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 12 of 12 for “"Bit allocation"”.
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Learning Z-Order Indexes with Dynamic Bit Allocation
… indexes using an approach we refer to as dynamic bit allocation, which considers not only which columns to include, but also the weight to put on each column. Our learned Z-order indexes outperform existing techniques by up to 11× in query time and up to 30.2× in rows scanned, revealing the …
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Adaptive bit allocation for spatiotemporal subband coding using vector quazntization
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1990.
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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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A 32 sub-band/transform coder incorporating vector quantizing for adaptive bit allocation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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A Study of Perceptually Tuned, Wavelet Based, Rate Scalable, Image and Video Compression
… (HVS) and extends this scheme to handle optimal bit allocation among multiple bands, such as Y, Cb, and Cr. Our experimental image codec shows very exciting results in compression performance and visual quality comparing to the new wavelet based international still image compression standard - …
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Hash code learning for large scale similarity search
… contributions. Firstly, we improve upon the bit allocation strategy of Signal-to-Noise Ratio Maximization Hashing (SMH) to produce longer hash codes without a deterioration in retrieval performance as measured by mean average precision (MAP). The proposed bit allocation strategy seamlessly …
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Significance-linked connected component analysis+ for wavelet image coding
… SLCCA. For example, for the Lena image, at 0.1 bit/pixel, SLCCA+ outperforms SLCCA by 0.1 dB in PSNR. This outstanding performance is achieved without using any optimal bit allocation procedure. Thus both the encoding and decoding procedures are fast.
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Vector quantization applied to speech coding in the wireless environment
… encoder and speech filters, determine an optimal bit allocation scheme, and/or create an error correction scheme, as desired. Using a channel simulation tool such as BERSIM, the user can create bit error patterns to corrupt the data and then decode the speech for playback and analysis. The system …
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Error control for scalable image and video coding
… between the unequal importance of the scalable bit stream and the agnostic nature of packet losses in the network. This thesis investigates three methods to combat the detrimental effects of random packet losses to scalable images and video, namely the error resilient method, the error …
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Optimizing communication performance of low-resolution ADC systems with hybrid beamforming
… First, problems of optimizing the number of ADC bits and designing analog combiners with fixed-resolution ADCs are tackled to design an energy-efficient receiver architecture with phase shifter-based hybrid beamforming. A hybrid receiver architecture with resolution-adaptive ADCs for mmWave …
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Artistic and semantic progressive image coding
… However, the compressed quality is low at low bitrates and it entirely ignores the semantics of images. We propose to render different artistic visual effects and leverage semantic information in the images. The key insight is human visual system is more sensitive to luminance and semantic …
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Distributed Estimation and Performance Limits in Resource-constrained Wireless Sensor Networks
… noise modeling of the quantization process. The bit allocation problem based on the framework is also investigated. </p> <p>A source localization problem in a large-scale sensor network is explored. The maximum-likelihood (ML) estimator based on the quantized data from local sensors and its …