Browsing by Author "Bagci, A. M."

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    Detection of microcalcifications in mammograms using local maxima and adaptive wavelet transform analysis
    (The Institution of Engineering and Technology, 2002-10-24) Bagci, A. M.; Çetin, A. Enis
    A method for computer-aided diagnosis of microcalcification clusters in mammogram images is presented. Microcalcification clusters which are an early sign of breast cancer appear as isolated bright spots in mammograms. Therefore they correspond to local maxima of the image. The local maxima of the image is first detected and they are ranked according to a higher-order statistical test performed over the subband domain data.
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    Moving object detection using adaptive subband decomposition and fractional lower-order statistics in video sequences
    (Elsevier, 2002) Bagci, A. M.; Yardimci, Y.; Çetin, A. Enis
    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 analyze the motion compensated image. In the "low-high" and "high-low" subimages moving objects appear as outliers and they are detected using a statistical detection test based on fractional lower-order statistics. It turns out that the distribution of the subimage pixels is almost Gaussian in general. On the other hand, at the object boundaries the distribution of the pixels in the subimages deviates from Gaussianity due to the existence of outliers. By detecting the regions containing outliers the boundaries of the moving objects are estimated. Simulation examples are presented. © 2002 Elsevier Science B.V. All rights reserved.