Interactive modifications of video object trajectories in natural video sequences for post-production applications

This paper proposes a new approach allowing efficient and semi-automatic object-based manipulation for video editing or post-production applications, such as the modification of the trajectories of video objects in a natural scene. For that purpose, an image is seen as a superposition of video object planes (VOP) on an original image or a mosaic view of a fixed background. The method is based on the definition of a warping model and a depth calibration of areas of the background in which the video objects are moving. Experimental results show that a high level of realism can be obtained on the edited images in which the original trajectories of nonrigid video objects have been strongly modified.