Smartphone Modulated Colorimetric Reader with Color Subtraction

Y. Zhao, S.Y. Choi, J. Lou-Franco, J.L.D. Neils, H. Zhou, C. Cao, K. Campbell, C. Elliott, K. Rafferty

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

3 Citations (Scopus)
456 Downloads (Pure)


Color analysis has been essential for the interpretation of optical readouts, e.g. colorimetry, fluorescence, spectroscopy, and scanometry. However, existing colorimetric readers can hardly eliminate the color interference of colored solutions, e.g., interpreting pH test strips to assess the pH value of red wine. This paper introduces a smartphone modulated colorimetric reader that is compatible with most smartphone models and novel color subtraction algorithms that eliminate color interferences due to colored solutions. Experiments were conducted to validate the effectiveness of the developed reader and algorithms on evaluating pH test strips produced from transparent and colored solutions using multiple smartphone models. Applicability of the developed reader was demonstrated through its interpretation of pH test strips measuring pH values of colored and non-transparent food samples including red wine and milk.
Original languageEnglish
Title of host publicationIEEE Sensors 2019 Conference: Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)978-1-7281-1634-1
Publication statusPublished - 13 Jan 2020
Event18th IEEE Sensors, SENSORS 2019 - Montreal, Canada
Duration: 27 Oct 201930 Oct 2019

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Conference18th IEEE Sensors, SENSORS 2019


  • smartphone
  • colorimetry
  • color subtraction
  • versatile
  • low-cost
  • portable

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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