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International Conference on Green Computing Communication and Electrical engineering (ICGCCEE)

作者： S. Nimmi V. Saranya Theerthadas R. Gandhiraj Centre for Excellence in Computational Engineering and Networking Amrita Vishwa Vidyapeetham Coimbatore India Centre for Excellence in Computational Engineering and Networking Amrita School of Engineering Amrita Vishwa Vidyapeetham Coimbatore-641112 India Amrita School of Engineering Bangalore Karnataka IN

This paper introduces the basic concepts of real time video streaming using GStreamer through an open source low cost platform - GNU Radio. The GStreamer serves as a base to create many types of multimedia applications such as video editors, streaming media players and media broadcasters. It can help educators to face the challenges of different learning styles and enhance the way in which students can process and use the information. A simple web camera is used to stream the video to the GNU Radio through a GStreamer pipeline. Streamed data can be received and transmitted by a server in real time using Mplayer. The transmitted video is displayed at the receiver block. At the receiver side, buffering is done to store the live video stream. The proposed technique provides a reliable means of sharing real time videos among people using RTL-SDR and USRP.

关键词： Streaming media Receivers Software Radio transmitters Software radio Real-time systems Signal processing

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Automated PCG signal delineation method for heart sound analysis

Automated PCG signal delineation method for heart sound anal...

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National Conference on Communications (NCC)

作者： V. Nivitha Varghees K. I. Ramachandran Centre for Excellence in Computational Engineering and Networking Amrita Vishwa Vidyapeetham University Coimbatore Tamilnadu India

This paper presents an automated PCG signal delineation method for real-time wireless cardiac health monitoring and audio-visual stethoscope applications. The proposed method comprises the steps of: preprocessing, total variation filtering, smooth energy envelope computation, peak-amplitude determination and endpoint determination. The total variation filter is used to smooth out the background noises and preserves the heart sound components. The endpoints of heart sounds (S1, S2, S3, S4 and murmurs) are determined by using smooth energy envelope and hard-thresholding rule. The peaks of the heart sounds are determined by using candidate waveform obtained from Hilbert transformation of smooth envelope. The proposed delineation method is validated by using different clean and noisy pathological and non-pathological PCG signals. Experiments on a large PCG database show that the proposed method achieves an average sensitivity (Se) of 99.56% and positive predictivity (+P) of 96.97%, with the maximum average delineation error of 9.08-msec, 0.483-msec and 7.834-msec for endpoints of heart sounds, peak-locations and durations, respectively.

关键词： Phonocardiography Heart Signal to noise ratio Noise measurement Acoustics

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Recursive Variational Mode Decomposition Algorithm for Real Time Power Signal Decomposition

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Procedia Technology 2015年 21卷 540-546页

作者： Soman K.P. Prabaharan Poornachandran Athira S. Harikumar K. Center for excellence in Computational Engineering and Networking Amrita Vishwa Vidyapeetham Amrita Centre for Cyber Security systems and Networks Amrita Vishwa Vidyapeetham

Conventional methods of signal decomposition are observed to fail in power system applications and computationally intensive algorithms like EMD, VMD, EWT are found to give better performance. The heavy computations associated with them restricts their use in real time applications and stream processing. This paper presents a recursive block processing technique for real time signal decomposition. The use of recursive FFT and the clever initializations of the center frequencies in the existing VMD algorithm helps in reducing the computational complexity and hence speeds up the process. This low complexity algorithm was tested on synthetically generated power signals and the results were observed to be consistent with the existing VMD algorithm.

关键词： Recursive FFT VMD computational complexity power signal decomposition.

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An Optimization Algorithm for Voltage Flicker Analysis

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Procedia Technology 2015年 21卷 589-595页

作者： Athira S. Harikumar K. Soman K.P. Prabaharan Poornachandran Center for excellence in Computational Engineering and Networking Amrita Vishwa Vidyapeetham Amrita Centre for Cyber Security systems and Networks Amrita Vishwa Vidyapeetham

Maintenance of power quality standards is a critical issue in the electrical distribution networks today. Proper quality can be maintained only by continuously monitoring and analyzing the signals of interest so as to identify the sources of distortion. This paper presents an algorithm for analysis of voltage flickers in power signals, a common phenomenon in most of the networks involving heavy loads. The low frequency component responsible for modulating the power signal is extracted using an optimization algorithm. Further the algorithm separately identifies the signals affecting the fundamental component and the harmonics present in the power signal.

