Fig. 2
From: A new method for detecting the outer corneal contour in images from an ultra-fast Scheimpflug camera
Examples of problems with corneal edge detection described by other authors [13, 43]. a An image showing the result of outer corneal edge detection (green line) in the image from the Corvis® ST tonometer using the method presented in [13]. b A corneal image before deformation, from the Corvis® ST tonometer, along with the detected outer corneal curvature (upper edge of the green area) based on the algorithm presented in paper [43]