S. Ramachandran

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MOTIVATION The major signal in coding regions of genomic sequences is a three-base periodicity. Our aim is to use Fourier techniques to analyse this periodicity, and thereby to develop a tool to recognize coding regions in genomic DNA. RESULT The three-base periodicity in the nucleotide arrangement is evidenced as a sharp peak at frequency f = 1/3 in the(More)
In this paper, a new technique for the enhancement of color image using multiscale retinex with modified color restoration has been proposed. The basic steps of multiscale retinex algorithm have been analyzed, modified and various operations are performed in an orderly manner. The enhancement effects are visually effective. In addition, it adds true color(More)
A novel architecture suitable for FPGA/ASIC implementation of a video scalar is presented. The scheme proposed here results in enormous savings of memory normally required, without compromising on the image quality. In the present work, SVGA compatible video sequence is scaled up to XGA format. The up scaling operation for a video sequence is carried out by(More)
Iris Recognition (IR) under varying contrast and live-tissues is challenging. This paper proposes two novel techniques viz., Radon Transform Thresholding (RTT) and Gradient-based Isolation (GI). RTT is used to extract the prominent features from the pre-processed image. GI is a pre-processing technique which uses the edge detection property of Gradient(More)
In this paper attempt has been made to study the engineering research scenario in ocean sector across the countries - globally. To understand the research dynamics, the articles appeared in Science Citation Index (SCI) database under Ocean Engineering category in the year 2000 were analyzed to visualize the structure of the field. USA and UK are the major(More)
To delineate the intellectual structure of Antarctic science, the research outputs on Antarctic science have been analyzed for a period of 25 years (1980–2004) through a set of scientometrics and network analysis techniques. The study is based on 10,942 records (research articles, letters, reviews, etc.), published in 961 journals/documents, and retrieved(More)