1. A gaze-based three-dimensional (3D) interaction system, comprising:
a display unit configured to display a 3D image having objects with different depths;
two light sources respectively aligned at both sides of said display unit to provide lights;
an image capturing unit configured to capture an image of both eyes of an operator gazing at the 3D image, the image of the both eyes of the operator showing glints formed by the lights provided from said two light sources and two pupils in the both eyes;
a first signal processing unit configured to calculate a gaze direction to which the operator is gazing at the 3D image based on positions of two glints and a pupil at one of the eyes on the image of the both eyes and a gaze depth at which the operator is gazing at the 3D image based on a distance between the two pupils in the image of the both eyes;
a second signal processing unit configured to determine a gaze of the operator on said 3D image based on the gaze direction and the gaze depth; and
a third signal processing unit configured to execute a command the operator intended according to the determined gaze.
2. The system of claim 1, wherein the light sources are infrared light emitting diodes (LED).
3. The system of claim 2, wherein the image capturing unit is a digital camera having an infrared filter attached thereto.
4. The system of claim 1, wherein the second signal processing unit selects a region corresponding to a depth related to the distance between the pupils shown by the image of the operator’s both eyes and determines the gaze of the operator within the selected region based on the gaze depth and the gaze direction.
5. A gaze-based three-dimensional (3D) interaction method, comprising:
displaying a 3D image having objects with different depths;
providing lights on both eyes of an operator gazing at said 3D image by using two light sources;
capturing an image of both eyes of the operator, the image of both eyes of the operator showing glints formed by the lights provided from said light sources and two pupils in both eyes;
calculating a gaze direction to which the operator is gazing at the 3D image based on positions of two glints and a pupil at one of the eyes on the image of both eyes and a gaze depth at which the operator is gazing at the 3D image based on a distance between the two pupils in the image of the both eyes;
determining a gaze of the operator on said 3D image based on the gaze direction and the gaze depth; and
executing a command the operator intended according to the determined gaze.
6. The method of claim 5, wherein a region corresponding to a depth related to the distance between the pupils shown by the image of the operator’s both eyes is selected, and the gaze of the operator is determined within the selected region based on the gaze depth and the gaze direction.
7. A three-dimensional (3D) gaze tracking system, comprising:
a display unit configured to display a 3D image having objects with different depths;
two light sources respectively aligned at both sides of said display unit to provide lights;
an image capturing unit configured to capture an image of both eyes of an operator gazing at a 3D image, the image of both eyes of the operator showing glints formed by the lights provided from the two light sources and two pupils in the both eyes;
a first signal processing unit configured to calculate a gaze direction to which the operator is gazing at the 3D image based on positions of two glints and a pupil at one of the eyes on the image of the both eyes and a gaze depth at which the operator is gazing at the 3D image based on a distance between the two pupils in the image of the both eyes; and
a second signal processing unit configured to determine a gaze of the operator on said 3D image based on the gaze direction and the gaze depth.
8. The system of claim 7, wherein the light sources are infrared light emitting diodes (LED).
9. The system of claim 8, wherein the image capturing unit is a digital camera having an infrared filter attached thereto.
10. The system of claim 7, wherein the second signal processing unit selects a region corresponding to a depth related to the distance between the pupils shown by the image of the operator’s both eyes and determines the gaze of the operator within the selected region based on the gaze depth and the gaze direction.
11. A three-dimensional (3D) gaze tracking method, comprising:
displaying a 3D image having objects with different depths;
providing lights on both eyes of an operator gazing at said 3D image by using two light sources;
capturing an image of both eyes of the operator showing glints formed by the lights provided from said two light sources and two pupils in the both eyes;
calculating a gaze direction to which the operator is gazing at the 3D image based on positions of two glints and a pupil at one of the eyes on the image of the both eyes and a gaze depth at which the operator is gazing at the 3D image based on a distance between the two pupils in the image of the both eyes; and
tracking a gaze of the operator on said 3D image based on the gaze direction and the gaze depth.
12. The method of claim 11, wherein a region corresponding to a depth related to the distance between the pupils shown by the image of the operator’s both eyes is selected, and the gaze of the operator is tracked based on the gaze depth and the gaze direction.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A boost circuit having an output terminal for providing an output voltage, comprising:
a first level shifter for selectively outputting either the output voltage or a first bias voltage according to a boost control signal, wherein the first bias voltage is smaller than the output voltage;
a switch circuit for determining whether to transmit a second bias voltage to the output terminal according to an output of the first level shifter, wherein the second bias voltage is greater than the first bias voltage;
a capacitance equivalent circuit having a first terminal and a second terminal, wherein the first terminal is electrically coupled to the output terminal; and
a second level shifter for selectively outputting either a third bias voltage or the first bias voltage to the second terminal of the capacitance equivalent circuit according to the boost control signal, wherein the third bias voltage is greater than the first bias voltage.
2. The boost circuit of claim 1, wherein the switch circuit comprises a PMOS transistor having a first sourcedrain receiving the second bias voltage, a gate receiving the output of the first level shifter, and a second sourcedrain electrically coupled to the output terminal.
3. The boost circuit of claim 1, wherein the capacitance equivalent circuit comprises an NMOS transistor having a gate electrically coupled to the output terminal via the first terminal, the first sourcedrain and the second sourcedrain are short circuited with each other and receiving an output of the second level shifter via the second terminal.
4. The boost circuit of claim 1, wherein the second bias voltage is provided by a pump circuit.
5. The boost circuit of claim 1, wherein a potential of the first bias voltage is equal to a ground potential.
6. The boost circuit of claim 1, wherein when the boost control signal is enabled, the first level shifter outputs the output voltage, and when the boost control signal is disabled, the first level shifter outputs the first bias voltage.
7. The boost circuit of claim 1, wherein when the boost control signal is enabled, the second level shifter outputs the third bias voltage, and when the boost control signal is disabled, the second level shifter outputs the first bias voltage.