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Robust Threshold Determination on Various Lighting for Marker-based Indoor Navigation

마커 방식 실내 내비게이션을 위한 조명 변화에 강한 임계값 결정 방법

  • 최태웅 (동신대학교 디지털콘텐츠학과) ;
  • 이현철 (동신대학교 디지털콘텐츠학과) ;
  • 허기택 (동신대학교 디지털콘텐츠학과) ;
  • 김은석 (동신대학교 디지털콘텐츠학과)
  • Received : 2011.10.10
  • Accepted : 2011.11.10
  • Published : 2012.01.28

Abstract

In this paper, a method of determining the optimal threshold in image binarization for the marker recognition is suggested to resolve the problem that the performances of marker recognition are quite different according to the changes of indoor lighting. The suggested method determines the optimal threshold by considering the average brightness, the standard deviation and the maximum deviation of video image under the various indoor lighting circumstances, such as bright light, dim light, and shadow by unspecified obstacles. In particular, the recognition under the gradation lighting by shadow is improved by applying the weighted value that depends on the brightness of image. The suggested method is experimented to process $720{\times}480$ resolution video images under the various lighting environments, and it shows the fast and high performance, which is suitable for mobile indoor navigation.

Keywords

Binarization;Image Processing;Marker Technique;Lighting;Threshold

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