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 32 for “"Image Coding"”.
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Artistic and semantic progressive image coding
Progressive image coding provides web users a faster full-image preview when only a small fraction of the file has been transmitted. JPEG is the most widely used progressive compression technique. However, the compressed quality is low at low bitrates and it entirely ignores the semantics of …
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Structured vector quantizers in image coding
Image data compression is concerned with the minimization of the volume of data used to represent an image. In recent years, image compression algorithms using Vector Quantization (VQ) have been receiving considerable attention. Unstructured vector quantizers, i.e., those with no restriction on the …
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Reduction of blocking effect in image coding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Content-adaptive bi-level (facsimile) image coding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Predictive image coding with Pseudo-Laplacian edge detector
Several edge-adaptive dual-mode Predictive coding systems are proposed for encoding monochrome video signals. These algorithms use the Pseudo-Laplacian edge detector to switch between the textural coding and the edge coding. The one-dimensional Song DM coder and the two-dimensional weighted average …
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Significance-linked connected component analysis+ for wavelet image coding
… Analysis+ (SLCCA+) is a efficient wavelet image coding algorithm that extends SLCCA by using new data organization and representation (DOR) and SLCCA+ use a definition of context model for the adaptive arithmetic coding. Extensive computer experiments on both natural and texture images show …
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Interframe image coding with three-dimensional gradient motion estimation
Two new methods for coding image sequences in video conferencing systems are developed in this dissertation. A simple 3-D gradient operator is developed to estimate motion in an image sequence on a pixel-by-pixel basis. A stochastic 3-D gradient operator is also developed for a gradient calculation …
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Low power data-dependent transform video and still image coding
… work introduces the idea of data dependent video coding for low power. Algorithms for the Discrete Cosine Transform (DCT) and its inverse are introduced which exploit statistical properties of the input data in both the space and spatial frequency domains in order to minimize the total number of …
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A locally adaptive perceptual masking threshold model for image coding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Library-based image coding using vector quantization of the prediction space
Thesis (M.S.)--Massachusetts Institute of Technology, Program in Media Arts & Sciences, 1993.
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Spline wavelet image coding and synthesis for a VLSI based difference engine
The efficiency of an image compression/synthesis system based on a spline multi-resolution analysis (MRA) is investigated. The proposed system uses a quadratic spline wavelet transform combined with minimum-mean squared error vector quantization to achieve image compression. Image synthesis is …
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Low-complexity approximations for discrete transforms : design, fast algorithms, image coding, and use as a tool in statistical inference
… relevant transforms in the context of signal and image processing. Although the relevance of using these transforms has been widely corroborated in several studies, the computational costs required for their implementations can become prohibitive in contexts where we have large amounts of data …
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Global Optimization for Constrained Nonlinear Programming
… benchmarks and design filters for subband image coding. Much better results have been reported in comparison with other existing methods.
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The design, implementation and analysis of a wavelet-based video codec
… has been shown to be highly effective in image coding applications. This thesis describes the development of a new wavelet-based video compression algorithm which is based on the 3D wavelet transform, and requires no complicated motion estimation techniques. The proposed codec processes a …
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Techniques in image restoration and enhancement
Image processing in its broad sense pervades many areas but it is convenient to group it into three main sections, viz: image coding, usually for image transmission over telecommunication links; pattern recognition for detecting the presence of a particular distribution in an image which is …
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An investigation of neural networks for image processing applications
… networks and their application to aspects of image processing. Three neural network models, namely the backpropagation network, the Hopfield network and the competitive network, are studied. First, the learning algorithms for backpropagation networks and competitive neural networks are studied …
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Learning Sparse Graph Laplacian with K Eigenvector Prior via Iterative GLASSO and Projection
… then learned from data. One example use case is image coding, where the first eigenvector is pre-chosen to be constant, regardless of available observed data. Experimental results show that given the first K eigenvectors as a prior, the algorithm in this thesis outperforms competing graph …
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Transforms for prediction residuals in video coding
… Cosine Transform (DCT), is used to compress both image intensities in image coding and prediction residuals in video coding. Major prediction residuals include the motion compensated prediction residual, the resolution enhancement residual in scalable video coding, and the intra prediction …
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