• Title/Summary/Keyword: Traffic Video

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Transmission Rate Decision of Live Video Based on Coding Information (부호화 정보에 기반한 라이브 비디오의 전송률 결정)

  • Lee Myeong-jin
    • Journal of Korea Multimedia Society
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    • v.8 no.9
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    • pp.1216-1226
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    • 2005
  • In this paper, a preventive transmission rate decision algorithm, called PTRD, is proposed for the transmission of live video over networks with dynamic bandwidth allocation capability. Frame analyzer predicts the bit-rates of future frames before encoding by analyzing the source information such as spatial variances and the degree of scene changes. By using the predicted bit-rates, transmission rate bounds are derived from the constraints of encoder and decoder buffers. To resolve the problem of renegotiation cost increment due to frequent renegotiations, the PTRD algorithm is presented to decide transmission rates considering the elapsed time after the recent renegotiation and the perceived video quality. From the simulation results, compared to the normalized LMS based method, PTRD is shown to achieve high channel utilization with low renegotiation cost and no delay violation.

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Performance Analysis of Buffer Aware Scheduling for Video Services in LTE Network

  • Lin, Meng-Hsien;Chen, Yen-Wen
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.9
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    • pp.3594-3610
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    • 2015
  • Recent advancements in broadband wireless communication technologies enable mobile users to receive video streaming services with various smart devices. The long term evolution (LTE) network provides high bandwidth and low latency for several emerging mobile applications. This paper proposes the buffer aware scheduling (BAS) approach to schedule the downlink video traffic in LTE network. The proposed BAS scheme applies the weighting function to heuristically adjust the scheduling priority by considering the buffer status and channel condition of UE so as to reduce the time that UE stays in the connected state without receiving data. Both of 1080P and 2160P resolution video streaming sources were applied for exhaustive simulations to examine the performance of the proposed scheme by comparing to that of the fair bandwidth (FB) and the best channel quality indicator (CQI) schemes. The simulation results indicate that the proposed BAS scheme not only achieves better performance in power saving, streaming delivery time, and throughput than the FB scheme while maintaining the similar performance as the best CQI scheme in light traffic load. Specifically, the proposed scheme reduces streaming delivery time and generates less signaling overhead than the best CQI scheme when the traffic load is heavy.

An Approach to Video Based Traffic Parameter Extraction (영상을 기반 교통 파라미터 추출에 관한 연구)

  • Yu, Mei;Kim, Yong-Deak
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.38 no.5
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    • pp.42-51
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    • 2001
  • Vehicle detection is the basic of traffic monitoring. Video based systems have several apparent advantages compared with other kinds of systems. However, In video based systems, shadows make troubles for vehicle detection, especially active shadows resulted from moving vehicles. In this paper, a new method that combines background subtraction and edge detection is proposed for vehicle detection and shadow rejection. The method is effective and the correct rate of vehicle detection is higher than 98% in experiments, during which the passive shadows resulted from roadside buildings grew considerably. Based on the proposed vehicle detection method, vehicle tracking, counting, classification and speed estimation are achieved so that traffic parameters concerning traffic flow is obtained to describe the load of each lane.

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A Study on the Traffic Agent System Using Unicast Method and P2P (유니캐스트 방식과 P2P를 응용한 트래픽 에이전트 시스템에 관한 연구)

  • Kim Hyun-Ki;Kim Song-Young;Cho Dae-Jea
    • Journal of Korea Multimedia Society
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    • v.8 no.5
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    • pp.707-741
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    • 2005
  • In the multimedia streaming technology, the unicast method require additional cost by an increase traffic according to increase a number of users. The multicast method can solve this problem, but it don't have connection and control information of clients. Now, the most routers support only unicast. Also it has a problem with an exchange of service in other ISP. This paper proposes traffic agent system which is applied unicast and P2P(Peer to Peer) for distance video teaming to overcome this problem. The proposed system decrease the traffic of stream server by control agent, and cut down expenses of network. This system is tested under the distance video leaning using JMF and application software.

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Impacts Analysis of the operation of DVR(Driving Video Recorder) on Driver's Behavior Change and Reduction of Traffic Accident (교통사고 영상기록장치(DVR : Driving Video Recorder)의 설치가 운전자의 운전태도 변화와 교통사고 저감에 미치는 효과 분석)

  • Jang, Seok-Yong;Jeong, Heon-Yeong;Baek, Sang-Geun;Go, Sang-Seon
    • Journal of Korean Society of Transportation
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    • v.27 no.3
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    • pp.119-130
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    • 2009
  • The aim of this study is to analyze the effects of DVR(Driving Video Recorder) operation on decreasing the number of traffic accidents, the cost of traffic accident claim, and the behavioral change in drivers' driving. The data for this research are obtained from taxi drivers in Busan. For this, Structural Equation Model and two-way ANOVA are employed for empirical analysis. Overall results of this study show that the number of traffic accidents of 4 taxi corporations in Busan has decreased by average 32.7 percent after using DVRs. In addition, as to the cost of taxi accident claims, it is expected that the DVR operation has a considerable effect on economic benefits of taxi corporations. Moreover, this study could make clear the difference in behaviors between DVR users and non-users, and discriminate the positive and negative impacts of the DVR operation on the drivers' driving behavior. The study quantitatively examined the indirect impact of 'attitude', 'subject norm' and 'behavioral control' factors on planned 'behavior', and the direct impact of 'behavioral control' factor on the planned 'behavior'. This study suggests that they should add the video recoding function of DVRs when operation recorder(blackbox for the car) is obligatorily set up on cars for business by traffic security law.

