Abstract: An apparatus may include: a housing configured to be worn on at least a portion of a human hand or wrist; an inertial measurement unit (IMU) attached to the housing and configured to generate IMU data corresponding to an orientation of the apparatus; a wireless transmitter attached to the housing and configured to transmit radio frequency (RF) signals corresponding to the IMU data; an ultrasonic transmitter system attached to the housing and comprising one or more ultrasonic transmitters; and a control system attached to the housing and configured to: control a first ultrasonic transmitter of the ultrasonic transmitter system to produce first ultrasonic transmissions of a first ultrasonic transmission type; and control the wireless transmitter to transmit RF signals corresponding to the IMU data, the RF signals being synchronized with the first ultrasonic transmissions. The apparatus may be a ring that is configured to be worn on a human digit.

Abstract: The embodiments are directed to generating synthetic data. For example, in some examples, a method for creating 2D images of an object with annotation points is carried out by a processing unit. The method includes considering a synthetic 3D model of the object, named synthetic object, with annotation points correctly placed on the synthetic object. The method also includes generating several synthetic objects with different poses and different brightness conditions. Further, the method includes considering several 2D images with different backgrounds and different brightness conditions. For each 2D image, the method includes insertion of a generated synthetic object in the 2D image.

Abstract: A method for creating 2D images of an object with annotation points, the method being carried out by a processing unit and including: considering a synthetic 3D model of the object, named synthetic object, with annotation points correctly placed on the synthetic object; generating several synthetic objects with different poses and different brightness conditions; considering several 2D images with different backgrounds and different brightness conditions; and for each 2D image, insertion of a generated synthetic object in the 2D image.