Fig. 3From: A new method for detecting the outer corneal contour in images from an ultra-fast Scheimpflug cameraAn image from the Corvis® ST tonometer showing the outer corneal edge detected by means of the tested methods (Sobel—blue line, Roberts—magenta line, Canny—yellow line, proposed method—green line) together with the edge marked by the expert (red line)Back to article page