Gesture detection using external sensors

A method, comprising:

• receiving, by one or more processors, image data from one or more sensors capturing a motion of a user, the image data including a series of frames associated with a first coordinate system, each frame having a respective timestamp;
• receiving, by the one or more processors, sensor information from a wearable computing device worn by the user, the sensor information including measured motion data associated with a second coordinate system, each measurement of the motion data being having a respective timestamp associated with the wearable computing device;
• determining, by the one or more processors, one or more correlations between the image data and the motion data based on the respective timestamps of each frame of the series of frames and the respective timestamps of the motion data measurements, wherein one or more of the measurements of the motion data are used to determine movement of the user between at least a sequential pair of the series of frames;
• detecting, by the one or more processors, a gesture by the user based on the one or more correlations between the image data and the motion data, in accordance with the movement between the sequential pair of frames;
• determining, by the one or more processors, that the gesture corresponds to a user command;
• and
• controlling, by the one or more processors, a computing device in response to the user command.