TY - JOUR
T1 - A new method for eye location tracking
AU - Paperno, Eugene
AU - Semyonov, Dmitry
N1 - Funding Information:
Manuscript received August 28, 2002; revised March 18, 2003. This work was supported in part by the Ivanier Center for Robotics Research Ivanier Center for Robotics Research and Production Management. Asterisk indicates corresponding author. *E. Paperno is with the Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel (e-mail: [email protected]).
PY - 2003/10/1
Y1 - 2003/10/1
N2 - A standard scleral search coil (SSC) system is supplied with a single three-axial transmitter (or with a triad of transmitters) and the direct magnetic coupling between the transmitting coils and the SSC is used for computing the eye location. The SSC's orientation components measured by the SSC system are involved in the location-tracking algorithm as well. The suggested method differs from traditional ones where the eye location is computed indirectly, relative to the measured location and orientation of a transitional three-axial magnetic sensor attached to the subject's head. The new method eliminates systematic errors caused by inaccurate situating the transitional sensor relative to the eye. It also eliminates systematic errors caused by imperfect orthogonality of the transitional sensor. It is found that an accurate location tracking with a single transmitter is possible only if orientation freedom of the eye is limited. To track the eye location with no orientation limitations, a triad of transmitters is employed. The resulting accuracy can be as good as ±1 mm (in a 200-Hz bandwidth) over a relatively large (0.5 × 0.5 × 0.5 m) operating region in the center of a 1 × 1 × 1 m SSC system. The analytical results obtained are confirmed with the help of computer simulations.
AB - A standard scleral search coil (SSC) system is supplied with a single three-axial transmitter (or with a triad of transmitters) and the direct magnetic coupling between the transmitting coils and the SSC is used for computing the eye location. The SSC's orientation components measured by the SSC system are involved in the location-tracking algorithm as well. The suggested method differs from traditional ones where the eye location is computed indirectly, relative to the measured location and orientation of a transitional three-axial magnetic sensor attached to the subject's head. The new method eliminates systematic errors caused by inaccurate situating the transitional sensor relative to the eye. It also eliminates systematic errors caused by imperfect orthogonality of the transitional sensor. It is found that an accurate location tracking with a single transmitter is possible only if orientation freedom of the eye is limited. To track the eye location with no orientation limitations, a triad of transmitters is employed. The resulting accuracy can be as good as ±1 mm (in a 200-Hz bandwidth) over a relatively large (0.5 × 0.5 × 0.5 m) operating region in the center of a 1 × 1 × 1 m SSC system. The analytical results obtained are confirmed with the help of computer simulations.
KW - Direct magnetic coupling
KW - Eye location tracking
KW - Scleral search coil
KW - Triad of there-axial transmitters
UR - http://www.scopus.com/inward/record.url?scp=0141621109&partnerID=8YFLogxK
U2 - 10.1109/TBME.2003.817635
DO - 10.1109/TBME.2003.817635
M3 - Article
C2 - 14560771
AN - SCOPUS:0141621109
SN - 0018-9294
VL - 50
SP - 1174
EP - 1179
JO - IEEE Transactions on Biomedical Engineering
JF - IEEE Transactions on Biomedical Engineering
IS - 10
ER -