Mohammad Shiva

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In this paper, the authors propose a new procedure for copyright protection by using a bio-inspired wavelet based data hiding approach. The proposed method takes advantage of human visual system (HVS) characteristics to provide better watermarked image quality. It also exploits visual secret sharing (VSS) technique to guarantee the security of the(More)
Although many researches have been devoted to the development of proper watermarking procedures using multiresolution-based transformation, most of these investigations encounter watermarking problems from a specific point of view. Therefore, there is a lack of a general investigation dedicated to the study of parameter selections and their impacts on the(More)
In this paper, we examine some of the challenges concerning error correction and multi-hop communication in wireless sensor networks (WSNs). We consider Bose, Chaudhuri and Hoquenghem (BCH) codes with different codeword lengths and error correction capabilities. In contrast with previous works, that implement coding algorithm in hardware and consequently(More)
In this paper, a model based on autoregressive (AR) method for modeling and generating data in sensor networks is proposed. For this purpose, spatial and temporal correlation of real data is exploited. In addition, estimation of correlation coefficients is used for temporal extension. Availability of a suitable data set is the fundamental need for(More)
In this paper, different schemes of joint blind channel tracking and data detection algorithms based on maximum likelihood (ML) algorithm for time-varying flat fading multiple-input multiple-output (MIMO) channels are introduced. If the channel model is known in the receiver, ML can present the best performance. The performance and tracking behavior of the(More)
In ubiquitous multimedia applications, color images are the basic components of multimedia systems. Although many research has been devoted to develop proper watermarking procedures using multiresolution-based transformation, most of these investigations faced the watermarking problem from a gray scale point of view. In this paper, different color spaces(More)
Aggregating data of several nodes in a wireless sensor networks allows us to accurately monitor a remote environment. The aim of this paper is to introduce a new protocol to reduce overall power consumption, extend network life time, and support mobile nodes in wireless sensor networks. The protocol presented here is EPMPAC (efficient power management(More)
In this work we develop a fast facial expression recognition system with low complexity by proposing a method that does not need face detection for facial characteristics tracking. Moreover, our simple feature selection differentiates between the expressions and accelerates the systempsilas performance. In this system, selected facial feature points from(More)
In this paper, a new channel estimation approach is proposed for ultra-wideband (UWB) communication systems. Performance of UWB systems employing RAKE receivers highly depends on the channel knowledge. Because UWB systems operate in dense multipath environments, channel estimation task becomes more complicated. Some channel estimation methods have been(More)
In this work we develop a fast facial expression recognition system based on cross correlation with low complexity by proposing a method that does not need face detection for facial points tracking. Moreover, our simple feature selection according to the facial characteristics differentiates between the six basic expressions (happiness, surprise, sadness,(More)