Graph of changes in the iris length a) and the graph of changes in the value of Δ
b) for the sorted (from the smallest value) images. The area marked in blue in the graph a) covers the properly set iris contours but due to their length (<16 pixels, 500 μm) they cannot be used for further analysis. The acceptable values of the iris length are highlighted in green and the incorrectly designated iris contours in yellow. On the graph b), properly set values of the difference Δ
are marked in green and the algorithm errors are in yellow.