Fig. 2From: Camera-based photoplethysmography in an intraoperative settingExample for a segmentation process using level set methods. a Initialization point. b Point during segmentation. c Point when process has converged. The inside region \(\Omega _1\) and the outside region \(\Omega _2\) are implicitly described and changed by \(\Phi.\) The contour \(\Phi =0\) is depicted separately in the images below the graphs. Please note that t represents the segmentation time for an image and does not refer to the time component in the videos. The eye section was blurred if it was visibleBack to article page