BIOMETRIC IMAGE OPTIMIZATION USING LIGHT FIELDS
First Claim
1. A method of optimizing a single image of a biometric parameter, comprising:
- capturing an image of the biometric parameter having at least one of image portions that are in different focal planes and image portions that are viewable from different viewing angles;
forming a single image includes forming multiple views of the biometric parameter wherein each one of the multiple views comprises a different combination of at least one of a focal plane and a viewing angle; and
processing the multiple views to create a single improved image of the biometric parameter with the image portions all in focus and including information from multiple viewing angles.
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Abstract
The application of light field imaging in the capture of biometric images enables image processing to use continuous focus adjustment of a single image to construct an image of a biometric feature that is in focus across an expanded depth of field. Because a single image is the source of all information, the final image is formed without requiring combination of multiple images that may have physically moved between capture of the images. Light field imaging can be accomplished through multiple methods including plenoptic cameras or focus stacking cameras. The use of near infrared wavelengths in images captured using light fields optimizes the deployment of biometric systems by eliminating intense visible light currently implemented to capture some biometrics. The use of near infrared wavelengths for light field imaging enhances iris capture as the iris display more useful characterization under near infrared illumination.
8 Citations
15 Claims
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1. A method of optimizing a single image of a biometric parameter, comprising:
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capturing an image of the biometric parameter having at least one of image portions that are in different focal planes and image portions that are viewable from different viewing angles; forming a single image includes forming multiple views of the biometric parameter wherein each one of the multiple views comprises a different combination of at least one of a focal plane and a viewing angle; and processing the multiple views to create a single improved image of the biometric parameter with the image portions all in focus and including information from multiple viewing angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification