Joint motion estimation and layer segmentation in transparent image sequences - Application to transparent-motion-compensated noise reduction in X-ray image sequences

Vincent Auvray 1 Patrick Bouthemy 2 Jean Liénard 3
2 VISTA - Vision spatio-temporelle et active
IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires, Inria Rennes – Bretagne Atlantique
Abstract : This paper is concerned with the estimation of the motions and the segmentation of the spatial supports of the different layers involved in transparent X-ray image sequences. Classical motion estimation methods fail on sequences involving transparent effects since they do not explicitly model this phenomenon. We propose a method that comprises three main steps: initial block-matching for two-layer transparent motion estimation, motion clustering with 3D Hough transform, and joint transparent layer segmentation and parametric motion estimation. It is validated on synthetic and real clinical X-ray image sequences. Secondly, we derive an original transparent motion compensation method compatible with any spatio-time filtering technique. A direct transparent motion compensation method is proposed. To overcome its limitations, a novel hybrid filter is introduced which locally selects which type of motion compensation is to be carried out for optimal denoising. Convincing experiments on synthetic and real clinical images are also reported.
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Vincent Auvray, Patrick Bouthemy, Jean Liénard. Joint motion estimation and layer segmentation in transparent image sequences - Application to transparent-motion-compensated noise reduction in X-ray image sequences. [Research Report] RR-6762, INRIA. 2008, pp.41. 〈inria-00348012〉

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