Kurum Yazarı "Topal, Cihan" Bildiri Koleksiyonu İçin Listeleme
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Blind Rectification of Radial Distortion by Line Straightness
Benligiray, Burak; Topal, Cihan (IEEE, 2016)Lens distortion self-calibration estimates the distortion model using arbitrary images captured by a camera. The estimated model is then used to rectify images taken with the same camera. These methods generally use the ... -
Coin Recognition based on Geometric Features
Benligiray, Burak; Çakır, Halil İbrahim; Topal, Cihan; Akınlar, Cüneyt (IEEE, 2015)In this study, it is aimed to count the total amount in an image of coins using machine vision methods. The extrinsic parameters of the camera whose intrinsic parameters are already known are estimated relative to the plane ... -
Coin recognition based on geometric features [Geometrik Öznitelik Tabanli Madeni Para Tanima]
Benligiray, Burak; Çakır, Halil İbrahim; Topal, Cihan; Akınlar, Cüneyt (Institute of Electrical and Electronics Engineers Inc., 2015)In this study, it is aimed to count the total amount in an image of coins using machine vision methods. The extrinsic parameters of the camera whose intrinsic parameters are already known are estimated relative to the plane ... -
Combining Feature-based and Model-based Approaches For Robust Ellipse Detection
Çakır, Halil İbrahim; Benligiray, Burak; Topal, Cihan (IEEE, 2016)Fast and robust ellipse detection is a vital step in many image processing and computer vision applications. Two main approaches exist for ellipse detection, i.e., model-based and feature-based. Model-based methods require ... -
A Comparison of Classification Methods for Local Binary Patterns
Kazak, Nihan; Koç, Mehmet; Benligiray, Burak; Topal, Cihan (IEEE, 2016)Texture recognition is an important tool used for content-based image retrieval, face recognition, and satellite image classification applications. One of the most successful features for texture recognition is local binary ... -
A comparison of classification methods for local binary patterns [Yerel Ikili Örüntüler Için Siniflandirma Yöntemlerinin Karşilaştirilmasi]
Kazak, N.; Koç, Mehmet; Benligiray, Burak; Topal, Cihan (Institute of Electrical and Electronics Engineers Inc., 2016)Texture recognition is an important tool used for content-based image retrieval, face recognition, and satellite image classification applications. One of the most successful features for texture recognition is local binary ... -
Counting Turkish Coins with a Calibrated Camera
Benligiray, Burak; Çakır, Halil İbrahim; Topal, Cihan; Akınlar, Cüneyt (Springer International Publishing Ag, 2015)We present a computer vision application that detects all coins in a test image, classifies each detected coin and computes the total amount. Coins to be counted are assumed to be lying on a flat surface. The application ... -
Dataset augmentation for accurate object detection [Yüksek dogrulukta nesne tespiti için veri kümesi artirma]
Uysal, M. C.; Karapinar, T.; Benligiray, Burak; Topal, Cihan (Institute of Electrical and Electronics Engineers Inc., 2018)Hand detection has many important applications in human-computer interaction. But hand detection is a difficult problem because hand image can vary greatly in images. Vision based hand interfaces require fast and extremely ... -
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 ... -
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 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 ... -
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 ... -
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 -
Sequential Forward Feature Selection for Facial Expression Recognition
Gacav, Caner; Benligiray, Burak; Topal, Cihan (IEEE, 2016)Facial expression recognition is an important computer vision problem with various applications. In this study, we investigate the effectiveness of features derived from facial landmarks in facial expression recognition. ... -
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 ...