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The level set method (LSM) has been widely used for various applications such as motion tracking and 3D geometrical modeling. However, the calculation cost of reinitialization and updating of an implicit function is considerably expensive as compared with conventional active contour models such as "snakes". To tackle this problem, we propose an efficient algorithm of the LSM named the fast level set method (FLSM). This paper introduces some experiments based on the FLSM, including 2D real-time tracking of moving objects in video images, and 3D simultaneous motion capture system of multiple targets using stereo range images.