A novel apparatus and method for controlling a system with multiple observable variables is disclosed. The ear clip includes a core that can plastically be deformed according to a difference between shapes of the root of auricle and a protecting material that covers the core. In some embodiments of the invention, the determination as to whether the episode has terminated is made irrespective of the rate of atrial depolarizations. A mesh-based method employs pins on the binary segmentation boundary and a mesh generated for the unknown region; the pins are tracked from one frame to the next according to an optical flow technique, the mesh is deformed from one frame to the next according to the movement of the pins, and the adaptive trimap is then warped according to the deformed mesh.