Title :
Research on feature points positioning in non-contact eye-gaze tracking system
Author :
Yan, Bei ; Gao, Lifeng ; Zhang, Xigong
Author_Institution :
Sch. of Autom. Sci. & Electr. Eng., Beihang Univ., Beijing, China
Abstract :
The accuracy and the real time ability of positioning the feature points, including the four reference glints and the center of the eye pupil, are essential to the eye-gaze tracking system based on the cross-ratio. In the paper, in order to handle the two issues in the images to be processed, that is, the similar gray values and the low resolution, an algorithm of feature points positioning with strong adaptability is proposed, namely, using the improved Otsu method for detecting the glints, and adopting a method combining emitting rays with ellipse fitting for positioning the center of the pupil. Some experiments are performed on the non-contact eye-gaze tracking system on a VC ++ 6.0 platform, and the results show that: when the eye is located 70cm in front of the screen (33cm times 26cm), 30 times 25 points can be distinguished, and the processing requires only 16ms on average.
Keywords :
curve fitting; feature extraction; tracking; Otsu method; VC ++ 6.0 platform; cross-ratio method; distance 70 cm; ellipse fitting method; emitting rays; eye pupil center positioning; eye-gaze tracking system; feature points positioning; noncontact tracking system; reference glints detection; size 26 cm; size 33 cm; time 16 ms; Cameras; Face detection; Image edge detection; Image resolution; Infrared imaging; Light emitting diodes; Monitoring; Motion detection; Object detection; Pixel; ellipse fitting; eye-gaze tracking; feature points positioning; the Otsu method;
Conference_Titel :
Electronic Measurement & Instruments, 2009. ICEMI '09. 9th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-3863-1
Electronic_ISBN :
978-1-4244-3864-8
DOI :
10.1109/ICEMI.2009.5274115
