Search results for: Nam Pham Ngoc
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Multimedia Tools and Applications > 2019 > 78 > 23 > 33939- 33967
Multi-shot person re-identification (ReID) is a popular case of person ReID in which a set of images are processed for each person. However, using entire image set for person ReID as most experimented proposals is not always effective because of time and memory consuming. The main contribution of this work is the proposed strategies for (1) choosing representative image frames for each individual...
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Nowadays, 360-degree video has become an important component of virtual reality (VR) technology. Unfortunately, this state-of-the-art content type requires a huge bandwidth from a server to a client. In order to solve the bandwidth problem in streaming VR videos over HTTP/2, a dynamic adaptation method is crucial. In this paper, we propose a novel adaptive streaming method based on tiled streaming...
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OpenFlow/Software-Defined Networking (SDN) is a new networking paradigm that virtualizes network infrastructure by decoupling the control and data plane logic of traditional network devices. The controller of SDN has the overall look about network topology and hence provides flexibility to network operators to implement its own routing approaches. However, it could not control the way client works...
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Currently, more and more 360-degree videos (or 360 videos for short) are being provided via the Internet. This kind of videos can render a virtual reality (VR) environment via a head-mounted display (HMD). However, understanding the quality of experience (QoE) of 360 videos is a big challenge because user experience in VR is a very complex phenomenon. In this paper, the QoE of 360 videos is considered...
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360 videos are becoming more and more popular on video streaming platforms. However, a good quality metric for 360 videos is still an open issue. In this work, we investigate both objective and subjective quality metrics for 360 videos. The goals are to understand the perceived quality range provided by existing mobile 360 videos and, especially, to identify appropriate objective quality metrics for...
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In this paper, we propose a hardware-based defense system in Software-Defined Networking architecture to protect against the HTTP GET Flooding attacks, one of the most dangerous Distributed Denial of Service (DDoS) attacks in recent years. Our defense system utilizes per-URL counting mechanism and has been implemented on FPGA as an extension of a NetFPGA-based OpenFlow switch.
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In the context of HTTP Adaptive Streaming (HAS), a main challenge is how to evaluate the quality of experience (QoE) of a session. In general, the QoE of a streaming session is affected by three key factors, namely initial delay, varying perceptual quality, and interruptions. In this paper, in order to investigate the impacts of quality variations and interruptions on the QoE of a session, we propose...
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The development of network services makes their requirements for bandwidth become higher and more various, which leads to difficulty in Quality of Service (QoS) guarantee. In this paper, an OpenFlow switch featuring Weighted Fair Queuing (WFQ) algorithm is proposed. The system is implemented into NetFPGA 1G board which utilizes Xilinx Virtex II Pro 50 technology. The results have shown that our circuit...
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In this paper, we study an adaptation method for mobile streaming over HTTP/2. Beside leveraging the server push feature of HTTP/2 to reduce request-related overheads, the proposed method can improve video quality by delivering gradual video bitrate transitions. Experimental results show that our method can provide smooth video quality while resulting in a low number of requests over a whole session.
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HTTP Adaptive Streaming (HAS) has become a popular trend for multimedia delivery nowadays. Because of throughput variations, video adaptation methods are needed to avoid buffer underflows. In this context, it is also important to evaluate the overall video quality of a session. In this paper, we investigate a quality model that can evaluate a session quality as well as different adaptation strategies...
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A simple low-cost transmitter using low power RGB-type white LED is presented in this article. This type of white LED is widely used for illumination and communication applications. However, the low modulation bandwidth of RGB-LED, which is a few tens of MHz, limits the data rate of a transmission link. By applying a current-shaping-circuit (CSC), we can significantly improve the OOK-NRZ modulation...
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HTTP Adaptive Streaming (HAS) has become a popular trend for multimedia delivery nowadays. Because of throughput variations, video quality strongly fluctuates during a session. Therefore, a main challenge in HAS is how to evaluate the overall video quality of a session. In this paper, we explore the impact of quality variations on the perceptual quality of a video in HAS. We propose to use the histogram...
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Traffic Level of Service (LOS) information is crucial for traffic management systems, especially in urban areas. One method to estimate traffic LoS is to use a central server system to process traffic images captured by road side cameras. However, this approach requires a high performance server system as well as high network throughput to transmit images from the cameras to the server, which results...
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Lecture Notes in Computer Science > Protocols and Systems for Interactive Distributed Multimedia > Standards and Related Issues > 92-105
This paper addresses the QoS adaptation problem in MPEG-4 multimedia applications. This adaptation involves solving a NP-hard optimisation problem, for which an optimal solution is not feasible in real-time. In the paper, we will formulate the problem and present an approximation algorithm called FAQoS to solve the problem in polynomial time by using a number of heuristics. We will show that FAQoS...
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Energy saving is an important requirement for any mobile devices. Meanwhile, streaming is one of the most popular services via mobile devices now. In this paper, we study the dependence of consumed power on adapted video bitrates. A novel adaptation method is then presented to balance the requirements for high video quality and low power consumption.
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HTTP Streaming has been a new trend for video delivering via IP. Currently, most of the adaptation algorithms developed for HTTP Streaming are qualitative, which means the performance metrics could only be shown after the streaming session. In this paper, we embark on this problem by discretizing the whole system. We then formulate an infinite horizon problem (IHP) and solve it by Stochastic Dynamic...
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Multi-bitrate streaming, especially HTTP adaptive streaming (HAS), is becoming popular for video delivery in multimedia network. In this trend, a video is encoded into different versions with different quality levels. Based on the current conditions, a client can adaptively choose the most suitable encoded version. However, the adoption of HAS in managed network (e.g. IPTV) has many challenges because...
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In a timestamp-base packet scheduler, which is an important part of Quality of Service (QoS) enabled network systems, Tag Sorting is the most critical step. This paper presents a high throughput pipelined architecture for Tag Sorting targeting FPGA technology. Our implementation results on Xilinx Virtex II pro 50 chip have shown that our design can run at a maximum clock frequency of 216 MHz and process...
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In adaptive video streaming, rate adaptation is an important procedure for switching between different representations provided at the server, to cope with the network fluctuations. However, most of adaptation methods ever since mainly focus on the case of constant bitrate (CBR) video. In this paper, we present a new method that can effectively support variable bitrate (VBR) videos. Our method is...
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Advanced multimedia applications such as those being developed within Ambient Intelligence typically share common characteristics, viz. the need to be able to access a wide variety of multimedia content using a heterogeneous communication and consumption infrastructure, in combination with low cost and low power requirements. The fact that a large variety of heterogeneous multimedia content has potentially...
