Kurum Yazarı "Topal, Cihan" Scopus İndeksli Yayınlar Koleksiyonu İçin Listeleme
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Greedy Search for Descriptive Spatial Face Features
Gacav, Caner; Benligiray, Burak; Topal, Cihan (IEEE, 2017)Facial expression recognition methods use a combination of geometric and appearance-based features. Spatial features are derived from displacements of facial landmarks, and carry geometric information. These features are ... -
A Head-Mounted Sensor-Based Eye Tracking Device: Eye Touch System
Topal, Cihan; Gerek, Ömer Nezih; Doğan, Atakan (Assoc Computing Machinery, 2008)In this study, a new eye tracking system, namely Eye Touch, is introduced. Eye Touch is based on an eyeglasses-like apparatus on which IrDA sensitive sensors and IrDA light sources are mounted. Using inexpensive sensors ... -
Implementing IPv4+4 addressing architecture with IPv4 LSRR option for seamless peer-to-peer (P2P) communication
Topal, Cihan; Akınlar, Cüneyt (Springer-Verlag Berlin, 2007)IPv4 architecture is well entrenched with Network Address Translation (NAT) boxes, which cause well-known problems for Peer-to-Peer (P2P) applications. IPv6 would enable end-to-end connectivity when deployed, but the ... -
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 ... -
Lens Distortion Rectification Using Triangulation Based Interpolation
Benligiray, Burak; Topal, Cihan (Springer Int Publishing Ag, 2015)Nonlinear lens distortion rectification is a common first step in image processing applications where the assumption of a linear camera model is essential. For rectifying the lens distortion, forward distortion model needs ... -
A Low-Computational Approach on Gaze Estimation With Eye Touch System
Topal, Cihan; Günal, Serkan; Kocdeviren, Onur; Doğan, Atakan; Gerek, Ömer Nezih (IEEE-Inst Electrical Electronics Engineers Inc, 2014)Among various approaches to eye tracking systems, light-reflection based systems with non-imaging sensors, e.g., photodiodes or phototransistors, are known to have relatively low complexity; yet, they provide moderately ... -
A novel lossless image compression approach: "Cooperative prediction"
Topal, Cihan; Gerek, Ömer Nezih (2007)Conditional predictive image coders (such as LOCO, CALIC, etc.) split the prediction rule into logical cases (channels) and produce prediction residuals for each case. It is a known fact that the distributions of these ... -
An Occlusion- Resistant Ellipse Detection Method by Joining Coelliptic Arcs
Çakır, Halil İbrahim; Topal, Cihan; Akınlar, Cüneyt (Springer Int Publishing Ag, 2016)In this study, we propose an ellipse detection method which gives prospering results on occlusive cases. The method starts with detection of edge segments. Then we extract elliptical arcs by computing corners and fitting ... -
On the efficiency issues of virtual keyboard design
Topal, Cihan; Benligiray, Burak; Akınlar, Cüneyt (2012)Virtual keyboards are useful tools, which ease effortless entry of textual data and enable typing with alternative input hardware such as a single switch. Early virtual keyboards are designed similar to physical keyboards ... -
A Parallel Huffman Coder on the CUDA Architecture
Rahmani, Habibelahi; Topal, Cihan; Akınlar, Cüneyt (IEEE, 2014)We present a parallel implementation of the widely-used entropy encoding algorithm, the Huffman coder, on the NVIDIA CUDA architecture. After constructing the Huffman codeword tree serially, we proceed in parallel by ... -
Parallelizing edge drawing algorithm on CUDA
Özşen, Özge; Topal, Cihan; Akınlar, Cüneyt (2012)Parallel computing methods are very useful in speeding up algorithms that can be divided into independent subtasks. Traditional multi-processor architectures have limited use due to their high cost and difficulties of their ... -
Pdf sharpening for multichannel predictive coders
Topal, Cihan; Gerek, Ömer Nezih (2006)Predictive coders that split the prediction decision into con-texts depending on the local image behaviour have proved to be practically useful and successful in image coding applications. Such predictive coders can be ... -
Prediction error PDF improvement in multichannel predictive coders [Çok kanalli öngörüye dayali kodlayicilarda öngörü hata dagiliminin i·yileştirilmesi]
Topal, Cihan; Gerek, Ömer Nezih (2006)In this paper, multichannel predictive image coder outputs are investigated within each channel. By obtaining prediction error biases and compensating them in each channel, the total error histogram is sharpened -
Quantification of projective distortion for fiducial markers [Duzlemsel dsaretciler dcin dzdusumsel carpikligin nicelendirilmesi]
The aim of this study is to quantify the projective distortion of candidate quadrilaterals found in a square-framed fiducial marker detection algorithm. Based on the quantified value, candidates can be eliminated in such ... -
A quantitative assessment of edge preserving smoothing filters for edge detection
Gündüz, Hüseyin; Topal, Cihan; Akınlar, Cüneyt (Springer Verlag, 2018)Edge detection algorithms have traditionally utilized the Gaussian Linear Filter (GLF) for image smoothing. Although GLF has very good properties in removing noise and unwanted artifacts from an image, it is also known to ... -
Real-time Edge Segment Detection with Edge Drawing Algorithm
Topal, Cihan; Özşen, Özgür; Akınlar, Cüneyt (IEEE, 2011)Edge Drawing (ED) is an edge detection method that works by computing a set of anchor points, which are most likely to be edge elements, and linking them with a predefined set of rules which we call smart routing. ED can ... -
Realtime circular object detection based on the statistical compactness estimation [İstati·sti·ksel tikizlik kesti·ri·mi·ne dayali gerçek zamanli dai·resel nesne tespi·ti·]
Benligiray, Burak; Topal, Cihan; Akınlar, Cüneyt (2012)Gathering statistical and geometrical information by processing the shape contours is the common way of feature extraction on object detection and recognition studies. Compactness is an important shape descriptor which ... -
A robust CSS corner detector based on the turning angle curvature of image gradients
In this study, we present a new contour-based corner detection method based on the turning angle curvature computed from the contour gradients of the image. In general, curvature is computed with the pixel locations of the ... -
Secure seamless peer-to-peer (P2P) UDP communication using IPv4 LSRR option and IPv4+4 addresses
Topal, Cihan; Akınlar, Cüneyt (Pergamon-Elsevier Science LTD, 2009)The current structure of the Internet, with hosts behind network address translation (NAT) boxes, Causes well-known problems for P2P applications. There are several proposals, e.g., STUN, UPnP, MIDCOM, TURN among others, ... -
Video-based Lane Detection Using a Fast Vanishing Point Estimation Method
Benligiray, Burak; Topal, Cihan; Akınlar, Cüneyt (IEEE, 2012)Lane detection algorithms constitute a basis for intelligent vehicle systems such as lane tracking and involuntary lane departure detection. In this paper, we propose a simple and video-based lane detection algorithm that ...