Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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2010 - 20155

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Now showing 1 - 5 of 5
  • Conference Object
    Citation - WoS: 2
    Citation - Scopus: 2
    Çok Bakışlı 3b Geriçatımın Polarizasyon Görüntüleme Kullanımıyla İyileştirilmesi
    (Institute of Electrical and Electronics Engineers Inc., 2014) Ozan, Şükrü; Gümüştekin, Şevket
    Performance of stereo imaging methods, which are used to find depth information of a scene, can be adversely affected by surface reflection properties of subjects in the scene and possible change in relative camera and light source positions. In this study a catadioptric multiview imaging system, which is constructed by using planar mirrors, is proposed. Stereo matching problems which are caused by the specular reflections in the scene are highlighted and it is shown that those problems can be significantly alleviated by using polarization images.
  • Conference Object
    Yapısal Aydınlatma Kullanarak Yüzeylerin Geometrik ve Yansıtıcılık Özelliklerinin Geri Çatımı
    (Institute of Electrical and Electronics Engineers Inc., 2015) Ozan, Şükrü; Gümüştekin, Şevket
    It is not possible to perform a robust and dense surface reconstruction for plain colored surfaces which have insufficient surface features, and for surfaces which have specularity effect because of the material nature by using traditional stereo imaging methods. The proposed surface scanner system in this work makes it possible to get a robust and dense surface reconstruction even for plain colored and/or semi glossy surfaces. Reflection properties of the surface material are also reconstructed to some extent by using the information gathered after scanning process. Moreover, the experimental results are shown.
  • Conference Object
    Citation - Scopus: 3
    Sahne Aydınlatmasında Kullanılan Işık Kaynağının Renklilik Değerlerinin Tek İmge Kullanılarak Kestirimi
    (IEEE, 2011) Ozan, Şükrü; Gümüştekin, Şevket
    In this study, main goal is to estimate scene illuminant chromaticity values for each of the three color channels (red, green, blue). It is found that analysis of the pixel values, which are expressed by dichromatic reflection and inverse-intensity chromaticity space definitions, with appropriate statistical methods gives aproximate values for light source chromaticity within an acceptable error range. Single image of a scene is sufficient for calculations. We saw that chromaticity values of light sources with different colors can be approximately calculated. © 2011 IEEE.
  • Conference Object
    Ölçülmüş Çydf Verilerinin Lafortune Modeli ile Etkin Gösterimi
    (IEEE, 2010) Ozan, Şükrü; Gümüştekin, Şevket
    The bi-directional reflectance distribution function (BRDF) describes the appearance of a material by its interaction with light. In this study, Lafortune BRDF model is fitted to densely sampled measured BRDF data by using Levenberg - Marquardt Algorithm. The obtained results are visualised by a physically based ray tracing software and the proposed method is analysed. ©2010 IEEE.
  • Conference Object
    Citation - Scopus: 2
    Çift Çizgisel Lazerli Bir 3b Ortam Tarayıcısının Kablibrasyonu
    (Institute of Electrical and Electronics Engineers Inc., 2012) Ozan, Şükrü; Gümüştekin, Şevket
    3B lazer tarayıcılar yüzey geometrisinin yakalanması için yaygın olarak kullanılan sistemlerdir. Geleneksel lazer tarayıcı sistemler bir adet lazer ışık kaynağına sahiptir. Bu çalışmada iki adet lazer ışık kaynağına sahip bir 3B lazer tarayıcı ele alınmıştır. Bu tarayıcı özellikle sahnelerdeki örtme etkisinin en küçüklenebilmesini sağlamaktadır. Ancak birden fazla lazer kaynağına sahip lazer tarayıcılar için kalibrasyon önemli bir problem olmaktadır. Çalışmamızda bu sistemlerde karşılaşılan kalibrasyon problemi tanımlanmıştır. Bu problemin çözümü için taranan sahnelerdeki dikgenlik, eş-düzlemsellik bilgileri kullanılmıştır.