Comparison of single-spot technique and RGB imaging for erythema index estimation

I. Saknite, A. Zavorins, D. Jakovels, J. Spigulis, J. Kisis

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A commercially available point measurement device, the Mexameter®, and an experimental RGB imaging prototype device were used for erythema index estimation of 50 rosacea patients by analysing the level of skin redness on the forehead, both cheeks and both sides of a nose. Results are compared with Clinician's Erythema Assessment (CEA) values given by two dermatologists. The Mexameter uses 568 nm and 660 nm LEDs and a photodetector for estimation of erythema index, while the used prototype device acquired RGB images at 460 nm, 530 nm and 665 nm LED illumination. Several erythema index estimation algorithms were compared to determine which one gives the best contrast between increased erythema and normal skin. The erythema index estimations and CEA values correlated much better for the RGB imaging data than for those obtained by the conventional Mexameter technique that is widely used by dermatologists and in clinical trials. In result, we propose an erythema index estimation approach that represents increased erythema with higher accuracy than other available methods.

Original languageEnglish
Article number333
Pages (from-to)333-346
Number of pages14
JournalPhysiological Measurement
Issue number3
Publication statusPublished - 4 Feb 2016


  • Clinician's Erythema Assessment
  • erythema index
  • haemoglobin
  • melanin
  • RGB imaging
  • rosacea
  • skin

Field of Science*

  • 2.6 Medical engineering
  • 3.1 Basic medicine

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database


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