Ara es mostren els items 20-39 de 87

  • Cancellation of scattering mechanisms in PolInSAR: application to underlying topography estimation 

    López Martínez, Carlos; Papathanassiou, Kostantinos (IEEE Press. Institute of Electrical and Electronics Engineers, 2013-02)
    Article
    Accés restringit per política de l'editorial
    This paper investigates the polarimetric dependence of the interferometric complex correlation and proposes amethodology for cancelling individual scattering mechanisms, in terms of the complex correlation coefficient ...
  • Coherence estimation in synthetic aperture radar data based on speckle noise modeling 

    López Martínez, Carlos; Pottier, Eric (Optical Society of America, 2007-02-28)
    Article
    Accés obert
    In the past we proposed a multidimensional speckle noise model to which we now include systematic phase variation effects. This extension makes it possible to define what is believed to be a novel coherence model able to ...
  • Differential SAR interferometry with orbital, airborne and ground-based sensors 

    Monells Miralles, Daniel; Mallorquí Franquet, Jordi Joan; Aguasca Solé, Alberto; Broquetas Ibars, Antoni; Fabregas Canovas, Francisco Javier; López Martínez, Carlos; Alonso González, Alberto; Iglesias González, Rubén; Centolanza, Giuseppe (2011)
    Comunicació de congrés
    Accés obert
    • Introduction to Differential Interferometry • Orbital Sensors: ERS, ENVISAT, RADARSAT2, TerraSAR-X. • Airborne Sensors: DLR’s E-SAR • Ground-Based Sensors: UPC’s GB-SAR • Conclusions
  • Edge enhancement algorithm based on the wavelet transform for automatic edge detection in SAR images 

    Tello Alonso, Mª Victoria; López Martínez, Carlos; Mallorquí Franquet, Jordi Joan; Salembier Clairon, Philippe Jean (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-01-01)
    Article
    Accés obert
    This paper presents a novel technique for automatic edge enhancement and detection in synthetic aperture radar (SAR) images. The characteristics of SAR images justify the importance of an edge enhancement step prior to ...
  • Estimation of snow pack characteristics by means of polarimetric SAR data 

    Reppucci, Antonio; Banque, Xavier; López Martínez, Carlos; Zhan, Yu; Alonso González, Alberto (SPIE, 2012)
    Text en actes de congrés
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    Characterization of the snow-pack is fundamental for several applications in hydrology, such as modelling and forecasting of snow melt runoff, water resource management and risk analysis. Thanks to its night/day capabilities ...
  • Evaluation of a bilateral filtering approach for tomographic SAR denoising 

    D'Hondt, Olivier; Guillaso, Stephane; López Martínez, Carlos; Hellwich, Ollaf (VDE-Verlag, 2016)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    This work proposes to evaluate the effects of a spatially adaptive filter called NDSAR-BLF (N-Dimensional SAR Bilateral Filter) on scatterer separation and height estimation from SAR tomograms. We have developed a spatial ...
  • Exploitation of the additive component of the polarimetric noise model for speckle filtering 

    Foucher, Samuel; Farage, Grégory; López Martínez, Carlos (2010)
    Text en actes de congrés
    Accés obert
    Ratio filters for speckle noise reduction in SAR imagery are recursive filters where the image structure is iteratively recovered from an initial oversmoothed image. We show that the MBPolSAR filter could be interepreted ...
  • Exploiting polarimetric TerraSAR-X data for sea clutter characterization 

    Makhoul Varona, Eduardo; López Martínez, Carlos; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 2016-01-01)
    Article
    Accés obert
    This paper presents a detailed characterization of sea/ocean clutter returns at X-band, imaged by TerraSAR-X (TSX) mission from the radiometric, statistical, and polarimetric standpoints. Different TSX data takes, covering ...
  • Filtering and segmentation of polarimetric SAR data based on binary partition trees 

    Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (IEEE Press. Institute of Electrical and Electronics Engineers, 2012-02)
    Article
    Accés restringit per política de l'editorial
    In this paper,we propose the use of binary partition trees (BPT) to introduce a novel region-based and multi-scale polarimetric SAR (PolSAR) data representation. The BPT structure represents homogeneous regions in the ...
  • Filtering and segmentation of polarimetric SAR images with binary partition trees 

    Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (2010)
    Text en actes de congrés
    Accés obert
    A new multi-scale PolSAR data filtering technique, based on a Binary Partition Tree (BPT) representation of the data, is proposed. Different alternatives for the construction and the exploitation of the BPT for filtering ...
  • Forest parameter estimation in the Pol-InSAR context employing the multiplicative–additive speckle noise model 

