Unified feature analysis in different compressed domains

K. M. Au, Ngai Fong Law, W. C. Siu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

4 Citations (Scopus)

Abstract

Images can be compressed using different algorithms such as JPEG and JPEG 2000. Retrieving these kinds of images typically require processing them onto the uncompressed spatial form in which features are extracted for further analysis. This approach incurs many pre-processing operations, especially for large image archives. The objective of this paper is to study features that are common in these domains so that indexing can be done directly from their compressed domain. By deriving expressions for the lowpass filters in both block-based discrete cosine transform (DCT) and wavelet transform (WT), it is found that these two filters are very similar. In fact, it is shown that they are the same for the Haar wavelet kernel. Both theoretical and experimental studies show that features that are common to DCT and WT domains can be extracted. Also, the effect of compression ratios on these two formulations has been studied. It is found that despite the high compression ratio, features that are extracted from these two compressed domains still can have a large similarity.
Original languageEnglish
Title of host publicationICICS-PCM 2003 - Proceedings of the 2003 Joint Conference of the 4th International Conference on Information, Communications and Signal Processing and 4th Pacific-Rim Conference on Multimedia
PublisherIEEE
Pages71-75
Number of pages5
Volume1
ISBN (Electronic)0780381858, 9780780381858
DOIs
Publication statusPublished - 1 Jan 2003
EventJoint Conference of the 4th International Conference on Information, Communications and Signal Processing and 4th Pacific-Rim Conference on Multimedia, ICICS-PCM 2003 - Meritus Mandarin Singapore Hotel, Singapore, Singapore
Duration: 15 Dec 200318 Dec 2003

Conference

ConferenceJoint Conference of the 4th International Conference on Information, Communications and Signal Processing and 4th Pacific-Rim Conference on Multimedia, ICICS-PCM 2003
CountrySingapore
CitySingapore
Period15/12/0318/12/03

ASJC Scopus subject areas

  • Signal Processing
  • Media Technology
  • Computer Networks and Communications

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