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A Study on the Image-Based Luminance Measurement System Using the Measuring Position

측정 위치를 고려한 영상기반 휘도측정시스템에 관한 연구

  • Sun, Eun-Hey (Dept. of Electrical, Electronic and Control Engineering, Hankyong National University) ;
  • Kim, Yong-Tae (Dept. of Electrical, Electronic and Control Engineering, Hankyong National University)
  • 선은혜 (한경대학교 전기전자제어공학과) ;
  • 김용태 (한경대학교 전기전자제어공학과)
  • Received : 2014.05.28
  • Accepted : 2014.08.11
  • Published : 2014.08.25

Abstract

In this paper, an image-based luminance measurement system(LMS) is proposed to measure the luminance of outdoor signboards. We design the LMS that can improve disadvantages of efficiency of the point-luminance meter and portability of face-luminance meter using the image of DSLR camera and print out the luminance value by using the proposed luminance analysis algorithm in real time. Outdoor signboards have various size and shape, and are also installed on the various place. Luminance of the signboard is influenced by measurement location, angle, color, etc. Therefore, we measure the change of luminance value in accordance with measurement location for accurate luminance measurement and then consider the luminance value according to the measurement distance. We obtain a numerical relation between luminance value and measurement location. The proposed LMS is verified through comparative experiment with point-luminance meter.

본 논문에서는 발광광고물의 휘도를 측정하는 영상기반 휘도측정시스템을 제안한다. 제안하는 휘도측정시스템은 DSLR 카메라의 영상을 이용하여 점휘도계의 효율성과 면휘도계의 휴대성 및 경제성의 단점을 보완하며, 대상의 전체적인 휘도를 측정하는 시스템으로 영상을 입력받아 휘도분석 알고리즘을 통해 실시간으로 휘도값이 출력되도록 설계하였다. 측정 대상인 발광광고물은 설치 위치, 크기, 모양이 다양하며, 발광광고물의 휘도는 측정 거리, 각도, 색 등 다양한 조건에 따라 측정값이 달라진다. 따라서 정확한 휘도를 측정하기 위하여 측정대상물과의 거리에 따른 휘도값의 변화를 측정하였고, 측정 거리가 증가하면 휘도값이 변화하는 것을 고찰하였다. 실험을 통하여 측정 위치와 휘도값의 연관성을 수식으로 나타내었고, 제안한 방법을 평가하기 위해 점휘도계를 이용한 측정값과 비교 실험을 진행하였다.

Keywords

References

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Cited by

  1. Luminance Correction Algorithm Based on Measuring Angle for the Portable Luminance Measurement System vol.26, pp.4, 2016, https://doi.org/10.5391/JKIIS.2016.26.4.321