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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Comput Methods Programs Biomed. 2010 Apr 30;102(2):219–226. doi: 10.1016/j.cmpb.2010.03.008

Figure 2.

Figure 2

Systematic ROI selection. Let M represents the ROI and pt(i, j) the pixel intensity at position (i, j) of a frame taken at t heart beats. Initially, all pixels are considered in the ROI, i.e. M(i, j) = 1 for all pixels. [1] Set M(i, j) = 0 if there exists a frame taken at PI ≤2 hb which intensity at (i, j) exceeds K1. [2] Set M(i, j) = 0 if among all frames, the intensity at (i, j) exceeds K2 at least once. The resulting M is the ROI.