Ara es mostren els items 9-28 de 29

    • Chromatic shadow detection and tracking for moving foreground segmentation 

      Huerta Casado, Iván; Holte, Michael B.; Moeslund, Thomas; Gonzàlez, Jordi (2015)
      Article
      Accés obert
      Advanced segmentation techniques in the surveillance domain deal with shadows to avoid distortions when detecting moving objects. Most approaches for shadow detection are still typically restricted to penumbra shadows and ...
    • Component-based human detection 

      Chakraborty, Bhaskar; Rius, Ignasi; Perdersoli, Marco; Mozerov, Mikhail; Gonzàlez, Jordi (s. n., 2007)
      Text en actes de congrés
      Accés obert
      In this paper, we present a general framework for human detection in a video sequence by components. The technique is demonstrated by developing a system that locates people in the cluttered scenes where they are performing ...
    • Computationally efficient graph matching via energy vector extraction 

      Amato, Ariel; Al, Murad; Lladós, Josep; Gonzàlez, Jordi (Springer, 2007)
      Text en actes de congrés
      Accés obert
      This paper presents a method for graph matching based on domain knowledge by quantifying representative graph features. Our method searches and extracts the most relevant cues in different graphs. Once these cues are ...
    • Constructing a path database for scene categorization 

      Baiget, Pau; Fernández, Carles; Amato, Ariel; Roca, Francesc Xavier; Gonzàlez, Jordi (s. n., 2007)
      Text en actes de congrés
      Accés obert
      Human behavior understanding in image sequences requires to study human interaction with the environment, because human beings behave depending on their location. Therefore, a semantic labeling of the scenario must be ...
    • Deterministic and stochastic methods for gaze tracking in real-time 

      Orozco, Francisco J.; Roca, Francesc Xavier; Gonzàlez, Jordi (Springer, 2007)
      Capítol de llibre
      Accés obert
      Psychological evidence demonstrates how eye gaze analysis is requested for human computer interaction endowed with emotion recognition capabilities. The existing proposals analyse eyelid and iris motion by using colour ...
    • Enhancing real-time human detection based on histograms of oriented gradients 

      Perdersoli, Marco; Gonzàlez, Jordi; Chakraborty, Bhaskar; Villanueva, Juan J. (Springer, 2007)
      Capítol de llibre
      Accés obert
      In this paper we propose a human detection framework based on an enhanced version of Histogram of Oriented Gradients (HOG) features. These feature descriptors are computed with the help of a precalculated histogram of ...
    • Face detection in color images using primitive shape features 

      Al, Murad; Amato, Ariel; Roca, Francesc Xavier; Gonzàlez, Jordi (Springer, 2007)
      Capítol de llibre
      Accés obert
      Face detection is a primary step in many applications such as face recognition, video surveillance, human computer interface, and expression recognition. Many existing detection techniques suffer under scale variation, ...
    • Finding faces in color images through primitive shape features 

      Al, Murad; Orozco, Francisco J.; Amato, Ariel; Roca, Francesc Xavier; Gonzàlez, Jordi (s. n., 2007)
      Text en actes de congrés
      Accés obert
      Face detection is a primary step in many applications such as face recognition, video surveillance, human computer interface, and expression recognition. Many existing detection techniques suffer under scale variation, ...
    • HERMES: A research project on human sequence evaluation 

      Gonzàlez, Jordi; Roca, Francesc Xavier; Villanueva, Juan J. (Taylor and Francis, 2007)
      Text en actes de congrés
      Accés obert
      Human Sequence Evaluation concentrates on how to extract descriptions of human behaviour from videos in a restricted discourse domain, such as (i) pedestrians crossing inner-city roads where pedestrians appear approaching ...
    • Hierarchical eyelid and face tracking 

      Orozco, Francisco J.; Gonzàlez, Jordi; Rius, Ignasi; Roca, Francesc Xavier (Springer Verlag, 2007)
      Capítol de llibre
      Accés obert
      Most applications on Human Computer Interaction (HCI) require to extract the movements of user faces, while avoiding high memory and time expenses. Moreover, HCI systems usually use low-cost cameras, while current face ...
    • High-level integration for cognitive vision surveillance 

