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 32 for “"Lossy compression"”.
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Lossy compression of speech using perceptual criteria
The research contained in this thesis provides an investigation into a new method of minimising the perceptual differences when encoding digitised speech. An application of the perceptual criteria is described in the context of a codebook encoding methodology Some of the background studies covered …
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Two algorithms for Lossy compression of 3D images
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Variable-rate lossy compression and its effects on communication networks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Lossy compression and real-time geovisualization for ultra-low bandwidth telemetry from untethered underwater vehicles
… dive to the next. The system uses standard lossy compression techniques to lower required data rates to those supported by commercially available acoustic modems (O(10)-O(100) bits per second). As part of the system, a method for compressing time-series science data based upon the Discrete …
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Lossy compression and real-time geovisualization for ultra-low bandwidth telemetry from untethered underwater vehicles
… dive to the next. The system uses standard lossy compression techniques to lower required data rates to those supported by commercially available acoustic modems (O(10) - O(100) bits per second).
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From detection to optimization: impact of soft errors on high-performance computing applications
… to small errors allows optimizations such as lossy compression on high-cost data transfers. Lossy compression adds small user controllable amounts of error when compressing data, to reduce data size before expensive data transfers saving time. This dissertation investigates and improves the …
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Accelerating distributed neural network training with network-centric approach
… with computation, and apply a more aggressive lossy compression algorithm to all the information exchanged among nodes than traditional distributed algorithms. Second, exploiting unique characteristics of gradient values, we propose a lossy compression algorithm, optimized for compressing …
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Low-complexity methods for image and video watermarking
… additive noise, scaling, low-pass filtering, and lossy compression. This method also requires a small amount of computations. The method generates a set of evenly distributed codewords that are constructed via an iterative algorithm. Every message bit is represented by one of these codewords and …
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Combinatorial joint source-channel coding
… solutions for applications requiring both lossy compression and noise resilience reflect this approach. However, in the adversarial setting, with worst case errors, separation based schemes are far from being even asymptotically optimal. This work investigates fundamental limits, …
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NEW PARADIGMS IN SOURCE CODING AND CHANNEL CODING
The two pillars of information theory, data compression and channel coding, are often considered as having reached maturity a long time ago. Our research brings fresh perspectives to both these areas by challenging long-standing assumptions and introducing new frameworks. The Shannon entropy and …
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Scalable methods for storage, processing and analysis of sequencing datasets
… improving sensitivity. Second, we describe a lossy compression method for quality scores within sequencing datasets that strikingly improves the downstream accuracy for genotyping. Third, we introduce a Bayesian framework for accurate diploid and polyploid haplotype reconstruction of an …
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Enabling Approximate Storage through Lossy Media Data Compression
… and presents our own contribution that uses lossy compression to reduce the storage cost of media data.
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Unsupervised Classification of Music Signals: Strategies Using Timbre and Rhythm
… different for other instruments. The effect of lossy compression on these same timbre features is also investigated. In the area of rhythm, a new tempo tracking tool is provided which produces a series of histograms containing beat and sub-beat information throughout the course of a musical …
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A study of probability distributions of DCT coefficients in JPEG compression
The Discrete Cosine Transform (DCT) used in JPEG compression has shown excellent energy compaction properties that rival that of the ideal Karhunen-Loeve Transform. Lossy compression in JPEG is achieved by distorting 8x8 block DCT coefficients through quantization. It has been shown in literature …
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Compressive algorithms for search and storage in biological data
… accuracy. This filtering step allows for fast lossy compression of quality scores.
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Oblivious data hiding : a practical approach
… payload. In particular, cropping-resampling and lossy compression types of noninvertible attacks are considered in this dissertation work.
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A probabilistic graphical model based data compression architecture for Gaussian sources
… expressed as correlation structures. A data compression algorithm uses the knowledge of these structures to map the original data to a different encoding. The two aspects of data compression, source modeling, ie. using knowledge about the source, and coding, ie. assigning an output sequence …
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Techniques for the Development of Time-Constraint Telemetric Data Processing System
… research publications devoted to the lossless compression methods indicates growing interest to this area of the engineering design. This interest is explained by the rapid development of the communication and data storage facilities. Compression theory has a long history and the subject is …
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The contour tree image encoding technique and file format
… efficient manner and is the basis for an image compression method. Simplification of the contour tree has been undertaken by merging contour tree nodes thus lowering the contour tree's entropy. This can be exploited by the contour coder to increase the image compression ratio. By applying …
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A lossy, dictionary -based method for short message service (SMS) text compression
Short message service (SMS) message compression allows either more content to be fitted into a single message or fewer individual messages to be sent as part of a concatenated (or long) message. While essentially only dealing with plain text, many of the more popular compression methods do not …
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