Dr. Langis Gagnon Profile

Dr. Langis Gagnon

Scientific Director at CRIM

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 3 June 2011 Paper

A system for airport surveillance: detection of people running, abandoned objects, and pointing gestures

Samuel Foucher, Marc Lalonde, Langis Gagnon

Proceedings Volume 8056, 805610 (2011) https://doi.org/10.1117/12.884402

KEYWORDS: Cameras, Video, Video surveillance, Data mining, Detection and tracking algorithms, Surveillance, Sensors, Imaging systems, Radiofrequency ablation, Algorithm development

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Proceedings Article | 15 April 2010 Paper

Unconstrained license plate detection using the Hausdorff distance

M. Lalonde, S. Foucher, L. Gagnon

Proceedings Volume 7701, 77010V (2010) https://doi.org/10.1117/12.850403

KEYWORDS: Cameras, Image processing, Image quality, Image segmentation, Image enhancement, Binary data, Distance measurement, Surveillance, Imaging systems, Sensors

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Proceedings Article | 15 April 2010 Paper

Automatic scene activity modeling for improving object classification

S. Foucher, M. Lalonde, L. Gagnon

Proceedings Volume 7701, 770104 (2010) https://doi.org/10.1117/12.850273

KEYWORDS: Scene classification, Buildings, Expectation maximization algorithms, Classification systems, Prototyping, Video surveillance, Statistical modeling, Image quality, Cameras, Detection and tracking algorithms

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SPIE Journal Paper | 1 April 2009

Segmentation of non-natural objects in landscape images using ridgelet transform

Langis Gagnon, Samuel Foucher

JEI, Vol. 18, Issue 02, 023010, (April 2009) https://doi.org/10.1117/12.10.1117/1.3134137

KEYWORDS: Image segmentation, Image classification, Principal component analysis, Fourier transforms, Scalable video coding, Image processing, Image filtering, Databases, Statistical analysis, Wavelet transforms

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Proceedings Article | 4 March 2008 Paper

Designing caption production rules based on face, text, and motion detection

C. Chapdelaine, M. Beaulieu, L. Gagnon

Proceedings Volume 6806, 68061K (2008) https://doi.org/10.1117/12.766841

KEYWORDS: Facial recognition systems, Visualization, Image processing, Motion detection, Detection and tracking algorithms, Video, Optical flow, Televisions, Product engineering, Information visualization

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Proceedings Article | 30 April 2007 Paper

A system to automatically track humans and vehicles with a PTZ camera

M. Lalonde, S. Foucher, L. Gagnon, E. Pronovost, M. Derenne, A. Janelle

Proceedings Volume 6575, 657502 (2007) https://doi.org/10.1117/12.718446

KEYWORDS: Cameras, Video surveillance, Object recognition, Imaging systems, Automatic tracking, Particles, Zoom lenses, Intelligence systems, Software development, Environmental sensing

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Proceedings Article | 12 February 2007 Paper

Improving video captioning for deaf and hearing-impaired people based on eye movement and attention overload

C. Chapdelaine, V. Gouaillier, M. Beaulieu, L. Gagnon

Proceedings Volume 6492, 64921K (2007) https://doi.org/10.1117/12.703344

KEYWORDS: Video, Visualization, Eye, Facial recognition systems, Motion detection, Detection and tracking algorithms, Optical tracking, Televisions, Optical flow, Calibration

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Proceedings Article | 12 May 2006 Paper

A system for tracking and recognizing pedestrian faces using a network of loosely coupled cameras

L. Gagnon, F. Laliberté, S. Foucher, A. Branzan Albu, D. Laurendeau

Proceedings Volume 6246, 62460N (2006) https://doi.org/10.1117/12.663648

KEYWORDS: Facial recognition systems, Databases, Cameras, Data modeling, Distance measurement, Imaging systems, Nose, Mouth, Image filtering, Video surveillance

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Proceedings Article | 17 February 2006 Paper

Key-text spotting in documentary videos using Adaboost

M. Lalonde, L. Gagnon

Proceedings Volume 6064, 60641N (2006) https://doi.org/10.1117/12.641924

KEYWORDS: Video, Optical character recognition, Error analysis, Feature extraction, Image processing, Sensors, Video processing, Image quality, Feature selection, Visualization

