Browsing Electrical & Electronics Engineering by Author "(ORCID 0000-0003-1126-8259 & YÖK ID 35788) Ercan, Ali"
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3B kamera takibi için eylemsizlik algılayıcılarının birleştirilmesi
Özer, N.; Erdem, Tanju; Ercan, Ali Özer; Eroğlu Erdem, Ç. (IEEE, 2012)It is well known in a Bayesian filtering framework, the use of inertial sensors such as accelerometers and gyroscopes improves 3D tracking performance compared to using camera measurements only. The performance improvement ... -
Analysis of asynchronous cognitive radio system with imperfect sensing and bursty primary user traffic
Ercan, Ali Özer (Springer Science+Business Media, 2016-03)This paper presents a theoretical analysis of the spectrum utilization levels in a cognitive radio system. We assume that the traffic of the primary network is bursty and asynchronous with the secondary network, which ... -
Bağlanırlık aracılığı için kütüphane desteği
Yazıcı, Volkan; Parsa, A.; Burghardt, F. L.; Rabaey, J. M.; Wolisz, A.; Ercan, Ali Özer (IEEE, 2011)The growth of wireless communications has brought about the problem of interference. The realization of future wireless applications that require high data rate and service quality greatly depends on the alleviation of the ... -
Bispectrum estimation using a MISO autoregressive model
Erdem, Tanju; Ercan, Ali Özer (Springer International Publishing, 2016)Bispectra are third-order statistics that have been used extensively in analyzing nonlinear and non-Gaussian data. Bispectrum of a process can be computed as the Fourier transform of its bicumulant sequence. It is in general ... -
Color filters: When “optimal” is not optimal
Trussell, H. J.; Ercan, Ali Özer; Kingsbury, N. G. (IEEE, 2016)It is well known that many more than three or four spectral measurements are required for accurate measurement of color. Previous work has shown seven to ten measurements can yield accurate results on average, but with ... -
Connectivity brokerage: from coexistence to collaboration
Parsa, A.; Ercan, Ali Özer; Malagon, P.; Burghardt, F.; Rabaey, J. M.; Wolisz, A. (IEEE, 2010)The explosive growth in the density of wirelessly connected devices and their traffic load is creating interference and gradually leading to a severe spectrum shortage. Approaches to address this challenge include dynamic ... -
Dağıtık bir openflow kontrol birimi mimarisi
Yazıcı, Volkan; Sunay, Mehmet Oğuz; Ercan, Ali Özer (IEEE, 2012)Considering the modern internet traffic rates, the network architecture is of particular importance as the running services itself. On the other hand, due to the increasing complexity and black-box structure of the available ... -
Design and implementation of dual band microstrip patch antenna for WLAN energy harvesting system
Amjad, Osama; Munir, Syeda Wajiha; Imeci, S. T.; Ercan, Ali Özer (2018-07)Since the demand for self-sustained wireless systems is increasing, there is a trend towards RF energy harvesting. It is a key solution to energize the low power systems such as the Internet of Things (IoT) devices without ... -
Effect of camera-IMU displacement calibration error on tracking performance
Maxudov, Nekruzjon; Ercan, Ali Özer; Erdem, Tanju (IEEE, 2015)Due to their complementary properties, inertial measurement units (IMU) and cameras are used in ego-motion tracking applications. For this, the relative rotation and displacement between the camera and IMU reference frames ... -
Energy sensing strategy optimization for opportunistic spectrum access
Ercan, Ali Özer; Sunay, Mehmet Oğuz (IEEE, 2012-06)This paper introduces a correlator-based energy sensing strategy for opportunistic spectrum access in a slow, flat-fading channel. The correlator provides weighted energy accumulation in time. We assume that the noise ... -
Experimental investigation of the impact on TCP traffic by hidden video-tagged UDP traffic
Çakmak, Kıvanç; Sunay, Mehmet Oğuz; Ercan, Ali Özer; İlhan, C.; Çakar, C.; Sofuoğlu, Ç. (IEEE, 2017)This paper investigates the impact of video-tagged UDP traffic on best-effort TCP traffic in an experimental setup with a novel observation approach. Our setup consists of three 802.11ac nodes in a hidden node topology, ... -
Fusing inertial sensor data in an extended kalman filter for 3D camera tracking
Erdem, Tanju; Ercan, Ali Özer (IEEE, 2015-02)In a setup where camera measurements are used to estimate 3D egomotion in an extended Kalman filter (EKF) framework, it is well-known that inertial sensors (i.e., accelerometers and gyroscopes) are especially useful when ... -
Görünüş temelli̇ örtüşme gözeten 3D nesne taki̇bi̇
Topçu, O.; Ercan, Ali Özer; Alatan, A. (IEEE, 2012)Object tracking is an important element of computer vision algorithms. This problem is difficult due to occlusion, illumination changes and shadows. We propose an appearance based occlusion-aware method for object tracking. ... -
Kamera ve ataletsel ölçüm birimi iç kalibrasyonu
Erdem, Tanju; Ercan, Ali Özer; Aydın, T. (IEEE, 2013)In this paper, we address the problem of internal calibration of a camera and an inertial measurement unit (IMU). The internal calibration of a camera and an IMU requires the determination of the relative orientation and ... -
Object tracking in the presence of occlusions using multiple cameras: a sensor network approach
Ercan, Ali Özer; El Gamal, A.; Guibas, L. J. ( Association for Computing Machinery, 2013)This article describes a sensor network approach to tracking a single object in the presence of static and moving occluders using a network of cameras. To conserve communication bandwidth and energy, we combine a task-driven ... -
Occlusion-aware 3D multiple object tracker with two cameras for visual surveillance
Topçu, O.; Alatan, A. A.; Ercan, Ali Özer (IEEE, 2014)An occlusion-aware multiple deformable object tracker for visual surveillance from two cameras is presented. Each object is tracked by a separate particle filter tracker, which is initiated upon detection of a new person ... -
On sensor fusion for head tracking in augmented reality applications
Ercan, Ali Özer; Erdem, Tanju (IEEE, 2011)The paper presents a simple setup consisting of a camera and an accelerometer located on a head mounted display, and investigates the performance of head tracking for augmented reality applications using this setup. The ... -
On the feasibility of synchronous, retransmission-based cognitive networks
Ercan, Ali Özer; Sunay, Mehmet Oğuz (Elsevier, 2016-01)This paper presents a new, joint Markov chain model for the primary and secondary traffic in a cognitive radio network to assess the feasibility of opportunistic spectrum access for different operational scenarios, validated ... -
Optimization and analysis of WLAN RF energy harvesting system architecture
Munir, Syeda Wajiha; Amjad, Osama; Zeydan, E.; Ercan, Ali Özer (IEEE, 2016)This paper presents the design, analysis and optimization of RF energy harvesting system for WLAN source operating at 2.4 GHz and 5.8 GHz. The system architecture comprises of RF WLAN source, wireless channel, an efficient ... -
Rao-Blackwell parçacık süzgeci ile 3 boyutlu insan takibi
Topçu, O.; Orguner, U.; Alatan, A. A.; Ercan, Ali Özer (IEEE, 2014)Visual tracking has an important place among computer vision applications. Visual tracking with particle filters is a well-known methodology. The performance of particle filters is dependent on efficient sampling of the ...
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