Estimation of optoelectronic conversion functions of imaging devices without using gray samples

Hui Liang Shen, John Haozhong Xin, Dong Xiao Yang, Dong Wu Lou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


In the colorimetric or spectral characterization of imaging devices such as digital cameras and scanners, the optoelectronic conversion functions (OECFs) are traditionally obtained from standard gray samples. However, these gray samples are sometimes unavailable when conducting color characterization. We propose an efficient method for recovering OECFs by using nongray samples, based on the finite-dimensional modeling of spectral reflectance and the second-order polynomial fitting of OECFs. Experimental results indicate that the accuracy of the estimated OECFs are close to those obtained from gray samples, with the correlation coefficients R2 larger than 0.995. The proposed method should be useful in colorimetric and spectral characterization of imaging devices by using custom-made color samples in textile or other industries, when standard gray samples are not available and not easily made.
Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalColor Research and Application
Issue number2
Publication statusPublished - 1 Apr 2008


  • Color characterization
  • Color imaging
  • Color measurement
  • Input devices
  • Linear model
  • OECF

ASJC Scopus subject areas

  • Chemical Engineering(all)


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