Method and electronic device for eye-tracking
An eye-tracking electronic device is provided. The eye-tracking electronic device includes a scanner, at least two photodetectors configured to generate electric pulses when a scanning line reflected from a cornea is incident thereon, and at least one processor configured to generate at least one scanning line through the scanner, radiate the at least one scanning line to the cornea, and determine a direction of gaze based on time information when the at least two photodetectors generate the electrical pulses.
1. An eye-tracking electronic device comprising:
a scanner;
at least two photodetectors configured to generate electric pulses when a scanning line reflected from a cornea is incident thereon; and
at least one processor configured to:
generate at least one scanning line through the scanner,
radiate the at least one scanning line to the cornea, and
determine a direction of a gaze based on time information when the at least two photodetectors generate the electrical pulses,
wherein the scanner comprises:
a light source configured to generate the at least one scanning line;
an optical element configured to convert the at least one scanning line to form a scanning area of a linear shape, having a length from an upper eyelid to a lower eyelid, perpendicular to a scanning direction; and
a single-axis scanner mirror configured to rotate relative to one axis to move the scanning area.
2. The eye-tracking electronic device of claim 1 , wherein the light source and the optical element each rotate around at least one axis.
3. The eye-tracking electronic device of claim 1 , wherein the determining of the direction of the gaze comprises determining an angle of a position of the cornea.
4. The eye-tracking electronic device of claim 1 , wherein the at least one processor is further configured to:
digitalize the electric pulses, and
determine the direction of the gaze based on time information at which the digitalized electric pulses are generated.
5. The eye-tracking electronic device of claim 4 , wherein the at least one processor is further configured to digitalize the electric pulses by comparing the electric pulses with a set reference value.
6. The eye-tracking electronic device of claim 1 , wherein the at least one processor is further configured to determine the direction of the gaze based on a time when the electric pulses are generated respectively by the at least two photodetectors and a generation time interval.
7. The eye-tracking electronic device of claim 1 , wherein the at least one processor is further configured to determine the direction of the gaze based on a scanning speed of the scanner.
8. A method, performed by an eye-tracking electronic device, of determining a direction of a gaze, the method comprising:
generating, by a scanner, at least one scanning line;
radiating the at least one scanning line to a cornea;
generating, by at least two photodetectors, electric pulses when the at least one scanning line is reflected from the cornea to be incident thereon; and
determining the direction of the gaze based on time information when the electrical pulses are generated,
wherein the scanner comprises:
a light source configured to generate the at least one scanning line;
an optical element configured to convert the at least one scanning line to form a scanning area of a linear shape, having a length from an upper eyelid to a lower eyelid, perpendicular to a scanning direction; and
a single-axis scanner mirror configured to rotate relative to one axis to move the scanning area.
9. The method of claim 8 , wherein the scanner comprises a light source and an optical element each configured to rotate around at least one axis.
10. The method of claim 8 , wherein the determining of the direction of the gaze comprises determining an angle of a position of the cornea.
11. The method of claim 8 , wherein the determining of the direction of the gaze based on the time information when the electrical pulses are generated comprises:
digitalizing the electric pulses, and
determining the direction of the gaze based on the time information when the digitalized electric pulses are generated.
12. The method of claim 11 , wherein the digitalizing of the electric pulses comprises digitalizing the electric pulses by comparing the electric pulses with a set reference value.
13. The method of claim 8 , wherein the determining of the direction of the gaze based on the time information when the electrical pulses are generated comprises determining the direction of the gaze based on a time when the electric pulses are generated respectively by the at least two photodetectors and a generation time interval.
14. The method of claim 8 , wherein the determining of the direction of the gaze based on the time information when the electrical pulses are generated comprises determining the direction of the gaze based on a scanning speed of the scanner.
15. A computer program product comprising a non-transitory computer-readable recording medium having recorded thereon a program for executing a method, performed by an eye-tracking electronic device, of determining a direction of a gaze, the method comprising:
generating, by a scanner, at least one scanning line;
radiating the at least one scanning line to a cornea;
generating, by at least two photodetectors, electric pulses when the at least one scanning line is reflected from the cornea and is incident thereon; and
determining the direction of the gaze based on time information when the electrical pulses are generated,
wherein the scanner comprises:
a light source configured to generate the at least one scanning line;
an optical element configured to convert the at least one scanning line to form a scanning area of a linear shape, having a length from an upper eyelid to a lower eyelid, perpendicular to a scanning direction; and
a single-axis scanner mirror configured to rotate relative to one axis to move the scanning area.