Method and apparatus for providing strobed image capture
First Claim
Patent Images
1. A computer implemented method for providing strobed image capture, comprising:
- controlling, with an illumination controller, at least one strobed illumination source to limit an amount of radiation from the illumination source that is applied to an iris of a subject;
synchronizing, with the illumination controller, at least one camera with the strobed illumination source;
strobing the at least one strobed illumination source with the illumination controller for a series of short pulses over a period of time having an intensity that is greater than a threshold limit value for a continuous wave output of the at least one strobed illumination source over the period of time; and
capturing at least one image of the iris with the at least one camera, the iris being illuminated at least in part by a plurality of photons from the strobed illumination source.
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Abstract
A method and apparatus for strobed image capture includes stroboscopic illumination synchronized with one or more cameras to improve a signal to noise ratio, reduce motion blur and avoid object damage in sensor systems used to analyze illumination sensitive objects.
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Citations
31 Claims
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1. A computer implemented method for providing strobed image capture, comprising:
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controlling, with an illumination controller, at least one strobed illumination source to limit an amount of radiation from the illumination source that is applied to an iris of a subject; synchronizing, with the illumination controller, at least one camera with the strobed illumination source; strobing the at least one strobed illumination source with the illumination controller for a series of short pulses over a period of time having an intensity that is greater than a threshold limit value for a continuous wave output of the at least one strobed illumination source over the period of time; and capturing at least one image of the iris with the at least one camera, the iris being illuminated at least in part by a plurality of photons from the strobed illumination source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for providing strobed image capture, comprising:
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at least one camera; at least one illumination controller for synchronizing with the at least one camera at least one illumination source for illuminating an iris of a subject with a plurality of photons; wherein the at least one captures at least one image of the iris at least in part from the plurality of photons reflected from the iris; and wherein the illumination controller is configured to strobe the at least one illumination source for a series of short pulses over a period of time having an intensity that is greater than a threshold limit value for a continuous wave output of the at least one illumination source over the period of time. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A system for performing iris recognition, comprising:
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at least one camera arranged to define an image capture volume and configured to capture a plurality of images of a subject moving through the image capture volume, wherein at least one of the plurality of images contains at least a portion of an iris; an illumination source; a controller coupled to the illumination source and the at least one camera, the controller configured to provide illumination of the subject during operation of the at least one camera; and a processor for processing at least one of the plurality of images containing at least a portion of an iris to perform iris recognition; wherein the controller is configured to strobe the illumination source; and wherein a light intensity of the illumination source is increased during a strobe, while an average irradiance of the illumination source remains below a safety threshold. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification