Browsing by Author "Güntürk, Bahadır Kürşat"
Now showing items 1-20 of 36
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Altitude optimization of UAVS serving as base stations using deep learning
Shoer, İbrahim (İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2020)It is expected that unmanned aerial vehicles (UAVs) will play a vital role in future communication systems. Optimum positioning of UAVs, serving as base stations can be done through extensive measurements or ray tracing ... -
Analysis of deep learning based path loss prediction from satellite images
Alam, Muhammad Zeshan; Ateş, Hasan Fehmi; Baykaş, Tunçer; Güntürk, Bahadır Kürşat (Institute of Electrical and Electronics Engineers Inc., 2021)Determining the channel model parameters of a wireless communication system, either by measurements or by running electromagnetic propagation simulations, is a time-consuming process. Any rapid deployment of network demands ... -
Blind super-resolution restoration with frame-by-frame nonparametric blur estimation
Qian, Qinchun; Güntürk, Bahadır Kürşat (Springer, 2016)In this paper, we investigate super-resolution image restoration from multiple images, which are possibly degraded with large nonparametric motion blur. The blur kernel for each input image is separately estimated. This ... -
A comprehensive survey on small object detection
Daye, Melik Ahmet (İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2021)The advancement in artificial intelligence and computer vision facilitates object detection for computer-based systems. Object detection is used in a wide spectrum of applications such as face detection, enforcement ... -
Deconvolution based light field extraction from a single image capture
Alam, Muhammad Zeshan; Güntürk, Bahadır Kürşat (IEEE Computer Society, 2018)In this paper, we propose a method to extract light field using a conventional camera from a single image capture. The method involves an offline calibration process, where point spread functions, relating different ... -
Deep learning based prediction of path loss values and distributions from satellite images
Marey, Ahmed Mohamed Nagib İbrahim (İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2021)It is critical to provide rapid deployment of robust and effective outdoor communication systems in today's world, where many seek to provide wireless connection services from aerial grids of drones and balloons, or low ... -
Deep learning-based blind image super-resolution using iterative networks
Yaar, Asfand; Ateş, Hasan Fehmi; Güntürk, Bahadır Kürşat (Institute of Electrical and Electronics Engineers Inc., 2021)Deep learning-based single image super-resolution (SR) consistently shows superior performance compared to the traditional SR methods. However, most of these methods assume that the blur kernel used to generate the ... -
Dual camera based high spatio-temporal resolution video generation for wide area surveillance
Suluhan, Hasan Umut; Ateş, Hasan Fehmi; Güntürk, Bahadır Kürşat (Institute of Electrical and Electronics Engineers Inc., 2022)Wide area surveillance (WAS) requires high spatiotemporal resolution (HSTR) video for better precision. As an alternative to expensive WAS systems, low-cost hybrid imaging systems can be used. This paper presents the usage ... -
Dynamic range and depth of field extension using camera array
Alam, Muhammad Zeshan; Güntürk, Bahadır Kürşat (Institute of Electrical and Electronics Engineers Inc., 2022)Computational imaging aims to extend the capabilities of conventional imaging systems by extracting richer and more meaningful information through multiple captures or by modifying the camera’s sensors and optics. In ... -
Dynamic range enhancement in light field imaging systems
Wahab, Abdul (İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2019)High dynamic range imaging has been an active research area in computational photography over the last two decades. The main reason is that the dynamic range of a traditional camera is typically less than the dynamic range ... -
Extending depth of field and dynamic range from differently focused and exposed images
Qian, Qinchun; Güntürk, Bahadır Kürşat (Springer, 2016)Focus stacking and high dynamic range (HDR) imaging are two paradigms of computational photography. Focus stacking aims to produce an image with greater depth of field (DOF) from a set of images taken with different focus ... -
Extending light field camera capabilities
Mukati, Muhammad Umair (İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)A traditional camera captures an image by projecting a scene on a two-dimensional image sensor plane regardless of the direction light rays coming onto the sensor. A light field camera, in contrast, records light rays in ... -
Extracting sub-exposure images from a single capture through fourier-based optical modulation
Khan, Shah Rez (İstanbul Medipol Üniversitesi Fen Bilimleri Enstitüsü, 2017)Through pixel-wise optical coding of images during exposure time, it is possible to extract sub-exposure images from a single capture. Such a capability can be used for different purposes, including high-speed imaging, ... -
Extracting sub-exposure images from a single capture through fourier-based optical modulation
Khan, Shah Rez; Feldman, Martin; Güntürk, Bahadır Kürşat (Elsevier Science Bv, 2018)Through pixel-wise optical coding of images during exposure time, it is possible to extract sub-exposure images from a single capture. Such a capability can be used for different purposes, including high-speed imaging, ... -
Frequency division multiplexed imaging: A Texas Instruments DMD implementation
Habibkhani, Houman; Güntürk, Bahadır Kürşat; Feldman, Martin; Batur, Aziz Umut (SPIE-Int Soc Optical Engineering SPIE, 2014)Recently we proposed frequency division multiplexed imaging (FDMI), which allows capturing multiple images in a single shot through spatial modulation and frequency domain filtering. This is achieved by spatially modulating ... -
Geniş alan görüntülerinde anomali tespiti
Şahin, Abdullah Hamza; Ateş, Hasan Fehmi; Güntürk, Bahadır Kürşat (Institute of Electrical and Electronics Engineers Inc., 2021)Bu çalışma hava araçlarından çekilmiş geniş alan görüntülerindeki anomalileri tespit etmek ile ilgilidir. Anomali kümesi normal seyrin dışındaki her şey olarak belirlenmiştir. Bu amaçla iki farklı veri seti kullanılmış ve ... -
High dynamic range imaging using a plenoptic camera
Wahab, Abdullah; Alam, Muhammad Zeshan; Güntürk, Bahadır Kürşat (Institute of Electrical and Electronics Engineers Inc., 2017)Light field (or plenoptic) imaging has become an attractive research field due to its post-capture capabilities, including refocusing, perspective change and depth estimation. Micro-lens array based cameras that recently ... -
HM-net: A regression network for object center detection and tracking on wide area motion imagery
Motorcu, Hakkı; Ateş, Hasan Fehmi; Uğurdağ, Hasan Fatih; Güntürk, Bahadır Kürşat (IEEE-Institute of Electrical and Electronics Engineers Inc., 2022)Wide Area Motion Imagery (WAMI) yields high resolution images with a large number of extremely small objects. Target objects have large spatial displacements throughout consecutive frames. This nature of WAMI images makes ... -
Hybrid light field imaging for improved spatial resolution and depth range
Alam, Muhammad Zeshan; Güntürk, Bahadır Kürşat (Springer, 2018)Light field imaging involves capturing both angular and spatial distribution of light; it enables new capabilities, such as post-capture digital refocusing, camera aperture adjustment, perspective shift, and depth estimation. ... -
Hybrid stereo imaging including a light field and a regular camera
Alam, Muhammad Zeshan; Güntürk, Bahadır Kürşat (Institute of Electrical and Electronics Engineers Inc., 2016)Light field imaging involves capturing both angular and spatial distribution of light; it enables new capabilities, such as post-capture digital refocusing, perspective shift, and depth estimation. Micro-lens array (MLA) ...
