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Subjective video quality assessment (VQA) strongly depends on semantics, context, and the types of visual distortions. Currently, all existing VQA databases include only a small number of video sequences with artificial distortions. The development and evaluation of objective quality assessment methods would benefit from having larger datasets of real-world video sequences with corresponding subjective...
The increasing adoption of smart phones, the increased access to mobile broadband networks and the availability of public cloud infrastructures are aligning to the next generation of truly ubiquitous multimedia services, known as Cloud Mobile Media (CMM) services. Nevertheless, due to an inherit higher and variable end to end delay mainly as a result of the virtualization process, new challenges appear...
In recent years, the popularity of smartphones has increased massively as a personal and authentication device. Face based biometrics is being used to secure the device and control access to several different services via smartphones such as payment gateways etc. Thus, to maintain the reliability and to obtain better verification performance, there is a need to adopt the standards recommended for...
Widespread of virtual reality technologies across entertainment formats has created a diverse infrastructure of related technologies as head-mount displays, dome screens and virtual reality multi-camera platforms. As omnidirectional content is processing pipeline is completely different form conventional planar video and involves multiple conversion steps which affect quality in a different way. As...
Whenever a video is being digitized, compressed and transmitted across the network, some degradation might be introduced that could affect the quality of the video received. Thus, it is essential to provide feedback system to the provider which could allow them the freedom to feedback to the system, if the quality of video being transmitted could be improved, in terms of video quality. This is an...
The popularity of 3D applications, such as Free View-point TV (FTV) and Multi-view Video plus Depth (MVD), induces a heavy requirement of synthesized views. However, the quality assessment of synthesized views is very challenging because the corresponding original views (reference views) are usually not available at both encoder and decoder sides. In this paper, we propose a new no-reference quality...
A quality metric of the image is the major interesting area in the digital image processing system. The metric or assessment can be done individually or accurately on the image. It is vital for a digital imaging system to be able to guess the quality of the image and predict the minimum and maximum value of the metric used to evaluate the image quality. So that it can be preserved, control and possibly...
Over the past decade, software has spread to most areas of our lives. This has led to increased demands on product quality and complexity. Industrial software which belong to a safety-critical area where high quality products are essential. Many processes and standards must be completed and met within stipulated deadlines. The complexity of the software and the boundary conditions of developing it...
The quality assessment of 3D images is playing a critical role in 3D multimedia applications. In this paper, we propose a novel watermarking based quality assessment scheme for depth-image-based rendering (DIBR) 3D images. The scheme utilizes the extracted watermarks to evaluate the quality of the watermarked images under various distortions. In this scheme, the watermark is embedded into the selected...
Recent research indicates that the well known scale invariance property of natural images may originate from the existence of the critical image layer exhibiting phase transition from disordered to ordered states as the intensity scale increases. In this paper we examine the impact of phase transition on perceptual quality assessment of images and confirm that using only the ordered or structured...
Customer satisfaction is an important factor governing adoption and retention of multimedia products and services, such as Over-The-Top(OTT) video transmission. Quality of Experience involves user-centric evaluation of various services. However, users differ in terms of their ratings of service quality. Some rating differences are due to unreliability (outlier users who are not motivated, or are not...
JPEG is still the most widely used image compression format. Perceptual quality assessment for JPEG images has been extensively studied for the last two centuries. While a large number of no-reference perceptual quality metrics have been proposed along the years, it is shown in this paper that on existing image quality databases, statistically, performance of many those metrics is not better than...
A multi-stage temporal pooling mechanism is proposed in this paper for improving the prediction capability of an objective quality metric for video quality assessment. The performance of the proposed pooling mechanism is evaluated along with that of traditional pooling mechanisms in terms of linear correlation coefficient and Spearman rank order correlation coefficient on four publicly available video...
In this paper we are interested in establishing a pretreatment for existing metrics without reference (MSU Blocking Metric) for the H.264/MPEG-4 (Motion Picture Expert Group) AVC (Advanced Video Coding) standard. We perform a pretreatment using HARRIS saliency map to improve the performance of this metric. We evaluate the performance of the proposed pretreatment by using subjective “LIVE” video databases...
In view of the urgency of the problem of cancer diseases of the vocal apparatus and their treatment by surgery relevance of speech rehabilitation of patients is increased. This article describes the phoneme pronunciation quality assessment system, its inputs, outputs and internal parameters. Presented a mathematical model of the system, a functional model of the system in the form of contextual diagrams...
The subjective quality assessment (SQA) is an ever demanding approach due to its in-depth interactivity to the human cognition. The addition of no-reference based scheme could equip the SQA techniques to tackle further challenges. Existing widely used objective metrics-peak signal-to-noise ratio (PSNR), structural similarity index (SSIM) or the subjective estimator-mean opinion score (MOS) requires...
New Hybrid Television systems have been recently developed and are in process of deployment. The video quality assessment is very important for any present and future broadcast or broadband multimedia service. This paper highlights the importance of video quality evaluation for all players implied in these new hybrid services. A review of current standards and trends on the field of video quality...
In P2P video streaming systems, the neighbor selection algorithm is one of the fundamental components that affects performance. Although a few neighbor selection methodologies have been proposed, none of them takes into consideration QoE metrics reported by peers as a parameter for decisions. In this work, we present a new metric that quantifies the QoE as a function of the number of absences of pieces...
In Model-Driven Engineering (MDE) giving a precise definition of quality models, identifying which quality attributes are of interest for specific stakeholders, and how relating and aggregating together quality attributes are still open issues. The main limitations of currently available quality approaches are limited extensibility, artifact specificity, and manual assessment. This paper proposes...
In this paper, we propose a novel reduced-reference quality assessment metric for image super-resolution (RRIQA-SR) based on the low-resolution (LR) image information. First, we use the Markov Random Field (MRF) to model the pixel correspondence between LR and high-resolution (HR) images. Based on the pixel correspondence, we predict the perceptual similarity between image patches of LR and HR images...
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