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.
Results
Showing 1 to 20 of 47 for “"bitrate"”.
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Advanced modelling of adaptive bitrate selection
… usually managed by a sub-module of the adaptive bitrate selection function. However, these sub-components interact in a non-trivial manner. For example, while on-off chunk scheduling helps to prevent buffer overflow, it negatively affects the TCP throughput. Hence, these complex interactions …
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Image enhancements for low-bitrate videocoding
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Forensic Reconstruction of Fragmented Variable Bitrate MP3 files
… files and performs statistical analysis on the bitrates of these files.
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Visual perception based bit allocation for low bitrate video coding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Coding and Transmission of Digital Video on the Internet
… for the design and implementations of a low bitrate and robust video coding and transmission scheme. This thesis tackles problems in both coding and transmission. For coding, a hybrid coding scheme is proposed to increase the robustness. For transmission, an effective dependency isolation …
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Using enhancement data for deinterlacing 1080i high definition television
… A receiver compatible system can add a small bitrate enhancement stream and enable new receivers to easily deinterlace l080i streams. Old receivers can ignore this stream while decoding the original lo8oi stream. Since the enhancement stream has a low bitrate, we can use this system alongside …
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Dynamic Switching of GOP Configurations in High Efficiency Video Coding (HEVC) using Relational Databases for Multi-objective Optimization
… Optimal and dynamic management of video bitrate, quality and energy needs to take into account their inter-dependencies. With emerging network generations providing higher bandwidth rates, there is also a growing need to communicate video with the best quality subject to the availability …
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Analysis of one-dimensional transforms in coding motion compensation prediction residuals for video applications
… residuals can provide significant additional bitrate savings. However, this requires optimization over all of the available transforms to minimize the overall bitrate, which can be expensive in terms of time and computation. In this thesis, we examine the use of only the horizontal and …
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End-to-end video adaptation using frame rate optimization and TCP-friendly rate control
… video rate control, which aims to adjust video bitrate to meet the network constraint. To that end, we propose a joint source rate and congestion control scheme called video TCP-friendly rate control (VTFRC) that incorporates the video bit rate characteristic into the TFRC rate. VTFRC uses a …
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Rate control and bit allocations for JPEG transcoding
… zero-valued quantized DCT coefficients and the bitrate. Using this relationship and a histogram of coefficients, it is possible to determine an effective way to scale the quantization tables of an image to approach a target filesize. As the image is being transcoded, an intra-image process makes …
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Neural adaptive video streaming with pensieve
Client-side video players employ bitrate adaptation algorithms to cater to the ever-growing QoE requirements of users. These ABR algorithms must balance multiple QoE factors, such as maximizing video bitrate and minimizing rebuffering times. Despite the abundance of recently proposed ABR …
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Lossy compression and real-time geovisualization for ultra-low bandwidth telemetry from untethered underwater vehicles
… by seawater, and tradeoffs between frequency, bitrate and environmental effects result in data rates for acoustic modems that are routinely as low as tens of bits per second. These data rates usually limit telemetry to state and health information, to the exclusion of mission-specific science …
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A secure HEVC video watermarking scheme for authentication and copyright purposes
… first and second video compression at different bitrate, with accuracy improvement up to 42% compared to the-state-of-the-art schemes. Moreover, the second proposed scheme shows significant improvement; up to 8.23% of robustness against recompression attack, 95% against channel noise attacks, and …
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Provider-Controlled Bandwidth Management for HTTP-based Video Delivery
… the network impact of multiple adaptive bitrate clients competing for limited network resources, and developing schemes for enforcing fair access to network resources.</p><p>The main contribution of this dissertation is the definition of segment-level client and network techniques for …
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Study of QoE for DASH at Sub-representational Level
… streaming. It enables the player to adapt to the bitrate of the video while streaming to ensure continuous playback. DASH provides sub-representation structure that can be extrapolated for refining QoE metric with multiple temporal quality operating point for a given spatial quality i.e. PSNR. In …
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Design of Scalable On-Demand Video Streaming Systems Leveraging Video Viewing Patterns
… called Joint-Family which enables adaptive bitrate streaming (ABR) in P2P VoD, supporting user viewing patterns. We first provide evidence of such user viewing behavior from data collected from a nationally deployed VoD service. In contrast to using a simplistic popularity-based placement …
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Dynamically Reconfigurable Architectures and Systems for Time-varying Image Constraints (DRASTIC) for Image and Video Compression
… network systems. For different scenarios, power, bitrate and image quality can impose significant time-varying constraints. For example, mobile devices (e.g., phones, tablets, laptops, UAVs) come with significant constraints on energy and power. Similarly, computer networks provide time-varying …
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Coherent multi-photon interference and compensation of polarization dispersion
… an important source of signal distortion in high-bitrate communications arising from unwanted birefringence in the fiber. We will describe theoretical analysis of compensated PMD systems, as well as our theoretical and experimental effeots to develop novel PMD compensators.
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Design and implementation of a methodology to characterize indoor visible light communication channels
… delay spread, coherence bandwidth, and maximum bitrate. Our method accurately estimates path loss, with a measured value of $15$ dB at $30$ cm transceiver distance, consistent with simulation results in the literature. However, our lowest value for the RMS delay spread is $17.4132$ ns, greater …
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