Optical Motion Capture & Kinematic Analysis

Key Engineering Contributions

1. 01
   Kinematic Modeling: Computed virtual joint centers (e.g., pelvis and hip joint centers) from raw 3D spatial marker coordinates to establish anatomical reference frames.
2. 02
   Coordinate Transformation: Derived and applied analytical rotation matrices to continuously map the relative orientation between the pelvis and thigh coordinate systems.
3. 03
   Euler Angle Decomposition: Programmed custom MATLAB algorithms to mathematically decompose the rotation matrices into clinically relevant Euler angles (flexion/extension, adduction/abduction, internal/external rotation).
4. 04
   Gait Cycle Analysis: Segmented and normalized the continuous time-series kinematic data to represent 0-100% of the human gait cycle, producing standardized biomechanical performance plots.

Visual Documentation

Figure 1

01.png

Plot of relative adduction/abduction, flexion/extension, and rotation angles during a two-minute walking dataset

Figure 2

02.png

Normalized flexion/extension angles across full human gait cycle

Figure 3

03.png

Normalized adduction/abduction angles across full human gait cycle

Figure 4

04.png

Normalized rotation angles across full human gait cycle