Compensation of pixel misregistration in volume holographic data storage
AssigneeInternational Business Machines Corporation
InventorGeoffrey W. Burr
Life of this patent
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Abstract
A method of correcting errors arising from interpixel cross talk in the detection of a reconstructed holographic data image includes determining any misregistration between the pixels and the bit images. The measured output signals are then corrected to compensate for signal strength lost to or gained by nearby pixels through interference effects resulting from the misregistration, thereby producing a calculated data image that is substantially corrected for interpixel crosstalk. The relevant algorithms are provided and experimental verification is presented.
Claims23
A processor-implemented method of determining the intensities of beams of coherent electromagnetic radiation, wherein the beams form an array, comprising:
- providing an array of detectors;
- imaging the array of beams onto the array of detectors to generate output signals from the detectors;
- detecting the output signals to record respective output signal levels;
- determining misregistration between the detectors and the beams;
- and
- using a processor to correct the recorded output signal levels by compensating for electromagnetic interference effects at the detectors arising from the misregistration, so that the corrected output signals levels are proportional to those that would be recorded in the absence of misregistration.
A processor-implemented method of correcting errors arising from interpixel cross talk in the detection of a reconstructed holographic data image, the data image being comprised of a two dimensional grid of bit images arranged in rows and columns, comprising:
- providing a detection device having a grid of detector pixels, the detector pixels corresponding to and detecting the bit images;
- directing the data image onto the detector pixels by passing coherent electromagnetic radiation through a holographic storage medium;
- measuring output signals from the detector pixels;
- determining any misregistration between the pixels and the bit images;
- and
- using a processor to correct the measured output signals to compensate for signal strength lost to or gained by nearby pixels through interference effects resulting from the misregistration, thereby producing a calculated data image that is substantially corrected for interpixel crosstalk.
Dependencies are inferred from the claim text.