Yazar "Topal, Cihan" için listeleme
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Edpf: a Real-Time Parameter-Free Edge Segment Detector With a False Detection Control
Akınlar, Cüneyt; Topal, Cihan (World Scientific Publ Co Pte LTD, 2012)We propose a real-time, parameter-free edge/edge segment detection algorithm based on our novel edge/edge segment detector, the edge drawing (ED) algorithm; hence the name edge drawing parameter free (EDPF). EDPF works by ... -
Enabling peer-to-peer communication for hosts in private address realms using IPv4 LSRR option and IPv4+4 addresses
Topal, Cihan; Akınlar, Cüneyt (Inst Engineering Technology-Iet, 2009)Enabling peer-to-peer (P2P) communication for hosts behind network address translation (NAT) boxes is an important and difficult problem. Existing proposals, for example, UPnP, MIDCOM, TURN, STUN, STUNT, P2PNAT, NATBlaster ... -
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 ... -
Facial expression recognition with FHOG features [FHOG öznitelikleri ile yüz ifadesi tanima]
Gacav, Caner; Benligiray, Burak; Özkan, K.; Topal, Cihan (Institute of Electrical and Electronics Engineers Inc., 2018)Facial expression recognition is a popular computer vision subject that has many applications such as humancomputer interaction and behavior analysis. As for many computer vision problems, lighting and contrast differences ... -
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
Topal, Cihan; Gerek, Ömer Nezih (IEEE, 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. -
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
Benligiray, Burak; Topal, Cihan; Akınlar, Cüneyt; Genç, Yakup (IEEE, 2013)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 ... -
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 ...