Topic
Video quality
About: Video quality is a research topic. Over the lifetime, 13143 publications have been published within this topic receiving 178307 citations.
Papers published on a yearly basis
Papers
More filters
05 Jun 2011
TL;DR: The proposed QoE scheme jointly optimizes the application layer and the lower layers of a wireless protocol stack to minimize the temporal change of the video quality as perceivable quality fluctuations negatively affect the overall quality of experience.
Abstract: This paper proposes a novel approach for Quality of Experience (QoE) driven cross-layer optimization for wireless video transmission. We formulate the cross-layer optimization problem with a constraint on the temporal fluctuation of the video quality. Our objective is to minimize the temporal change of the video quality as perceivable quality fluctuations negatively affect the overall quality of experience. The proposed QoE scheme jointly optimizes the application layer and the lower layers of a wireless protocol stack. It allocates network resources and performs rate adaptation such that the fluctuations lie within the range of unperceivable changes. We determine corresponding perception thresholds via extensive subjective tests and evaluate the proposed scheme using an OPNET High Speed Downlink Packet Access (HSDPA) emulator. Our simulation results show that the proposed approach leads to a noticeable improvement of overall user satisfaction for the provided video delivery service when compared to state-of-the-art approaches.
68 citations
07 Jun 2010
TL;DR: The proposed Perceptual Quality Metric (PQM) shows better results for 3D video quality evaluation and outperforms the Video Quality Metrics (VQM); as it is sensitive to slight changes in image degradation and error quantification starts at pixel level right up to the sequence level.
Abstract: One method of evaluating the quality of stereoscopic video is the use of conventional two dimensional (2D) objective metrics. Metrics with good representation of the Human Visual System (HVS) will present more accurate evaluation. In this paper we propose a perceptual based objective metric for 2D videos for 3D video quality evaluation. The proposed Perceptual Quality Metric (PQM) shows better results for 3D video quality evaluation and outperforms the Video Quality Metric (VQM); as it is sensitive to slight changes in image degradation and error quantification starts at pixel level right up to the sequence level. Verifications are done through series of subjective tests to show the level of correlation of PQM and user scores.
68 citations
TL;DR: An integrated system view of admission control and scheduling for both contention and poll-based access of IEEE 802.11e medium access control (MAC) protocol is proposed and a new concept called time fairness is introduced, which is critical in enhancing the video performance when different transmitter-receiver pairs deploy different cross-layer strategies.
Abstract: This paper presents efficient mechanisms for delay- sensitive transmission of video over IEEE 802.11a/e wireless local area networks (WLANs). Transmitting video over WLANs in real time is very challenging due to the time-varying wireless channel and video content characteristics. This paper provides a comprehensive view of how to adapt the quality of service signaling, IEEE 802.11e parameters and cross-layer design to optimize the video quality at the receiver. We propose an integrated system view of admission control and scheduling for both contention and poll-based access of IEEE 802.11e medium access control (MAC) protocol and outline the merits of each approach for video transmission. We also show the benefits of using a cross-layer optimization by sharing the application, MAC, and physical layer parameters of the open systems interconnection stack to enhance the video quality. We will show through analysis and simulation that controlling the contention-based access in IEEE 802.11e is simple to realize in real products and how different cross-layer strategies used in poll-based access lead to a larger number of stations being simultaneously admitted and/or a higher video quality for the admitted stations. Finally, we introduce a new concept called time fairness, which is critical in enhancing the video performance when different transmitter-receiver pairs deploy different cross-layer strategies.
67 citations
03 Sep 2007
TL;DR: This paper looks at recent trends and developments in video quality research, in particular the emergence of new generations of quality metrics (compared to those focused on compression artifacts), including comprehensive audiovisual quality measurement.
Abstract: This paper gives a brief overview of the current state of the art of video quality metrics and discusses their achievements as well as shortcomings. It also summarizes the main standardization efforts by the Video Quality Experts Group (VQEG). It then looks at recent trends and developments in video quality research, in particular the emergence of new generations of quality metrics (compared to those focused on compression artifacts), including comprehensive audiovisual quality measurement.
67 citations
TL;DR: VQEG's work is reviewed, paying particular attention to the group's approach to validation testing of objective perceptual quality models.
Abstract: For industry, the need to access accurate and reliable objective video metrics has become more pressing with the advent of new video applications and services such as mobile broadcasting, Internet video, and Internet Protocol television (IPTV). Industry-class objective quality- measurement models have a wide range of uses, including equipment testing (e.g., codec evaluation), transmission- planning and network-dimensioning tasks, head-end quality assurance, in- service network monitoring, and client-based quality measurement. The Video Quality Experts Group (VQEG) is the primary forum for validation testing of objective perceptual quality models. The work of VQEG has resulted in International Telecommunication Union (ITU) standardization of objective quality models designed for standard- definition television and for multimedia applications. This article reviews VQEG's work, paying particular attention to the group's approach to validation testing.
67 citations