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dc.contributor.authorDung, Lan-Rongen_US
dc.contributor.authorChiang, Tsung-Hsien_US
dc.date.accessioned2014-12-08T15:14:28Z-
dc.date.available2014-12-08T15:14:28Z-
dc.date.issued2007en_US
dc.identifier.isbn978-1-4244-1524-3en_US
dc.identifier.urihttp://hdl.handle.net/11536/11011-
dc.identifier.urihttp://dx.doi.org/10.1109/BIOCAS.2007.4463330en_US
dc.description.abstractThis paper proposes an efficient framework of high-quality image compression method for upper Gastrointestinal tract endoscopy images. The proposed DEWC coding method saves traditional image preprocessing computations, such as demosaicking and color-space transformation, and directly utilizes raw image data acquired from CMOS sensor. X G and B band image are then separately encoded by wavelet-based SPECK coding. In a cardinal GI tract environment, the spatial frequency distribution of red component is lower than green or blue, and green component is relatively high while compared to blue and red components. DEWC coding saves more bits on red band while allocating more bits on green and blue bands. Therefore, under a fixed compression ratio, such non-uniform bit-rate allocation may earn a better image quality. To measure quality-loss in non-uniform bit-rate allocation, a quality quantified measurement called color-distortion based on CIEE94 color-difference formula is also proposed. By using analytical result of color-distortion in bit-rate and bit-rate-difference analysis, an optimal/suboptimal bit-rate allocation scheme can be found by solving linear equations derived from the relationship of color-distortion and bit-rate-difference. When comparing to general JPEG2000 compression standard, the experimental result shows that proposed DEWC coding has a better image quality in color-distortion measurement and more efficient performance in execution time.en_US
dc.language.isoen_USen_US
dc.subjectgastrointestinal endoscopyen_US
dc.subjectDWTen_US
dc.subjectJPEG2000en_US
dc.subjectimage compressionen_US
dc.titleHigh-quality image compression for gastrointestinal endoscopeen_US
dc.typeProceedings Paperen_US
dc.identifier.doi10.1109/BIOCAS.2007.4463330en_US
dc.identifier.journal2007 IEEE BIOMEDICAL CIRCUITS AND SYSTEMS CONFERENCEen_US
dc.citation.spage146en_US
dc.citation.epage149en_US
dc.contributor.department交大名義發表zh_TW
dc.contributor.departmentNational Chiao Tung Universityen_US
dc.identifier.wosnumberWOS:000255659700037-
Appears in Collections:Conferences Paper


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