Yazar "Gerek, Ömer Nezih" için Bildiri Koleksiyonu listeleme
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A 2 dimensional solar radiation model [2 Boyutlu bir güneş işinim şiddeti modeli]
In this study solar radiation data obtained from Eskisehir region is mathematically modeled using a two dimentional (2D) approach. The approach and model is novel in the literature of solar radiation modeling. The analysis ... -
A 2D representation for analysis and coding of power quality events
Gerek, Ömer Nezih; Ece, Dugan Gökhan (IEEE, 2003)In this work, we demonstrate examples about uses of practical image processing techniques over a new interpretation of power quality event data. Power quality event data are 1D data obtained from a real life system with ... -
A 3D Lifting Based Method Augmented by Motion Compensation for Video Coding
Telceken, Sedat; Görgülü, Şükrü; Gerek, Ömer Nezih (IEEE, 2009)This study introduces a spatio-temporal lifting based algorithm to be used in compression of video signals. The temporal correlation of consecutive frames causes temporal redundancies, which are subject to lifting-like ... -
Biorthogonal Wavelet Vanishing Moment Increment Technique
Kale, Mehmet Cemil; Ataç, Gizem; Gerek, Ömer Nezih (IEEE, 2015)Among several lifting style biorthogonal wavelets, Daubechies and Sweldens wavelets provide the maximum number of vanishing moments for the shortest filter length. In this research we propose a method to increase the number ... -
Biorthogonal wavelet vanishing moment increment technique [Çiftdikgen Dalgaciklar Için Yokolan Momenti Arttirma Tekni?i]
Kale, Mehmet Cemil; Ataç, Gizem; Gerek, Ömer Nezih (Institute of Electrical and Electronics Engineers Inc., 2015)Among several lifting style biorthogonal wavelets, Daubechies and Sweldens wavelets provide the maximum number of vanishing moments for the shortest filter length. In this research we propose a method to increase the number ... -
Cable and Wire Detection System for Aircrafts
Yetgin, Ömer Emre; Gerek, Ömer Nezih (IEEE, 2013)EDlines is a robust and accurate line segment detector that is known to run 11 times faster than the popular (and fastest known) method of LSD, while avoiding necessity of parameter adjustments. In this work, this detector ... -
Cable and wire detection system for aircrafts [Hava araçlari için tel ve kablo tespit sistemi]
Yetgin, Ömer Emre; Gerek, Ömer Nezih (2013)EDlines is a robust and accurate line segment detector that is known to run 11 times faster than the popular (and fastest known) method of LSD, while avoiding necessity of parameter adjustments. In this work, this detector ... -
A Comparison of Corner and Saliency Detection Methods for Power Line Detection
Yetgin, Ömer Emre; Gerek, Ömer Nezih (IEEE, 2017)Issuing an alarm for power lines continues to be an important issue for low altitude aircraft safety. In this study, edge and gradient based methods are applied and compared according to their detection performances (in ... -
A Comparison of Line Detection Methods for Power Line Avoidance in Aircrafts
Yetgin, Ömer Emre; Şentürk, Zekeriya; Gerek, Ömer Nezih (IEEE, 2015)Power lines constitute a great thread for aircraft flight safety. Digital camera based methods consider these power lines as digital lines and edges which are desired to be detected using line and edge detectors. EDLines, ... -
Çevresel Aykırılığa Dayalı Bir Hedef Tespit Algoritması
Automatic target detection algorithms enable in military and civilian applications the detection of low-contrast and spatially small targets that can not be detected by a human operator and remove the requirement of permanent ... -
Detection of disturbances in energy system signals using Gaussian distribution fitness test
Gerek, Ömer Nezih; Ece, Dugan Gökhan (IEEE, 2004)In this work., a method based on higher order statistics (HOS) is proposed to detect disturbances in energy system voltage and current waveforms due to faults and various system events. During the normal operation of the ... -
Detection of disturbances in energy system signals using gaussian distribution fitness test [Enerji Sisitemi Sinyallerinde Bozucularin Gauss Dagilim Uyumlulugu Testi ile Tespiti]
Gerek, Ömer Nezih; Ece, D. G. (2004)In this work, a method based on higher order statistics (HOS) is proposed to detect disturbances in energy system voltage and current waveforms due to faults and various system events. During the normal operation of the ... -
Detection of Voltage Flicker and Voltage Harmonic Using Hilbert Huang Transform
Önal, Yasemin; Gerek, Ömer Nezih; Ece, Doğan Gökhan (IEEE, 2014)Hilbert Huang Transform, which was suggested by Huang and improved by Flandrin and his group, is a new signal processing method. The analysis of nonlinear and non stationary signals can use HHT. This paper deals with the ... -
The Effect of Markov Chain State Size for Synthetic Wind Speed Generation
Hocaoğlu, Fatih Onur; Gerek, Ömer Nezih; Kurban, Mehmet (IEEE, 2008)In this study hourly wind speed time series data of Eskisehir region, Turkey have been used for stochastic generation of wind speed data using the transition matrix approach of the Markov chain process. Previous work on ... -
Effects of temperature and pressure information in a hybrid (fourier series / neural networks) solar radiation model
Solar radiation modeling is a critical step in efficient management of solar energy. In this study, a novel solar radiation modeling procedure is developed with the a-priori information of temperature and pressure values, ... -
An eye-glasses-like wearable eye gaze tracking system [Gözlük tabanli bir göz hareket takip sistemi]
Topal, Cihan; Doğan, Atakan; Gerek, Ömer Nezih (2008)In this study, a new eye tracking system that works by wearing an eye-glasses-like apparatus with attached sensors, is introduced. Due to the working principle of the system, the device is called the Eye Touch system. The ... -
GERİLİM KIRPIŞMASININ HILBERT-HUANG DÖNÜŞÜMÜ İLE ANALİZİ
Önal, Yasemin; Ece, D. G.; Gerek, Ömer Nezih (2011)Hilbert Huang Dönüşümü (HHT) Huang tarafından önerilen, Flandrin ve ekibi tarafından geliştirilen lineer ve durağan olmayan sinyallerin analizinde kullanılan yeni bir sinyal işleme yöntemidir. Bu çalışmada, güç ... -
An Image-Processing Based Automated Bacteria Colony Counter
Ateş, Hüseyin; Gerek, Ömer Nezih (IEEE, 2009)This paper presents an image processing based automated counting system to detect the number of bacteria colonies that develop in Petri dishes of microbiology laboratories. The visible colonies represent the initial number ... -
Improving the Efficiency of Predictive Coders Via Adaptive Multiple Predictor Cooperation
Sar, Hüseyin; Topal, Cihan; At, Nuray; Gerek, Ömer Nezih (IEEE, 2013)Due to the popularity of the prediction concept in time series analysis, predictive coding has been an attractive approach, particularly in lossless image compression. Utilization of prediction in time series not only makes ... -
KISA DÖNEM KIRPIŞMA ŞİDDETİNİN HILBERT-HUANG DÖNÜŞÜMÜ İLE HESAPLANMASI
Bu makalede güç sistemlerinde kısa dönem kırpışma(flicker) şiddeti Pst’yi hesaplamak için Hilbert Huang dönüşümünün (HHT) kullanımına dayalı bir yaklaşım önerilmektedir. HHT lineer ve durağan olmayan sinyallerin analizinde ...