Abstract: Systems, methods, and computer-readable media are disclosed for autonomous tennis assistant systems having autonomous ball machines such as an autonomous and interactive tennis ball ejection robot. Example methods include determining, by a device, the position of a first player on a tennis court, determining a first target location for a first tennis ball to be ejected toward the first player, generating a trajectory for the first tennis ball to reach the first target location, and causing ejection of the first tennis ball from the tennis ball ejection robot along the generated trajectory toward the first target location. A base station may be used to provide image data for use by the tennis ball ejection robot from one or more additional vantage points.

Abstract: A dual functional robot for collecting rollable objects capable of an upright position and a horizontal position, in which the robot includes a way to propel the robot; a way to control propulsion of the robot; a way to locate the rollable object; a way to collect the rollable object; a way to store the rollable object; a way to support the robot and allow the robot to move across a surface in a low-friction manner; and a way to stably reorient the robot from the horizontal position into the upright position.

Abstract: A dual functional robot for collecting rollable objects capable of an upright position and a horizontal position, in which the robot includes a way to propel the robot; a way to control propulsion of the robot; a way to locate the rollable object; a way to collect the rollable object; a way to store the rollable object; a way to support the robot and allow the robot to move across a surface in a low-friction manner; and a way to stably reorient the robot from the horizontal position into the upright position.

Abstract: A dual functional robot for collecting rollable objects capable of a stable upright position and a stable horizontal position, in which the robot includes a way to propelling the robot; a way to controlling propulsion of the robot connected to provide commands to the means for propelling; a way to locating the rollable object connected to provide data to the way to controlling propulsion; means for collecting the rollable object; a way to storing the rollable object positioned to accept the rollable object from the way to collecting; a way to supporting the robot and allowing the robot to move across a surface in a low-friction manner; and a way to stably reorienting the robot from the horizontal position into the upright position.

Abstract: A dual functional robot for collecting rollable objects capable of a stable upright position and a stable horizontal position, in which the robot includes a way to propelling the robot; a way to controlling propulsion of the robot connected to provide commands to the means for propelling; a way to locating the rollable object connected to provide data to the way to controlling propulsion; means for collecting the rollable object; a way to storing the rollable object positioned to accept the rollable object from the way to collecting; a way to supporting the robot and allowing the robot to move across a surface in a low-friction manner; and a way to stably reorienting the robot from the horizontal position into the upright position.