Informatics Publishing Limited

K. V. V. S. Gupta ¹, G. N. Satapathi ¹, A. Rajesh ¹, P. Srihari ¹

Affiliations
1 Dadi Institute of Engineering and Technology, IN

Abstract

In this paper, we propose a moving object extraction technique for MPEG coded data directly. It is a change based motion object extraction approach, which discriminates background and moving objects by means of the higher-order statistics (HOS) performed on the inter frame differences of DC image. The DC image is partly decoded picture from the compressed video for the rapid reconstruction of image data. In order to employ an optimal threshold in moving object detection stage, the background is detected by the Moment-preserving thresholding technique for each frame. Based on the background statistic, the proportion of background variance is employed to extract the final object mask by comparison the fourth moment measure and the variance. Experimental results have demonstrated that the proposed approach worked efficiently and shown a robust result for object extraction in compressed video.

Keywords

Dc Image, Variance, Mean, Frame, Moment.

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N. Venkateswarlu ¹, D. Tirumala Rao ², G. N. Satapathi ¹, P. Srihari ¹

Affiliations
1 Dadi Institute of Engineering and Technology, IN
2 GMRIT, Rajam, IN

Abstract

A numerical method for analysis of new types of Complementary direct sequence complex signals which have synthesized and compare with well - know code sequences like Barker and Golay complementary codes. Build on the autocorrelation and ambiguity functions of signals, the numerical method estimates the volume of side lobes separately for each signal. The results obtained show, that the signals, which have a low volume of side lobes, are complementary codes.

Keywords

Ambiguity Function, PSL, ISL, Complementary Codes.

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Kakarla Deepti ¹, P. Srihari ², Manjunadh Achari ³

Affiliations
1 Department of ECE, Vasavi College of Engineering, Hyderabad – 500 031, Telangana, IN
2 Department of ECE, Geethanjali College of Engineering and Technology, Hyderabad - 501301, Telangana
3 Department of ECE, Gitam University, Hyderabad - 500041, Telangana, IN

Abstract

Background/Objectives: It is necessary to keep the photovoltaic panels cleaned regularly to gain the maximum power output. It is inexorable that things like bird droppings, dust, pollen, leafs and mud will collect and deposit on photovoltaic modules that reduces the efficiency of these panels, by as much as 30%. This research paper presents a design and development of an automatic cooling and dust control mechanism for increasing the conversion efficiency of photovoltaic panels. Methods/Statistical Analysis: The design consists of a wiper and water sprinkler mechanism connected to the solar panel through relay driver circuit and is interfaced with PIC16F72 microcontroller. The tracking of maximum power is done through incremental conductance MPP algorithm and the duty cycle of PWM output is controlled through Cuk Converter. Wiper and water sprinkler were run through motors and the driving source for motors is battery that is charged from the solar panel connected. The operation is controlled by programming PICF72 using PIC C-compiler. The experimental method involved finding the voltage and current readings of the panel output and comparing the efficiency in the power output before and after cleaning on timely basis. Findings: The experimental method involved finding the voltage and current readings of the panel output and comparing the efficiency in the power output before and after cleaning on timely basis. The wiper is programmed to move for every hour and water is sprinkled for every six hours. The results prove that by adopting Cuk Converter compared to other converters. The design also aims on providing an automatic mechanism which reduces a huge human effort and is cost effective. Results have proved that the conversion efficiency is improved up o 45%. Application/Improvement: The design also aims on providing an automatic mechanism which reduces a huge human effort and is cost effective. Results have proved that the conversion efficiency is improved up to 45%.

Keywords

Cuk Converter, Maximum Power Point Tracking, PIC16F72 Controller, Sprinkler Interface, Wiper Interface.

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N. Shribala ¹, P. Srihari ², B. C. Jinaga ³

Affiliations
1 Department of ECE, Bhoj Reddy Engineering College for Women, Hyderabad, A.P, IN
2 Department of EIE, GITAM, Hyderabad, A.P, IN
3 Department of ECE, JNTUH, Hyderabad, A.P, IN

Abstract

Error Correcting Codes play an important role in maintaining a reliable link in the communication system. Error correcting codes are used to protect the system against errors introduced due to various reasons in the transmission media. These Codes enable the communication systems to have a reliable transmission over noisy channels. Cognitive Radio is a creative technology proposed to increase spectrum usage by allowing cognitive users to use the unused spectrum in changing environments. The Cognitive Radio (CR) technology will allow a group of potential users to identify and access available spectrum resources provided that the interference to the users for whom the band has been licensed is kept below a prescribed level. During the spectrum allocation for Primary user and cognitive user, lot of information may be lost due to random and burst errors and power issues. A secondary user (SU) can improve its data rate by increasing its transmission bandwidth while operating at low power and without creating destructive interference to the primary users (PUs). To achieve the acceptable error rate Forward error correction (FEC)control is done where received error rate is Controlled via Forward Transmission only. In this paper, a new Systematic Double Error Correcting Linear Block Code is proposed called the Data Negation codes. The performance of Data Negation codes for cognitive Radio is described in terms of Probability of undetected errors and also comparison of the proposed code is done with the existing Systematic Double error correcting Linear Block Code.

Keywords

Cognitive Radios, Software Defined Radios, Primary User, Cognitive User and Spectrum Sensing.

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