Palm scanner using a programmable nutating mirror for increased resolution
First Claim
1. A method for increasing image resolution in a palm print scanner, comprising the steps of:
- (1) synchronizing a nutating mirror with a camera frame sync;
(2) scanning a frame of an image at a first nutation position;
(3) positioning the nutating mirror by a fraction of a pixel amount in one direction to obtain a next nutation position;
(4) scanning the frame of another image at the next nutation position;
(5) repeating steps (3) and (4) until an image is obtained for each nutation position needed; and
(6) mapping sub-pixels from each of the images obtained in steps (2), (4), and (5) to an image of pixels having a higher resolution than the respective images of sub-pixels.
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Accused Products
Abstract
A system and method for increasing image resolution in a palm print scanner. The method of the invention requires the synchronization of a nutating mirror with a camera frame sync. A first image is scanned at a first nutation position. The mirror is nutated by a fraction of a pixel amount in one direction. Another image is scanned at a second nutation position. The process of nutating the mirror to a different nutation position and scanning an image is repeated until all sub-pixels needed to increase an image resolution are obtained. All of the sub-pixels obtained are then interlaced to obtain a higher resolution image.
106 Citations
8 Claims
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1. A method for increasing image resolution in a palm print scanner, comprising the steps of:
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(1) synchronizing a nutating mirror with a camera frame sync;
(2) scanning a frame of an image at a first nutation position;
(3) positioning the nutating mirror by a fraction of a pixel amount in one direction to obtain a next nutation position;
(4) scanning the frame of another image at the next nutation position;
(5) repeating steps (3) and (4) until an image is obtained for each nutation position needed; and
(6) mapping sub-pixels from each of the images obtained in steps (2), (4), and (5) to an image of pixels having a higher resolution than the respective images of sub-pixels. - View Dependent Claims (2)
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3. A palm print imaging system, comprising:
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a light emitting diode (LED);
an illuminator mirror;
a condenser lens;
a conformable prism, wherein said LED, said illuminator mirror, and said condenser lens provide color illumination to said conformable prism to obtain an image reflected from said conformable platen;
plurality of mirrors;
a nutating mirror, wherein said plurality of mirrors direct said image to said nutating mirror;
a driver for controlling said nutating mirror; and
a camera for capturing said image, wherein said camera provides signals to said driver to synchronize said nutating mirror with camera frame syncs. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification