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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 01 | Jan -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 888 Video Quality Evaluation of MPEG-4 Using (MOS) Mean Opinion Score in NS-2 Younis Rasool Wani, Dr.Swati Sharma,Sanjeev Chopra Reaseach Scholar,Electronics and Communication Engineering,UGI college Lalru,Punajb,India --------------------------------------------------------------*****---------------------------------------------------------------- Abstract- Recently visibly a lot of telecommunication systems are supporting various types of real-time transmission and video transmission being one most important application. Today’s studies reveal that around 60 % of the data on social media and other internet applications use video transmission. So the growing demands for telecom operators needs much sophisticated methods and procedures to provide high quality real-time video streaming in limited bandwidth paradigm. Some scholars have marginally done a good job to improve the characteristics of video transmission such as packet loss rate, packet delay or packet jittering. However the above quality parameters cannot be easily and uniquely transformed into high quality video transmission. The drawback of these parameters is that their transformations will be different for every coding scheme, loss concealment and jitter handling. The tools available in market for video quality evaluation often assume synchronized frames at both sender and receiver side. However this assumed synchronization of frames cannot be applied in case of frame drops and frame decoding errors. JNDmetrix-IQ software and the AQUAVIT are the publically available tools in today’s market but they can’t evaluate incomplete received videos at the receiver side. These are applicable to video frame which can be decoded at the receiver side without any jittering and delay loss. In this paper Keywords– MPEG, NS-2, Adhoc Networks, PSNR,MOS. 1.INTRODUCTION:- Peak signal-to- noise ratio, abbreviated as PSNR, is an engineering term for the fraction between the highest doable power of a signal and the power of corrupting noise that affect the reliability of its representation. Because several signals have incredibly wide dynamic range, PSNR is typically uttered in provisions of the logarithmic decibel scale for measurement. PSNR is generally used to determine the quality of restoration of lossy compression codec’s (for instance, for image compression). The signal is our scenario is the data signal in original form and the noise considered is the error that occurs by compression. When we compare compression codecs, PSNR is an rough calculation to human observation of rebuilding original signal with same quality. Even though a upper PSNR generally indicate that the reconstruction is of superior quality, in some cases it could not. One have to be tremendously cautious with the range of power of this metric; it is decisively valid only when it is used to compare results from the similar codec and similar content. PSNR is mainly defined via the mean squared error also known as MSE. In a noise-free m×n monochrome image I and its noisy approximation K, MSE is defined as: The PSNR (in dB) is defined as: Typical values for the PSNR in lossy image and video compression are between 30 and 50 dB, provide the bit depth is 8 bits, which should be higer always . For 16-bit data typical values for the PSNR are between 60 and 80 dB. Acceptable values for wireless communication quality loss are considered to be about 20 dB to 25 dB.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 01 | Jan -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 889 The PSNR block compute the peak signal-to-noise ratio(PSNR), in decibels, among two images. This ratio is regularly used as a quality amount between the original image signal and a compressed image signal. The higher the PSNR of a image signal, better is the quality of the compressed, or reconstructed image signal. There are two types of error metrics used for quality of image compression one is known as the Mean Square Error (MSE) and other is the Peak Signal to Noise Ratio (PSNR. The MSE always represents the cumulative squared error among the compressed image signal and the original image signal, whereas PSNR represents a measure of the peak error.Also we can say that lower the value of MSE signal lower is probability of error in the image signal. To calculate the PSNR, the initial block primarily calculates the mean-squared error using the below equation: MSE and PSNR are the algorithms adopted in image processing for evaluating the performance of the codec of interest; they are closely linked to and borrowed from other contexts of signal processing. Even though easy for implementation and calculation purposes, they show the side in different situations, so the findings cannot be considered always reliable. Nevertheless, their use continues to be predominant in the performance evaluation of any video coding system. PSNR is one of the most widespread objective metrics to assess the application-level QoS of video transmissions. The below equation shows the definition of the PSNR between the luminance component Y of source image S and destination image D: PSNR(n)dB = 20 where Vpeak = 2k-1 and k = number of bits per pixel also known as luminance component. PSNR calculates the error between a reconstructed image signal and the original image signal. Prior to transmission, one may then compute a reference PSNR value sequence on the reconstruction of the encoded video as compared to the original raw video. After transmission, the PSNR is computed at the receiver for the reconstructed video of the possibly corrupted video sequence received. The individual PSNR values at the source end or receiver end do not mean much, but the dissimilarity between the quality of the encoded video signal at the source and the received one can be used as an objective QoS metric to review the transmission impact on video quality at the application level. Results: The results are prepared by considering different outcomes of the peak signal to noise ratio (PSNR) MPEG video on different parameters and are viewed separately but the final conclusion is made by comparing the results. 6.1Effects of bandwidth, fragment size, and CER on PSNR The peak signal to noise ratio in the multimedia traffic is examined by varying the parameters. First we have varied the fragment size and channel error rate (CER) for different set of bandwidth and PSNR is measured. The following results are observed. The results are divided with reference to the bandwidth PSNR at 0.5 Mbps bandwidth