Effective Admission Policy for Multimedia Traffic Connections over Satellite DVB-RCS Network

  • Pace, Pasquale;Aloi, Gianluca
    • ETRI Journal
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    • v.28 no.5
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    • pp.593-606
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    • 2006
  • Thanks to the great possibilities of providing different types of telecommunication traffic to a large geographical area, satellite networks are expected to be an essential component of the next-generation internet. As a result, issues concerning the designing and testing of efficient connection-admission-control (CAC) strategies in order to increase the quality of service (QoS) for multimedia traffic sources, are attractive and at the cutting edge of research. This paper investigates the potential strengths of a generic digital-video-broadcasting return-channel-via-satellite (DVB-RCS) system architecture, proposing a new CAC algorithm with the aim of efficiently managing real-time multimedia video sources, both with constant and high variable data rate transmission; moreover, the proposed admission strategy is compared with a well-known iterative CAC mainly designed for the managing of real-time bursty traffic sources in order to demonstrate that the new algorithm is also well suited for those traffic sources. Performance analysis shows that, both algorithms guarantee the agreed QoS to real-time bursty connections that are more sensitive to delay jitter; however, our proposed algorithm can also manage interactive real-time multimedia traffic sources in high load and mixed traffic conditions.

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A Study on the Performance Enhancements of Video Streaming Service in MPLS Network

  • Kwak Kyoung Hwan;Park In Kap;Kim Chung Hyun
    • Proceedings of the IEEK Conference
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    • 2004.08c
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    • pp.549-551
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    • 2004
  • This paper used OPNET to simulate video streaming service a test IP network and MPLS network with the traffic shaping that have with CQ_ LLQ algorithm, LSP of fixed bandwidth, policy of limitation users and measures parameters such as delay, throughput, packet loss. To verify the performance of video streaming service in IP network and MPLS network, two scenario that have same topology and traffic source. One is the simulation for best-effort service in pure IP network. The other is the simulation for QoS-enabled service in MPLS Network. Based on simulation result, the MPLS network with CQ_ LLQ algorithm and fixed LSP show advantage of the video streaming service QoS, specially delay and packet loss

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RTP based Multicast Transmission Technique of Video Stream for Real-Time Multimedia Transmission (실시간 멀티미디어 전송을 위한 RTP 기반 비디오 스트림의 멀티캐스트 전송 기법)

  • 정규수;양종운;나인호
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.5 no.6
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    • pp.1104-1109
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    • 2001
  • In this paper, we describe a method for real-time transmitting video streams based on RTP. In order to guarantee synchronous video streams, we propose a method to grasp network situations by analyzing end-to-end network traffic. In addition, we present an algorithm for satisfying QoS requirements of real-time multimedia transmission and maintaining continuity of transmission. It describes a buffering method for overcoming bandwidth limitations and an analyzing method based on RTCP for grasping network traffic situation to resolve the problem of real-time transmission of video streams.

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Real-Time Multicast Transmission Technique of Video Stream using RTP (RTP를 이용한 비디오 스트림의 실시간 멀티캐스트 전송 기법)

  • 정규수;양종운;나인호
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.10a
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    • pp.169-172
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    • 2001
  • In this paper, we describe a method for real-time transmitting video streams based on RTP In order to guarantee synchronous video streams, we propose a method to grasp network situations by analyzing end-to-end network traffic. In addition, we present an algorithm for satisfying QoS requirements of real-time multimedia transmission and maintaining continuity of transmission. It describes a buffering method for overcoming bandwidth limitations and an analyzing method based on RTCP for grasping network traffic situation to resolve the problem of real-time transmission of video streams.

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Performance Analysis of the Multiplexer for Shaped Video Traffic Sources (쉐이퍼를 사용한 비디오 트래픽원의 다중화기 성능 분석)

  • Lee, S.C.;Hong, J.W.;Kim, C.S.
    • IE interfaces
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    • v.18 no.4
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    • pp.494-503
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    • 2005
  • This paper considers the problem of performance analysis for the multiplexer, when homogeneous periodic on-off sources are statistically multiplexed. Periodic on-off source model is defined that on-period and off-period are repeated by once in a deterministic periodic time and in on-period, cell arrives with deterministic time interval. In order to reflect periodicity of source model, we consider two multiplexing situation, such as random multiplexing and synchronized multiplexing. In both case, we obtain the overload-period distribution in the multiplexer, and an approximate method using the overload period distribution is suggested for obtaining the CLP(Cell Loss Probability) in the buffer of the multiplexer. A numerical example using MPEG-I real traffic samples and the results are also presented.