Robust Myocardial Motion Tracking for Echocardiography: Variational Framework Integrating Local-to-Global Deformation

The estimation of endocardial border by the Lucas-Kanade optical flow method. Case  2: the tracked points are irregularly spaced by indistinguishable speckle patterns; (a) initially traced endocardial border and its tracking points at an ED frame, (b) the tracked result at the ES frame, (c) at the frame between ES and ED, and (d) at the next ED frame.