Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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Author: search.filters.author.Gümüştekin, ŞevketPublisher: search.filters.publisher.Institute of Electrical and Electronics Engineers Inc.

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Now showing 1 - 9 of 9
  • Conference Object
    Citation - WoS: 2
    Citation - Scopus: 4
    Tek Kamera ve Aynalar Kullanan Bir Görsel Denetleme Sistemi
    (Institute of Electrical and Electronics Engineers Inc., 2004) Gümüştekin, Şevket; Gümüştekin, Şevket; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    In this paper the geometrical properties of an imaging system are investigated. This system uses mirrors to simulate additional cameras. The geometry developed here helps us to capture the images of an object from meaningful viewpoint locations. The imaging system with the desired geometry is realized by adjusting the positions and orientations of mirrors. A special calibration pattern is used for the process of camera calibration which finds the unknown camera parameters and gives feedback about the degree of compliance with the desired geometry. The calibrated camera and its mirror images are used to create a 2D image of an object surface with a uniform geometry. After a pre-defined inner or outer surface of a test object is imaged from different view angles using mirrors, these images are warped and blended in a single image which is used for visual inspection. Hence, the vaguely defined process of inspecting 3D objects and their surface textures is converted to an efficient and well defined process of inspecting 2D images.
  • Conference Object
    Citation - Scopus: 1
    Hava Fotoğraflarından Deniz Kıyılarının Belirlenmesi
    (Institute of Electrical and Electronics Engineers Inc., 2006) Kahraman, Metin; Gümüştekin, Şevket; Gümüştekin, Şevket; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The unique structures of different coastline segments provide distinctive image features for several applications such as oceanography, georeferencing, cartography and autonomous navigation. In this paper, a procedure involving automatic multiresolution coastline extraction is described. Using this method, sea and land textures are segmented utilizing cooccurrence and histogram features of wavelet image representation. The coastlines are identified as the boundaries of the sea regions.
  • Conference Object
    H264/avc ile Sıkıştırılmış Videoda Sahne Değişimi Kestirimi için Bir Yaklaşım
    (Institute of Electrical and Electronics Engineers Inc., 2007) Şimşek, Gökhan; Gümüştekin, Şevket; Gümüştekin, Şevket; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    In this paper, we provide methods to detect abrupt and gradual scene changes on ISO/ITU H264/AVC coded video sequence using macro-block type information. The analysis is realized in compressed domain without the need of full decompression to pixel domain. In order to realize the proposed methods, several video test sequences are constructed in QCIF resolution. The syntax and semantics, parsing, decoding processes of ISO/ITU H264/AVC is followed to realize such analysis and proposed methods are realized using reference software. The application addresses emerging standard ISO/ITU H264/AVC coded video databases as low level tools to realize a video summarization, abstraction or segmentation system.
  • 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; Gümüştekin, Şevket; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    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; Gümüştekin, Şevket; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    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
    Modifiye Bitüm Görüntülerinde Gabor Öznitelikleri ile Doku Analizi
    (Institute of Electrical and Electronics Engineers Inc., 2008) Gümüştekin, Şevket; Gümüştekin, Şevket; Topal, Ali; Şengöz, Burak; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    İnşaat sanayinde, özellikle ulaşım uygulamalarının vazgerçilmez bir malzemesi olan bütün, gelişmekte olan malzeme teknolojilerinin de katkısı ile daha dayanıklı ve giivenilir yol ve yapıların yapılabilmesi için öncelikli bir araştırma konusu olmuştur. Çeşitli polimer katkı maddelerinin bitüme eklenmesi standart bir uygulama haline gelmiştir. Yapım sırasında kalite kontrolünün sağlanması ve denetlenmesi için modifiye bitümlerin test edilmesi büyük önem taşımaktadır. Bu çalışmada mekanik yöntemlere alternatif olan yeni bir yöntem sunulmuştur. Gabor öznitelikleri kullanılarak modifiye bitiim gorüntülerinin dokusal özellikleri incelenmiş; bitüme eklenen katkı maddelerinin ve bu maddelerin hangi oranda eklendiğinin algılanmasınzı büyük ölçüde mümkün olduğu gorülmüştür.
  • Conference Object
    Matching Aerial Coastline Images With Map Data Using Dynamic Programming
    (Institute of Electrical and Electronics Engineers Inc., 2006) Kahraman, Metin; Gümüştekin, Şevket; Gümüştekin, Şevket; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Matching aerial images with map data is an important task in several remote sensing applications such as autonomous navigation, cartography, oceanography. The unique and distinctive shapes of coastlines can be effectively utilized to solve this problem. In this study a completely automatic scheme is proposed to detect coastlines using multiresolution texture analysis and to match the detected coastlines to a map database. A shape matching method using dynamic programming is used and tested on the satellite images of the western coast of Turkey.
  • 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; Gümüştekin, Şevket; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    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.
  • Conference Object
    Active Eye-Glasses With Local Dimming
    (Institute of Electrical and Electronics Engineers Inc., 2011) Özvural, Görkem; Gümüştekin, Şevket; Gümüştekin, Şevket; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The sense of sight provides the most reliable information about the environment. Although the human eye has a wide dynamic range for brightness adaptation, direct exposure to relatively bright light sources wipes out the total visual perception. The most remarkable example of this situation is driving a car at night, while the other cars are coming from the opposite lane with headlights on. In this work, we have proposed and developed a set of LCD equipped active glasses to solve this light adaptation problem. First, the location of the light sources are determined using an on board camera which is assembled in front of the glasses. After processing image data, the locations of the bright light sources are darkened and the disturbing effect of intense light sources is reduced. © 2011 Chamber of Turkish Electric.