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 01 | Jan -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 890 3 Figure 1.1 : Graph for PSNR at 0.5Mbps In the above result bandwidth is set at 0.5 Mbps ,the size is increased from 256 Kb to 1024 kb and channel error is varied slightly from 0.1 to 0.6 then peak signal to noise ratio gets improved from initially from 26.828076 to 24.22287 at 256 kb and then from 26.828076 to 25.248752 at 1024 kb. For Example at CER 0.6 size is 256 kb and PSNR is 24.22287 and gets improved to 25.248752 when size is increased to 1024 kb. PSNR at 1.0 Mbps bandwidth Figure 1.2: Graph of PSNR at 1.0Mbps The above graph shows PSNR at 1.0 Mbps in which channel error rate is fixed and fragment size is increased. This graph suggests that peak signal to noise ratio (PSNR) at varying channel error rate (CER) and fragment size at three sets of bandwidth reveals that the PSNR improves for higher channel error rate (CER) at higher fragment size. PSNR at 2.0 Mbps bandwidth Figure 1.3: Graph for PSNR at 2.0Mbps The analysis of peak signal to noise ratio (PSNR) at varying channel error rate (CER) and fragment size at three sets of bandwidth reveals that the PSNR improves for higher channel error rate (CER) at higher fragment size. CONCLUSION: In this article, different parameters are changed to increase the peak signal to noise ratio because peak signal to noise ratio is ratio between the maximum possible power of a signal and the power of corrupting noise that affects the fidelity of its representation in image compression. In order to improve the peak signal to noise ratio (PSNR) three parameters were varied namely channel error rate (CER) and data size and bandwidth .when these parameters are varied the peak signal to noise ratio is improved drastically as it can been from the
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 01 | Jan -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 891 results shown in the above figures. REFRENCES [1] Forouzan,. “Data communications and networking”. 4th ed. New York, Tata McGraw-Hill publishing company limited. 2007. [2] IEEE computer society. “802 IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture”. New York. IEEE. 2001 [3] Gilberto Flores Lucio, Marcos Paredes Farrera, Emmanuel Jammeh, Martin Fleury, Martin J. Reed, Mohammed Ghanbari and Fellow IEEE (2006), “Análisis a Nivel-Paquete de Simuladores de Red Contemporáneos”, IEEE LATIN AMERICA TRANSACTIONS, VOL. 4, NO.4, pp. 299-307. [4] Christhu raj M.R, Namrata marium Chacko, John major and Shibin. D (2013), “A Comprehensive Overview on Different Network Simulators”, International Journal of Engineering and Technology (IJET), VOL. 5, No.1, pp. 0975-4024. [5] Marc Greis’ Tutorial for the UCP/LBNL/VINT Network Simulator “ns”. [6] Teerawat Issariyakul and Ekram Hossain. “Introduction to Network Simulator NS2”, 2nd ed. New York, Springer. 2012. [7] Emilio Raggi, Keir Thomas,Trevor Parsons, Andy Channelle, and Sander van Vugt. “Beginning Ubuntu Linux”, 5th ed. New York, springer. 2010. [8] Raffaele Bruno, Marco Conti, and Enrico Gregori (2008), “Throughput Analysis and Measurements in IEEE 802.11 WLANs with TCP and UDP Traffic Flows”, IEEE TRANSACTIONS ON MOBILE COMPUTING, VOL. 7, NO. 2, pp. 1233-1536. [9] S. Giannoulis, C. Antonopoulos, E. Topalis, A. Athanasopoulos, A. Prayati and S. Koubias (2006), “TCP vs. UDP Performance Evaluation for CBR Traffic On Wireless Multihop Networks”, 5th International Symposium on Communication Systems, Networks and Digital Signal Processing, pp 154-158. [10] Jae Chung and Mark Claypool (2003), “Analysis of Active Queue Management”,2nd IEEE International Symposium on Network Computing and Applications (NCA), Cambridge, MA, USA, pp. 359- 366. [11] T. Bhaskar Reddy and Ali Ahammed (2008), “Performance Comparison of Active Queue Management Techniques”, Journal of Computer Science, VOL. 4, NO. 12, pp 1020-1023. [12] Antonios Argyriou and Vijay Madisetti (2003), “Performance Evaluation and Optimization of SCTP in Wireless Ad-Hoc Network”, 28th Annual IEEE International Conference on Local Computer Networks (LCN'03), pp. 317-318. [13] Muhammad Aamir and Mustafa A. Zaidi (2013), “A Buffer Management Scheme for Packet Queues in MANET”, IEEE Tsinghua Science and Technology, VOL. 18, NO. 6, pp 543-553. [14] Joe Naoum-Sawaya, Bissan Ghaddar, Sami Khawam, Haidar Safa, Hassan Artail, and Zaher Dawy (2005), “Adaptive Approach for QoS Support in IEEE 802.11e Wireless LAN”,IEEE International Conference on Wireless And Mobile Computing, Networking And Communications, VOL. 2, pp 167- 173. [15] Jirka Klaue, Berthold Rathke, and Adam Wolisz (2003), “EvalVid - A Framework for Video Transmission and Quality Evaluation”, 13th International Conference on modelling techniques and tools for computer performance evaluation, VOL. 2794, pp 255-272. [16] Chih-Heng Ke, Ce-Kuen Shieh, Wen-Shyang Hwang, and Artur Ziviani, Member, IEEE (2005). “A Two Markers System for Improved MPEG Video Delivery in a DiffServ Network”, IEEE Communication Letters, VOL. 9, NO. 4, pp 381-383. [17] Chih-Heng Ke, Ce-Kuen Shieh, Wen-Shyang Hwang and Artur Ziviani (2006), “An Evaluation Framework for More Realistic Simulations of MPEG Video Transmission”, Journal of Information Science and Engineering, VOL. 24, NO. 2, pp 425- 440. [18] Cheng-Han Lin, Chih-Heng Ke, Ce-Kuen Shieh and Naveen K Chilamkurti (2006), “The Packet Loss Effect on MPEG Video Transmission in Wireless Networks”, IEEE Proceedings of the 20th International Conference on Advanced Information Networking and Applications (AINA’06), VOL. 1, pp 565-572.
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