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Proceedings Article | 25 October 2005 Paper

R and D status of ERIC-7 and MADIS: two systems for MPEG-7 indexing/search of audio-visual content

L. Gagnon

Proceedings Volume 6015, 601511 (2005) https://doi.org/10.1117/12.627043

KEYWORDS: Visualization, Computer programming, Facial recognition systems, Databases, Video, Multimedia, Human-machine interfaces, Video processing, Analytical research, Standards development

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Proceedings Article | 22 March 2005 Paper

Three-dimensional visualization of human fundus from a sequence of angiograms

France Laliberte, Langis Gagnon, Yunlong Sheng

Proceedings Volume 5664, (2005) https://doi.org/10.1117/12.583379

KEYWORDS: Cameras, Eye, Angiography, 3D acquisition, 3D image processing, Retina, Visualization, 3D modeling, Spherical lenses, Blood vessels

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Proceedings Article | 7 June 2004 Paper

Global semantic classification of scenes using ridgelet transform

Samuel Foucher, Valerie Gouaillier, Langis Gagnon

Proceedings Volume 5292, (2004) https://doi.org/10.1117/12.527262

KEYWORDS: Classification systems, Radon transform, Fourier transforms, Statistical analysis, Digital imaging, Chlorine, Binary data, Databases, Wavelets, Wavelet transforms

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Proceedings Article | 15 December 2003 Paper

MPEG-7 audio-visual indexing test-bed for video retrieval

Langis Gagnon, Samuel Foucher, Valerie Gouaillier, Christelle Brun, Julie Brousseau, Gilles Boulianne, Frederic Osterrath, Claude Chapdelaine, Julie Dutrisac, Francis St-Onge, Benoit Champagne, Xiaojian Lu

Proceedings Volume 5304, (2003) https://doi.org/10.1117/12.524495

KEYWORDS: Visualization, Computer programming, Facial recognition systems, Video, Databases, Image segmentation, Internet, Speech recognition, Standards development, Multimedia

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Proceedings Article | 14 August 2003 Paper

Texture-based segmentation of temperate-zone woodland in panchromatic IKONOS imagery

Langis Gagnon, Pierre Bugnet, Francois Cavayas

Proceedings Volume 5097, (2003) https://doi.org/10.1117/12.485913

KEYWORDS: Image segmentation, Earth observing sensors, Image filtering, High resolution satellite images, Image classification, Satellite imaging, Satellites, Image resolution, Environmental sensing, Airborne remote sensing

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Proceedings Article | 3 July 2001 Paper

Procedure to detect anatomical structures in optical fundus images

Langis Gagnon, Marc Lalonde, Mario Beaulieu, Marie-Carole Boucher

Proceedings Volume 4322, (2001) https://doi.org/10.1117/12.430999

KEYWORDS: Macula, Image quality, Image processing, Visualization, Detection and tracking algorithms, Optical discs, Databases, Image resolution, Automatic tracking, Cameras

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Proceedings Article | 29 June 2000 Paper

Experimenting level set-based snakes for contour segmentation in radar imagery

Frederic Lesage, Langis Gagnon

Proceedings Volume 4041, (2000) https://doi.org/10.1117/12.390480

KEYWORDS: Image segmentation, Radar, Synthetic aperture radar, Image processing, Edge detection, Chromium, Image resolution, Image classification, Coherence imaging, Image processing algorithms and systems

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Proceedings Article | 15 July 1999 Paper

Stabilization of infrared image sequence with differential invariants and M-estimators

Daniel McReynolds, Pascal Marchand, Yunlong Sheng, Langis Gagnon, Leandre Sevigny

Proceedings Volume 3692, (1999) https://doi.org/10.1117/12.352873

KEYWORDS: Image registration, Cameras, Distortion, Image processing, Infrared imaging, Sensors, Image filtering, Image sensors, Infrared radiation, Surveillance

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Proceedings Article | 12 March 1999 Paper

Real-world multisensor image alignment using edge focusing and Hausdorff distances

Yunlong Sheng, Xiangjie Yang, Daniel McReynolds, Zhong Zhang, Langis Gagnon, Leandre Sevigny

