Background subtraction based on logarithmic intensities

Authors:
Quen-Zong Wu;Bor-Shenn Jeng
Affiliations:
Chunghwa Telecommunication Laboratories, 12, Lane 551, Min-Tsu Road Sec. 5, Yang-Mei, Taoyuan, Taiwan, ROC;Chunghwa Telecommunication Laboratories, 12, Lane 551, Min-Tsu Road Sec. 5, Yang-Mei, Taoyuan, Taiwan, ROC
Venue:
Pattern Recognition Letters
Year:
2002

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Abstract

Background subtraction is widely used as the basis for moving object extraction from image sequences. For traditional background subtraction, the standard intensities in interested images are compared to those in the reference image. As standard intensity can be expressed as the multiplication of illumination and reflectance, the logarithmic intensity is therefore the addition of logarithmic illumination and logarithmic reflectance, which are easier to be separated and analyzed than the multiplication of illumination and reflectance. In this paper, background subtraction based on logarithmic intensities is proposed. Experimental results show that background subtraction based on logarithmic intensities is superior to traditional background subtraction in producing difference images with better quality. In addition, the threshold selection is less critical with the proposed background subtraction scheme.