On the tree-based embedded subband image coding /
This research develops innovative coding principles combined
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=736584241&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | This research develops innovative coding principles combined with new tree structures to advance the embedded tree coding technology. Embedded tree coding schemes, such as embedded zerotrees and spatial orientation trees, are among the most successful wavelet-based image compression techniques. These schemes are developed on the basis of the self-similarity of wavelet coefficients across different subbands. Despite their excellent performance, existing embedded tree coders are only applicable to square images, and the coefficient bits at different spatial locations are evenly interlaced in the encoded bit stream. To code any size of rectangular images, we propose an efficient inter-band mapping algorithm, the Generalized Self-Similarity Tree (GST). For intra-band image coding, we propose a new coding scheme, the compact quadtree (CQT). The proposed schemes are shown to outperform existing embedded tree coding methods in the literature. As an application of the CQT, a selective compression of medical images based on regions of interest (ROIS) is designed. We characterize the spatial similarity, that is the similarity of adjacent wavelet coefficients in a subband, and show that that this property plays an important role in the design of embedded tree coding schemes. To optimize the transmission sequence of wavelet coefficients for progressive visual communications, new methods are designed and analyzed. |
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| Item Description: | Vita. "Major Subject: Computer Science". |
| Physical Description: | xii, 107 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 103-106. |