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Chanu Y.J.,NERIST | Tuithung T.,NERIST | Manglem Singh Kh.,NIT Manipur
Proceedings - 2012 3rd National Conference on Emerging Trends and Applications in Computer Science, NCETACS-2012 | Year: 2012

The paper describes a short survey on different types of steganography techniques for image in spatial and transform domains and steganalysis techniques for the detection of secret message in the image. The strong and weak points of these techniques are mentioned briefly so that researchers who work in steganography and steganalysis gain prior knowledge in designing these techniques and their variants. One can develop a better steganography technique by analyzing the contemporary steganalysis techniques. © 2012 IEEE.

Manglem Singh K.,NIT Manipur | Chanu Y.J.,NERIST | Tuithung T.,NERIST
International Journal of Computers, Communications and Control | Year: 2014

The paper proposes a novel steganalytic technique for ±k steganography based on noncausal linear predictor using prediction coefficients obtained from the autocorrelation matrix for a block of pixels in the stego-image. The image is divided into equal-size blocks, autocorrelation matrix is found for the block, and the appropriate noncausal linear prediction coefficients is selected to predict all pixels in that block. A pixel is assumed to be embedded with message bit if the absolute difference between the original pixel value and predicted pixel value exceeds the pre-defined threshold. The effectiveness of the proposed technique is verified using different images. © 2006-2014 by CCC Publications.

Singh K.P.,Assam University | Singh K.M.,NIT Manipur | Dewri M.,Assam University
Research in Astronomy and Astrophysics | Year: 2016

On studying some new models of Robertson-Walker universes with a Brans-Dicke scalar field, it is found that most of these universes contain a dark energy like fluid which confirms the present scenario of the expansion of the universe. In one of the cases, the exact solution of the field equations gives a universe with a false vacuum, while in another it reduces to that of dust distribution in the Brans-Dicke cosmology when the cosmological constant is not in the picture. In one particular model it is found that the universe may undergo a Big Rip in the future, and thus it will be very interesting to investigate such models further. © 2016 National Astronomical Observatories, Chinese Academy of Sciences and IOP Publishing Ltd.

Singh T.R.,Assam University | Singh K.M.,NIT Manipur | Roy S.,Assam University
AEU - International Journal of Electronics and Communications | Year: 2013

There is wide interest in multimedia security and copyright protection due the explosion of data exchange in the Internet and the extensive use of digital media. We propose a novel video watermarking scheme based on visual cryptography and scene change detection in discrete wavelet transform domain. We start with a complete survey of the current image and video watermarking technologies, and have noticed that majority of the existing schemes are not capable of resisting all attacks. We propose the idea to use different parts of a single watermark into different scenes of a video for generation of the owner's share from the original video based on the frame mean in same scene and the binary watermark, and generation of the identification share based on the frame mean of probably attacked video. These two shares after stacking can reveal the copyright ownership. Experiments are conducted to verify the robustness through a series of experiments. The security requirement of the proposed algorithm is achieved with the visual cryptography. © 2013 Published by Elsevier GmbH.

Adhikari S.,NIT Manipur | Sinha N.,National Institute of Technology Silchar
International Journal of Computational Science and Engineering | Year: 2012

Flexible alternating current transmission systems (FACTS) devices have been proposed as an effective solution for controlling power flow and regulating bus voltage in electrical power systems, resulting in an increased transfer capability, low system loss and improved stability. However, to what extent the performance can be highly enhanced depends on location and parameters of these devices. Static synchronous series converter (SSSC) is one of the most promising FACTS devices for power flow control. In this paper, we propose an evolutionary optimisation techniques, namely bacteria foraging algorithm (BFA) to select the optimal location and optimal parameters setting of SSSC, which minimises transmission loss, production cost and voltage deviation in power network. Case studies with IEEE-30 bus system are presented to illustrate the applicability of the algorithm. Copyright © 2012 Inderscience Enterprises Ltd.

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