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The reliable estimation of video quality has become increasingly important with the proliferation of online video services and users becoming more quality aware. A multitude of objective video quality assessment (VQA) metrics with various performance and complexity have been proposed. However, their applicability in real-world scenarios is limited by the lack of clear interpretations of how the metric...
With the increased focus on visual attention (VA) in the last decade, a large number of computational visual saliency methods have been developed. These models are evaluated by using performance evaluation metrics that measure how well a predicted map matches eye-tracking data obtained from human observers. Though there are a number of existing performance evaluation metrics, there is no clear consensus...
The procedures commonly used to evaluate the performance of objective quality metrics rely on ground truth mean opinion scores and associated confidence intervals, which are usually obtained via direct scaling methods. However, indirect scaling methods, such as the paired comparison method, can also be used to collect ground truth preference scores. Indirect scaling methods have a higher discriminatory...
With the rapid growth in video-based services, and as users are becoming increasingly quality-aware, the reliable estimation of video quality has become extremely important. While a multitude of objective Video Quality Assessment (VQA) metrics with various performance and complexity have been proposed, the nonlinearity of video quality and the lack of clear interpretations of the metrics make difficult...
Following the idea of improving our previous work on dynamic handwritten signature recognition on portable devices, a performance evaluation in a mobile scenario was done. A database with 11 users and 8 mobile devices (using stylus and finger) has been collected in order to study different parameters such as screen size, operative system and the interoperability between the devices. The evaluation...
A quantitative predictive performance evaluation of seventeen full-reference image quality assessment metrics has been conducted in the present work. The process has been made over six publicly available subjectively rated image quality databases for four degradation types namely JPEG and JPEG2000 compression, Gaussian blur and Gaussian noise. Results show that there is no significant impact of the...
Weight is a biometric trait which has been already studied in both the forensic and medical domains. In many practical situations, such as videosurveillance, weight can provide useful information for re-identification purposes but needs to be estimated from visual appearance (images or video). In this work we study the feasibility of weight estimation from anthropométrie data directly accessible...
A proxy cache has quite a few difficult jobs to do. It is hard for people to effectively and efficiently do the maintenance work needless of mentioning the performance tuning work. In this paper we study the widely used proxy caching server--Squid. It suffers with well-designed tool to the management or evaluation of its performance or capability, which motivates us to design and implement friendly...
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