An example of individualization of the model and the sensitivity to the parameter changes. (a) Input eye region image. (b) Individualized eye model s = {du, f, db, dr, ri, Ir7} = {0.5, 0.7, 0.71, 0.7, 0.5, 0.7}. (c) Sensitivity to parameter du. (d) Sensitivity to parameter f. (e) Sensitivity to parameter db. (f) Sensitivity to parameter dr. (g) Sensitivity to parameter ri. (h) Sensitivity to parameter Ir7.