Now showing items 1-20 of 23

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Real-time image segmentation on a GPU 

    Alexey, Abramov; Kulvicius, Tomas; Wörgötter, Florentin; Dellen, Babette (2010)
    Conference report
    Open Access
    Efficient segmentation of color images is important for many applications in computer vision. Non-parametric solutions are required in situations where little or no prior knowledge about the data is available. In this ...
  • Real-time segmentation of stereo videos on a portable system with a mobile GPU 

    Abramov, Alexey; Pauwels, Karl; Papon, Jeremie; Wörgötter, Florentin; Dellen, Babette (2012)
    Article
    Open Access
    In mobile robotic applications, visual information needs to be processed fast despite resource limitations of the mobile system. Here a novel real-time framework for model- free spatio-temporal segmentation of stereo ...
  • Robotic leaf probing via segmentation of range data into surface patches 

    Alenyà Ribas, Guillem; Dellen, Babette; Foix Salmerón, Sergi; Torras, Carme (2012)
    Conference report
    Open Access
    We present a novel method for the robotized probing of plant leaves using Time-of-Flight (ToF) sensors. Plant images are segmented into surface patches by combining a segmentation of the infrared intensity image, provided ...
  • Robotized plant probing: leaf segmentation utilizing time-of-flight data 

    Alenyà Ribas, Guillem; Dellen, Babette; Foix Salmerón, Sergi; Torras, Carme (2013)
    Article
    Open Access
    Supervision of long-lasting extensive botanic experiments is a promising robotic application that some recent technological advances have made feasible. Plant modeling for this application has strong demands, particularly ...
  • Segment tracking via a spatiotemporal linking process including feedback stabilization in an n-D lattice model 

    Dellen, Babette; Aksoy, Eren Erdal; Wörgötter, Florentin (2009)
    Article
    Open Access
    Model-free tracking is important for solving tasks such as moving-object tracking and action recognition in cases where no prior object knowledge is available. For this purpose, we extend the concept of spatially synchronous ...