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Figure 5 | BioMedical Engineering OnLine

Figure 5

From: Semi-automatic algorithm for construction of the left ventricular area variation curve over a complete cardiac cycle

Figure 5

Contour correction algorithm. The largest central watershed region is used to mask the left ventricular wall and cavity. A threshold operation is used to separate myocardial muscle from blood pool, and morphological operations are used to produce a smoother mask. This is subtracted from the watershed mask, resulting in an estimate of the ventricular cavity, which is smoothed using additional morphological operations. Note: ρ is the perimeter of the contour (in number of pixels), and denotes a contour integral. Thus, represents the mean pixel intensity along the contour.

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