1. A method for performance by a computer, for automatically processing an image including the junction between a cornea and an iris, the method comprising: defining a region of interest (ROI) in the image; deriving an estimated position of said junction within the region of interest; defining a second region of the image based on the estimated position of the junction; extracting features of the second region of the image; and inputting the extracted features to an adaptive model, the adaptive model outputting at least one variable characterizing the junction.