Illumination-Invariant Active Vision
Journal of Machine Vision and Applications(1992)
摘要
We have developed a visual system which adapts for varying illumination. The system has three features. First, the intenaity of the image is kept constant by au- tomatically adjusting the iris value which is a camera parameter. Semnd, t.lw gray levels of itn image portion or the user's interest are averaged on the assumptiorl illat localized illumination changes uniformly, and the difference between the obtained gray level average and a pred~t~rnlined reference value is calculated as an illumi- nation variable. Third, the iris value, which zeroes the illu~nination variable, is estimated linearly I>ecause the r~lationship betwccn the iris value and the gray level av- eragr can be locally approximated by a linear function. TJIP system was evaluatt:d with it11 edhe dt.tectioir, wliile changing the illumination in a variety of ways. The sys- trm proved capable of detecting edges more stably and r~lial,ly than wh~n the systcm was not used.
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关键词
active vision,visual system
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