Department of Mathematics

&ldquo;IIT Jodhpur is committed to impart quality education to facilitate the creation of qualified, competent and responsible human resources to meet the emerging technological challenges of the world. It is working towards creating an equitable learning platform that is positive, accessible and effective in the face of the modern societal and scientific advancements.

Flexibility in curriculum, in all its academic programs, encompassing elements of teaching, research, creativity, innovation and entrepreneurship is the most unique feature of IIT Jodhpur. The Department of Science and Technology (DST), under the National Mission on Cyber Physical Systems, has identified IIT Jodhpur as a Technology &amp; Innovation Hub in the area of Augmented Reality and Virtual Reality. The institute has also been nominated as the coordinator for the Jodhpur City and Knowledge Cluster by the Office of Principal Scientific Adviser, Government of India.

The sprawling 852-acre IIT Jodhpur campus is a majestic tribute to the deep-rooted diverse cultural heritage of the region. The campus is an architectural masterpiece, which is slated to become an international exemplar of sustainability with net-zero energy, and advanced water and waste management strategies.&rdquo;

IIT Jodhpur

In this paper, a novel, yet simple, watermarking algorithm for image authentication is proposed using fractional wavelet packet transform (FRWPT) via singular value decomposition (SVD). Unlike the traditional watermarking schemes where the watermark is added to the transform coefficients, the proposed algorithm is based on embedding in the singular values (luminance) of the host image. To improve the fidelity, the perceptual quality of the watermarked image and to enhance the security of watermarking, we model an adjustable watermarking algorithm. The meaning of the word adjustable is that the watermark is embedded into the host image by taking two watermark embedding strengths, according to owner and some cryptographic conditions. Finally, a reliable watermark extraction algorithm is developed for the extraction of watermark from the distorted image. The feasibility of this method and its robustness against different kind of attacks are verified by computer simulations and comparison with the existing work. © 2011 Elsevier Ltd. All rights reserved.

World University root node

Computers and Security

A new robust adjustable logo watermarking scheme

In this paper, an efficient yet simple selective encryption technique is proposed based on Saw-Tooth space filling curve, pixels of interest, non-linear chaotic map and singular value decomposition. The core idea of the proposed scheme is to scramble the pixel positions by the means of Saw-Tooth space filling curve followed by the selection of significant pixels using pixels of interest method. Then the diffusion process is done on the significant pixels using a secret image key obtained from non-linear chaotic map and singular value decomposition. Finally, a reliable decryption process is proposed to construct original image from the encrypted image. The analysis and experimental results show that the proposed scheme can achieve various purposes of selective encryption and is computationally secure. © 2012 Elsevier Inc. All rights reserved.

Digital Signal Processing: A Review Journal

Selective image encryption based on pixels of interest and singular value decomposition

In this correspondence paper, the wavelet transform, which is an important tool in signal and image processing, has been generalized by coalescing wavelet transform and fractional random transform. The new transform, i.e., fractional random wavelet transform (FrRnWT) inherits the excellent mathematical properties of wavelet transform and fractional random transform. Possible applications of the proposed transform are in biometrics, image compression, image transmission, transient signal processing, etc. In this correspondence paper, biometrics is chosen as the primary application; and hence, a new technique is proposed for securing fingerprints during communication and transmission over insecure channel. © 2012, IEEE

IEEE Transactions on Systems, Man, and Cybernetics Part A: Systems and Humans

A New Fractional Random Wavelet Transform for Fingerprint Security

In this paper, a wavelet packet transform (WPT)-based robust video watermarking algorithm is proposed. A visible meaningful binary image is used as the watermark. First, sequent frames are extracted from the video clip. Then, WPT is applied on each frame and from each orientation one sub-band is selected based on block mean intensity value called robust sub-band. Watermark is embedded in the robust sub-bands based on the relationship between wavelet packet coefficient and its 8-neighbour (D8) coefficients considering the robustness and invisibility. Experimental results and comparison with existing algorithms show the robustness and the better performance of the proposed algorithm. © 2012 Indian Academy of Sciences.

