Feasibility of LED-assisted CMOS Camera: Contrast estimation for laser tattoo treatment

Ngot Thi Pham, Woosub Song, Hyejin Kim, Jae Hyun Jung, Suhyun Park, Hyun Wook Kang

Research output: Contribution to journalArticlepeer-review


Understanding the residual tattoo ink in skin after laser treatment is often critical for achieving good clinical outcomes. The current study aims to investigate the feasibility of a light-emitting diode (LED)-assisted CMOS camera to estimate the relative variations in tattoo contrast after the laser treatment. Asian mice were tattooed using two color inks (black and red). The LED illumination was a separate process from the laser tattoo treatment. Images of the ink tattoos in skin were acquired under the irradiation of three different LED colors (red, green, and blue) for pre- and post-treatment. The degree of contrast variation due to the treatment was calculated and compared with the residual tattoo distribution in the skin. The black tattoo demonstrated that the contrast consistently decreased after the laser treatment for all LED colors. However, the red tattoo showed that the red LED yielded an insignificant contrast whereas the green and blue LEDs induced a 30% (p < 0.001) and 26% (p < 0.01) contrast reduction between the treatment conditions, respectively. The proposed LED-assisted CMOS camera can estimate the relative variations in the image contrast before and after the laser tattoo treatment.

Original languageEnglish
Article number661
JournalApplied Sciences (Switzerland)
Issue number5
StatePublished - 25 Apr 2018

Bibliographical note

Funding Information:
Acknowledgments: This work was supported by the Technology Development Program (S2463632) funded by the Ministry of SMEs and Startups (MSS, Korea).

Publisher Copyright:
© 2018 by the authors.


  • CMOS
  • Contrast variation
  • LED
  • Tattoo treatment


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