Combined biometrics capture system with ambient free infrared

1. An electronic device comprising:

an infrared light source to emit infrared light;

a rolling shutter sensor;

at least one processor to:

cause the rolling shutter sensor to output a first signal corresponding to a first frame of image data during exposure to the infrared light,

reset the rows of the rolling shutter sensor at a same time,

cause the rolling shutter sensor to output a second signal corresponding to a second frame of image data without exposure to the infrared light from the infrared light source,

determine a difference between the first signal and the second signal to generate an ambient infrared free frame, and

recognize a face based on the ambient infrared free frame; and

an adjustable filter, the at least one processor to change at least one of a voltage or a center frequency of the adjustable filter to switch the electronic device from a first mode to recognize a face to a second mode to detect at least one of an iris or an eye gaze.

2. The electronic device of claim 1 , further including an optical device to focus light onto the rolling shutter sensor via the pass filter.

3. The electronic device of claim 2 , wherein the at least one processor is to adjust a focal length of the optical device.

4. The electronic device of claim 1 , wherein the adjustable filter is an electrochromatic adjustable filter that is electrically adjustable to vary wavelengths that can pass through the adjustable filter.

5. The electronic device of claim 1 , wherein the adjustable filter includes an actuator and a pair of mirrors, the actuator to change a distance between the pair of mirrors to control a spectrum of light passing to the rolling shutter sensor.

6. An electronic device comprising:

means for emitting infrared light;

means for capturing video;

means for processing image data from the video, the processing means to:

cause the video capturing means to capture a first signal corresponding to a first frame of image data during exposure to the infrared light,

reset the rows of the video capturing means at a same time,

cause the video capturing means capture a second signal corresponding to a second frame of image data without exposure to the infrared light from the infrared light source,

determine a difference between the first signal and the second signal to obtain an ambient infrared free frame, and

recognize a face based on the ambient infrared free frame; and

means for filtering light, the processing means to change at least one of a voltage or a center frequency of the filtering means to switch the electronic device from a first mode to recognize a face to a second mode to detect at least one of an iris or an eye gaze.

7. The electronic device of claim 6 , further including means for focusing light onto the video capturing means.

8. The electronic device of claim 7 , wherein the processing means is to adjust a focal length of the focusing means.

9. The electronic device of claim 6 , wherein the filtering means is to vary wavelengths that can pass through the adjustable filter.

10. The electronic device of claim 6 , wherein the filtering means includes means for controlling a spectrum of light passing to the video capturing means.

11. An electronic device comprising:

an adjustable filter;

an infrared light source;

a rolling shutter sensor; and

at least one processor to execute instructions to:

detect selection of one of an iris scan mode or an eye gaze detection mode;

cause the rolling shutter sensor to output a first signal corresponding to a first frame of video during exposure to infrared light emitted by the infrared light source,

detect an iris or an eye gaze based on the first signal,

detect selection of a face recognition mode,

change at least one of a voltage or a center frequency of the adjustable filter based on a switch from the iris scan mode or eye gaze detection mode to the face recognition mode,

cause the rolling shutter sensor to output a first signal corresponding to a second frame of video during exposure to infrared light emitted by the infrared light source,

globally reset the rows of rolling shutter sensor, cause the rolling shutter sensor to output a third signal corresponding to a third frame of video without exposure to the infrared light from the infrared light source,

determine a difference between the second signal and the third signal to obtain an ambient infrared free frame, and

recognize a face based on the ambient infrared free frame.

12. The electronic device of claim 11 , further including a pass filter to filter a subset of signals transmitted through the adjustable filter.

13. The electronic device of claim 12 , further including an optical device to focus light onto the rolling shutter sensor via the pass filter.

14. The electronic device of claim 13 , wherein the at least one processor is to adjust a focal length of the optical device.

15. The electronic device of claim 11 , wherein the adjustable filter is an electrochromatic adjustable filter that is electrically adjustable to vary wavelengths that can pass through the adjustable filter.

16. The electronic device of claim 11 , wherein the adjustable filter includes an actuator and a pair of mirrors, the actuator to change a distance between the pair of mirrors to control a spectrum of light passing to the rolling shutter sensor.