Figure 4
From: Marker-Based Human Motion Capture in Multiview Sequences
Angular constraints enforcement by propagating particles within the allowed angular ranges 
. In (a), samples are propagated following a truncated Gaussian distribution 
centered at 
with covariance matrix 
bounded between 
and 
(green zone). (b) An example of particle propagation in the knee angle displaying how propagated particles never fall out the legal ranges (
).