Fig. 2
From: Key transition technology of ski jumping based on inertial motion unit, kinematics and dynamics
Example data of angle parameter from the same takeoff phase calculated using both methods. Angle (in the joint coordinate system of the left lower limbs, average of eight subjects) from the video data (Simi) and the merged IMU data (Xsens). The mode of joint motion is flexion and extension. Solid line = Xsens, lineation = Simi, black = hip, red = knee, blue = ankle