A LEVEL-SET APPROACH FOR TRACKING OBJECTS IN IMAGE SEQUENCES USING A LEVEL CONSERVATION CONSTRAINT: APPLICATION TO CARDIAC SEQUENCES

摘要

Tracking of moving objects in an image sequence is an important task in many application (e.g. medical imaging, robotics).However, this task is usually difficult due to inherent problems that could happen in sequences (i.e. possible occlusionof the object, large interframe motion). In this paper, we describe a new approach to integrate a priori motion information into a level-set-based active contour approach. Specifically, we introduce a new constraint that enforces the conservation of the levels of the implicit function along the image sequence. This constraint is formulated as a motion prior energyand is used in a tracking algorithm. The method is validatedquantitatively on a clinical application based on 10 echocardiographic and 5 cine-MRI sequences ( 700 images).