IOSR Journal of VLSI and Signal Processing (IOSR-JVSP)

vol1-Issue2

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Paper Type : Research Paper
Title : Removal of Noise in Images Using Modified Decision Based Unsymmetric Trimmed Median Filter with FPGA Implementation
Country : India
Authors : Chaitanya Bethina , M.Premkumar
doi : 10.9790/4200-0120108       logo
ABSTRACT:We propose a new technique for digital image restoration, in this the noise free and noisy pixels are classified based on empirical multiple threshold values. Then the median filtering technique is applied. So that noise free pixels are getting preserved and only noisy pixels get restored. A novel decision-based filter, called the multiple thresholds switching (MTS) filter, is used to restore images corrupted by salt-pepper impulse noise. The filter is based on a detection-estimation strategy. At high noise densities, their performance is poor. A new algorithm to remove high-density salt and pepper noise using modified Decision Based Unsymmetric Trimmed Median Filter (DBUTMF) is proposed. When all the pixel values are 0's and 255's then the noise pixel is replaced by mean value of all the elements present in the selected window. The performance of our proposed algorithm will be analyzed based PSNR and MSE values.
Keywords:Median filter, salt and pepper noise, unsymmetrical trimmed median filter
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Paper Type : Research Paper
Title : An Approach to Medical Image Compression Using Filters Based On Lifting Scheme
Country : India
Authors : Anju B,Manimurugan S
doi : 10.9790/4200-0120916       logo
ABSTRACT:Image compression plays an important role in the compression of medical images. Medical imagings are mainly used for diagnosis of diseases and surgical planning. Medical images are usually stored digitally. Medical Image compression plays an important role in telematics especially in telemedicine. It is necessary that medical images need to be compressed for reliability to be transmitted. In the medical image compression diagnosis is effective only when the compressed image preserves all the information of the original image. This results in a lossless compression technique. While lossy compression techniques, are more efficient in terms of storage and transmission needs but there is no warranty that they can preserve the characteristics needed in medical image processing and diagnosis. Compression plays an important role as medical imaging moves to film less imaging.CTI or MRI medical imaging are used nowadays which can produce pictures of the human body in digital form. The lifting scheme is used for the design of both orthogonal and bi-orthogonal filters .It is implemented for the orthogonal filters using two lifting steps .The performance of the proposed filters are then compared with the conventional filters in terms of compression ratio, PSNR etc. The bi-orthogonal filters are implemented using the SPIHT algorithm replacing the EZW coding for image compression. SPIHT algorithm requires fewer bits to capture the same amount of information when compared with EZW proposed.
Keywords: Bi-orthogonal wavelet transforms, Lifting scheme, SPIHT algorithm, EZW coding, orthogonal filters.
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Paper Type : Research Paper
Title : An Area efficient and more accurate DA-based DCT with more compression rate
Country : India
Authors : Ashok Kumar Gulla, K.Rajasekhar
doi : 10.9790/4200-0121720       logo
ABSTRACT:In this paper, a scheme for the design of pipeline architecture for a real-time computation of the 2- D DCT has been presented. The objective has been to achieve a low computation time by maximizing the operational frequency and minimizing the number of clock cycles required for the DCT computation, which, in turn, have been realized by developing a scheme for enhanced inter- and intra stage parallelisms for the pipeline architecture. it is most efficient to map the overall task of the DCT computation to only two pipeline stages, i.e., one for performing the task of the level-1DCT computation and the other for performing that of all the remaining decomposition levels. In view of the fact that the amount and nature of the computation performed by the two stages are the same, their internal designs ought to be the same. There are two main ideas that have been employed for the internal design of each stage in order to enhance the intra stage parallelism. The first idea is to decompose the filtering operation into two subtasks that operate independently on the evenand odd-numbered input samples, respectively. This idea stems from the fact that the DCT computation is a twosub band filtering operation, and for each consecutive decomposition level, the input data are decimated by a factor of two.
Keywords: DCT, Pipeline Architecture, 2-D DCT, Intra Stage Parallelisms, Filtering
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Paper Type : Research Paper
Title : Implementation of A Low Power Low Complexity VLSI Architecture for DSSS Signal Transmission and Reception.
Country : India
Authors : D.Karunakar Reddy , Mekala Ramarao, Dr. T. Satya Savitri
doi : 10.9790/4200-0122129       logo
ABSTRACT:In this paper, a new approach to design VLSI architecture for DSSS is proposed and implemented. In this we aimed towards designing a low power and low complexity architecture. An extremely lucid technique is implemented in Generating the Pseudo Random Sequence, which is the principal component in the design. The various blocks of the design like encoder, decoder, linear feedback shift register etc., are realized using low power VLSI components with an ease of low complexity approach. The Design is implemented on XA9536XL CPLD using XILINX ISE simulator and XILINX XST synthesizer. The results reveal that the power consumption, number of slice registers and other combinational circuits are less compared to the existing architectures.
Keywords: DSSS, low power VLSI, VHDL, Pseudo Random sequence, CPLD, Linear feedback shift register.
