IMAGE PROCESSING DEVICE AND IMAGE PROCESSING METHOD

An image processing device includes a memory unit, a candidate pupil detecting unit and a pupil determining unit. The memory unit is used in storing information regarding a pupil size. The candidate pupil detecting unit detects noncircular candidate pupils from an image in which an eye area is captured. The pupil determining unit extrapolates the shapes of the candidate pupils that are detected by the candidate pupil detecting unit and, based on the pupil size stored in the memory unit, determines a pupil from among the candidate pupils.