Background Model-based 3D pose estimation has been widely used in many 3D human motion analysis applications. in which vision-based and inertial-based are two distinct lines. Multi-view images in a vision-based markerless capture system provide essential data for motion analysis. but erroneous estimates still occur due to ambiguities. https://www.roneverhart.com/Echo-Fix-EF-P2-Spring-Reverb-Pedal-p32083/