Efficient method and system for the acquisition of scene imagery and iris imagery using a single sensor
First Claim
Patent Images
1. A method of processing images acquired using a single image sensor, comprising:
- acquiring, by an image sensor, a first image of an object at a predetermined distance with respect to the image sensor, the first image including a time-invariant signal component corresponding to the object, and a random time-varying signal component introduced by one or more noise sources; and
processing the first image according to a selection from a first mode and a second mode, comprising;
if the first mode is selected, acquiring the first image using a first portion of the image sensor, and processing the first image acquired via the first portion by retaining signals from the time-invariant and time-varying signal components with spatial frequencies at and below a threshold spatial frequency predetermined for iris recognition, wherein the object comprises an iris; and
if the second mode is selected, acquiring the first image using a second portion of the image sensor, and processing the first image acquired via the second portion by reducing at least a portion of the signals from the time-invariant and time-varying signal components with spatial frequencies at or below the threshold spatial frequency.
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Abstract
The present disclosure is directed towards methods and systems for capturing images of an iris and a scene using a single image sensor. An image sensor may capture a view of a scene and a view of an iris in at least one image. An image processing module may apply a level of noise reduction to a first portion of the at least one image to produce an image of the scene. The image processing module may apply a reduced level of noise reduction to a second portion of the at least one image to produce an image of the iris for use in biometric identification.
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Citations
20 Claims
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1. A method of processing images acquired using a single image sensor, comprising:
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acquiring, by an image sensor, a first image of an object at a predetermined distance with respect to the image sensor, the first image including a time-invariant signal component corresponding to the object, and a random time-varying signal component introduced by one or more noise sources; and processing the first image according to a selection from a first mode and a second mode, comprising; if the first mode is selected, acquiring the first image using a first portion of the image sensor, and processing the first image acquired via the first portion by retaining signals from the time-invariant and time-varying signal components with spatial frequencies at and below a threshold spatial frequency predetermined for iris recognition, wherein the object comprises an iris; and if the second mode is selected, acquiring the first image using a second portion of the image sensor, and processing the first image acquired via the second portion by reducing at least a portion of the signals from the time-invariant and time-varying signal components with spatial frequencies at or below the threshold spatial frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for processing images acquired using a single image sensor, the apparatus comprising:
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an image sensor configured to; acquire a first image of an object at a predetermined distance with respect to the image sensor, the first image including a time-invariant signal component corresponding to the object, and a random time-varying signal component introduced by one or more noise sources; and an image processing engine configured to process the first image corresponding to a selection from a first mode and a second mode, the image processing module configured to; if the first mode is selected, process the first image acquired via a first portion of the image sensor by retaining signals from the time-invariant and time-varying signal components with spatial frequencies at and below a threshold spatial frequency predetermined for iris recognition, wherein the object comprises an iris; and if the second mode is selected, process the first image acquired via a second portion of the image sensor by reducing at least a portion of the signals from the time-invariant and time-varying signal components with spatial frequencies at or below the threshold spatial frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification