Now showing items 1-20 of 46

    • Attributed relational graphs for cell nucleus segmentation in fluorescence microscopy images 

      Arslan, S.; Ersahin, T.; Cetin-Atalay, R.; Gunduz-Demir, C. (IEEE, 2013)
      More rapid and accurate high-throughput screening in molecular cellular biology research has become possible with the development of automated microscopy imaging, for which cell nucleus segmentation commonly constitutes ...
    • Automated detection and enhancement of microcalcifications in mammograms using nonlinear subband decomposition 

      Ansari, R.; Gürcan, M. Nafi; Yardımcı, Yasemin; Çetin, A. Enis (IEEE, 1997)
      In this paper, computer-aided detection and enhancement of microcalcifications in mammogram images are considered. The mammogram image is first decomposed into subimages using a `subband' decomposition filter bank which ...
    • Automated detection of objects using multiple hierarchical segmentations 

      Akçay H. Gökhan; Aksoy, Selim (IEEE, 2007-07)
      We introduce an unsupervised method that combines both spectral and structural information for automatic object detection. First, a segmentation hierarchy is constructed by combining structural information extracted by ...
    • Automatic detection of geospatial objects using multiple hierarchical segmentations 

      Akçay, H. G.; Aksoy, S. (Institute of Electrical and Electronics Engineers, 2008-07)
      The object-based analysis of remotely sensed imagery provides valuable spatial and structural information that is complementary to pixel-based spectral information in classification. In this paper, we present novel methods ...
    • Automatic segmentation of colon glands using object-graphs 

      Gunduz Demir, C.; Kandemir, M.; Tosun, A. B.; Sokmensuer, C. (Elsevier BV, 2010)
      Gland segmentation is an important step to automate the analysis of biopsies that contain glandular structures. However, this remains a challenging problem as the variation in staining, fixation, and sectioning procedures ...
    • Background subtraction with a moving camera 

      Topçu O.; Kalem, Aslıhan; Esen, E. (IEEE, 2013)
      Moving object segmentation with a nonstationary camera is a difficult problem due to the motion of both camera and the object. A moving object segmentation method is proposed in this work to be used in pan-tilt-zoom (PTZ) ...
    • Canlı hücre bölütlemesi için gözeticili öğrenme modeli 

      Koyuncu, Can Fahrettin; Durmaz, İrem; Çetin-Atalay, Rengül; Gündüz-Demir, Çiğdem (IEEE Computer Society, 2014-04)
      Automated cell imaging systems have been proposed for faster and more reliable analysis of biological events at the cellular level. The first step of these systems is usually cell segmentation whose success affects the ...
    • Cartilage endplate thickness variation measured by ultrashort echo-time MRI is associated with adjacent disc degeneration 

      Berg-Johansen, B.; Han, M.; Fields, A. J.; Liebenberg, E. C.; Lim, B. J.; Larson, P. E. Z.; Gündüz Demir, Çiğdem; Kazakia, G. J.; Krug, R.; Lotz, J. C. (Lippincott Williams & Wilkins, 2018)
      Study design: A magnetic resonance imaging study of human cadaver spines. Objective: To investigate associations between cartilage endplate (CEP) thickness and disc degeneration. Summary of background data: Damage to the ...
    • Cepstrum based method for moving shadow detection in video 

      Cogun, Fuat; Çetin, A. Enis (Springer, 2010-09)
      Moving shadows constitute problems in various applications such as image segmentation and object tracking. Main cause of these problems is the misclassification of the shadow pixels as target pixels. Therefore, the use of ...
    • Detection of compound structures by region group selection from hierarchical segmentations 

      Akçay, H. Gökhan; Aksoy, Selim (IEEE, 2016-07)
      Detection of compound structures that are comprised of different arrangements of simpler primitive objects has been a challenging problem as commonly used bag-of-words models are limited in capturing spatial information. ...
    • Detection of heterogeneous structures using hierarchical segmentation 

      Akçay, H. Gokhan; Aksoy, Selim (IEEE, 2011)
      We present an unsupervised hierarchical segmentation algorithm for detecting complex heterogeneous image structures that are comprised of simpler homogeneous primitive objects. The first step segments primitive objects ...
    • Dynamic texture detection, segmentation and analysis 

      Töreyin, Behçet Uğur; Dedeoğlu, Yiğithan; Çetin, A. Enis; Fazekas, S.; Chetverikov, D.; Amiaz, T.; Kiryati, N. (ACM, 2007-07)
      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 ...
    • Estimation of depth fields suitable for video compression based on 3-D structure and motion of objects 

      Alatan, A. A.; Onural, L. (Institute of Electrical and Electronics Engineers, 1998-06)
      Intensity prediction along motion trajectories removes temporal redundancy considerably in video compression algorithms. In three-dimensional (3-D) object-based video coding, both 3-D motion and depth values are required ...
    • Fall detection using single-tree complex wavelet transform 

      Yazar, A.; Keskin, F.; Töreyin, B. U.; Çetin, A. Enis (Elsevier, 2013)
      The goal of Ambient Assisted Living (AAL) research is to improve the quality of life of the elderly and handicapped people and help them maintain an independent lifestyle with the use of sensors, signal processing and ...
    • Finding compound structures in images using image segmentation and graph-based knowledge discovery 

      Zamalieva, Daniya; Aksoy, Selim; Tilton J. C. (IEEE, 2009-07)
      We present an unsupervised method for discovering compound image structures that are comprised of simpler primitive objects. An initial segmentation step produces image regions with homogeneous spectral content. Then, the ...
    • Fuzzy color histogram-based video segmentation 

      Küçüktunç, O.; Güdükbay, Uğur; Ulusoy, Özgür (Academic Press, 2010)
      We present a fuzzy color histogram-based shot-boundary detection algorithm specialized for content-based copy detection applications. The proposed method aims to detect both cuts and gradual transitions (fade, dissolve) ...
    • Gauss tabanlı modelleme kullanarak canlı hücre görüntülerinin öğreticisiz bölütlenmesi 

      Arslan, Salim; Durmaz, İrem; Çetin-Atalay, Rengül; Gündüz-Demir, Çiğdem (2011-04)
      The first step of targeted cancer drug development is to screen and determine drug candidates by in vitro measuring the effectiveness of the drugs. The tests developed for this purpose can be time consuming due to their ...
    • Graph run-length matrices for histopathological image segmentation 

      Tosun, A. B.; Gunduz Demir, C. (Institute of Electrical and Electronics Engineers, 2011-03)
      The histopathological examination of tissue specimens is essential for cancer diagnosis and grading. However, this examination is subject to a considerable amount of observer variability as it mainly relies on visual ...
    • Hierarchical segmentation of complex structures 

      Akçay, H. Gökhan; Aksoy, Selim; Soille P. (IEEE, 2010)
      We present an unsupervised hierarchical segmentation algorithm for detection of complex heterogeneous image structures that are comprised of simpler homogeneous primitive objects. An initial segmentation step produces ...
    • Image segmentation with unified region and boundary characteristics within recursive shortest spanning tree 

      Esen, E.; Alp, Yaşar Kemal (IEEE, 2007)
      The lack of boundary information in region based image segmentation algorithms resulted in many hybrid methods that integrate the complementary information sources of region and boundary, in order to increase the segmentation ...