Browsing by Author "Güdükbay, Uğur"

Now showing items 21-40 of 114

    • Computer vision based method for real-time fire and flame detection 

      Töreyin, B. U.; Dedeoǧlu, Y.; Güdükbay, Uğur; Çetin, A. Enis (Elsevier BV, 2006-01-01)
      This paper proposes a novel method to detect fire and/or flames in real-time by processing the video data generated by an ordinary camera monitoring a scene. In addition to ordinary motion and color clues, flame and fire ...

    • Computer vision based text and equation editor for LATEX 

      Öksüz, Özcan; Güdükbay, Uğur; Çetin, Enis (IEEE, 2004-06)
      In this paper, we present a computer vision based text and equation editor for LATEX. The user writes text and equations on paper and a camera attached to a computer records actions of the user. In particular, positions ...

    • Connectivity-guided adaptive lifting transform for image like compression of meshes 

      Köse, Kıvanç; Çetin, A. Enis; Güdükbay, Uğur; Onural, Levent (IEEE, 2007-05)
      We propose a new connectivity-guided adaptive wavelet transform based mesh compression framework. The 3D mesh is first transformed to 2D images on a regular grid structure by performing orthogonal projections onto the image ...

    • Conservative occlusion culling for urban visualization using a slice-wise data structure 

      Yılmaz, T.; Güdükbay, Uğur (Academic Press, 2007)
      In this paper, we propose a framework for urban visualization using a conservative from-region visibility algorithm based on occluder shrinking. The visible geometry in a typical urban walkthrough mainly consists of partially ...

    • Content-based retrieval of historical Ottoman documents stored as textual images 

      Şaykol, E.; Sinop, A. K.; Güdükbay, Uğur; Ulusoy, Özgür; Çetin, A. Enis (IEEE, 2004)
      There is an accelerating demand to access the visual content of documents stored in historical and cultural archives. Availability of electronic imaging tools and effective image processing techniques makes it feasible to ...

    • A conversational agent framework with multi-modal personality expression 

      Sonlu, Sinan; Güdükbay, Uğur; Durupınar, Funda (Association for Computing Machinery, 2021-02)
      Consistently exhibited personalities are crucial elements of realistic, engaging, and behavior-rich conversational virtual agents. Both nonverbal and verbal cues help convey these agents’ unseen psychological states, ...

    • A database model for querying visual surveillance videos by integrating semantic and low-level features 

      Şaykol, Ediz; Güdükbay, Uğur; Ulusoy, Özgür (Springer, Berlin, Heidelberg, 2005)
      Automated visual surveillance has emerged as a trendy application domain in recent years. Many approaches have been developed on video processing and understanding. Content-based access to surveillance video has become a ...

    • Deep convolutional generative adversarial networks for flame detection in video 

      Aslan, Süleyman; Güdükbay, Uğur; Töreyin, B. U.; Çetin, A. Enis (Springer, Cham, 2020)
      Real-time flame detection is crucial in video-based surveillance systems. We propose a vision-based method to detect flames using Deep Convolutional Generative Adversarial Neural Networks (DCGANs). Many existing supervised ...

    • Direct volume rendering of unstructured grids 

      Berk, Hakan; Aykanat, Cevdet; Güdükbay, Uğur (Pergamon Press, 2003)
      This paper investigates three categories of algorithms for direct volume rendering of unstructured grids, which are image-space, object-space, and hybrid methods. We propose three new algorithms. Cell Projection algorithm, ...

    • Direct volume rendering of unstructured tetrahedral meshes using CUDA and OpenMP 

      Okuyan, E.; Güdükbay, Uğur (2014)
      Direct volume visualization is an important method in many areas, including computational fluid dynamics and medicine. Achieving interactive rates for direct volume rendering of large unstructured volumetric grids is a ...

    • Dynamic point-region quadtrees for particle simulations 

      Oğuz, O.; Durupınar, F.; Güdükbay, Uğur (Elsevier Inc., 2013)
      We propose an algorithm for dynamically updating point-region (PR) quadtrees. Our algorithm is optimized for simultaneous update of data points comprising a quadtree. The intended application area focuses on simulating ...

    • Dynamic view-dependent visualization of unstructured tetrahedral volumetric meshes 

      Okuyan, E.; Güdükbay, Uğur; Işler, V. (Springer, 2012)
      Visualization of large volumetric datasets has always been an important problem. Due to the high computational requirements of volume-rendering techniques, achieving interactive rates is a real challenge. We present a ...

    • E-museum: web-based tour and information system for museums 

      Baştanlar, Y.; Altıngövde, İsmail Şenol; Aksay, A.; Alav, O.; Çavuş, Özge; Yardımcı, Y.; Ulusoy, Ozgur; Güdükbay, Uğur; Çetin, A. Enis; Akar, G. B.; Aksoy, Selim (IEEE, 2006)
      A web-based system - consisting of data entrance, access and retrieval modules - is constructed for museums. Internet users that visit the e-museum, are able to view the written and visual information belonging to the ...

    • Early wildfire smoke detection based on motion-based geometric image transformation and deep convolutional generative adversarial networks 

      Aslan, Süleyman; Güdükbay, Uğur; Töreyin, B. U.; Çetin, A. Enis (Institute of Electrical and Electronics Engineers Inc., 2019)
      Early detection of wildfire smoke in real-time is essentially important in forest surveillance and monitoring systems. We propose a vision-based method to detect smoke using Deep Convolutional Generative Adversarial Neural ...

    • An efficient query optimization strategy for spatio-temporal queries in video databases 

      Ünel, G.; Dönderler, M. E.; Ulusoy, Özgür; Güdükbay, Uğur (Elsevier, 2004-09)
      The interest for multimedia database management systems has grown rapidly due to the need for the storage of huge volumes of multimedia data in computer systems. An important building block of a multimedia database system ...

    • Emergency crowd simulation for outdoor environments 

      Oğuz, O.; Akaydın, A.; Yilmaz, T.; Güdükbay, Uğur (Pergamon Press, 2010)
      We simulate virtual crowds in emergency situations caused by an incident, such as a fire, an explosion, or a terrorist attack. We use a continuum dynamics-based approach to simulate the escaping crowd, which produces more ...

    • Extraction of 3D navigation space in virtual urban environments 

      Yılmaz, Türker; Güdükbay, Uğur (IEEE, 2005-09)
      Urban scenes are one class of complex geometrical environments in computer graphics. In order to develop navigation systems for urban sceneries, extraction and cellulization of navigation space is one of the most commonly ...

    • Flexible test-bed for unusual behavior detection 

      Petrás I.; Beleznai, C.; Dedeolğu, Yiğithan; Pards, M.; Kovács L.; Szlávik, Z.; Havasi L.; Szirányi, T.; Töreyin, B. Uğur; Güdükbay, Uğur; Çetin, A.hmet Enis; Canton-Ferrer, C. (ACM, 2007-07)
      Visual surveillance and activity analysis is an active research field of computer vision. As a result, there are several different algorithms produced for this purpose. To obtain more robust systems it is desirable to ...

    • Free-form solid modeling using deformations 

      Güdükbay, Uğur; Özgüç, B. (Pergamon Press, 1990)
      One of the most important problems of available solid modeling systems is that the range of shapes generated is limited. It is not easy to model objects with free-form surfaces in a conventional solid modeling system. Such ...

    • Free-form solid modeling using deformations 

      Güdükbay, Uğur (Bilkent University, 1989)
      One of the most important problems of available solid modeling systems is that the range of shapes generated is limited. It is not easy to model objects with free-form surfaces in a conventional solid modeling system. ...