Now showing items 21-34 of 34

    • Lossless image compression by LMS adaptive filter banks 

      Öktem, R.; Çetin, A. Enis; Gerek, O. N.; Öktem, L.; Egiazarian, K. (Elsevier, 2001)
      A lossless image compression algorithm based on adaptive subband decomposition is proposed. The subband decomposition is achieved by a two-channel LMS adaptive filter bank. The resulting coefficients are lossy coded first, ...
    • Multiple-precision MLFMA for efficient and accurate solutions of broadband electromagnetic problems 

      Kalfa, Mert (Bilkent University, 2020-08)
      The multilevel fast multipole algorithm (MLFMA) is a popular full-wave electromagnetic solver that enables the solution of electrically large problems with an extremely large number of unknowns. As with all computational ...
    • Range estimation using simple infrared sensors without prior knowledge of surface parameters 

      Yüzbaşıoğlu, Çağrı; Barshan, Billur (IEEE, 2004)
      This paper describes a new method for range estimation using low-cost infrared sensors. The intensity data obtained with infrared sensors depends highly on the surface properties and the configuration of the sensors and ...
    • Reduction of effects of inactive array elements in phase aberration correction 

      Karaman, Mustafa; Köymen, Hayrettin; Atalar, Abdullah; O'Donnell, M. (IEEE, 1993)
      Phase aberration correction based on time delay estimation via minimization of sum of absolute difference (SAD) between radio frequency (RF) signals of neighboring elements is studied in the presence of missing elements. ...
    • Restoration of error-diffused images using projection onto convex sets 

      Unal G.B.; Çetin, A.E. (2001)
      In this paper, a novel inverse halftoning method is proposed to restore a continuous tone image from a given half-tone image. A set theoretic formulation is used where three sets are defined using the prior information ...
    • Small moving object detection in video sequences 

      Zaibi, Rabi; Çetin, A. Enis; Yardımcı, Y. (IEEE, 2000-06)
      In this paper, we propose a method for detection of small moving objects in video. We first eliminate the camera motion using motion compensation. We then use an adaptive predictor to estimate the current pixel using ...
    • Stereoscopic view-dependent visualization of terrain height fields 

      Güdükbay, Uğur; Yilmaz, T. (IEEE, 2002)
      Visualization of large geometric environments has always been an important problem of computer graphics. In this paper, we present a framework for the stereoscopic view-dependent visualization of large scale terrain models. ...
    • Surface differentiation and position estimation by parametric modeling of signals obtained with infrared sensors 

      Aytaç, Tayfun; Barshan, Billur (IEEE, 2004)
      In this study, low-cost infrared emitters and detectors are used for the recognition of surfaces with different properties in a location-invariant manner. The intensity readings obtained with such sensors are highly dependent ...
    • Synchronization and chaotic masking scheme based on occasional coupling 

      Morgül, Ö. (American Physical Society, 2000)
      Synchronization and a related message transmission scheme using synchronized chaotic systems was presented for discrete-time systems. The scheme was based on occasional coupling of transmitter and receiver systems. The ...
    • Synthetic TEC mapping with kriging and random field priors 

      Sayın, I.; Arıkan, F.; Arıkan, Orhan (IEEE, 2007)
      Total Electron Content (TEC) can be used for analyzing the variability of the ionosphere in space and time. In this study, spatial interpolation is implemented by Kriging and Random Field Priors (RFP), which are widely ...
    • Synthetic TEC mapping with ordinary and universal kriging 

      Sayın, I.; Arıkan, F.; Arıkan, Orhan (IEEE, 2007-06)
      Spatiotemporal variations in the ionosphere affects the HF and satellite communications and navigation systems. Total Electron Content (TEC) is an important parameter since it can be used to analyze the spatial and temporal ...
    • Target differentiation and localization using infrared sensors 

      Aytaç, Tayfun; Barshan, Billur (SPIE, 2003-08)
      We discuss the use of low-cost infrared sensors in differentiating and localizing commonly encountered target primitives in indoor environments, such as planes, corners, edges, and cylinders. Single intensity readings are ...
    • Translation as an integrated approach in elt 

      Erer, Nadide Güher (Bilkent University, 2006)
      This study was designed to investigate the problematic areas in paragraph translation from Turkish into English and to examine the effect of interaction on group work while students translated from Turkish into English ...
    • Yapısal veri belirsizlikleri altında yarışmacı doğrusal MMSE kestirim 

      Vanlı, N. Denizcan; Sayın, Muhammed Ö.; Kozat, Süleyman S. (IEEE, 2014-04)
      Bu bildiride, yapısal veri belirsizlikleri altında doğrusal kestirim problemi incelenmektedir. Maliyet fonksiyonu olarak ortalama karesel hata (MSE) düşünülmüştür ve sınırlı belirsizlikler altında gürbüz bir algoritma ...