Joint bending estimation

An Augmented Reality (AR) system comprising:

• a frame;
• one or more strain gauges operable to measure strains of the frame;
• one or more imaging devices mounted to the frame;
• one or more processors;
• and a memory storing instructions that, when executed by the one or more processors, cause the system to perform operations comprising:
• capturing, using the one or more imaging devices, initial tracking video frame data of a real-world scene while the frame is in a relaxed position;
• measuring initial strain data using the one or more strain gauges while the frame is in the relaxed position;
• measuring stressed strain data using the one or more strain gauges while the frame is in a specified stressed configuration;
• recalibrating the one or more strain gauges based on the initial strain data, the stressed strain data, and the initial tracking video frame data;
• and generating corrected tracking data based on subsequent strain data measured using the recalibrated one or more strain gauges.

A non-transitory machine-readable storage medium, the machine-readable storage medium including instructions that when executed by a machine, cause the machine to perform operations comprising:

• capturing, using one or more imaging devices of an Augmented Reality (AR) system, initial tracking video frame data of a real-world scene while a frame of the AR system is in a relaxed position;
• measuring initial strain data using one or more strain gauges while the frame is in the relaxed position;
• measuring stressed strain data using the one or more strain gauges while the frame is in a specified stressed configuration;
• recalibrating the one or more strain gauges based on the initial strain data, the stressed strain data, and the initial tracking video frame data;
• and generating corrected tracking data based on subsequent strain data measured using the recalibrated one or more strain gauges.