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 148 for “"data compression"”.
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Customized Data Compression: Automatically Synthesizing Effective Data Compression and Decompression Algorithms
With the exponential increase in the amount of data humans are generating, there is a progressive need for developing effective high-speed data compression techniques. However, developing an algorithm that just compresses data well is not sufficient. A good compression technique should also …
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Energy aware lossless data compression
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Data Compression with Relative Entropy Coding
Data compression forms the foundation of our Digital Age, enabling us to store, process and communicate more information than ever before. Over the last few years, machine learning-based compression algorithms have revolutionised the field and surpassed the performance of traditional methods. …
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The optimization of data compression algorithms
Thesis (Civ.E.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Optimizing Data Compression via Data Reordering Strategies
… and cost-effectiveness of handling large tabular datasets stored in databases, a range of data compression techniques are employed. Among these, dictionary-based compression methods such as Lz4, Gzip, and Zstandard are commonly utilized to decrease data size. However, while these traditional …
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DATA COMPRESSION BY USING SYMMETRICAL COMPONENT TRANSFORM
… concerns the effectiveness of image data compression for digital signals using a new transform method termed the symmetrical com-ponent transform. This transform is based on a previously described matrix expansion of a spatially discrete image termed the symmetrical component …
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Applications of fractals to image data compression
… storage and transmission technology. Image data compression is required to permit further use of digital image processing. Conventional image compression techniques based on statistical analysis have reached a saturation level so it is necessary to explore more radical methods. This thesis …
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Approximation algorithms for grammar-based data compression
… research. Most importantly, there is a link to data compression; instead of storing a long string, one can store a small grammar that generates it. A small grammar for a string also naturally brings out underlying patterns, a fact that is useful, for example, in DNA analysis. Moreover, the size …
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Image data compression using multiple bases representation
The compression of gray scale images is an interesting problem because of the large number of variations between data elements while maintaining a high degree of correlation. The goal of image data compression is to obtain the best possible image for a fixed information rate. In recent years, there …
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Enabling Approximate Storage through Lossy Media Data Compression
… of the memory subsystem due to their large datasets and need to frequently access memory. RMS applications, such as those in machine learning, deliver intelligent analysis and decision making through their ability to learn, identify, and create complex data models. To meet growing demand for …
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Scan test data compression using alternate Huffman coding
… a good method for statistically compressing test data with high compression rates. Unfortunately, the on-‐chip decoder to decompress that encoded test data after it is loaded onto the chip may be too complex. With limited die area, the decoder complexity becomes a drawback. This makes Huffman …
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Wavelets for approximate Fourier transform and data compression
… to the developments of several wavelet-based data compression techniques for image and seismic data. We propose an algorithm that uses the discrete wavelet transform (DWT) as a tool to compute the discrete Fourier transform (DFT). The classical Cooley-Tukey FFT is shown to be a special case of …
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Lossless quantum data compression and secure direct communication
Diese Dissertation behandelt die Kodierung und Verschickung von Information durch einen Quantenkanal. Ein Quantenkanal besteht aus einem quantenmechanischen System, welches vom Sender manipuliert und vom Empfänger ausgelesen werden kann. Dabei repräsentiert der individuelle Zustand des Kanals die …
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Entropy in Data Compression, Additive Combinatorics and Probability
… In the first part, the problem of lossless data compression with side information available to both the encoder and the decoder is considered. The finite-blocklength fundamental limits of the best achievable performance are defined, in two different versions of the problem: Reference-based …
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Data compression, storage, and viewing in classroom learning partner
… we present the design and implementation of a data storage and viewing system for students' classroom work. Our system, which extends the classroom interaction system called Classroom Learning Partner, collects answers sent by students for in-class exercises and allows the teacher to browse …
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Exploring data compression for a distributed aerial relay application
… the signals across the relays. A distributed compression algorithm is proposed and applied to both simulated and collected data. We conclude that a compression algorithm across the relays offers a substantial decrease in bit rate requirement, and that a preprocessing step can make the …
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Architectural Support for Effective Data Compression In Irregular Applications
… linear algebra, exhibit frequent indirect, data-dependent accesses to single or short sequences of elements that cause high main memory traffic and limit performance. Data compression is a promising way to accelerate irregular applications by reducing memory traffic. However, software …
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New algorithms and lower bounds for sequential-access data compression
This thesis concerns sequential-access data compression, i.e., by algorithms that read the input one or more times from beginning to end. In one chapter we consider adaptive prefix coding, for which we must read the input character by character, outputting each character's self-delimiting codeword …
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Qualitative Evaluation of Data Compression in Real-time Ultrasound Imaging
… of observer confidence with increasing compression ratios. The histogram analysis showed a linear increase in standard deviation values, indicating a linear scatter in pixel intensity, with increasing compression ratios. Although higher compression levels were evaluated, only video clips …
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Data Compression Strategies for RDAT/DDS Media in Hostile Environments
… propagation in magnetically recorded compressed data when severe environmental conditions result in uncorrected channel errors.<br/><br/>The tape format DDS is examined and a computer simulation of its error correction procedures is described. This software implementation uses explicit parity …
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