Comparative evaluation of spectral transforms for multispectral image coding in terms of colnr degradation

Yuri Murakami, Hiroyuki Manabe, Takashi Obi, Masahiro Yamaguchi, Nagaaki Ohyama

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Recently, multispectral images have been utilized for high fidelity color reproduction through visual telecommunication systems and its compression schemes have been required. However multispectral image coding considering color degradation has not been established. This article presents a comparison of four spectral transforms presented before to find out which transform is more suitable to a spectral decorrelation scheme in transform coding of multispectral images. Transforms dealt with in this paper are Karhunen-Loeve transform (KLT), weighted KLT (WKLT), one mode analysis (OMA) and a transform realizing compatibility to the conventional color systems, latter three of which are designed to represent spectral reflectance functions with small number of coefficients having small colorimetric errors. Through the theoretical and experimental comparisons, it is found that WKLT and OMA reduced colorimetric error compared to the others, where OMA is suitable when the rendering illuminations in the color reproduction can be assumed in advance and WKLT is applicable to other situations.

Original languageEnglish
Pages (from-to)76-81
Number of pages6
JournalOptical Review
Volume11
Issue number2
Publication statusPublished - 2004 Jan 1

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Keywords

  • Color reproduction
  • Decorrelation
  • KLT
  • Multispectral image
  • Spectral transform
  • Transform coding

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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