Now showing items 21-40 of 41

    • An image watermarking algorithm via Zero Assigned Filter Banks 

      Yücel, Zeyep; Özgüler, A. Bülent (IEEE, 2005-12)
      In this paper a new method for digital image watermarking based on Zero Assigned Filter Banks and Embedded Zero Tree Wavelet (EZW) algorithm is presented. An image is partitioned into 128 × 128 subblocks and each block is ...
    • Lossless image compression using an edge adapted lifting predictor 

      Gerek, Ö. N.; Çetin, A .Enis (IEEE, 2005-09)
      We present a novel and computationally simple prediction stage in a Daubechies 5/3 - like lifting structure for lossless image compression. In the 5/3 wavelet, the prediction filter predicts the value of an odd-indexed ...
    • Moving object detection in video by detecting non-Gaussian regions in subbands and active contours 

      Gök, M. Y.; Çetin, A. Enis (IEEE, 2003-09)
      A multi-stage moving object detection algorithm in video is described in this paper. First, the camera motion is eliminated by motion compensation. An adaptive subband decomposition structure is then used to analyze the ...
    • Moving object detection using adaptive subband decomposition and fractional lower-order statistics in video sequences 

      Bagci, A. M.; Yardimci, Y.; Çetin, A. Enis (Elsevier, 2002)
      In this paper, a moving object detection method in video sequences is described. In the first step, the camera motion is eliminated using motion compensation. An adaptive subband decomposition structure is then used to ...
    • Moving region detection in wavelet compressed video 

      Töreyin, B. Uğur; Çetin, A. Enis; Aksay, Anıl; Akhan, M. B. (IEEE, 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 ...
    • Multi-resolution segmentation and shape analysis for remote sensing image classification 

      Aksoy, Selim; Akçay H. Gökhan (IEEE, 2005-06)
      We present an approach for classification of remotely sensed imagery using spatial information extracted from multi-resolution approximations. The wavelet transform is used to obtain multiple representations of an image ...
    • PIR sensörleriyle alev tespiti 

      Töreyin, B. Uǧur; Soyer, E. Birey; Urfalıoǧlu, Onay; Çetin, A. Enis (IEEE, 2008-04)
      Bu bildiride, pasif kızılberisi sensor (PIR) tabanlı bir alev tespit sistemi sunulmaktadır. Önerilen yangın tespit sistemi oda içlerinde kullanılabilir. Kontrolsuz büyüyen yangın alevlerindeki kırpışma, oda içi gündelik ...
    • Plaka tanıma amaçlı alternatif öznitelik çıkarma yaklaşımları 

      Duman, Ş.; Öktem, R.; Çetin, A. Enis (IEEE, 2005-05)
      Otomatik plaka tanıma, güvenlik sistemleri ve trafikle ilgili uygulamalarda önemli yer tutmaktadır. Bu bildiride, plaka tanıma amaçlı farklı öznitelik çıkarma yaklaşımları ele alınmaktadır. Bu amaçla önce hiyerarşik bir ...
    • Polyphase adaptive filter banks for fingerprint image compression 

      Gerek, Ö. N.; Çetin, A. Enis (The Institution of Engineering and Technology, 1998-10-01)
      A perfect reconstruction polyphase filter bank structure is presented in which the filters adapt to the changing input conditions. The use of such a filter bank leads to higher compression results for images containing ...
    • Real-time fire and flame detection in video 

      Dedeoğlu, Yigithan; Töreyin, B. Ugur; Güdükbay, Uğur; Çetin, A. Enis (IEEE, 2005)
      This paper proposes a novel method to detect fire and/or flame by processing the video data generated by an ordinary camera monitoring a scene. In addition to ordinary motion and color clues, flame and fire flicker is ...
    • Real-time smoke and flame detection in video 

      Töreyin, B. Uğur; Dedeoğlu, Yiğithan; Çetin, A. Enis (IEEE, 2005)
      A novel method to detect smoke and/or flame by processing the video data generated by an ordinary camera monitoring a scene is proposed. It is assumed the camera is stationary. Since the smoke is semi-transparent, edges ...
    • A robust system for counting people using an infrared sensor and a camera 

      Erden, F.; Alkar, A. Z.; Çetin, A. Enis (Elsevier BV, 2015)
      In this paper, a multi-modal solution to the people counting problem in a given area is described. The multi-modal system consists of a differential pyro-electric infrared (PIR) sensor and a camera. Faces in the surveillance ...
    • Small moving object detection using adaptive subband decomposition and fractional lower order statistics in video sequences 

      Bağci, A.Murat; Yardımcı, Y.; Çetin, A. Enis (2001-07-08)
      In this paper, a small moving object method detection method in video sequences is described. In the first step, the camera motion is eliminated using motion compensation. An adaptive subband decomposition structure is ...
    • Small moving object detection using adaptive subband decomposition in video sequences 

      Zaibi, Rabi; Çetin, A. Enis; Yardımcı, Y. C. (SPIE, 2000)
      In this paper, a small moving object method detection method in video sequences is described. In the first step, the camera motion is eliminated using motion compensation. An adaptive subband decomposition structure is ...
    • Subband domain coding of binary textual images for document archiving 

      Gerek, Ö. N.; Çetin, A. Enis; Tewfik, A. H.; Atalay, V. (Institute of Electrical and Electronics Engineers, 1999-10)
      In this work, a subband domain textual image compression method is developed. The document image is first decomposed into subimages using binary subband decompositions. Next, the character locations in the subbands and the ...
    • VOC gas leak detection using pyro-electric infrared sensors 

      Erden, Fatih; Soyer, E. B.; Toreyin, B. U.; Çetin, A. Enis (IEEE, 2010)
      In this paper, we propose a novel method for detecting and monitoring Volatile Organic Compounds (VOC) gas leaks by using a Pyro-electric (or Passive) Infrared (PIR) sensor whose spectral range intersects with the absorption ...
    • Volatile organic compound plume detection using wavelet analysis of video 

      Töreyin, B. Uğur; Çetin, A. Enis (IEEE, 2008-10)
      A video based method to detect volatile organic compounds (VOC) leaking out of process equipments used in petrochemical refineries is developed. Leaking VOC plume from a damaged component causes edges present in image ...
    • Watermarking based on discrete wavelet transform and q-deformed chaotic map 

      Behnia, Sohrab; Yahyavi, Mohammad; Habibpourbisafar, Reza (Elsevier Ltd, 2017)
      Hierarchy of one-dimensional ergodic chaotic maps with Tsallis type of q-deformation are studied. We find that in the chaotic region, these maps with q-deformation are ergodic as the Birkhoff ergodic theorem predicts. ...
    • Wavelet based detection of moving tree branches and leaves in video 

      Töreyin, B. Uğur; Çetin, A. Enis (IEEE, 2006-05)
      A method for detection of tree branches and leaves in video is proposed. It is observed that the motion vectors of tree branches and leaves exhibit random motion. On the other hand regular motion of green colored objects ...
    • A wavelet based recursive reconstruction algorithm for linear measurements 

      Orhan, Arıkan (IEEE, 1996)
      A recursive algorithm is proposed to obtain an efficient regularized least squares solution to large linear system of equations which arises in many physical measurement models. The algorithm recursively updates the solution ...