Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Shooting Distance Adaptive Pore Extraction for Skin Condition Estimation

피부 상태 추정을 위한 촬영 거리에 적응적인 모공 검출 연구

  • Lee, Kang-Kyu (School of Electrical Engineering, Korea University) ;
  • Yoo, Jun-Sang (School of Electrical Engineering, Korea University) ;
  • Bae, Jin-Gon (School of Electrical Engineering, Korea University) ;
  • Bae, Ji-Sang (School of Electrical Engineering, Korea University) ;
  • Kim, Jong-Ok (School of Electrical Engineering, Korea University)
  • 이강규 (고려대학교 전기전자공학부) ;
  • 유준상 (고려대학교 전기전자공학부) ;
  • 배진곤 (고려대학교 전기전자공학부) ;
  • 배지상 (고려대학교 전기전자공학부) ;
  • 김종옥 (고려대학교 전기전자공학부)
  • Received : 2015.05.06
  • Accepted : 2015.07.30
  • Published : 2015.08.25
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Abstract

Nowadays, cameras embedded in smartphones can take high resolution photographs that can be used to analyze skin conditions without using specialized equipments. In shooting photographs with a smartphone, it is difficult to maintain a uniform shooting distance. Therefore, it is essential to adapt a skin analysis method to the shooting distance. In this paper, we focus on a pore detection algorithm that is adaptive to the camera distance. We develop a relationship model between the shooting distance and the appropriate size of the pore detection mask. In addition, we propose a method to estimate the normalized pore size (i. e. pore size at a standard shooting distance). We conducted experiments on skin images taken from different shooting distances. It was verified that the proposed method can achieve more accurate pore detection result, close to those from skin images taken at a standard shooting distance.

최근 스마트 폰 카메라가 발달함에 따라, 전문적인 촬영장비 없이 일반 스마트 폰 카메라만으로 피부 상태를 추정할 수 있을 정도의 고해상도 영상 획득이 가능해졌다. 스마트 폰을 활용한 영상 촬영은 일정한 거리에서 이루어지기가 힘들기 때문에 촬영거리에 적응적인 피부 특성 측정 방법이 필수적이다. 본 논문에서는, 여러 피부 특성 중 거리에 따라 크기가 변하는 모공검출에 집중하였다. 실험을 통해 촬영 거리와 피부 특성 검출에 적절한 마스크 크기 사이의 관계를 모델링했고, 모공크기 보상기법을 설계하였다. 서로 다른 거리에서 촬영한 영상에서 실험한 결과, 기준 거리에서의 결과와 유사한 모공 검출 결과를 얻을 수 있음을 확인하였다.

Keywords

References

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