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Pàgina inicial > Articles > Articles publicats > JPEG2000 ROI coding with fine-grain accuracy through rate-distortion optimization techniques |
Data: | 2009 |
Resum: | Region of interest (ROI) coding is a feature of prominent image coding systems that enables the specification of different coding priorities to certain regions of the image. JPEG2000 provides ROI coding through two mechanisms: either modifying wavelet coefficients or using rate-distortion optimization techniques. Although ROI coding methods based on the modification of wavelet coefficients provide an excellent accuracy to delimit the ROI area (referred to as fine-grain accuracy), they significantly penalize the coding efficiency. On the other hand, methods based on rate-distortion optimization improve the coding efficiency but, so far, have not been able to achieve the intended fine-grain accuracy. This letter introduces two ROI coding methods that, using rate-distortion optimization techniques, achieve a fine-grain accuracy, comparable to the one obtained when wavelet coefficients are modified, and are competitive in terms of coding efficiency. |
Ajuts: | Ministerio de Educación y Ciencia TSI2006-14005-C02 Ministerio de Educación y Ciencia MEC-BPD-2007-1040 Agència de Gestió d'Ajuts Universitaris i de Recerca 2005/SGR-00319 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | JPEG2000 ; Rate-distortion optimization ; Region of interest coding |
Publicat a: | IEEE signal processing letters, Vol. 16, no. 1 (January 2009) , p. 45-48, ISSN 1070-9908 |
Post-print 4 p, 2.0 MB |