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. Author manuscript; available in PMC: 2018 Oct 1.
Published in final edited form as: J Magn Reson Imaging. 2017 Feb 15;46(4):1060–1072. doi: 10.1002/jmri.25659

Figure 2. Displacement Flow Fields Computation.

Figure 2

Longitudinal (x) and transversal (y) displacement flow fields between pairwise sequential frames are computed using an optical flow (OF) formulation robust to large displacement (LDOF). This approach couples discrete feature point tracking computed from histograms of oriented gradients (HOG) with a continuous variational optical flow step. The discrete HOG matches (red vectors) are displayed and superimposed on the first cardiac MR image of the pair. The resulting dense pixel-wise x and y displacement flow fields are shown at bottom.