    López Martínez, Carlos; Fabregas Canovas, Francisco Javier; Pipia, Luca (2011-09)
    Article
    Accés restringit per política de l'editorial
    This paper addresses the problem of speckle noise on single baseline polarimetric SAR interferometry (Pol-InSAR) on the basis of the multiplicative–additive speckle noise model. Considering this speckle noise model, a novel ...
  • Fuzzy cognitive maps applied to synthetic aperture radar image classifications 

    Pajares Martinsanz, Gonzalo; Sánchez Lladó, Francisco Javier; López Martínez, Carlos (Springer Verlag, 2011-08-08)
    Text en actes de congrés
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    This paper proposes a method based on Fuzzy Cognitive Maps (FCM) for improving the classification provided by the Wishart maximum-likelihood based approach in Synthetic Aperture Radar (SAR) images. FCM receives the ...
  • Ground topography estimation on over forests considering polarimetric SAR interferometry 

    López Martínez, Carlos; Alonso González, Alberto; Fabregas Canovas, Francisco Javier; Papathanassiou, Kostantinos (2010)
    Text en actes de congrés
    Accés obert
    The work detailed in this paper analyzes the topographic phase retrieval process on forested areas by means of Polarimetric Interferometric SAR data. On the basis of the Random Volume over Ground scattering model, an ...
  • Ground topography retrieval on forested areas based on polarimetric SAR interferometry 

    López Martínez, Carlos; Fabregas Canovas, Francisco Javier; Alonso García, Alberto; Papathanassiou, Kostantinos (2010)
    Text en actes de congrés
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    The work shown in this paper analyzes the topographic phase retrieval process on forested areas by means of Polarimetric Interferometric SAR (PolInSAR) data. On the basis of the Random Volume over Ground scattering model, ...
  • Ground-based polarimetric SAR interferometry for the monitoring of terrain displacement phenomena-part I: theoretical description 

    Iglesias González, Rubén; Aguasca Solé, Alberto; Fabregas Canovas, Francisco Javier; Mallorquí Franquet, Jordi Joan; Monells Miralles, Daniel; López Martínez, Carlos; Pipia, Luca (2015-03-01)
    Article
    Accés obert
    Ground-based synthetic aperture radar (SAR) (GB-SAR) sensors represent an effective solution for the monitoring of ground displacement episodes. Initially, the most GB-SAR sensors were based on vector network analyzers ...
  • Ground-based polarimetric SAR interferometry for the monitoring of terrain displacement phenomena-part II: applications 

    Iglesias González, Rubén; Aguasca Solé, Alberto; Fabregas Canovas, Francisco Javier; Mallorquí Franquet, Jordi Joan; Monells Miralles, Daniel; López Martínez, Carlos; Pipia, Luca (2015-03-01)
    Article
    Accés obert
    Urban subsidence and landslides are among the greatest hazards for people and infrastructure safety and they require an especial attention to reduce their associated risks. In this framework, ground-based synthetic aperture ...
  • Higher order statistics for texture analysis and physical interpretation of polarimetric SAR data 

    Deng, Xinping; López Martínez, Carlos (2016-07-01)
    Article
    Accés obert
    The logarithmic cumulants (log-cumulants for short) of the second and third orders are widely used in the statistical analysis of polarimetric synthetic aperture radar (PolSAR) data. However, both the product model and the ...
  • Improving the wishart synthetic aperture radar image classifications through deterministic simulated annealing 

    Sánchez Lladó, Francisco Javier; Pajares Martinsanz, Gonzalo; López Martínez, Carlos (2011-11)
    Article
    Accés restringit per política de l'editorial
    This paper proposes the use of Deterministic Simulated Annealing (DSA) for Synthetic Aperture Radar (SAR) image classification for cluster refinement. We use the initial classification provided by the maximum- likelihood ...
  • Improving wishart classification of polarimetric SAR data using the hopfield neural network optimization approach 

    Pajares Martinsanz, Gonzalo; López Martínez, Carlos; Sánchez Lladó, Francisco Javier; Molina, Iñigo (2012-11-19)
    Article
    Accés restringit per política de l'editorial
    This paper proposes the optimization relaxation approach based on the analogue Hopfield Neural Network (HNN) for cluster refinement of pre-classified Polarimetric Synthetic Aperture Radar (PolSAR) image data. We consider ...
  • Influence of speckle filtering of polarimetric SAR data on different classification methods 

    Fang, Cao; Deladalle, Charles-Alban; Nicolas, Jean-Marie; Tupin, Florence; Denis, Loic; Ferro-Famil, Laurent; Pottier, Eric; López Martínez, Carlos (IEEE, 2011)
    Text en actes de congrés
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    This paper analyzes the effects of speckle filtering on polarimetric SAR decomposition and classification. We compared the results of the refined Lee, IDAN and Non-Local Polarimetric filters, and discussed their ALOS/PALSAR ...