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Technical Program

Paper Detail

Paper:	IMDSP-L9.2
Session:	Video Segmentation and Tracking
Time:	Friday, May 19, 14:20 - 14:40
Presentation:	Lecture
Topic:	Image and Multidimensional Signal Processing: Video Segmentation and Tracking
Title:	A Contour Tracking Algorithm for Rotoscopy
Authors:	Vincent Garcia, Eric Debreuve, Michel Barlaud, Laboratoire I3S / CNRS / UNSA, France
Abstract:	Rotoscopy is a crucial processing for cinema post-production. It corresponds to the segmentation of an object of interest in a video in order to apply a local processing. In the industry, rotoscopy is usually performed manually, frame by frame. Semi-automatic algorithms have been proposed to reduce the load of this task. However, they classically use contour-based information and consequently lack robustness in case of occlusion. Here, we propose a region-based contour tracking algorithm relying on feature points which are temporally matched to build trajectories used to estimate a global or local deformation between a distant reference contour and the current frame. Then, we propose a rotoscopy algorithm based on a forward and a backward contour tracking. The use of region information and distant reference contours allows to avoid drift and greatly reduce the influence of occlusions. The rotoscopy algorithm was applied to CIF and SD sequences.