Shot is the basic physical unit of video, which is
composed of a sequence of frames captured by the
same camera. There are two kinds of transform
between shots: cut transition and gradual transition, the
cut transition means that a shot directly transform from
another shot without any edit, while the gradual
transition means that a shot slowly changes to another
shot by some edit measure, such as fade in, fade out
and pile up etc [2, 3]. So there are shot transformation
in lane surveillance system where the camera is fixed.
In this paper, we define the segment that a vehicle
passes through the scene in the video as a shot. This
video shot represents the most minimal meaningful
integrated video segment. On the contrary, we define
all the video sequence with no vehicles as the
background shot.