Accurate spectral response measurement system for digital color cameras

Gao Wei Chang*, Zong Mu Yeh

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In imaging systems, color plays an essential role in conveying and recording visual information from the real world. To faithfully represent colors acquired from digital cameras, a spectral responsivity measurement system is proposed for those devices in this paper. For estimating spectral responsivities of digital color cameras, a filter-based optical system is designed with proper filter selections. Since the spectral filters primarily prescribe the optical characteristics of the system, the filter consideration is important to the optical design of the system with the presence of noise. A theoretica basis is presented to confirm that sophisticated filter selections can make this system as insensitive to noise as possible Also, we propose a filter selection method based on the orthogonal-triangular (QR) decomposition with column pivoting (QRCP). To investigate the noise effects, we assess the estimation errors between the actual and estimated spectra responsivities, with the different signal-to-noise ratio (SNR) levels of an eight-bit/channel camera. To demonstrate the effectiveness of this approach, the experimental results from the filter-based optical system with the spectral filters selected from the QRCP-based method is much less sensitive to noise than those with other filters from differenent selections. It is found that the measurement accuracy is fairly satisfactory.

Original languageEnglish
Title of host publicationProceedings of SPIE-IS and T Electronic Imaging - Color Imaging XII
Subtitle of host publicationProcessing, Hardcopy, and Applications
Publication statusPublished - 2007
EventColor Imaging XII: Processing, Hardcopy, and Applications - San Jose, CA, United States
Duration: 2007 Jan 302007 Feb 1

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherColor Imaging XII: Processing, Hardcopy, and Applications
Country/TerritoryUnited States
CitySan Jose, CA


  • Filter-based optical systems
  • Orthogonal-triangular (QR) decomposition with column pivoting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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