A Fast and Robust Method for Pupil Center Estimation Using Chi-square Significance Test of Measurement Residual

In this paper a low cost pupil center locating system was introduced and a robust pupil center estimation method was presented. Differing from other methods, eye image was converted into the space of chi-square significance of measurement residual (CSMR) first in the proposed method. In CSMR space, pupil area was enhanced while others were depressed. And then, a threshold selected by the statistical method was used to binarize the image in CSMR space. Finally pupil center was obtained by calculating mass center of the binarized image. Experiments showed that the proposed method was effective, even if in sunlight environment, pupil was small and images of eye were noisy.