Patent Document ID: 20040101170
Application ID: 10717804
Patent Status: 0

Claim One:
1. A method for selecting an eye image from a set of digital images based on its definition, consisting, for each image in the set, of: calculating ( 4 ) a first approximate characteristic definition score (AF) based on a cumulating of the gradients in a single direction of the light intensities of the image pixels; selecting a subset of images for which said first score is greater than a predetermined threshold; and for each of the images of said subset, calculating a second score characteristic of the image definition by an evaluation method comprising the successive steps of: approximately localizing ( 5 ) the pupil in the image; defining ( 56 ), from the approximate position of the pupil, an examination window (EI) centered on this position; and applying ( 6 ) a gradient accumulation operation to the luminance values of the pixels of the examination window, the running total being proportional to the definition score of the image.