OpenCap: Human movement dynamics from smartphone videos
Fig 1
Marker-based motion capture (Mocap) versus video-based (OpenCap) analysis of human movement dynamics.
(Top row) Marker-based movement analysis usually occurs in a motion capture laboratory, and a comprehensive study of musculoskeletal dynamics typically requires more than two days of an expert’s time and equipment worth more than $150,000. (Bottom row) OpenCap enables the study of musculoskeletal dynamics in less than 10 minutes of hands-on time and with equipment worth less than $700 (assuming users need to purchase new mobile devices). OpenCap can be used anywhere with internet access and requires a minimum of two iOS devices (e.g., iPhones or iPads). (Right panel) OpenCap enables the estimation of kinematic, dynamic, and musculotendon parameters, many of which were previously only accessible using marker-based motion capture and force plate analysis.