A fast moving object segment algorithm on moving video sequences is proposed. Firstly

the difference image is produced between two continuous frames which are filtered in advance by Gauss template. Then the author proposed "assimilation" filling technique and a template modification method employing dominant motion vector are applied to remove the uncovered background and get the final object template. The "assimilation" filling technique only fills the abruptly changed gap on the edge or the inner hole

while leaves the smoothing changed edge untouched. What need to do in the filling process is just to increase or decrease the coordinate

not involving multiplication and division operation

so it is very fast. A memory buffer of objects is maintained through the whole process to remedy the disfigurement of regions gotten from a single frame. The algorithm doesn't rely on a fixed background

and can remove uncovered background to get the accurate size of objects. The algorithm only uses two continuous frames to segment the moving object from background

not like the symmetrical difference based methods which make use of three frames. It is a simple

but fast and robust algorithm.