نتایج جستجو برای: video quality assessments
تعداد نتایج: 960720 فیلتر نتایج به سال:
This work addresses the optimization of TVresolution MPEG-2 video streams to be transmitted over packet networks facing a given packet loss probability. Several studies have already been carried out on this speci c problem [1, 2, 3]. The main contribution of this work resides in the design of a new exible scene-complexity adaptive mechanism, namely the Perceptual Syntactic Information Coding (P...
in this paper, we propose a new full-fuzzy video ratecontrol algorithm (rca) for variable bit rate (vbr) videoapplications. the proposed rca provides high qualitycompressed video with a low degree computational complexity.by controlling the quantization parameter (qp) on a picturebasis, it produces vbr video bit streams. the proposed rcahas been implemented on the jm h.264/avc video codec andth...
According to progress of technology during the recent decades, video transmission through a wireless channel has found high demands. In this field, several methods have been proposed to improve video quality. Appearing error in motion vector values is one of the most important factors which can affect the video quality. In case of creating errors in motion vector, the synthesized video frames a...
Background & objectives: One of the factors affecting the performance of video display terminal users is their mental work load. Since low sleep quality causes fault and decreased accuracy in work, this study aimed to evaluate the relationship between mental work load and sleep quality in video display terminals users. Methods: This descriptive cross-sectional study was performed on 191 video d...
OBJECTIVE Previous research indicates the beneficial effects of humor among healthy adults. Little is known about the physical and psychological effects of sense of humor and laughter among patients with chronic obstructive pulmonary disease (COPD). METHODS Patients with COPD (n = 46; mean age ± SD, 66.9 ± 9.9 years) completed assessments of sense of humor, depression, anxiety, quality of lif...
Ad hoc networks are multi-hop wireless networks without a pre-installed infrastructure. Such networks are widely used in military applications and in emergency situations as they permit the establishment of a communication network at very short notice with a very low cost. Video is very sensitive for packet loss and wireless ad-hoc networks are error prone due to node mobility and weak links. H...
Introduction: Adherence to diet in dialysis patients is one of the important care challenges that affect the quality of life. Education can change behavior by changing the level of awareness, attitude, and practice. Therefore, this study aimed to compare the effect of face-to-face and video-based diet training on the quality of life of patients undergoing hemodialysis. Methods: This study is a ...
This work addresses the quality of service (QoS) analysis and optimization of TV-resolution MPEG-2 video streams to be transmitted over packet networks facing a given packet loss probability. The first contribution of this work resides in the analysis of the end-to-end QoS of MPEG-2 video streams transmitted over a lossy packet network. We address the problem of video quality prediction and con...
BACKGROUND Intervention programs with the aim of enhancing parenting quality have been found to be differentially effective in decreasing negative child outcomes such as externalizing behavioral problems, resulting in modest overall effect sizes. Here we present the protocol for a randomized controlled trial to examine the efficacy of the Video-feedback Intervention to promote Positive Parentin...
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