Eliminating material dependency in spectra measurement via non-neighbouring band regression

Hui Liang Shen, Quan Geng Ge, Zhi Huan Zheng, Xin Du, Si Jie Shao, John Haozhong Xin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

A multispectral imaging system, after necessary calibration, can measure the spectral reflectances of colour samples accurately at a high spatial resolution. A limitation is that agreement of its measurements with those of a reference spectrophotometer is affected by the reflective characteristics of sample materials. The state-of-the-art methods aim to improve interinstrument agreement using the spectral values of neighbouring bands. However, it is observed that non-neighbouring bands are more effective in modelling interinstrument agreement. Inspired by this observation, the present paper proposes a method for eliminating material dependency by least-squares regression among non-neighbouring spectral bands. The fundamental issue of band selection is solved using a binary differential evolution algorithm. Experimental results confirm that the proposed method is effective in reflectance correction in terms of both spectral and colorimetric accuracy. The method is of practical application to multispectral imaging systems when measuring the spectral reflectances of colour samples with different materials.
Original languageEnglish
Pages (from-to)186-192
Number of pages7
JournalColoration Technology
Volume132
Issue number2
DOIs
Publication statusPublished - 1 Apr 2016

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Chemical Engineering(all)
  • Materials Science (miscellaneous)

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