Now showing items 1-10 of 10

    • 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 ...
    • Detection of microcalcifications in mammograms using higher order statistics 

      Gürcan, M. N.; Yardımcı, Y.; Çetin, A. Enis; Ansari, R. (Institute of Electrical and Electronics Engineers, 1997-08)
      A new method for detecting microcalcifications in mammograms is described. In this method, the mammogram image is first processed by a subband decomposition filterbank. The bandpass subimage is divided into overlapping ...
    • Detection of microcalcifications in mammograms using nonlinear subband decomposition and outlier labeling 

      Gürcan, M. Nafi; Yardımcı, Yasemin C.; Çetin, A. Enis; Ansari, R. (SPIE, 1997-02)
      Computer-aided diagnosis will be an important feature of the next generation picture archiving and communication systems. In this paper, computer-aided detection of microcalcifications in mammograms using a nonlinear subband ...
    • Eye tracking using markov models 

      Bağcı, A. M.; Ansari, R.; Khokhar, A.; Çetin, A. Enis (IEEE, 2004)
      We propose an eye detection and tracking method based on color and geometrical features of the human face using a monocular camera. In this method a decision is made on whether the eyes are closed or not and, using a Markov ...
    • Improved image-based localization using sfm and modified coordinate system transfer 

      Salarian, M.; Iliev, N.; Çetin, A. Enis; Ansari, R. (Institute of Electrical and Electronics Engineers, 2018)
      Accurate localization of mobile devices based on camera-acquired visual media information usually requires a search over a very large GPS-referenced image database collected from social sharing websites like Flickr or ...
    • A multiplication-free framework for signal processing and applications in biomedical image analysis 

      Suhre, A.; Keskin F.; Ersahin, T.; Cetin-Atalay, R.; Ansari, R.; Cetin, A.E. (IEEE, 2013)
      A new framework for signal processing is introduced based on a novel vector product definition that permits a multiplier-free implementation. First a new product of two real numbers is defined as the sum of their absolute ...
    • Near-lossless image compression techniques 

      Ansari, R.; Memon, N.; Ceran, E. (S P I E - International Society for Optical Engineering, 1998)
      Predictive and multiresolution techniques for near- lossless image compression based on the criterion of maximum allowable deviation of pixel values are investigated. A procedure for near-lossless compression using a ...
    • Real-time epileptic seizure detection during sleep using passive infrared sensors 

      Hanosh, O.; Ansari, R.; Younis, K.; Çetin, A. Enis (Institute of Electrical and Electronics Engineers Inc., 2019)
      This paper addresses the problem of detecting epileptic seizures experienced by a human subject during sleep. Commonly used solutions to this problem mostly rely on detecting motion due to seizures using contact-based ...
    • Signal recovery from wavelet transform maxima 

      Çetin, A. Enis; Ansari, R. (IEEE, 1994-01)
      This paper presents an iterative algorithm for signal recovery from discrete-time wavelet transform maxima. The signal recovery algorithm is developed by using the method of projections onto convex sets. Convergence of ...
    • Two-dimensional FIR filters 

      Ansari, R.; Çetin, A. Enis (CRC Press, 2003)
      In this chapter, methods of designing two-dimensional (2-D) finite-extent impulse response (FIR) discrete-time filters are described. Two-dimensional FIR filters offer the advantages of phase linearity and guaranteed ...