Image shifting apparatus for enhanced image resolution
First Claim
1. A method of enhancing resolution of an image, the method comprising:
- providing a photodetector;
capturing a first image at a first pixel position on the photodetector;
integrating a signal from a vibration sensor to determine image shift due to motion of an optical element;
calculating an amount of offset for an optical compensator to shift the first image a predetermined sub-pixel amount including the image shift due to the motion of the optical element;
providing a sub-pixel offset signal to the optical compensator in the calculated amount of the offset;
moving the optical compensator to form at least one additional image at a second pixel position offset from the first pixel position by a sub-pixel offset distance;
capturing the at least one additional image;
comparing the first image to the at least one additional image;
in response to the comparison of the first image and the at least one additional image, deriving an enhanced resolution image; and
identifying an edge in the enhanced resolution image, the edge having varying intensities based on the comparison of the first image and the at least one additional image;
determining a region of peak intensity for the edge of the enhanced resolution image; and
in response to the determination of the region of peak intensity, enhancing a resolution of the edge by narrowing the edge to the peak intensity region.
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Abstract
An image shifting apparatus may capture multiple frames of an image, with each frame offset by a sub-pixel offset distance. After capture, the various sub-pixel offset images may be registered together and analyzed using known resolution enhancement algorithms. Super resolution algorithms, for example. may take the various frames and perform edge identification and peak extraction routines to improve the resolution of high frequency data within an image. The image shifting apparatus may include an actuation controlled optical compensator within the imaging system that may be adjusted to create a sub-pixel offset image of an original reference image. The optical compensator may be an image-stabilizing element, for example, capable of forming sub-pixel shifts in an image plane.
56 Citations
12 Claims
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1. A method of enhancing resolution of an image, the method comprising:
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providing a photodetector; capturing a first image at a first pixel position on the photodetector; integrating a signal from a vibration sensor to determine image shift due to motion of an optical element; calculating an amount of offset for an optical compensator to shift the first image a predetermined sub-pixel amount including the image shift due to the motion of the optical element; providing a sub-pixel offset signal to the optical compensator in the calculated amount of the offset; moving the optical compensator to form at least one additional image at a second pixel position offset from the first pixel position by a sub-pixel offset distance; capturing the at least one additional image; comparing the first image to the at least one additional image; in response to the comparison of the first image and the at least one additional image, deriving an enhanced resolution image; and identifying an edge in the enhanced resolution image, the edge having varying intensities based on the comparison of the first image and the at least one additional image; determining a region of peak intensity for the edge of the enhanced resolution image; and in response to the determination of the region of peak intensity, enhancing a resolution of the edge by narrowing the edge to the peak intensity region. - View Dependent Claims (2, 3, 4)
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5. An article comprising a machine-accessible medium having stored thereon instructions that, when executed by a machine, cause the machine to:
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capture a first image at a first pixel position; integrate a signal from a vibration sensor; provide a sub-pixel offset signal to an optical compensator based on a requested image shift and an amount of image shift calculated from the vibration sensor; move the optical compensator to form at least one additional image at a second pixel position offset from the first pixel position by a sub-pixel offset distance; capture the at least one additional image; compare the first image to the at least one additional image; in response to a comparison of the first image and the at least one additional image, derive an enhanced resolution image; identify an edge in the enhanced resolution image, the edge having varying intensities based on the comparison of the first image and the at least one additional image; determine a region of peak intensity for the edge of the enhanced resolution image; and in response to the determination of the region of peak intensity, enhance a resolution of the edge by narrowing the edge to the peak intensity region. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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Specification