Now showing items 1-20 of 32

    • 3D modelling of leaves from color and ToF data for robotized plant measuring 

      Alenyà Ribas, Guillem; Dellen, Babette; Torras, Carme (2011)
      Conference report
      Restricted access - publisher's policy
      Supervision of long-lasting extensive botanic experiments is a promising robotic application that some recent technological advances have made feasible. Plant modelling for this application has strong demands, particularly ...
    • 3D object reconstruction from Swissranger sensor data using a spring-mass model 

      Dellen, Babette; Alenyà Ribas, Guillem; Foix Salmerón, Sergi; Torras, Carme (INSTICC Press. Institute for Systems and Technologies of Information, Control and Communication, 2009)
      Part of book or chapter of book
      Restricted access - publisher's policy
      We register close-range depth images of objects using a Swissranger sensor and apply a spring-mass model for 3D object reconstruction. The Swissranger sensor delivers depth images in real time which have, compared with ...
    • 3d semantic representation of actions from effcient stereo-image-sequence segmentation on GPUs 

      Alexey, Abramov; Aksoy, Eren Erdal; Dörr, Johannes; Wörgötter, Florentin; Pauwels, Karl; Dellen, Babette (2010)
      Conference report
      Open Access
      A novel real-time framework for model-free stereo-video segmentation and stereo-segment tracking is presented, combining real-time optical flow and stereo with image segmentation running separately on two GPUs. The ...
    • A local algorithm for the computation of image velocity via constructive interference of global Fourier components 

      Dellen, Babette; Wörgötter, Florentin (2011)
      Article
      Open Access
      A novel Fourier-based technique for local motion detection from image sequences is proposed. In this method, the instantaneous velocities of local image points are inferred directly from the global 3D Fourier components ...
    • A novel real-time edge-preserving smoothing filter 

      Reich, Simon; Abramov, Alexey; Papon, Jeremie; Worgotter, Florentin; Dellen, Babette (2013)
      Conference report
      Open Access
      The segmentation of textured and noisy areas in images is a very challenging task due to the large variety of objects and materials in natural environments, which cannot be solved by a single similarity measure. In this ...
    • Action recognition based on efficient deep feature learning in the spatio-temporal domain 

      Husain, Syed Farzad; Dellen, Babette; Torras, Carme (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Article
      Open Access
      Hand-crafted feature functions are usually designed based on the domain knowledge of a presumably controlled environment and often fail to generalize, as the statistics of real-world data cannot always be modeled correctly. ...
    • Categorizing object-actions relations from semantic scene graphs 

      Aksoy, Eren Erdal; Abramov, Alexey; Wörgötter, Florentin; Dellen, Babette (2010)
      Conference report
      Restricted access - publisher's policy
      In this work we introduce a novel approach for detecting spatiotemporal object-action relations, leading to both, action recognition and object categorization. Semantic scene graphs are extracted from image sequences and ...
    • Channel coding for joint colour and depth segmentation 

      Wallenberg, Markus; Felsberg, Michael; Forssen, Per-Erik; Dellen, Babette (Springer, 2011)
      Conference report
      Restricted access - publisher's policy
      Segmentation is an important preprocessing step in many applications. Compared to colour segmentation, fusion of colour and depth greatly improves the segmentation result. Such a fusion is easy to do by stacking ...
    • Combining semantic and geometric features for object class segmentation of indoor scenes 

      Husain, Syed Farzad; Schulz, Hannes; Dellen, Babette; Torras, Carme; Behnke, Sven (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Article
      Open Access
      Scene understanding is a necessary prerequisite for robots acting autonomously in complex environments. Low-cost RGB-D cameras such as Microsoft Kinect enabled new methods for analyzing indoor scenes and are now ubiquitously ...
    • Consistent depth video segmentation using adaptive surface models 

      Husain, Syed Farzad; Dellen, Babette; Torras, Carme (2014)
      Article
      Open Access
      We propose a new approach for the segmentation of 3-D point clouds into geometric surfaces using adaptive surface models. Starting from an initial configuration, the algorithm converges to a stable segmentation through a ...
    • Contextual interactions in a generalized energy model of complex cells 

