Improved subband-based and normal-mesh-based image coding

dc.contributor.authorXu, Di
dc.contributor.supervisorAdams, Michael David
dc.date.accessioned2007-12-19T22:16:05Z
dc.date.available2007-12-19T22:16:05Z
dc.date.copyright2007en_US
dc.date.issued2007-12-19T22:16:05Z
dc.degree.departmentDept. of Electrical and Computer Engineeringen_US
dc.degree.levelMaster of Applied Science M.A.Sc.en_US
dc.description.abstractImage coding is studied, with the work consisting of two distinct parts. Each part focuses on different coding paradigm. The first part of the research examines subband coding of images. An optimization-based method for the design of high-performance separable filter banks for image coding is proposed. This method yields linear-phase perfect-reconstruction systems with high coding gain, good frequency selectivity, and certain prescribed vanishing-moment properties. Several filter banks designed with the proposed method are presented and shown to work extremely well for image coding, outperforming the well-known 9/7 filter bank (from the JPEG-2000 standard) in most cases. Several families of perfect reconstruction filter banks exist, where the filter banks in each family have some common structural properties. New filter banks in each family are designed with the proposed method. Experimental results show that these new filter banks outperform previously known filter banks from the same family. The second part of the research explores normal meshes as a tool for image coding, with a particular interest in the normal-mesh-based image coder of Jansen, Baraniuk, and Lavu. Three modifications to this coder are proposed, namely, the use of a data-dependent base mesh, an alternative representation for normal/vertical offsets, and a different scan-conversion scheme based on bicubic interpolation. Experimental results show that our proposed changes lead to improved coding performance in terms of both objective and subjective image quality measures.en_US
dc.identifier.urihttp://hdl.handle.net/1828/284
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectimage codingen_US
dc.subjectsubband codingen_US
dc.subjectwaveletsen_US
dc.subjectfilter-bank designen_US
dc.subjectcoding gainen_US
dc.subjectnormal meshesen_US
dc.subjectgeometric image representations subdivisionen_US
dc.subjectmultiresolutionen_US
dc.subjecttriangulationsen_US
dc.subject.lcshUVic Subject Index::Sciences and Engineering::Engineering::Electrical engineeringen_US
dc.titleImproved subband-based and normal-mesh-based image codingen_US
dc.typeThesisen_US

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