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Sadagopan S.,Indian Institute of Information Technology
IT Professional | Year: 2012

IT in India has seen amazing growth, thanks to the liberalization of economic policies, conducive government policies, growth in higher education, and the uptake in entrepreneurship. However, unless Indian education and research (on the supply side), IT companies (on the demand side), and the government and media (enablers) continue to innovate, India might not be able to sustain its current leadership position. This article is part of a special issue on IT in Emerging Markets. © 1999-2012 IEEE. Source

Dutt M.,Indian Institute of Information Technology | Biswas A.,Indian Institute of Science | Bhattacharya B.B.,Indian Statistical Institute
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

The computation of a shortest is othetic path (SIP) between two points in an object is important in various applications such as robotnavigation and VLSI design. However, a SIP between two grid points in a digital object laid on a uniform 2D is othetic square lattice may notbe unique. We assume that each discrete path consists of a sequence ofconsecutive grid edges that starts from the source point and ends at the sink point. In this paper, we present a novel algorithm to calculate the number of such distinct shortest is othetic paths between two given grid points inside a digital object, with time complexity O(S/g2), where S is the total number of pixels in the digital object, and g is the grid size. The number of available SIPs also serves as a metric for shape registration. © Springer International Publishing Switzerland 2015. Source

Verma V.S.,Indian Institute of Information Technology | Kumar Jha R.,Indian Institute of Technology Patna
Signal, Image and Video Processing | Year: 2015

In this paper, a blind watermarking scheme based on significant difference of lifting wavelet transform coefficients has been proposed. The difference between two maximum coefficients in a block is called as significant difference. Embedding of binary watermark has been done based on the largest coefficient of randomly shuffled blocks of CH3 sub-band. This sub-band is quantized using the predefined threshold value by comparing the significant difference value with the average of significant difference value of all blocks. The watermarked image shows no perceptual degradation as the PSNR value exceeds 42 dB. An adaptive-thresholding-based method is used for watermark extraction. In the proposed technique, the benefit of using lifting wavelet over traditional wavelet is the maximum energy compaction property, which helps in resisting different attacks. The simulation results show higher performance of the proposed technique as compared to the similar existing techniques under different geometric and nongeometric attacks such as amplification, median filtering, sharpening, scaling, rotation, Gaussian noise, salt and paper noise, Gaussian filter and JPEG compression. © 2014, Springer-Verlag London. Source

Verma V.S.,Indian Institute of Information Technology | Jha R.K.,Indian Institute of Technology Patna
IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India) | Year: 2015

This paper presents a thorough literature review of robust digital image watermarking applied in diverse applications. Researchers have already done lots of noteworthy work in the field of digital image watermarking. Even though, it is interesting to point out that current methods designed for image integrity may not be perfect. Therefore, the main aim of this paper is to offer a comprehensive reference source to the researchers involved in the design of robust digital image watermarking schemes, regardless of particular application areas. In this article, classification of various watermarking schemes with their properties and applications in the different domain is studied. The general structure of watermarking system, different quantitative matrices, and various categories of attacks are also discussed in this survey. The comparative and quantitative analysis of various watermarking schemes in the different domain will help the researchers in a quick review of existing algorithms. © 2015 by the IETE. Source

Kharche S.,Indian Institute of Technology Bombay | Reddy G.S.,Indian Institute of Technology Bombay | Mukherjee B.,Indian Institute of Information Technology | Gupta R.,Terna Engineering College | Mukherjee J.,Indian Institute of Technology Bombay
Progress In Electromagnetics Research C | Year: 2014

A Multiple Input Multiple Output (MIMO) antenna consisting of two 90° angularly separated semicircular monopoles with steps for Bluetooth, Wi-Fi, Wi-MAX and UWB applications is proposed. Initially, an array of two coplanar circular monopoles with element separation of 25 mm is investigated. In this configuration, mutual coupling is < -5 dB and < -10 dB over 2 GHz-3 GHz and 3 GHz-10.6 GHz, respectively. Mutual coupling is reduced by using 90° angularly separated semicircular monopoles. With semicircular configuration, though the mutual coupling is improved, impedance bandwidth is reduced due to reduction in electrical length. A step like structure is introduced in the semicircular monopoles, and ground plane is modified and extended between the two elements to improve the impedance bandwidth and mutual coupling. Impedance bandwidth from 2.0 GHz-10.6 GHz with S21 < -20 dB and -14 dB is achieved over 3.1 GHz-10.6 GHz and 2.0-3.1 GHz, respectively. The antenna is fabricated using 46 mm × 37 mm RT Duroid substrate. Measurement results agree with the simulation os. Radiation patterns are stable, and correlation coefficient is < 0.02 over 2.0-10.6 GHz. Source

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