Remote biometric identification and lighting
A biometric capture device is operative to adjust one or more environmental parameters to enhance a range (e.g., distance) at which a biometric may be captured from a subject. For example, a sample biometric capture device may be, include, or otherwise incorporate a retinal or iris scanner configured to capture an image of the retina or iris (e.g., a biometric) when the retina or iris is illuminated by infrared light. Generally, the amount of infrared light required to accurately image the retina or iris increases with the distance of the subject's retina or iris from the image capture device. The biometric capture device may capture a facial image using a first image sensor, identify a face in the facial image, capture an iris image using a second image sensor guided by the facial image, and identify a person using the iris image.
1. An apparatus for remote capture of a biometric during movement, comprising:
a first image sensor to capture an image of a person;
a detector configured to detect a distance to the person;
an emitter configured to adjust an environmental parameter that comprises at least one of light, an intensity of the light, a focus of the light, an amount of the light, or a frequency of the light;
a processor operative to determine whether the image includes a face; and
a second image sensor operable to capture an iris image or a retina image of the person; wherein the processor:
determines a speed of the person using the distance;
determines a first time based on the speed when the second image sensor can capture the iris image or the retina image of the person at a first position if the environmental parameter is adjusted;
estimates a subsequent position of the person at a second time based on the speed;
causes the emitter to adjust the environmental parameter at the first time;
causes the second image sensor to capture the iris image or the retina image of the person at the first time; and
uses the face to guide capture of the iris image or the retina image.
2. The apparatus of claim 1 , wherein the processor is operative to:
determine a level of the environmental parameter based on the distance to the person; and
instruct the emitter to adjust the environmental parameter based on the distance.
3. The apparatus of claim 2 , wherein:
the emitter comprises a visible light emitter and an infrared emitter;
the processor uses the visible light emitter to adjust visible light during capture of the image using the first image sensor; and
the processor uses the infrared emitter to adjust infrared light during capture of the iris image or the retina image.
4. The apparatus of claim 3 , wherein the visible light emitter is a white light emitter.
5. The apparatus of claim 2 , wherein:
the emitter comprises a visible light emitter; and
the processor uses the visible light emitter to adjust visible light during capture of the image using the first image sensor.
6. The apparatus of claim 2 , wherein:
the emitter comprises an infrared emitter; and
the processor uses the infrared emitter to adjust infrared light during capture of the iris image or the retina image.
7. The apparatus of claim 1 , wherein:
the iris image or the retina image of the person is a first iris image or a first retina image of the person;
the emitter adjusts the environmental parameter a first amount at the first time;
the processor determines that the second image sensor can capture a second iris image or a second retina image of the person at the second time if the environmental parameter is adjusted a second amount;
the processor causes the emitter to adjust the environmental parameter the second amount at the second time; and
the processor causes the second image sensor to capture the second iris image or the second retina image of the person at the second time.
8. The apparatus of claim 1 , wherein the first image sensor and the second image sensor have a different number of megapixels.
9. The apparatus of claim 1 , wherein the second image sensor has square pixels.
10. The apparatus of claim 1 , wherein the processor uses a focus table to dynamically determine depth of field when using the second image sensor to capture the iris image or the retina image of the person.
11. The apparatus of claim 1 , further comprising a security scanning apparatus operable to detect at least one of contraband, a metal, or an explosive.
12. The apparatus of claim 1 , wherein the second image sensor has greyscale pixels.
13. The apparatus of claim 1 , wherein the second image sensor has black and white pixels.
14. The apparatus of claim 1 , wherein the second image sensor has an autofocus lens.
15. A system for remote capture of a biometric during movement, comprising:
at least one image sensor to capture an image of a person;
a detector configured to detect a distance to the person;
an emitter configured to adjust an environmental parameter that comprises at least one of light, an intensity of the light, a focus of the light, an amount of the light, or a frequency of the light; and
a processor operative to:
determine whether the image includes a face;
determine a speed of the person using the distance;
determine a first time based on the speed when the at least one image sensor can capture an iris image or a retina image of the person at a first position if the environmental parameter is adjusted;
determine a subsequent position of the person at a second time based on the speed;
control the emitter to adjust the environmental parameter at the first time; and
use the at least one image sensor to capture the iris image or the retina image of the person using the face at the first time.
16. The system of claim 15 , wherein the processor uses the face to determine a location of an iris or a retina.
17. The system of claim 15 , wherein the at least one image sensor captures the image of the person during the movement.
18. The system of claim 15 , wherein the at least one image sensor captures the iris image or the retina image of the person during the movement.
19. The system of claim 15 , wherein the processor uses the emitter to adjust the environmental parameter based on the distance to the person.
20. The system of claim 19 , wherein:
the iris image or the retina image of the person is a first iris image or a first retina image of the person;
the emitter adjusts the environmental parameter a first amount at the first time;
the processor determines that the at least one image sensor can capture a second iris image or a second retina image of the person at the second time if the environmental parameter is adjusted a second amount;
the processor causes the emitter to vary the environmental parameter from the first amount to the second amount at the second time; and
the processor causes the at least one image sensor to capture the second iris image or the second retina image of the person at the second time.