Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Perceptual Quality"”.
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Blind Estimation of Perceptual Quality for Modern Speech Communications
… communication technologies expose users to perceptual quality degradations that were not experienced earlier with conventional telephone systems. Since perceived speech quality is a major contributor to the end user's perception of quality of service, speech quality estimation has become an …
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Optimizing Perceptual Quality Prediction Models for Multimedia Processing Systems
L'abstract è presente nell'allegato / the abstract is in the attachment
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Development and objective perceptual quality assessment of monaural and binaural noise reduction schemes for hearing aids
Menschen mit einer Hörproblematik haben große Schwierigkeiten in lauten und widerhallenden Umgebungen zu kommunizieren. Gewöhnlich benötigen sie einen höheren Störpegelabstand als normal hörende Menschen, um dieselbe Hörleistung zu erzielen. Die vorliegende Dissertation widmet sich dieser …
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Finding perceptually optimal operating points of a real time interactive video-conferencing system
… time video-conferencing systems in locating a perceptually optimal operating point under various network and conversational conditions. In order to determine the perceptually optimal operating point of a video-conferencing system, we must first be able to conduct a fair assessment of the …
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Design and evaluation of real-time Voice-Over-IP (VOIP) systems with high perceptual conversational quality
… communication systems that can achieve high perceptual quality for their users. It focuses on the fundamental understanding of multiple quality aspects perceived and their trade-offs in the design of run-time control schemes that adapt to changing network conditions and expectations of the …
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Individual recognition from low quality and occluded images and videos using GAN
… problem of recognising degraded faces from low-quality images and videos mostly remains unsolved. In recent times, we have seen a breakthrough in the perceptual quality of image enhancement with the recovery of the fine texture details and sharpness of degraded images. Several state-of-the-art …
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A Unified Framework for Image Modeling and Estimation Using Measurement Constraints
… significant improvements in terms of both perceptual quality as well as mean-squared error over classical approaches such as adaptive Wiener filtering. Under appropriate conditions, a variety of classical wavelet-domain image models and denoising algorithms are shown to be subsumed by the …
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Complexity management of H.264/AVC video compression.
… framework is proposed for maximising the perceptual quality of coded video in a real-time processing-power constrained environment. A real-time frame-level control algorithm and a per-frame complexity control algorithm are combined in order to manage the encoding process such that a high …
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An Application of Spectral Translation and Spectral Envelope Extrapolation for High-frequency Bandwidth Extension of Generic Audio Signals
… extension of audio signals, a means of improving perceptual quality for sound which has been previously low-pass filtered or downsampled (typically due to storage considerations). The algorithm combines an application of the modulation theorem for discrete Fourier transform to regenerate the …
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Structure Mediated Use of Local-Global Duality in Image and Video Processing
… strengths in improving both objective and perceptual quality of the processed image. In many of the applications that we consider, global smoothness properties of the image are captured by linear transform-based representations while local edge-based properties are captured with a …
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Real-time data flow models and congestion management for wire and wireless IP networks
… the video throughput performance and impairs its perceptual quality and may interrupt the display. Congestion control may take the form of rate adjustment through mechanisms by attempt to minimize the probability of congestion by adjusting the rate of the streaming video to match the available …
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Fast Schemes for Video Denoising and Compressed Domain Image Size Change
… such as the Fourier transform. Huge gains in perceptual quality and PSNR are obtained with much less computation. We also provide an analysis of the aliasing effects of our scheme. Further, we describe how this scheme can be applied to spatially scalable video compression.
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Deep neural networks for medical image super-resolution
… super-resolution. In addition to general image quality assessments, task-specific objective and subjective evaluation metrics are implemented for comprehensive comparisons. Specifically, the proposed approaches contain three directions, achieving state-of-the-art performance on diverse medical …
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Data-driven Automatic Edge Sharpening
… enhances sharpness of images and thereby their perceptual quality. Most existing enhancement techniques require user input to improve the perception of the scene in a manner most pleasing to the particular user. Our goal of image enhancement is to improve the perception of sharpness in digital …
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Automatic input rectification
… a user study designed to evaluate the subjective perceptual quality of outputs from benign but atypical inputs that have been automatically rectified by SOAP to conform to the learned constraints. Specifically, we obtained benign inputs that violate learned constraints, used our input rectifier to …
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A quantitative analysis and assessment of the performance of image quality metrics
Image quality assessment addresses the distortion levels and the perceptual quality of a restored or corrupted image. A plethora of metrics has been developed to that end. The usual mean of success of an image quality metric is their ability to agree with the opinions of human subjects, often …
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Robust Speech Filter And Voice Encoder Parameter Estimation using the Phase-Phase Correlator
… Prediction encoder that provides improved audio quality for voiced, unvoiced, and transition speech segments. This is achieved by applying a statistical test to robust Mahalanobis distances for identifying the outliers in the corrupted speech signal, which are then replaced with filtered signals. …
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Efficient Approaches for Voice Change and Voice Conversion Systems
… proposed voice change system achieves the same quality as the baseline approach but requires much less computational complexity and satisfies the requirement of real-time. Moreover, the proposed system has been implemented in C language and was released as a commercial software application. The …
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The Design of A Multi-party VoIP Conferencing System
… unreliable, and it degrades the conversational quality of real-time multi-party conferencing. Delay disparities may cause unbalanced silence periods, and losses and jitters may affect the intelligibility of speech segments received. We collect real Internet traces from the PlanetLab and classify …
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Complexity adaptation in video encoders for power limited platforms
… mentioned above is proposed for maximizing the perceptual quality of coded video on a complexity constrained platform.
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