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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 36 — Dec. 20, 2013
  • pp: 8779–8788

Optimized flash light-emitting diode spectra for mobile phone cameras

Felix Kimme, Peter Brick, Sangam Chatterjee, and Tran Quoc Khanh  »View Author Affiliations


Applied Optics, Vol. 52, Issue 36, pp. 8779-8788 (2013)
http://dx.doi.org/10.1364/AO.52.008779


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Abstract

Flash light-emitting diodes (LEDs) of modern mobile phones lack red and cyan spectral parts, however, the color gamut of their respective displays has increased in recent years. The influence of this discrepancy on the color reproduction of smart phones is investigated in this paper. Based on the CIECAM02 color appearance model, a metric is introduced to judge color reproduction of mobile phones under flash LED illumination. An evaluation method is established to compare the visual appearance of a scene under various surrounding illuminations with the reproduction of that scene. To facilitate a comparison with measurements, the evaluation method is based on the raw data of two test cameras and a Digital ColorChecker SG. To reduce the color shift between perception and reproduction, optimized flash LED spectra are presented. A single-LED and a double-LED concept with adjustable color temperature are derived from these results. Additionally, the common characteristics of flash LED spectra giving good results is investigated, identifying the spectral parts with the most influence on camera color reproduction and showing the spectral parts not contributing or even resulting in poor color reproduction. Finally the efficiency of optimized flash LED spectra is compared to standard flash LEDs.

© 2013 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(120.5240) Instrumentation, measurement, and metrology : Photometry
(150.2950) Machine vision : Illumination
(330.1710) Vision, color, and visual optics : Color, measurement
(330.6180) Vision, color, and visual optics : Spectral discrimination

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: September 20, 2013
Revised Manuscript: November 13, 2013
Manuscript Accepted: November 20, 2013
Published: December 16, 2013

Virtual Issues
Vol. 9, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Felix Kimme, Peter Brick, Sangam Chatterjee, and Tran Quoc Khanh, "Optimized flash light-emitting diode spectra for mobile phone cameras," Appl. Opt. 52, 8779-8788 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-36-8779

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