Now showing items 1-20 of 28

    • 3-D motion estimation and wireframe adaptation including photometric effects for model-based coding of facial image sequences 

      Bozdağı, G.; Tekalp, A. M.; Onural, L. (IEEE, 1994-06)
      We propose a novel formulation where 3-D global and local motion estimation and the adaptation of a generic wireframe model to a particular speaker are considered simultaneously within an optical flow based framework ...
    • Automatic multimedia cross-modal correlation discovery 

      Pan J.-Y.; Yang H.-J.; Faloutsos, C.; Duygulu P. (2004)
      Given an image (or video clip, or audio song), how do we automatically assign keywords to it? The general problem is to find correlations across the media in a collection of multimedia objects like video clips, with colors, ...
    • Correlation Tracking Based on Wavelet Domain Information 

      Ipek H.L.; Yilmaz I.; Yardimci, Y.; Cetin, A.E. (2004)
      Tracking moving objects in video can be carried out by correlating a template containing object pixels with pixels of the current frame. This approach may produce erroneous results under noise. We determine a set of ...
    • Cylindrical model based head pose estimation for drivers 

      Yücel, Z.; Valenti, R.; Sebe, N. (2009)
      The application of action recognition algorithms onto driving safety systems is still an open area of research. In terms of driving safety, identification of head movements present more significant information in comparison ...
    • Dynamic texture detection, segmentation and analysis 

      Toreyin, B. U.; Dedeoglu, Y.; Cetin, A. E.; Fazekas, S.; Chetverikov, D.; Amiaz, T.; Kiryati, N. (2007)
      Dynamic textures are common in natural scenes. Examples of dynamic textures in video include fire, smoke, clouds, trees in the wind, sky, sea and ocean waves etc. In this showcase, (i) we develop real-time dynamic texture ...
    • A fast algorithm for subpixel accuracy image stabilization for digital film and video 

      Eroǧlu Ç.; Erdem, A.T. (1998)
      This paper introduces a novel method for subpixel accuracy stabilization of unsteady digital films and video sequences. The proposed method offers a near-closed-form solution to the estimation of the global subpixel ...
    • Flame detection in video using hidden Markov models 

      Töreyin, B. U.; Dedeoğlu, Y.; Çetin, A. E. (Institute of Electrical and Electronics Engineers, 2005)
      This paper proposes a novel method to detect flames in video by processing the data generated by an ordinary camera monitoring a scene. In addition to ordinary motion and color clues, flame flicker process is also detected ...
    • Gibbs model based 3D motion and structure estimation for object-based video coding applications 

      Onural, Levent; Alatan, A. A. (Springer, 1997)
      Motion analysis is essential for any video coding scheme. A moving object in a 3D environment can be analyzed better by a 3D motion model instead of 2D models, and better modeling might lead to improved coding efficiency. ...
    • Gibbs random field model based 3-D motion estimation from video sequences 

      Alatan, A. A.; Levent, O. (IEEE, 1994)
      In contrast to previous global 3D motion concept, a Gibbs random field based method, which models local interactions between motion parameters defined at each point on the object, is proposed. An energy function which gives ...
    • Hareket geçmişi görüntüsü yöntemi ile Türkçe işaret dilini tanima uygulaması 

      Yalçinkaya, O.; Atvar, A.; Duygulu, P. (Institute of Electrical and Electronics Engineers Inc., 2016)
      İşitme ve konuşma engelli bireylerin toplum içerisinde diger bireylerle sağlıklı şekilde iletişim kurabilmeleri açısından işaret dili çok önemli bir role sahiptir. Ne yazık ki işaret dilinin toplumda sadece duyarlı insanlar ...
    • An improvement to MBASIC algorithm for 3-D motion and depth estimation 

      Bozdağı, G.; Tekalp, A. M.; Onural, L. (IEEE, 1994)
      In model-based coding of facial images, the accuracy of motion and depth parameter estimates strongly affects the coding efficiency. MBASIC is a simple and effective iterative algorithm (recently proposed by Aizawa et al.) ...
    • Knives are picked before slices are cut: Recognition through activity sequence analysis 

      Iscen, A.; Duygulu, P. (Association for Computing Machinery, 2013)
      In this paper, we introduce a model to classify cooking activities using their visual and temporal coherence information. We fuse multiple feature descriptors for fine-grained activity recognition as we would need every ...
    • A line based pose representation for human action recognition 

      Baysal, S.; Duygulu, P. (2013)
      In this paper, we utilize a line based pose representation to recognize human actions in videos. We represent the pose in each frame by employing a collection of line-pairs, so that limb and joint movements are better ...
    • Moving region detection in wavelet compressed video 

      Töreyin, B.U.; Çetin, A.E.; Aksay, A.; Akhan, M.B. (2004)
      In many vision based surveillance systems the video is stored in wavelet compressed form. In this study, an algorithm for moving object and region detection in video that is compressed using a wavelet transform (WT) is ...
    • Object rigidity and reflectivity identification based on motion analysis 

      Zang, D.; Schrater P.R.; Doerschner, Katja (IEEE, 2010)
      Rigidity and reflectivity are important properties of objects, identifying these properties is a fundamental problem for many computer vision applications like motion and tracking. In this paper, we extend our previous ...
    • Piecewise-planar 3D reconstruction in rate-distortion sense 

      İmre, E.; Güdükbay U.; Alatan, A. A. (2007)
      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 ...
    • Rate-distortion based piecewise planar 3D scene geometry representation 

      Imre, E.; Alatan, A.A.; Güdükbay, U. (2006)
      This paper proposes a novel 3D piecewise planar reconstruction algorithm, to build a 3D scene representation that minimizes the intensity error between a particular frame and its prediction. 3D scene geometry is exploited ...
    • Rate-distortion optimized layered stereoscopic video streaming with raptor codes 

      Tan, A. Serdar; Aksay, A.; Bilen, C.; Bozdağı-Akar, G.; Arıkan, Erdal (IEEE, 2007)
      A near optimal streaming system for stereoscopic video is proposed. Initially, the stereoscopic video is separated into three layers and the approximate analytical model of the Rate-Distortion (RD) curve of each layer is ...
    • 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 ...
    • Searching video for complex activities with finite state models 

      İkizler, N.; Forsyth, D. (2007)
      We describe a method of representing human activities that allows a collection of motions to be queried without examples, using a simple and effective query language. Our approach is based on units of activity at segments ...