      Fernández, Carles; Baiget, Pau; Roca, Francesc Xavier; Gonzàlez, Jordi (s. n., 2007)
      Text en actes de congrés
      Accés obert
      The increasing interest in Cognitive Vision Systems (CVS) motivates the apparition of ad-hoc stages designed for the integration of multiple kinds of knowledge. This paper proposes a novel ontology to restrict and integrate ...
    • Improving background subtraction based on a casuistry of colour-motion segmentation problems 

      Huerta Casado, Iván; Rowe, Daniel; Mozerov, Mikhail; Gonzàlez, Jordi (Springer Verlag, 2007)
      Capítol de llibre
      Accés obert
      The basis for the high-level interpretation of observed patterns of human motion still relies on motion segmentation. Popular approaches based on background subtraction use colour information to model each pixel during a ...
    • Natural language descriptions of human behaviour from video sequences 

      Fernández, Carles; Baiget, Pau; Roca, Francesc Xavier; Gonzàlez, Jordi (Springer, 2007)
      Capítol de llibre
      Accés obert
      This contribution addresses the generation of textual descriptions in several natural languages for evaluation of human behavior in video sequences. The problem is tackled by converting geometrical information extracted ...
    • On reasoning over tracking events 

      Rowe, Daniel; Gonzàlez, Jordi; Huerta Casado, Iván; Villanueva, Juan J. (Springer, 2007)
      Capítol de llibre
      Accés obert
      High-level understanding of motion events is a critical task in any system which aims to analyse dynamic human-populated scenes. However, current tracking techniques still do not address complex interaction events among ...
    • On-line one stroke character recognition using directional features 

      Al, Murad; Amato, Ariel; Sánchez, Gemma; Gonzàlez, Jordi (Springer, 2007)
      Text en actes de congrés
      Accés obert
      This paper presents a method based on directional features for recognizing on-line characters represented by one-stroke. A new alphabet is proposed, and each character is represented as a vector of directional angles. This ...
    • Ontology for semantic integration in a cognitive surveillance system 

      Fernández, Carles; Gonzàlez, Jordi (Springer, 2007)
      Capítol de llibre
      Accés obert
      The increasing interest in Cognitive Vision Systems (CVS) motivates the apparition of ad-hoc stages designed for the integration of multiple kinds of knowledge. This paper proposes a novel ontology to restrict and integrate ...
    • Robust multiple-people tracking using color-based particle filters 

      Rowe, Daniel; Huerta Casado, Iván; Gonzàlez, Jordi; Villanueva, Juan J. (Springer Verlag, 2007)
      Capítol de llibre
      Accés obert
      Robust and accurate people tracking is a key task in many promising computer-vision applications. One must deal with non-rigid targets in open-world scenarios, whose shape and appearance evolve over time. Targets may ...
    • Semantic annotation of complex human scenes for multimedia surveillance 

      Fernández, Carles; Baiget, Pau; Roca, Francesc Xavier; Gonzàlez, Jordi (Springer, 2007)
      Capítol de llibre
      Accés obert
      A Multimedia Surveillance System (MSS) is considered for automatically retrieving semantic content from complex outdoor scenes, involving both human behavior and traffic domains. To characterize the dynamic information ...
    • Spatio-temporal reasoning for reliable facial expression interpretation 

      Orozco, Francisco J.; García, Fabio A.; Arcos, Lluis; Gonzàlez, Jordi (Bielefeld University, 2007)
      Text en actes de congrés
      Accés obert
      Understanding human behaviours and emotions has received contributions from image analysis and pattern recognition techniques in order to tackle this challenge. The most popular facial expression classifiers deal with ...
    • Top-down model fitting for hand pose recovery in sequences of depth images 

      Madadi, Meysam; Escalera, Sergio; Carruesco Llorens, Àlex; Andújar Gran, Carlos Antonio; Baró, Xavier; Gonzàlez, Jordi (2018-11)
      Article
      Accés obert
      State-of-the-art approaches on hand pose estimation from depth images have reported promising results under quite controlled considerations. In this paper we propose a two-step pipeline for recovering the hand pose from a ...