A New Accordion Based Video Compression Method

Vol.1 No. 4

Year: 2011

Issue: June-August

Title: A New Accordion Based Video Compression Method 

Author Name: Jaya Krishna Sunkara, kuruma Purnima , Navaneetha Sagari , Rama Subbareddy 

Synopsis: 

Usually, a video signal has high temporal redundancies due to the high correlation between successive frames. This redundancy has not been exploited enough by current video compression techniques. In this pape44grr, we present a new video compression technique which tends to hard exploit the pertinent temporal redundancy in the video to improve processing efficiency with minimum processing complexity. It includes 3D to 2D transformation of the video that allows exploring the temporal redundancy of the video using 2D transforms and avoiding the computationally demanding motion compensation step. This transformation converts the spatial and temporal correlation of the video signal into a high spatial correlation. Indeed, this technique transforms each group of pictures into one picture eventually with high spatial correlation. Thus, the De-correlation of the resulting pictures by the DCT makes efficient energy compaction, and therefore produces a high video compression ratio. Many experimental tests had been conducted to prove the technique efficiency especially in high bit rate and with slow motion video.

    

Xilinx System Generator Based Modeling and Simulation of SVPWM

Vol.1 No. 4

Year: 2011

Issue: June-August

Title: Xilinx System Generator Based Modeling and Simulation of SVPWM 

Author Name: R. Rajendran, N. Devarajan 

Synopsis: 

This paper is about modeling and simulation of Space Vector Pulse Width Modulation (SVPWM) scheme for a three phase Voltage Source Inverter (VSI). The model was implemented using Xilinx System Generator and MATLAB/Simulink blockset. The most widely used schemes for a three phase VSI are carrier based Sinusoidal PWM (SPWM) and SVPWM. There is an increasing trend of using SVPWM because of their easier digital realization and better DC bus utilization. The novelty of the paper relies on the proposal of the flexible and new model of SVPWM.

   

Efficient Image Compression Algorithms Using Evolved Wavelets

Vol.1 No. 4

Year: 2011

Issue: June-August

Title: Efficient Image Compression Algorithms Using Evolved Wavelets 

Author Name: Chenchu Krishnaiah G, T. Jaya Chandra Prasad, Giri Prasad M.N 

Synopsis: 

The 9/7 and 5/3 lifting based wavelet filters are  widely used in different image compression schemes, such as JPEG 2000 image compression standard. The performance of a hardware implementation of the 9/7 and 5/3 filter banks depends on the accuracy with which filter coefficients are represented. In this paper an attempt has been made to study the performance of 9/7 and 5/3 wavelets on photographic images (monochrome and color) and estimated Peak Signal to Noise Ratio (PSNR), Compression Ratio (CR), Mean Square Error (MSE), Encoding Time, Decoding Time, Transforming Time or Decomposition Time…etc. This study shows that the 5/3 wavelet transform outperform the 9/7 wavelet transform.

A Comparison of Different Image Enhancement Techniques

Vol.1 No. 3

Year: 2011

Issue: March-May

Title: A Comparison of Different Image Enhancement Techniques 

Author Name: Anu Radha B, Purushotham Prasad Kalisetti, P.S. Karthik , S. Damodar , S. Srilekha 

Synopsis: 

Images are captured at low contrast in a number of different scenarios. Image enhancement algorithms are used in a variety of image processing applications, primarily to improve or enhance the visual quality of an image by accentuating certain features. Image processing modifies pictures to improve them (enhancement, restoration) to prepare suitable images for various applications from raw unprocessed images.Image enhancement improves the quality (clarity) of images for human viewing. Increasing contrast, and revealing details are examples of enhancement operations whereas removing blurring and noise comes under the category Image restoration. In this paper comparison ofdifferent algorithms are used for image enhancement (histogram equalization, adaptive histogram equalization, continuous histogram equalization, decorrelation stretching, median filtering, negative image and intensity adjustment). In this decorrelation stretching, median filtering and intensity adjustment together gives the best method for enhancing because it not only increases the intensity values but also removes salt-and-pepper noise.

A Novel Method for Harmonic Elimination

Vol.1 No. 3

Year: 2011

Issue: March-May

Title: A Novel Method for Harmonic Elimination 

Author Name: Sandeep Rode, Siddharth Ladhake 

Synopsis: 

A new filter strategy for harmonic elimination is introduced in this paper. The proposed filter eliminate undesirable harmonic from periodic signal. The proposed approach eliminates all harmonics component from periodic signal and it requires only knowledge of the frequency of the fundamental component.    Adaptation process adjusts weights to exactly match amplitude and phase of      fundamental frequency component and   the outputs of the filter is a harmonics replica and are subtracted   from the original composite waveform to eliminate them. The bipolar waveforms are roughly analyzed. The simulation results show that the method can effectively eliminate undesirable harmonics and result in low(less than one percentage) total harmonic distortion (THD).

Performance Analysis of Fair Cac Scheme in Wireless Multimedia Communication Network

Vol.1 No. 3

Year: 2011

Issue: March-May

Title: Performance Analysis of Fair Cac Scheme in Wireless Multimedia Communication Network 

Author Name: V. Saravanan, M. Vadivel 

Synopsis: 

Modern wireless network is expected to support multimedia traffic and to provide the very high Quality of service (Qos) in multimedia network, how to ensure the very high Quality of service in multimedia network is the emerging technology. Call Admission Control (CAC) plays an important role in the QoS guarantee of multimedia network. Many CAC schemes aim to satisfying QoS requirement and upgrading network utilization, but they ignore the fairness principle in network. Directly and simple using these CAC schemes, it will appear the phenomenon of unbalance that the narrow band calls block the broad band calls. So, this paper proposes a fair call admission control scheme by introducing call hold control. Numerical results show that the new scheme not only realizes the balancing accessing machinery to all calls, but also decrease CBP (Call Block Probability) and improves network utilization.

Guided and Leaky Modes of a Multilayer Planar Slab Waveguide

Vol.1 No. 3

Year: 2011

Issue: March-May

Title: Guided and Leaky Modes of a Multilayer Planar Slab Waveguide 

Author Name: S. K. Raghuwanshi, V. Kumar, Radha Raman Pandey 

Synopsis: 

Guided/Radiation modes of a multilayer symmetric slab waveguide are treated in detail. Since the slab is assumed to be infinite extended in the   plane, all field quantities are considered to be independent of. The analysis is based on modal expansion formulation and the modes can be classified as TE and TM as well as even and odd ones. Applying the boundary conditions at the interfaces, the expansion coefficients of the field components are easily calculated. In addition, the normalization factors, and the orthogonal ties properties are determined by deriving appropriate integrals over the cross-section of the waveguide. Finally the result is validated with some examples.