Adaptive Source Models for Reversible Compression of Digitized Images PDF Download
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Author: Keshi Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 224
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Author: Keshi Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 224
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Author: Joshua Ka-Wing Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 61
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Book Description
In this thesis, I designed and implemented a model-adaptive data compression system for the compression of image data. The system is a realization and extension of the Model-Quantizer-Code-Separation Architecture for universal data compression which uses Low-Density-Parity-Check Codes for encoding and probabilistic graphical models and message-passing algorithms for decoding. We implement a lossless bi-level image data compressor as well as a lossy greyscale image compressor and explain how these compressors can rapidly adapt to changes in source models. We then show using these implementations that Restricted Boltzmann Machines are an effective source model for compressing image data compared to other compression methods by comparing compression performance using these source models on various image datasets.
Author: Mohammad El-Ghoboushi
Publisher: GRIN Verlag
ISBN: 3656932832
Category : Computers
Languages : en
Pages : 85
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Master's Thesis from the year 2014 in the subject Computer Science - Software, , course: Image Processing, language: English, abstract: In this thesis various methods for lossless compression of source image data are analyzed and discussed. The main focus in this work is lossless compression algorithms based on context modeling using tree structure. We are going to compare CALIC, GCT-I algorithms to the JPEG2000 standard algorithm which will be considered the reference of comparison. This work includes research on how to modify CALIC algorithm in continuous-tone mode by truncating tails of the error histogram which may lead to improve CALIC compression performance. Also, we are going to propose a modification to CALIC in binary mode by eliminating error feedback mechanism. As when any pixel to be encoded has a different grey level than any of the neighboring pixels, CALIC triggers an escape sequence that switches the algorithm from binary mode to continuous-tone mode. Which means in this case the pixel will be treated as if it was in continuous-tone region. This minor modification should improve CALIC performance in binary images. Finally, we are going to discuss the GCT-I on medical images and compare results to the JPEG2000 standard.
Author: Utku Yurday
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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Author:
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ISBN:
Category : Imaging systems in medicine
Languages : en
Pages : 544
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 560
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Author: Akmal A. Younis
Publisher:
ISBN:
Category : Diagnostic imaging
Languages : en
Pages : 208
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Author:
Publisher:
ISBN:
Category : Image compression
Languages : en
Pages : 268
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Author: Khalid Sayood
Publisher: Morgan Kaufmann
ISBN: 0128097051
Category : Computers
Languages : en
Pages : 792
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Book Description
Introduction to Data Compression, Fifth Edition, builds on the success of what is widely considered the best introduction and reference text on the art and science of data compression. Data compression techniques and technology are ever-evolving with new applications in image, speech, text, audio and video. This new edition includes all the latest developments in the field. Khalid Sayood provides an extensive introduction to the theory underlying today's compression techniques, with detailed instruction for their applications using several examples to explain the concepts. Encompassing the entire field of data compression, the book includes lossless and lossy compression, Huffman coding, arithmetic coding, dictionary techniques, context based compression, and scalar and vector quantization. The book provides a comprehensive working knowledge of data compression, giving the reader the tools to develop a complete and concise compression package. - Explains established and emerging standards in- depth, including JPEG 2000, JPEG-LS, MPEG-2, H.264, JBIG 2, ADPCM, LPC, CELP, MELP, iLBC and the new HEVC standard - Includes more coverage of lattices in vector quantization - Contains improved and expanded end-of-chapter problems - Source code is provided via a companion website that gives readers the opportunity to build their own algorithms and choose and implement techniques in their own applications
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 772
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Book Description
