26 September 2007 New approaches to image super-resolution beyond the diffraction limit
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Abstract
By techniques described in this paper, high spatial frequencies in a scene that are beyond the diffraction limit of an optical system can modulate user-generated low spatial frequency patterns prior to image formation and detection. The resulting low spatial frequency modulations or "moiré patterns" lie within the optical pass-band and will therefore be detectable. In favorable and controlled situations the scene's high spatial frequencies can be reconstructed from multiple images containing these low-frequency modulations and a single super-resolved image is synthesized. This approach to image super-resolution is feasible and does not violate well-established physical principles. The paper describes two phases of this ongoing research. In phase one, we investigate active remote imaging methods in which the low-frequency modulations are produced by controlling active illumination patterns projected onto the scene. In phase two we investigate passive remote imaging methods in which diffracting structures are interposed between the scene and the camera to modulate the light fields prior to image formation and detection.
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Eamon Barrett, David W. Tyler, Paul M. Payton, Katharine Ip, David N. Christie, "New approaches to image super-resolution beyond the diffraction limit", Proc. SPIE 6712, Unconventional Imaging III, 67120D (26 September 2007); doi: 10.1117/12.731414; https://doi.org/10.1117/12.731414
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