There has been considerable interest in immersive and realistic virtual environment system and how to improve human
and computer interaction has been a main challenge. For vision-based human-computer interaction, extraction of user
region from camera images is an essential part. In this paper, we propose a background subtraction method that segments
dynamic projected background in a rear-projection-based virtual environment system. In the projector-camera system,
the projected background is inherently known by the projector input images although its appearance is changed by the
geometric and radiometric transformation between projector and camera. Therefore, we can compute the expected
background location and appearance based on geometric and radiometric calibration of projector-camera system and thus
separate user region from dynamic projected background by simple subtraction between camera images and the
computed background. Experimental results are given for verifying the usefulness of the proposed method.
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