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Bharaneswari M.,Vellore Institute of Technology | Arulmozhivarman P.,Vellore Institute of Technology | Tatavarti R.,Gayatri Vidya Parishad Scientific and Industrial Research Center | Senthilnathan K.,Vellore Institute of Technology
2015 IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems, SPICES 2015 | Year: 2015

Synthetic Aperture Radar (SAR) images are inherently degraded due to the coherent nature of the scattering phenomena called speckle. The presence of speckle decreases the utility of the SAR images by reducing the ability to detect ground objects. It affects the quality of the image adversely and hampers the observation of vital and crucial information present in the image. In this paper, we present speckle noise suppression techniques using wavelet decomposition and ICA methods. The algorithms viz., Projection Onto Approximation Coefficients (POAC), Projection Onto Span Algorithm (POSA) and Independent Component Analysis (ICA) are implemented on real SAR images and their results are tabulated. A comparison is made with standard speckle filters such as Lee filter, Frost filters, etc. The performance of our methods is measured in terms of Peak Signal-to-Noise Ratio (PSNR) values. © 2015 IEEE. Source


Tatavarti R.,Gayatri Vidya Parishad Scientific and Industrial Research Center | Arulmozhivarman P.,Vellore Institute of Technology | Kishore M.P.K.,Gayatri Vidya Parishad Scientific and Industrial Research Center | Anil Kumar J.,Gayatri Vidya Parishad Scientific and Industrial Research Center | Sanjay Sarma O.V.,Gayatri Vidya Parishad Scientific and Industrial Research Center
International Journal of Applied Engineering Research | Year: 2013

The impetus for the current research and development towards the realization of a remote monitoring, non-intrusive sensing system for real time monitoring of the environment, stems from the many challenges and constraints faced by the civilian and defence users of conventional technologies. The focus of the current work is on adopting innovative approaches in the design and development of a photonics based system for real time determination of the free air stream velocity, with higher degree of sensitivity and accuracy. Thephotonicssystem can be suitably modified for applicationsonboard automobiles, aircrafts and underwater platforms. © Research India Publications. Source


Tatavarti R.,Gayatri Vidya Parishad Scientific and Industrial Research Center | Arulmozhivarman P.,Vellore Institute of Technology | Anil Kumar J.,Gayatri Vidya Parishad Scientific and Industrial Research Center | Shanmukha Rao S.,Gayatri Vidya Parishad Scientific and Industrial Research Center | Aparna T.,Gayatri Vidya Parishad Scientific and Industrial Research Center
Optics InfoBase Conference Papers | Year: 2013

The development of an optoelectronic sensor for real time monitoring of environmental parameters in atmosphere and ocean is presented here with envisaged applications onboard automobiles, aircrafts and underwater platforms. © OSA 2013. Source

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