Proceedings Volume 3719, (1999) https://doi.org/10.1117/12.341340

KEYWORDS: Sensors, Image registration, Infrared imaging, Edge detection, Image sensors, Image fusion, Visible radiation, Feature extraction, Thermography, Distance measurement

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Proceedings Article | 4 December 1998 Paper

R&D activities in airborne SAR image processing/analysis at Lockheed Martin Canada

Langis Gagnon, H. Oppenheim, Pierre Valin

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328670

KEYWORDS: Synthetic aperture radar, Image processing, Image filtering, Wavelets, Speckle, Detection and tracking algorithms, Image resolution, Target detection, Sensors, Surveillance

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Proceedings Article | 4 December 1998 Paper

Stabilization of infrared image sequence with rotation, scaling and view angle changes

Daniel McReynolds, Yunlong Sheng, Langis Gagnon, Leandre Sevigny

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328669

KEYWORDS: Cameras, Infrared imaging, Infrared radiation, Distortion, Image enhancement, 3D modeling, Image processing, Image registration, Sensors, Image filtering

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Proceedings Article | 18 September 1998 Paper

Hierarchical classifier design for airborne SAR images of ships

Langis Gagnon, Robert Klepko

Proceedings Volume 3371, (1998) https://doi.org/10.1117/12.323866

KEYWORDS: Synthetic aperture radar, Image segmentation, Radar, Scattering, Databases, Image fusion, Image processing, Surveillance, Computer simulations, Solid modeling

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Proceedings Article | 30 October 1997 Paper

Speckle filtering of SAR images: a comparative study between complex-wavelet-based and standard filters

Langis Gagnon, Alexandre Jouan

Proceedings Volume 3169, (1997) https://doi.org/10.1117/12.279681

KEYWORDS: Image filtering, Speckle, Wavelets, Synthetic aperture radar, Radar imaging, Radar

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Proceedings Article | 30 October 1997 Paper

Ship silhouette recognition using principal components analysis

Valerie Gouaillier, Langis Gagnon

Proceedings Volume 3164, (1997) https://doi.org/10.1117/12.279572

KEYWORDS: Principal component analysis, Synthetic aperture radar, Target recognition, Image segmentation, Image classification, Data compression, Radar, Detection and tracking algorithms, Chromium, Device simulation

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Proceedings Article | 24 September 1997 Paper

Classification of ships in airborne SAR imagery using backpropagation neural networks

Hossam Osman, Li Pan, Steven Blostein, Langis Gagnon

Proceedings Volume 3161, (1997) https://doi.org/10.1117/12.279464

KEYWORDS: Synthetic aperture radar, Image classification, Image resolution, Neural networks, Feature extraction, Speckle, Image filtering, Device simulation, Detection and tracking algorithms, Classification systems

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Proceedings Article | 16 June 1997 Paper

Fusion of imaging and nonimaging data for surveillance aircraft

Elisa Shahbazian, Langis Gagnon, Jean Remi Duquet, Maciej Macieszczak, Pierre Valin

Proceedings Volume 3067, (1997) https://doi.org/10.1117/12.276117

KEYWORDS: Data fusion, Sensors, Synthetic aperture radar, Radar, Image segmentation, Detection and tracking algorithms, Computer architecture, Image analysis, Image classification, Surveillance

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Proceedings Article | 31 May 1996 Paper

Speckle noise reduction of airborne SAR images with symmetric Daubechies wavelets

Langis Gagnon, Fatima Drissi Smaili

Proceedings Volume 2759, (1996) https://doi.org/10.1117/12.241168

KEYWORDS: Wavelets, Synthetic aperture radar, Speckle, Digital filtering, Discrete wavelet transforms, Image segmentation, Image filtering, Denoising, Linear filtering, Image processing

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Proceedings Article | 1 September 1995 Paper

Image enhancement with symmetric Daubechies wavelets

Jean-Marc Lina, Langis Gagnon

Proceedings Volume 2569, (1995) https://doi.org/10.1117/12.217575

KEYWORDS: Wavelets, Reconstruction algorithms, Image enhancement, Image filtering, Signal processing, Mammography, Convolution, Wavelet transforms, Interference (communication), Filtering (signal processing)

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Showing 5 of 27 publications

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