Marker-based optical position measurement is investigated in this paper. If the exposure
time is not very short, it might cause the blur of the marker on the image if fast
movement needs to be recorded. This paper investigates the effect of blur on the center
point estimate and provides a measure for the distortion to help adjust camera parameters
(exposure time, aperture, and ISO sensitivity) in the case of poor lighting conditions.
The distortion of the center point estimate is derived as a function of movement of
the marker. It is shown that the distortion can be well modeled as integral mean of
the marker center. Its distortion can be calculated, and either kept on a limited
level by appropriate setting of camera parameters (measure of error is derived) or
numerically compensated (inverse filtered). Simulation and measurement examples show
the usefulness of the correction.
