Abstract: An upper extremity wearable device includes a pressure sleeve configure to wrap a forearm, a middle finger stimulating electrode and a ring finger stimulating electrode disposed on an inner surface of the pressure sleeve. The middle finger stimulating electrode covers a middle finger stimulating point which is measured from an ulnar styloid process, moving two lateral units, and moving four longitudinal units. The ring finger stimulating electrode covers a ring finger stimulating point which is measured from the ulnar styloid process, moving one lateral unit, and moving five longitudinal units. The lateral unit is a distance from the position of the pressure sleeve corresponding to the ulnar styloid process to a radial styloid process dividing four. The longitudinal unit is a distance from the position of the pressure sleeve corresponding to the ulnar styloid process to an olecranon process dividing twelve.

Abstract: A tracking system includes a trackable device and a tracking device. The trackable device has a three-dimensional shape. The trackable device includes a first orientation sensor for sensing a first orientation of the trackable device. The tracking device is communicated with the trackable device. The tracking device includes a second orientation sensor, an image sensor and a processing circuit. The second orientation sensor is configured to sense a second orientation of the tracking device. The image sensor configured to capture an image. The processing circuit is coupled with the second orientation sensor and the image sensor. The processing circuit is operable to calculate a two-dimensional silhouette corresponding to the three-dimensional shape according to the first orientation and the second orientation, and utilize the two-dimensional silhouette to search the image captured by the image sensor for allocating coordinates of the trackable device within the image.

Abstract: A tracking system includes a trackable device and a tracking device. The trackable device has a three-dimensional shape. The trackable device includes a first orientation sensor for sensing a first orientation of the trackable device. The tracking device is communicated with the trackable device. The tracking device includes a second orientation sensor, an image sensor and a processing circuit. The second orientation sensor is configured to sense a second orientation of the trackable device. The image sensor configured to capture an image. The processing circuit is coupled with the second orientation sensor and the image sensor. The processing circuit is operable to calculate a two-dimensional silhouette corresponding to the three-dimensional shape according to the first orientation and the second orientation, and utilize the two-dimensional silhouette to search the image captured by the image sensor for allocating coordinates of the trackable device within the image.