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US 2014/0270565 A1Published application
Measurement of wave-front aberration in a small telescope remote imaging system using scene-based wave-front sensing
AssigneeLawrence Livermore National Security, LLC
InventorsLisa A. Poyneer, Brian J. Bauman
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Abstract
Reference-free compensated imaging makes an estimation of the Fourier phase of a series of images of a target. The Fourier magnitude of the series of images is obtained by dividing the power spectral density of the series of images by an estimate of the power spectral density of atmospheric turbulence from a series of scene based wave front sensor (SBWFS) measurements of the target. A high-resolution image of the target is recovered from the Fourier phase and the Fourier magnitude.
Claims14
A method, comprising:
- estimating the Fourier phase of a series of images of a target;
- estimating the Fourier magnitude of said series of images by dividing the power spectral density of said series of images by an estimate of the power spectral density of atmospheric turbulence from a series of scene based wave front sensor (SBWFS) measurements of said target;
- and
- recovering a high-resolution image of said target from said Fourier phase and said Fourier magnitude.
1 more element
A method, comprising:
- acquiring a series of images of a target and a series of scene based wave front sensor (SBWFS) measurements of said target;
- estimating the Fourier phase of said series of images of said target;
- computing a first power spectral density (first PSD) from said series of images;
- calculating slopes from said SBWFS measurements;
- estimating wavefronts from said slopes;
- estimating atmospheric PSD from said wave fronts to produce a second PSD;
- dividing said first PSD by said second PSD to produce an estimate of the Fourier magnitude of said series of images;
- combining said Fourier phase and said Fourier magnitude to produce a complex signal;
- and
- recovering a high-resolution image of said target by performing an inverse Fourier transform on said complex signal.
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An apparatus, comprising:
- means for acquiring a series of images of a target and a series of scene based wave front sensor (SBWFS) measurements of said target;
- a computer readable storage medium comprising executable instructions written onto said storage medium, wherein said executable instructions comprise the steps of:
- estimating the Fourier phase of said series of images of said target;
- computing a first power spectral density (first PSD) from said series of images;
- calculating slopes from said SBWFS measurements;
- estimating wavefronts from said slopes;
- estimating atmospheric PSD from said wave fronts to produce a second PSD;
- dividing said first PSD by said second PSD to produce an estimate of the Fourier magnitude of said series of images;
- combining said Fourier phase and said Fourier magnitude to produce a complex signal;
- and
- recovering a high-resolution image of said target by performing an inverse Fourier transform on said complex signal.
8 more elements
Dependencies are inferred from the claim text.