Fulltext

Sadhana - Academy Proceedings in Engineering Sciences

Wavelet packet transform-based robust video watermarking technique

In this paper, a chaotic encryption framework based on fractional wavelet packet transform (FrWPT) is proposed for securing palmprint data. The palmprint image is first transformed into FrWPT domain with chaotically generated transform orders followed by the alteration of FrWPT coefficients using Hessenberg decomposition. Finally, a reliable decryption scheme is presented to reconstruct original plamprint image from the encrypted data only with the valid keys. Simulated results and analysis validate the efficiency and robustness of the proposed technique. © 2012 Published by Elsevier Ltd.

Procedia Computer Science

A novel chaotic encryption framework for securing palmprint data

Generally, in watermarking techniques the size of the watermark is very small when compared to the host image. On the contrary, this is an attempt in which a new facet in watermarking framework is presented where the size of host image is very small when compared to the watermark image. The core idea of the proposed technique is to first scale up the size of host image equal to the size of watermark using chaotic map and Hessenberg decomposition followed by the redundant wavelet transform. A meaningful gray scale watermark is embedded in the low frequency sub-band at the finest level using singular value decomposition. To prevent ambiguity and enhance the security, a binary watermark is also embedded in loss-less manner which ensures the authenticity of the watermarked image. Finally, a reliable watermark extraction scheme is developed for extracting both the watermarks. The experimental results demonstrate better visual imperceptibility and resiliency of the proposed scheme against intentional or un-intentional variety of attacks. © 2011 Elsevier GmbH. All rights reserved.

AEU - International Journal of Electronics and Communications

A new facet in robust digital watermarking framework

Automatic assessment of image quality in accordance with the human visual system (HVS) finds application in various image processing tasks. In the last decade, a substantial proliferation in image quality assessment (IQA) based on structural similarity has been observed. The structural information estimation includes statistical values (mean, variance, and correlation), gradient information, Harris response and singular values. In this paper, we propose a multiscale image quality metric which exploits the properties of Singular Value Decomposition (SVD) to get approximate pyramid structure for its use in IQA. The proposed multiscale metric has been extensively evaluated in the LIVE database and CSIQ database. Experiments have been carried out on the effective number of scales used as well as on the effective proportion of different scales required for the metric. The proposed metric achieves competitive performance with the structural similarity based state-of-the-art methods. © 2012 IEEE.

Proceedings of the 2012 IEEE International Conference on Multimedia and Expo Workshops, ICMEW 2012

SVD filter based multiscale approach for image quality assessment

In this paper, a novel reference watermarking scheme based on Gyrator transform is presented. The core idea is to segment original image into non-overlapping blocks using zigzag scan followed by the reference image formation considering the spatial frequency of the blocks. Reference image is then transformed in the Gyrator domain. The embedding of the watermark is done by modifying singular values of reference image in Gyrator domain with the singular values of watermark image. The experimental results demonstrates the performance and robustness of the proposed algorithm against a variety of attacks. © 2011 IEEE.

Canadian Conference on Electrical and Computer Engineering

A new robust reference watermarking framework in Gyrator domain

We present our results regarding the modeling and simulation of nano-photonic elements using Discontinuous Galerkin Finite-Element techniques. Just like ordinary finite-element approaches, these methods provide an adaptive spatial resolution. However, in contrast to ordinary finite elements, these methods lead to highly efficient explicit time-stepping schemes. Together with advanced material models, Discontinuous Galerkin methods represent an ideal tool for the quantitative analysis of nano-photonic systems. We demonstrate this by investigating certain prototypical nano-photonic elements such as micro-resonators. © 2011 IEEE.

2011 ICO International Conference on Information Photonics, IP 2011

Discontinuous Galerkin methods for nano-photonics

Dynamical systems are systems that evolve with time. In this paper, we study the dynamics displayed by the combined effect of the join of distinct dynamical systems. The relation, obtained thus, is a set-valued function. We compare the various dynamical properties of such a relation with its individual defining components, as well as its induced counterpart on the hyperspace. Some comparisons can be easily derived, but this study also leads to various questions that have been proposed in this article. © 2010 Topology Proceedings.