Fig. 4From: Development and testing of a new application for measuring motion at the cervical spineFlow of automatic annotation for detecting the upper and lower edges of the cervical spine. a Contour lines of the detecting region. b Coordinates of the detecting region. c Approximating a convex hull. d Selecting the vertebral edge to draw a line. e Annotating between C1 and C2. f Extraction of the contour coordinates near the selected edge. g Annotating between C1/2 and C6/7Back to article page