Abs 重 ract In Augmented Reality ( AR ) , which is a technique to display virtual objects in the real space , the shadow of a vi 血 a 且object cannot be displayed correctly unless real light sources are co 皿 ectly estimated . In this paper, we propose a method that can estimate the directions of multi light sources by using pattem matching between the shadow of a 3D marker and shadow images in database even ifthe camera and the marker move . lt can be possible to have AR optically correct by

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... g the shadow ofthe virtual oblect based on the infbrmation ofthe position and the posture ofthe marker and the resu 畳 ts estimated fbr the light source directions 、