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Paper Type : Research Paper
Title : Edge Enhancement and Its Applications
Country : India
Authors : Kanika Gupta, Harjeet Singh
doi : 10.9790/4200-0123034       logo
ABSTRACT:We describe an automated edge enhancement procedure that operates in conjunction with clustereddot dithering, edge weighted unsharp masking, compound anisotropic diffusion etc. The goal is to make weak edges more noticeable and to give the strong edges in the half toned image a sharper and more natural appearance. Unsharp masking that is widely used for image enhancement amplifies image contrast by adding the high frequency component that is obtained by a linear high pass filter from an input image. To preserve image features, the anisotropic diffusion is governed by a local co-ordinate transformation. Experimental results show that edge enhancement is successful in improving the appearance of the text, line art and natural scenes. Also real ultrasonic images indicate effective preservation of edges and local details. Edge enhancement enhances edges in image with natural transition and sharp visual quality.
Keywords: Anisotropic diffusion, augmented Vision, Dyadic wavelet transform, Image edge enhancement, spatial phase filter
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Paper Type : Research Paper
Title : Design, Analysis and Simulation of High Performance Low Power 8-Bit ALU at Gate and Layout Levels
Country : India
Authors : Venkatesh Kumar N, Amritha Mulay V, Mujeeb Ulla Jeelani, Anoop S Shandilya
doi : 10.9790/4200-0123540       logo
ABSTRACT:In this work, the demand is to design an 8-bit ALU and perform analysis at gate and layout levels. The design makes use of n-Bit slice concept, the requirement is to design and develop low power high performance circuits. To achieve this, the design requires advanced styles to be employed. High level description language to be used to construct layout of 8-bit ALU and then different analyses will be carried out on this layout.
Keywords: ALU, Bit Slice, Low Leakage, Threshold Volatge.
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Paper Type : Research Paper
Title : Multiple Objects Tracking using CAMshift Algorithm in Open CV
Country : India
Authors : Aditi Jog, Prof.Shirish Halbe
doi : 10.9790/4200-0124146       logo
ABSTRACT:These paper reviews tracking of multiple moving objects with CAMshift algorithm in OpenCV. In many other cases CAMshift considered a feature of tracked object which need to track in video stream. Many times CAMshift algorithm used for face tracking. But in our paper we implement approach of CAMshift algorithm which is capable of track multiple moving objects in video stream. In our paper, we have not considered any feature of object to be tracked. Here first Reference frame is selected by user and further continuously updated Binary foreground pixels are given as an argument to CAMshift, for locating location of desired objects in each frame. Motion contour detection is achieved. By providing overlap threshold criteria in scope of CAMshift algorithm multiple objects are tracked in consecutive video frames and ellipse is getting drawn around each tracked object.
Keywords: CAMshift, foreground pixels, multiple Object tracking, OpenCV.
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Paper Type : Research Paper
Title : Speech Enhancement in a Noisy Environment Using Sub-Band Processing
Country : India
Authors : K. Sravanthi, M. S. Anuradha
doi : 10.9790/4200-0124752       logo
ABSTRACT:One of the methods for recovering a signal corrupted by additive noise using Weiner filtering approach. This paper mainly deals with speech enhancement/recovering using Weiner filtering technique. It uses the Weighted Overlap Add filter bank implemented using digital signal processing techniques. The spectral enhancement is achieved by Voice Activity Detector in conjunction with Weiner filtering, and the results were discussed for different noise floor levels for a stationary recorded input signal..
Keywords: speech enhancement, WOLA filter bank, VAD, weiner filtering.
[1] A flexible filter bank structure for extensive signal manipulations in digital hearing aids by Robert Brennan Todd Schneider
dspFactory, Waterloo Ontario, Canada, N2J 4V1
[2] Technion { Israel Institute of Technology, Department of Electrical Engineering Estimation and Identi¯cation in Dynamical
Systems (048825) Lecture Notes, Fall 2009, Prof. N. Shimkin
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Paper Type : Research Paper
Title : Congession Avoidence in Ip Based CDMA Radio Access Network (Ran) Through Router Control
Country : India
Authors : Gayatri.Ch, Chandra babu.M, Vamsidhar.A, Sashikanth.B, Nalini.P
doi : 10.9790/4200-0125360       logo
ABSTRACT:As communication plays an important role in day to day life, the effective and efficient data transmission is to be maintained. This paper mainly deals with implements a congestion control mechanism using Router control method for IP-RAN on CDMA cellular network. The Router control mechanism uses the features of CDMA networks using active Queue Management technique to reduce delay and to minimize the correlated losses. The Random Early Detection Active Queue Management scheme (REDAQM) is to be realized for the router control for data transmission over the radio network using routers as the channel. As technology develops, we can satisfy these needs by using new tools, new applications and new personal devices. When utilizing these new personal tools and services to enrich our lives, while being mobile, we are using Mobile Multimedia applications. As new handsets, new technologies and new business models are introduced on the marketplace, new attractive multimedia services can and will be launched, fulfilling the demands. Because the number of multimedia services and even more so, the context in which the services are used is numerous, the following model is introduced in order to simplify and clarify how different services will evolve, enrich our lives and fulfill our desires.The proposed paper work is to be realized using Matlab platform.
Keywords: REDAQM, CDMA, IP-RAN, Matlab.
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