This article can be downloaded from Vicon hompage.
It introduces the basic concepts of OLGA, the method which estimates the joint locations and relative marker locations.
In also contains little descriptions on kinematic fitting of vicon software.
See more details in attatched file.
OLGA (Optimized Lower-limb Gait Analysis) was introduced in 2003 as a
plug-in which works with the Vicon Workstation software. OLGA co-exists with
the Conventional Gait Model (, henceforth called CGM), implemented
by Vicon in the VCM and Plug-in Gait software packages, but introduces the
additional step of a procedure which optimizes the locations of joint centers
and segment orientations prior to the calculation of joint kinematics
OLGA goes hand in hand with the CGM in that it uses this model to both
come up with the initial guesses for the patient’s skeletal anatomy and to
calculate the kinematic and kinetic results.
This paper aims to explain the concepts, methods and processes used
by OLGA in “plain English”. The complexity of the technique is often both
a confusing factor and a discouragement to potential testers/users. The
challenge is that the advanced mathematical techniques used by OLGA
cannot always be explained in simple language – a certain amount of
background knowledge about motion capture in general and biomechanical
modeling in particular must therefore be assumed.