Now showing items 1-20 of 21

    • Animation of boiling phenomena 

      Bülbül, Abdullah; Küçüktunç, Onur; Özgüç, Bülent (IEEE, 2008-05)
      Phenomenon of boiling is a challenging topic for computer graphics due to its complex hydrodynamics and formulation. Realistic fluid animations require very heavy three-dimensional fluid flow calculations, and surface ...
    • Bessel functions-based reconstruction of non-uniformly sampled diffraction fields 

      Uzunov, V.; Esmer, G. Bora; Gotchev, A.; Onural, Levent; Özaktaş, Haldun M. (IEEE, 2007)
      A discrete computational model for the diffraction process is essential in forward problems related to holographic TV. The model must be as general as possible, since the shape of the displayed objects does not bear any ...
    • Computer aided frequency planning for the radio and TV broadcasts 

      Altıntaş, A.; Ocalı, O.; Topçu, S.; Tanyer, S. G.; Köymen, H. (Institute of Electrical and Electronics Engineers, 1996-06)
      The frequency planning of the VHF and UHF broadcasts in Turkey is described. This planning is done with the aid of computer databases and digital terrain map. The frequency offset is applied whenever applicable to increase ...
    • Connectivity-guided adaptive lifting transform for image like compression of meshes 

      Köse, Kıvanç; Çetin, Ahmet 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 ...
    • Current research activities on holographic video displays 

      Onural, L.; Yaraş, F.; Kang, H. (S P I E - International Society for Optical Engineering, 2010)
      "True 3D" display technologies target replication of physical volume light distributions. Holography is a promising true 3D technique. Widespread utilization of holographic 3D video displays is hindered by current technological ...
    • Error resilient layered stereoscopic video streaming 

      Tan, Ahmet Serdar; Aksay, A.; Bilen, Ç.; Bozdağı-Akar, G.; Arıkan, Erdal (IEEE, 2007)
      In this paper, error resilient stereoscopic video streaming problem is addressed. Two different Forward Error Correction (FEC) codes namely Systematic LT and RS codes are utilized to protect the stereoscopic video data ...
    • Keyframe reduction techniques for motion capture data 

      Önder, Onur; Güdükbay, Uğur; Özgüç, Bülent; Erdem, T.; Erdem, Ç.; Özkan, M. (IEEE, 2008-05)
      Two methods for keyframe reduction of motion capture data are presented. Keyframe reduction of motion capture data enables animators to easily edit motion data with smaller number of keyframes. One of the approaches achieves ...
    • Motion control for realistic walking behavior using inverse kinematics 

      Memişoǧlu, Aydemir; Güdükbay,Uğur; Özgüç, Bülent (IEEE, 2007-05)
      This study presents an interactive hierarchical motion control system for the animation of human figure locomotion. The articulated figure animation system creates movements using motion control techniques at different ...
    • Multi-SLM holographic display system with planar configuration 

      Yaraş, Fahri; Kang, Hoonjong; Onural, Levent (IEEE, 2010)
      Holographic display system that uses six phase-only spatial light modulators (SLMs) performs holographic reconstructions from the phase-hologram of a point cloud that is extracted from 3D object. The SLMs are tiled as a ...
    • An overview of research in 3DTV 

      Onural, Levent (IEEE, 2007)
      3DTV is regarded by the experts and the general public as the next major step in video technologies. The ghost-like images of remote persons or objects are already depicted in many futuristic movies; both entertainment ...
    • Performance assessment of a diffraction field computation method based on source model 

      Esmer, G. B.; Onural, L.; Ozaktas, H. M.; Uzunov, V.; Gotchev, A. (2008)
      Efficient computation of scalar optical diffraction field due to an object is an essential issue in holographic 3D television systems. The first step in the computation process is to construct an object. As a solution for ...
    • Person search made easy 

      İkizler, Nazlı; Duygulu, Pınar (Springer, Berlin, Heidelberg, 2005)
      In this study, we present a method to extensively reduce the number of retrieved images and increase the retrieval performance for the person queries on the broadcast news videos. A multi-modal approach which integrates ...
    • Piecewise-planar 3D reconstruction in rate-distortion sense 

      İmre, E.; Güdükbay, Uğur; Alatan, A. A. (IEEE, 2007-05)
      In this paper, a novel rate-distortion optimization inspired 3D piecewise-planar reconstruction algorithm is proposed. The algorithm refines a coarse 3D triangular mesh, by inserting vertices in a way to minimize the ...
    • Practical and realistic animation of cloth 

      Bayraktar, Serkan; Güdükbay, Uğur; Özgüç, Bülent (IEEE, 2007-05)
      In this paper, we propose a system for the practical animation of cloth materials. A mass spring based cloth model is used. Explicit time integration methods are used to solve the equations of motion. We update the spring ...
    • Quality comparison and acceleration for digital hologram generation method based on segmentation 

      Kang, H.; Yaraş, F.; Onural, L. (IEEE, 2009)
      A holographic fringe pattern generation methods is based on Fraunhofer diffraction and subsequent segmentation and approximation of the fringe pattern. Several modifications of the original algorithm are already proposed ...
    • Real-time color holographic video display system 

      Yaraş, F.; Kang, H.; Onural, L. (IEEE, 2009)
      A real-time multi-GPU color holographic video display system computes holograms from 3D video of a rigid object. System has three main stages; client, server and optics. 3D coordinate and texture information are kept in ...
    • Reconstruction of scalar diffraction field from distributed data points over 3D space 

      Esmer, G. Bora; Uzunov, V.; Onural, Levent; Gotchev, A.; Özaktaş, Haldun M. (IEEE, 2007)
      Diffraction field computation is an important task in the signal conversion stage of the holographic 3DTV. We consider an abstract setting, where the diffraction field of the desired 3D scene to be displayed is given by ...
    • Research trends in holographic 3DTV displays 

      Onural, L. (Institute of Electrical and Electronics Engineers, 2009)
      Holographic 3DTV and especially displays are attracting more attention. There are SLM based laboratory prototypes. Current images can be viewed from a very narrow angle. Satisfactory holographic displays can be expected ...
    • Robust transmission of multi-view video streams using flexible macroblock ordering and systematic LT codes 

      Argyropoulos, S.; Tan, A. Serdar; Thomos, N.; Arıkan, Erdal; Strintzis, M. G. (IEEE, 2007)
      The transmission of fully compatible H.264/AVC multi-view video coded streams over packet erasure networks is examined. Macroblock classification into unequally important slice groups is considered using the Flexible ...
    • Signal processing for three-dimensional holographic television displays that use binary spatial light modulators 

      Ulusoy, Erdem; Onural, Levent; Özaktaş, Haldun M. (IEEE, 2010)
      One of the important techniques used for three dimensional television (3DTV) is holography. In holographic 3DTV, spatial light modulators (SLM) are used as the display device. SLMs that provide the most limited modulation ...