (28)

Proceedings Article | 22 September 2011 Paper

Converting a 3D surface into a set of directional scatterers for high-resolution radar response simulation

Henna Perälä, Minna Väilä, Juha Jylhä, Ilkka Venäläinen, Ari Visa

Proceedings Volume 8134, 81340H (2011) https://doi.org/10.1117/12.893485

KEYWORDS: Radar, Scattering, 3D modeling, 3D acquisition, Cameras, Ray tracing, Reflectivity, Reflection, Synthetic aperture radar, Motion models

Read Abstract +

Proceedings Article | 13 May 2010 Paper

Classification of radar data by detecting and identifying spatial and temporal anomalies

Minna Väilä, Ilkka Venäläinen, Juha Jylhä, Marja Ruotsalainen, Henna Perälä, Ari Visa

Proceedings Volume 7696, 76960G (2010) https://doi.org/10.1117/12.852252

KEYWORDS: Radar, Doppler effect, Surveillance, Signal to noise ratio, Radar signal processing, Target recognition, Spatial resolution, Antennas, Time-frequency analysis, Detection and tracking algorithms

Read Abstract +

Proceedings Article | 11 May 2009 Paper

Decomposing radar measurements through comprehensive response modeling

Ilkka Venäläinen, Juha Jylhä, Ville Väisänen, Juho Vihonen, Marja Ruotsalainen, Ari Visa

Proceedings Volume 7336, 73361K (2009) https://doi.org/10.1117/12.818990

KEYWORDS: Radar, Doppler effect, Motion models, Data modeling, Antennas, Scattering, Motion measurement, Statistical analysis, Statistical modeling, 3D modeling

Read Abstract +

Proceedings Article | 5 May 2009 Paper

Classification of items in a walk-through metal detector using time series of eigenvalues of the polarizability tensor

Jarmo Kauppila, Timo Ala-Kleemola, Juho Vihonen, Juha Jylhä, Marja Ruotsalainen, Ari Järvi, Ari Visa

Proceedings Volume 7303, 73030P (2009) https://doi.org/10.1117/12.818424

KEYWORDS: Sensors, Metals, Polarizability, Magnetism, Information security, Receivers, Transmitters, Electromagnetism, Control systems, Prototyping

Read Abstract +

Proceedings Article | 14 October 2008 Paper

Merging radar data with geographic data for visual land clutter source recognition

Henna Perälä, Juha Jylhä, Minna Väilä, Ari Visa

Proceedings Volume 7110, 711022 (2008) https://doi.org/10.1117/12.800329

KEYWORDS: Radar, Visualization, Data modeling, Geographic information systems, Databases, Modeling, Image processing, Antennas, Surveillance, Ray tracing

Read Abstract +

Proceedings Article | 10 October 2008 Paper

An approach to enhanced fidelity of airborne radar site-specific simulation

Ville Väisänen, Juha Jylhä, Ilkka Venäläinen, Juho Vihonen, Henna Perälä, Ari Visa

Proceedings Volume 7110, 71100J (2008) https://doi.org/10.1117/12.800216

KEYWORDS: Radar, Synthetic aperture radar, Antennas, Backscatter, Device simulation, Geographic information systems, Doppler effect, Systems modeling, Radar imaging, Data processing

Read Abstract +

Proceedings Article | 7 October 2008 Paper

Estimating dynamics of heavily fluctuating radar responses: a land clutter application and experimental results

Minna Väilä, Juha Jylhä, Henna Perälä, Ari Visa

Proceedings Volume 7112, 71120H (2008) https://doi.org/10.1117/12.800232

KEYWORDS: Radar, Receivers, Target detection, Statistical analysis, Radar signal processing, Interference (communication), Antennas, Doppler effect, Backscatter, Digital photography

Read Abstract +

Proceedings Article | 2 October 2008 Paper

Cumulative sum and neural network approach to the detection and identification of hazardous chemical agents from ion mobility spectra

Marja Ruotsalainen, Juho Vihonen, Juha Jylhä, Jarmo Kauppila, Osmo Anttalainen, Ari Visa

Proceedings Volume 7116, 71160R (2008) https://doi.org/10.1117/12.800248

KEYWORDS: Neural networks, Ions, Sensors, Principal component analysis, System identification, Humidity, Gases, Prototyping, Detection and tracking algorithms, Neurons

Read Abstract +

Proceedings Article | 12 October 2006 Paper

Incorporating weather conditions and various scatterers into volumetric radar clutter simulation

Riitta Kerminen, Juha Jylhä, Timo Ala-Kleemola, Juho Vihonen, Ari Visa

Proceedings Volume 6362, 636221 (2006) https://doi.org/10.1117/12.689877

KEYWORDS: Radar, Particles, Polarization, Computer simulations, Matrices, Electronic filtering, Clouds, Surveillance, Stochastic processes, Beam shaping

Read Abstract +

Proceedings Article | 29 September 2006 Paper

An efficient approach for site-specific scenery prediction in surveillance imaging near Earth's surface

Juha Jylhä, Kalle Marjanen, Mikko Rantala, Petri Metsäpuro, Ari Visa

Proceedings Volume 6365, 636508 (2006) https://doi.org/10.1117/12.689918

KEYWORDS: Cameras, Surveillance, 3D modeling, Geographic information systems, Systems modeling, Visibility, RGB color model, Photography, Sensors, Imaging systems

Read Abstract +

SPIE Journal Paper | 1 September 2006

Classification of natural rock images using classifier combinations

Leena Lepistö, Iivari Kunttu, Ari Visa

OE, Vol. 45, Issue 09, 097201, (September 2006) https://doi.org/10.1117/12.10.1117/1.2354086

KEYWORDS: Image classification, Probability theory, Databases, Visualization, Optical engineering, Feature extraction, Image analysis, Inspection, Pattern recognition, Visual analytics

Read Abstract +

SPIE Journal Paper | 1 October 2005 Open Access

Rock image classification using color features in Gabor space

Leena Lepistö, Iivari Kunttu, Ari Visa

JEI, Vol. 14, Issue 04, 040503, (October 2005) https://doi.org/10.1117/12.10.1117/1.2149872

KEYWORDS: Image classification, Optical filters, Image filtering, RGB color model, Image analysis, Bandpass filters, Databases, Visualization, Digital imaging, Gaussian filters

Read Abstract +

DOWNLOAD PAPER

SPIE Journal Paper | 1 August 2005 Open Access

Efficient Fourier shape descriptor for industrial defect images using wavelets

Iivari Kunttu, Leena Lepistö, Ari Visa

OE, Vol. 44, Issue 08, 080503, (August 2005) https://doi.org/10.1117/12.10.1117/1.1993687

KEYWORDS: Wavelets, Shape analysis, Databases, Wavelet transforms, Image processing, Image classification, Fourier transforms, Continuous wavelet transforms, Feature extraction, Image retrieval

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 25 May 2005 Paper

On joint phase-envelope use in radar CFAR processing

Juho Vihonen, Timo Ala-Kleemola, Timo Hintikka, Juha Jylha, Ari Visa

Proceedings Volume 5809, (2005) https://doi.org/10.1117/12.602719

KEYWORDS: Radar, Signal to noise ratio, Doppler effect, Signal detection, Target detection, Phase shift keying, Signal processing, Antennas, Fourier transforms, Detection and tracking algorithms

Read Abstract +

Proceedings Article | 16 May 2005 Paper

An improved method for helicopter categorization

Jani Tikkinen, Elina Helander, Timo Hintikka, Ari Visa

Proceedings Volume 5788, (2005) https://doi.org/10.1117/12.602467

KEYWORDS: Radar, Sensors, Signal processing, Signal to noise ratio, Doppler effect, Edge detection, Signal detection, Detection and tracking algorithms, Statistical analysis, Digital signal processing

Read Abstract +

Proceedings Article | 18 September 2003 Paper

A new method for outlier removal in time-delay-based direction of arrival estimates

Tuomo Pirinen, Pasi Pertila, Ari Visa

Proceedings Volume 5090, (2003) https://doi.org/10.1117/12.487078

KEYWORDS: Signal to noise ratio, Error analysis, Sensors, Acoustics, Interference (communication), Reliability, Detection and tracking algorithms, Signal detection, Wave propagation, Computer simulations

Read Abstract +

Proceedings Article | 18 September 2003 Paper

Comparison of three post-processing methods for acoustic localization

Pasi Pertila, Tuomo Pirinen, Ari Visa, Teemu Korhonen

Proceedings Volume 5090, (2003) https://doi.org/10.1117/12.487071

KEYWORDS: Signal to noise ratio, Sensors, Acoustics, Signal attenuation, Error analysis, Interference (communication), Wavefronts, Fusion energy, Distance measurement, Statistical methods

Read Abstract +

Proceedings Article | 21 March 2003 Paper

Data mining on nonhomogenous textures

Leena Lepisto, Iivari Kunttu, Jorma Autio, Ari Visa

Proceedings Volume 5098, (2003) https://doi.org/10.1117/12.486011

KEYWORDS: Visualization, Distance measurement, Databases, Image classification, Data mining, Statistical analysis, Feature extraction, Multimedia, Mining, Image retrieval

Read Abstract +

Proceedings Article | 21 March 2003 Paper

Classification method for defect images based on association and clustering

Iivari Kunttu, Leena Lepisto, Juhani Rauhamaa, Ari Visa

Proceedings Volume 5098, (2003) https://doi.org/10.1117/12.486007

KEYWORDS: Databases, Image segmentation, Image processing, Image classification, Mining, Distance measurement, Feature extraction, Inspection, Manufacturing, Visualization

Read Abstract +

Proceedings Article | 12 March 2002 Paper

Data mining on time series of sequential patterns

Ari Visa

Proceedings Volume 4730, (2002) https://doi.org/10.1117/12.460225

KEYWORDS: Data mining, Process control, Head, Autoregressive models, Signal processing, Time series analysis, Data modeling, Fourier transforms, Distance measurement, Control systems

Read Abstract +

Proceedings Article | 27 March 2001 Paper

Data mining of text as a tool in authorship attribution

Ari Visa, Jarmo Toivonen, Sami Autio, Jarno Maekinen, Barbro Back, Hannu Vanharanta

Proceedings Volume 4384, (2001) https://doi.org/10.1117/12.421068

KEYWORDS: Prototyping, Quantization, Data mining, Databases, Mining, Computer programming, Meteorology, Statistical analysis, Intellectual property

Read Abstract +

Proceedings Article | 11 October 2000 Paper

Sequence of texture images and process control

Ari Visa, Sami Autio

Proceedings Volume 4197, (2000) https://doi.org/10.1117/12.403755

KEYWORDS: Process control, Image processing, Stochastic processes, Feature extraction, Signal processing, Robots, Visualization, Matrices, Cameras, Chemical elements

Read Abstract +

Proceedings Article | 6 April 2000 Paper

Toward text understanding: classification of text documents by word map

Ari Visa, Jarmo Toivanen, Barbro Back, Hannu Vanharanta

Proceedings Volume 4057, (2000) https://doi.org/10.1117/12.381745

KEYWORDS: Computer programming, Neural networks, Databases, Associative arrays, Binary data, Quantization, Brain mapping, Data mining, Prototyping, Neurons

Read Abstract +

Proceedings Article | 6 October 1998 Paper

Unsupervised image segmentation with the self-organizing map and statistical methods

Jukka Iivarinen, Ari Visa

Proceedings Volume 3522, (1998) https://doi.org/10.1117/12.325796

KEYWORDS: Image segmentation, Statistical analysis, Defect detection, Prototyping, Feature extraction, Error analysis, Statistical methods, Image classification, Ions, Information technology

Read Abstract +

Proceedings Article | 29 October 1996 Paper

Shape recognition of irregular objects

Jukka Iivarinen, Ari Visa

Proceedings Volume 2904, (1996) https://doi.org/10.1117/12.256280

KEYWORDS: Shape analysis, Image segmentation, Object recognition, Distance measurement, Gaussian filters, Optical parametric oscillators, Binary data, Image processing, Information science, Machine vision

Read Abstract +

Proceedings Article | 2 March 1994 Paper

Experiences from operational cloud classifier based on self-organizing map

Ari Visa, K. Valkealahti, Jukka Iivarinen, O. Simula

Proceedings Volume 2243, (1994) https://doi.org/10.1117/12.169997

KEYWORDS: Clouds, Satellites, Neurons, Satellite imaging, Earth observing sensors, Neural networks, Feature extraction, Infrared radiation, Meteorology, Image classification

Read Abstract +

Proceedings Article | 1 July 1992 Paper

Topological feature map and automatic feature selection

Ari Visa

Proceedings Volume 1710, (1992) https://doi.org/10.1117/12.140148

KEYWORDS: Feature selection, Neurons, Image analysis, Pattern recognition, Artificial neural networks, Brain mapping, Neural networks, Image processing, Fourier transforms, Feature extraction

Read Abstract +

Proceedings Article | 1 August 1991 Paper

Texture classification and neural network methods

Ari Visa

Proceedings Volume 1469, (1991) https://doi.org/10.1117/12.45020

KEYWORDS: Neural networks, Stochastic processes, Image classification, Feature extraction, Image processing, Artificial neural networks, Databases, Image segmentation, Resonance energy transfer, Matrices

Read Abstract +

Showing 5 of 28 publications

Conference Committee Involvement (2)

Data Mining and Knowledge Discovery: Theory, Tools, and Technology VI

12 April 2004 | Orlando, Florida, United States

Data Mining and Knowledge Discovery: Theory, Tools, and Technology V

21 April 2003 | Orlando, Florida, United States

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years