Search results for: Cabir Vural

Items from 1 to 13 out of 13 results

article

Reversible video watermarking through recursive histogram modification

Cabir Vural, İbrahim Yıldırım

Multimedia Tools and Applications > 2017 > 76 > 14 > 15513- 15534

In this study, a new reversible video watermarking method is developed. Unlike the existing reversible video watermarking algorithms that are based on motion compensated prediction or interpolation error expansion, motion compensated interpolation errors in the proposed method are watermarked in a totally different manner with the aid of recursive histogram modification algorithm developed recently...

article

Adaptive reversible video watermarking based on motion-compensated prediction error expansion with pixel selection

Cabir Vural, Burhan Baraklı

Signal, Image and Video Processing > 2016 > 10 > 7 > 1225-1232

In this study, a motion-compensated prediction error expansion-based adaptive reversible video watermarking algorithm is proposed. Blocks of motion-compensated frames are classified as smooth and non-smooth according to their prediction errors. Unlike the current reversible video watermarking methods that apply a single watermarking strategy to all blocks, the proposed method uses two different strategies...

article

Blind restoration and resolution enhancement of images based on complex filtering

Fatih Kara, Cabir Vural

Signal, Image and Video Processing > 2016 > 10 > 6 > 1159-1167

Recently, a blind resolution enhancement method that uses a two-dimensional and single-input multiple-output extension of the constant modulus algorithm has been developed for pure translational motion. The method works well in case of low bit depth unobserved true images, but its performance decreases for high bit depth true images. In this work, we propose a refined scheme in which complex representation...

article

Reversible video watermarking using motion-compensated frame interpolation error expansion

Cabir Vural, Burhan Baraklı

Signal, Image and Video Processing > 2015 > 9 > 7 > 1613-1623

In this study, a reversible video watermarking method based on motion-compensated frame interpolation error expansion is developed. Interframe correlation is exploited more efficiently as a result of using motion-compensated frame interpolation error instead of motion-compensated prediction error that is used in the current reversible video watermarking methods. For this reason, on the one hand the...

article

Fast and robust software-based digital phase-locked loop for power electronics applications

Ayhan Ozdemir, Irfan Yazici, Cabir Vural

IET Generation, Transmission & Distribution > 2013 > 7 > 12 > 1435 - 1441

In this study, a fast and fully software-based algorithm for digital phase-locked loop (PLL) is proposed via a new hybrid approach in software and hardware by using an advanced digital signal processor architecture. The proposed algorithm is robust against line disturbances such as phase-angle jump, voltage sag, third harmonic injection, multi-zero crossing and step change in frequency at the input...

chapter

Reversible video watermarking based on histogram modification of motion compansated prediction error

Ibrahim Yildirim, Cabir Vural

2012 20th Signal Processing and Communications Applications Conference (SIU) > 1 - 4

2012 20th Signal Processing and Communications Applications Conference (SIU)

In occluded areas conventional motion estimation techniques lead to high prediction errors. To reduce the prediction error, occlusion detection algorithms should be employed in motion estimation. This paper investigates the influence of the occlusion in a reversible video watermarking technique based on histogram modification of motion compensated prediction error and presents a new reversible video...

chapter

A new reversible video watermarking method based on motion compensated interpolation

Burhan Barakli, Cabir Vural

2012 20th Signal Processing and Communications Applications Conference (SIU) > 1 - 4

2012 20th Signal Processing and Communications Applications Conference (SIU)

Digital watermarking can be defined as embedding information into digital signals. Original signal is distorted as a result of watermarking. The goal in reversible watermaking is to reconstruct the original signal from the watermarked signal without error. In this study a new reversible watermaking algorithm based on motion compensated interpolation error is developed for digital video. The method...

chapter

Blind turbo equalization with EM algorithm and DPSK modulation

Serkan Yakut, Cabir Vural

2010 IEEE 18th Signal Processing and Communications Applications Conference > 661 - 664

2010 IEEE 18th Signal Processing and Communications Applications Conference (SIU 2010)

In digital communication systems, joint equalization and decoding at the receiver is called turbo equalization. Turbo equalization in case of unknown channel is known as blind turbo equalization. In this study, a new blind turbo equalization method is developed for digital communication systems using DPSK modulation. The reason for choosing DPSK is to remove phase ambiguity. Expectation-maximization...

article

Blind source separation and equalization of multiple-input multiple-output FIR channels for chaotic communication systems

Gokcen Cetinel, Cabir Vural

02010 00018th European Signal Processing Conference > 2010 > 1135 - 1139

2010 18th European Signal Processing Conference

In the last two decades, various blind channel equalization algorithms for chaotic communications systems have been developed by exploiting properties peculiar to chaotic signals. Almost in all of these algorithms, however, the propagation channel is assumed to be a single-input singleoutput (SISO) system. As far as we know, there is no study for multiple-input multiple-output (MIMO) unknown channel...

article

Blind equalization of single-input single-output fir channels for chaotic communication systems

Cabir Vural, Gökçen Çetinel

Digital Signal Processing > 2010 > 20 > 1 > 201-211

Recently we have developed a simplified recursive adaptive blind channel equalization method for Single-Input Single-Output (SISO) chaotic communication systems. Even though the simplified recursive algorithm gives superior results compared to the state of the art chaotic blind channel equalization algorithms, it has a very important limitation: convergence of the adaptive algorithm is ensured for...

article

Determination of Sleep Stage Separation Ability of Features Extracted from EEG Signals Using Principle Component Analysis

Cabir Vural, Murat Yildiz

Journal of Medical Systems > 2010 > 34 > 1 > 83-89

In this study, a method was proposed in order to determine how well features extracted from the EEG signals for the purpose of sleep stage classification separate the sleep stages. The proposed method is based on the principle component analysis known also as the Karhunen–Loéve transform. Features frequently used in the sleep stage classification studies were divided into three main groups: (i) time-domain...

article

Recursive blind identification and equalization of FIR channels for chaotic communication systems

Cabir Vural, Gokcen Cetinel

02008 00016th European Signal Processing Conference > 2008 > 1 - 5

2008 16th European Signal Processing Conference

In this study, an adaptive autoregressive (AR) algorithm is proposed for the blind identification and equalization of finite impulse response (FIR) channels for chaotic communication systems. The AR method is derived by minimizing a nonlinear prediction error function that is calculated by exploiting the short time predictability of a chaotic signal. The adaptive AR algorithm requires a recursion...

article

A blind image super-resolution algorithm for pure translational motion

Fatih Kara, Cabir Vural

02006 00014th European Signal Processing Conference > 2006 > 1 - 5

2006 14th European Signal Processing Conference

In almost all super-resolution methods, the blur operator is assumed to be known. However, in practical situations this operator is not available or available only within a finite extend. In this paper, a super-resolution algorithm is presented in which the assumption of availability of the blur parameters is not necessary. It is a two-dimensional and single-input multiple-output extension of the...

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