Systems and methods for lensless image acquisition
AssigneeRambus Inc.
InventorPatrick R. Gill
Life of this patent
Estimating the term…
Abstract
Image-sensing devices include odd-symmetry gratings that cast interference patterns over a photodetector array. Grating features offer considerable insensitivity to the wavelength of incident light, and also to the manufactured distance between the grating and the photodetector array. Photographs and other image information can be extracted from interference patterns captured by the photodetector array. Efficient extraction algorithms based on Fourier deconvolution introduce barrel distortion, which can be removed by resampling using correction functions. The sensing devices can be made to minimize distortion that results from efficient extraction algorithms based on Fourier deconvolution.
Claims26
1-7. (canceled)
A system for imaging a scene, the system comprising:
- a photodetector array;
- a phase grating overlying the photodetector array, the phase grating to produce a diffraction pattern from the scene;
- memory to store a deconvolution function corresponding to a point-spread function of the phase grating;
- a sensor array to capture a digital sample of the diffraction pattern;
- and
- a processor coupled to the sensor array and the memory, the processor to:
- deconvolve the digital sample of the diffraction pattern with the point-spread function to obtain distorted image data;
- and
- resample the distorted image data to obtain a reduced-distortion image of the scene.
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A system for imaging a scene in a first medium of a first refractive index, the system comprising:
- a phase-shift layer of a second refractive index having a first surface to face the scene and a second surface opposite the first surface and including a grating to produce a diffraction pattern from the scene;
- and
- a photodetector array spaced from the phase-shift layer opposite the second surface, the photodetector array to sample the diffraction pattern;
- wherein the photodetector array is separated from the phase-shift layer by a second medium of the first refractive index.
32-39. (canceled)
Dependencies are inferred from the claim text.