      Dellen, Babette; Clark, John W.; Wessel, Ralf (2009)
      Article
      Open Access
      We propose a generalized energy model of complex cells to describe modulatory contextual influences on the responses of neurons in the primary visual cortex (V1). Many orientationselective cells in V1 respond to contrast ...
    • Depth-supported real-time video segmentation with the Kinect 

      Abramov, Alexey; Pauwels, Karl; Papon, Jeremie; Wörgötter, Florentin; Dellen, Babette (2011)
      Conference report
      Restricted access - publisher's policy
      We present a real-time technique for the spatiotemporal segmentation of color/depth movies. Images are segmented using a parallel Metropolis algorithm implemented on a GPU utilizing both color and depth information, acquired ...
    • Disparity from stereo-segment silhouettes of weakly-textured images 

      Dellen, Babette; Wörgötter, Florentin (2009)
      Conference report
      Open Access
      We propose a novel robust stereo algorithm for weakly-textured scenes. Unique correspondences existing between the silhouettes of corresponding image segments allow assigning accurate disparities to segment boundary points. ...
    • Execution of a dual-object (pushing) action with semantic event chains 

      Aksoy, Eren Erdal; Dellen, Babette; Tamosiunaite, Minija; Wörgötter, Florentin (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
      Conference report
      Open Access
      Execution of a manipulation after learning from demonstration many times requires intricate planning and control systems or some form of manual guidance for a robot. Here we present a framework for manipulation execution ...
    • Growth signatures of rosette plants from time-lapse video 

      Dellen, Babette; Scharr, Hanno; Torras, Carme (2015)
      Article
      Open Access
      Plant growth is a dynamic process, and the precise course of events during early plant development is of major interest for plant research. In this work, we investigate the growth of rosette plants by processing time-lapse ...
    • Joint segmentation and tracking of object surfaces in depth movies along human/robot manipulations 

      Dellen, Babette; Husain, Syed Farzad; Torras, Carme (2013)
      Conference report
      Open Access
      A novel framework for joint segmentation and tracking in depth videos of object surfaces is presented. Initially, the 3D colored point cloud obtained using the Kinect camera is used to segment the scene into surface patches, ...
    • Learning the semantics of object-action relations by observation 

      Aksoy, Eren Erdal; Abramov, Alexey; Dörr, Johannes; Ning, Kejun; Dellen, Babette; Wörgötter, Florentin (2011-10-28)
      Article
      Open Access
      Recognizing manipulations performed by a human and the transfer and execution of this by a robot is a difficult problem. We address this in the current study by introducing a novel representation of the relations between ...
    • Local stimulus disambiguation with global motion filters predicts adaptive surround modulation 

      Dellen, Babette; Torras, Carme (2013)
      Article
      Open Access
      Humans have no problem segmenting different motion stimuli despite the ambiguity of local motion signals. Adaptive surround modulation, i.e., the apparent switching between integrative and antagonistic modes, is assumed ...
    • Modeling leaf growth of rosette plants using infrared stereo image sequences 

      Eren Erdal, Aksoy; Abramov, Alexey; Worgotter, Florentin; Scharr, Hanno; Fischbach, Andreas; Dellen, Babette (2015)
      Article
      Open Access
      In this paper, we present a novel multi-level procedure for finding and tracking leaves of a rosette plant, in our case up to 3 weeks old tobacco plants, during early growth from infrared-image sequences. This allows ...
    • Motion processing with wide-field neurons in the retino-tecto-rotundal pathway 

      Dellen, Babette; Wessel, Ralf; Clark, John W.; Wörgötter, Florentin (2010-02)
      Article
      Open Access
      The retino-tecto-rotundal pathway is the main visual pathway in nonmammalian vertebrates and has been found to be highly involved in visual processing. Despite the extensive receptive fields of tectal and rotundal wide-field ...