2. RELATED WORK
A first major step is the separation of the foreground from the background in videos. Many approaches have been
presented to separate and segment foreground objects in videos, including the promising optical flow techniques11–15
and statistical approaches.16 The general idea is to identify foreground and background (camera) motion. A camera
model that uses six or eight parameters is sufficient to describe most camera motions.17–19 To estimate the modell’s
parameters feature-based20 or gradient-based algorithms21 can be used.