Pupil location method based on region projection

Accurate pupil center location plays an important role in eye tracking systems. This paper proposes a method for precise pupil location based on region projection. It is used to detect a center of pupil for extraction of point of eyeball in the face image. The proposed method has four stages. Firstly, the face image is detected and extracted. Secondly, minimizing location range is carried out in the already positioned face image so that the eye location is implemented in the future. Then, the region of the detection is narrowed down by applying the region projection. In the final stage, the precise center point of pupil is detected using the gravity method. Experimental results obtained by applying the proposed method on the human face image, demonstrate that the presented method has improved both the accuracy and speed of pupil location.