关键词： Flicker low freqency envelope optimization.

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Implementation of CDMA in GNU Radio

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Procedia Computer Science 2015年 46卷 981-988页

作者： P. Kavitha K. Meera Mohan R. Surya R. Gandhiraj K.P. Soman Centre for Excellence in Computational Engineering and Networking Amrita Vishwa Vidyapeetham Coimbatore India Department of Electronics and Communication Engineering Amrita Vishwa Vidyapeetham Coimbatore India

This paper proposes the real time implementation of CDMA, a multiple access technique, which brings forth the complete bandwidth usage by spreading the data of same transmitted power, over the whole bandwidth thereby ensuring safe communication and preventing the occurrence of jamming. GNU Radio is a software defined radio which puts experiments into practice using software rather than the normal hardware implementation. Blocks for data spreading, code despreading with and without code tracking are created using Zero Correlation Zone code (ZCZ, a combination of ternary codes that is 1, 0 and -1 which is specified in the program). Thus the real time implementation of CDMA checks the feasibility of an asynchronous multiuser communication among users with good results.

关键词： CDMA Spread Spectrum Zero Correlation Zone(ZCZ) Auto Correlation Cross correlation Software Defined Radio(SDR) GNU Radio Companion(GRC)

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[email protected]: Morpheme Extraction and Lemmatization for Tamil using Machine Learning 14

[email protected]: Morpheme Extraction and Lemmatization for...

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Proceedings of the 6th Annual Meeting of the Forum for Information Retrieval Evaluation

作者： Anand M. kumar K. P. Soman Centre for Excellence in Computational Engineering and Networking Amrita School of Engineering Amrita Vishwa Vidyapeetham Coimbatore-641 112

ISBN: (纸本)9781450337557

This paper presents the method of Morpheme Extraction and lemmatization for Tamil language in Morpheme Extraction Task (MET) of FIRE-2014. Tamil is a morphologically rich and agglutinative language. Such a language needs deeper analysis at the word level to capture the meaning of the word from its morphemes and its categories. In this attempt, the methodology employed to extract Tamil morphemes and lemmas are based on a supervised machine learning algorithm for nouns and verbs and simple suffix stripping for pronouns and proper nouns. Morphemes are extracted for other Part-of-Speech categories using Tamil Part of Speech tagger. In supervised learning, Morphological analyzer problem is redefined as a classification problem. We decompose the problem of noun and verb morpheme extraction into two sub-problems: learning to perform morpheme identification of words in a text, and learning to perform morpheme tagging. In addition to the Morpheme extraction task results of FIRE-2014, we have carried out different experiments to show the effectiveness of the proposed method.

关键词： Lemmatization Machine Learning Morpheme Extraction Support Vector Machines Natural Language Processing

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X-ray image classification based on tumor using GURLS and LIBSVM

X-ray image classification based on tumor using GURLS and LI...

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International Conference on Communications and Signal Processing

作者： A. Pooja R. Mamtha V. Sowmya K. P. Soman Centre for Excellence in Computational Engineering and Networking Amrita School of Engineering Amrita Vishwa Vidyapeetham Amrita Nagar Coimbatore

ISBN: (纸本)9781467385497

In today's world, X-ray imaging is the low cost diagnostic technique when compared with all other medical imaging techniques. In this paper, the proposed method is to classify X-ray images based on tumor. The features are extracted using Singular Value Decomposition (SVD) and classified using different kernels in Library for Support Vector Machine (Lib-SVM) and Grand Unified Regularized Least Squares (GURLS). The proposed method is experimented on X-ray image dataset which is approved by an Oncologist. The effectiveness of proposed method is validated based on classification parameters. The experiment result analysis shows that Gaussian-ho in GURLS provides 95% classification accuracy which is 5% higher than RBF kernel in LibSVM. The performance of the proposed system is validated by an Oncologist.

关键词： Kernel Support vector machines Tumors X-ray imaging Matrix decomposition Feature extraction Libraries

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Low contrast satellite image restoration based on adaptive histogram equalization and discrete wavelet transform

Low contrast satellite image restoration based on adaptive h...

