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Table 1 A summary of the mean error values \(\delta_{k}\) and the minimum, maximum values and standard deviations of the error \(\delta_{k}\) obtained for all the compared methods: Sobel, Roberts, Canny and the author’s (proposed) method of outer corneal edge detection in images from the Corvis® ST tonometer

From: A new method for detecting the outer corneal contour in images from an ultra-fast Scheimpflug camera

Methodδk (%)δk(min) (%)δk(max) (%)std (%)
Proposed0.160.093.620.19
Sobel3.430.2542.126.21
Roberts5.780.1761.679.19
Canny1.260.5350.703.11