The present invention relates to a calculation method for calculating the pupil shape exactly the shape of the pupil in an eye image photographed as, and more specifically, the pupil at the time of recording in some cases covered by this detected pupil shape by using only the part that is not covered by the skin that can accurately calculate the shape of the pupil is calculated by modeling the shape of the pupil, such as how to skin nunkkapul . ; pupil shape modeling method according to the invention for detecting a first pixel included in the outline of the pupil is exposed on the eye image by using the brightness information corresponding to each pixel of the captured eye image step, the eye sensing a second pixel corresponding to the edge from the image, the pixel if the first pixel and the second pixel matching, determining from the outline of the pupil to the pixels on the circle outline of the pupil phase, and the circle on the basis of the pixel on the outline, and a step of modeling the shape of the pupil, the circle outline of the pupil is characterized in that the outline of the pupil when the pupil of the whole exposure.
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