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International Conference on Communications and Signal Processing

作者： P Megha M Swarna V Sowmya K P Soman Amrita School of Engineering Bangalore Karnataka IN Centre for Excellence in Computational Engineering and Networking Amrita School of Engineering Coimbatore India

ISBN: (纸本)9781467385497

Normally images obtained from satellites are of low-contrast type which hides major information carried by the image. Hence, image restoration is necessary in the image processing domain to extract all the information present in the images. The low contrast satellite image restoration based on adaptive histogram equalization combined with Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) is proposed in this paper. The proposed technique is experimented on three different satellite images. The effectiveness of the method introduced in this paper is shown by comparing it against the existing techniques based on gamma correction and histogram equalization combined with DCT and DWT. The comparison is done based on the standard parameters called Peak Signal to Noise Ratio (PSNR) and Standard Deviation. The result and analysis on the basis of PSNR values shows that adaptive histogram equalization combined with DWT is more effective approach compared to adaptive histogram equalization combined with DCT.

关键词： Histograms Adaptive equalizers Discrete wavelet transforms Discrete cosine transforms Satellites Image restoration Standards

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Directional total variation filtering based image denoising method

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International Journal of Computer Science Issues 2012年第2期9卷 161-170页

作者： Karthik, S. Hemanth, V.K. Soman, K.P. Balaji, V. Sachin Kumar, S. Sabarimalai Manikandan, M. Centre for Excellence in Computational Engineering and Networking Amrita Vishwa Vidyapeetham Coimbatore TamilNadu 641 112 India

In this paper, we study signal denoising technique based on total variation (TV) which was reported by Ivan W. Selesnick, Ilker Bayram [1]. Here, we present a directional total variation algorithm for image denoising. In most of the image denoising methods, the total variation denoising is directly performed on the noisy images. In this work, we apply a 1D TV denoising algorithm in sequential manner on the pixel sequence obtained in different orientations including zig-zag, horizontal and vertical. The performance of the proposed method is evaluated using the standard test images and the quality of the denoised images is assessed using various objective metrics such as peak signal to noise ratio (PSNR), structural similarity index metrics (SSIM), visual signal to noise ratio (VSNR). Various experiments show that the proposed method provides promising results with less computational load. © 2012 International Journal of Computer Science Issues.

关键词： Image denoising

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Role of Technology in Utilizing Water as a Resource for Sustainable Development 1st

Role of Technology in Utilizing Water as a Resource for Sust...

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1st International Conference on Data Science, Machine Learning and Applications, 2019

作者： Akshaya, S. Padmashree, Nivedika Simmon, Ajai Geetha, P. Nandanan, Krishna Computer Science Engineering Amrita School of Engineering Amrita Vishwa Vidyapeetham Coimbatore India Mechanical Engineering Amrita School of Engineering Amrita Vishwa Vidyapeetham Coimbatore India Centre for Excellence in Computational Engineering and Networking Amrita School of Engineering Amrita Vishwa Vidyapeetham Coimbatore India Amrita Centre for International Programs Amrita School of Engineering Amrita Vishwa Vidyapeetham Amritapuri India

ISBN: (纸本)9789811514197

Water plays a vital role in preserving and giving us a quality life, which has an impact on the people in day-to-day activities such as household and other productive purposes. In tribal areas where the resource-settings are limited, implementation of an organized water accessible system has an impact on the health and sanitation related problems. There has been an alarming awareness that is essential, to have a public water distribution system possessing a high service reliability among the policy makers in the health centers as well as various higher authorities which implement various programs through organizations which help to facilitate basic requirements of the people in tribal areas. A qualitative study was conducted in Barapita village in the Khordha district of Odisha. The interviews conducted were analyzed using Participatory Rural Appraisal (PRA) tools, AEIOU frameworks, personas and direct observation using the six senses. The cardinal problem statement identified is the lack of any water distribution plan in the village, despite being in the vicinity of one of the largest dams in Odisha (DERAS). The perceptions and experiences shared by ward members of the village suggests the need for the implementation of an organized and sustainable water accessible system. The well- being of the tribal people depends upon efficient watershed management which helps to improve the socio-economic conditions that has a positive impact in the overall development of the village. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Sustainable development

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