atermark is added within data of video, to avoid conceal
the watermark in fixed location of the frames of video, this paper indicates an approach for selecting
an active object that characterizes with motion activity this means its corresponding trajectory has
complex shape in distribution of x and y coordinates without gradual and sequential of points
distribution, whereas this object s trajectory has unexpected distribution of points for its motion and
position changing throughout frames of an input video. The approach of this paper depends on the
concept of metric space with allocation of epsilon parameter which implements the maximum distance
that can aid to determine the way or shape of distribution a trajectory s point, and specify which a
trajectory with the complex shape and there are more curvatures in it in order to conceal the
watermark in an object that corresponds to a trajectory that is selected by the approach that was
indicated in details in this paper.
Keywords: Information Hiding, Video Object Trajectory, Video Watermarking.