Method of and system for block-by-block data retrieval for optical storage
OwnerBunsen Fan, Sadeg M. Farisinventors
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Abstract
The above-discussed and other problems and deficiencies of the prior art are overcome or alleviated by the several methods and apparatus of the present invention for a block-by-block data retrieval method and system, wherein the data is stored in a multiple layer polarization selective, wavelength selective, or a combination of polarization selective and wavelength selective films.
Claims6
A method of data retrieval comprising:
- illuminating a multiple film stack of polarization dependant films, each film having plural regions of reflectance and/or non-reflectance corresponding to data marks, the reflected light including a plurality of such regions;
- splitting reflected light into a pair light signals of polarizations states P1 and P2;
- separately imaging the pair light signals of polarizations states P1 and P2 to form a P1 image and a P2 image;
- and
- processing the P1 image and the P2 image to derive data.
A method of data retrieval comprising:
- illuminating a multiple film stack of wavelength dependant films, each film having plural regions of reflectance and/or non-reflectance corresponding to data marks, the reflected light including a plurality of such regions;
- splitting reflected light into a pair light signals of wavelength bands λ1 and λ2;
- separately imaging the pair light signals of wavelength bands λ1 and λ2 to form a λ1 image and a λ2 image;
- and
- processing the λ1 image and the λ2 image to derive data.
A method of block-by-block data retrieval for optical storage comprising:
- capturing raw image data with a sensor;
- filtering said image for noise reduction;
- correcting image distortions;
- rotating and translating said image;
- binary data mapping;
- and
- decoding said data, wherein said data is retrieved.
An apparatus for block-by-block data retrieval comprising:
- a stack of polarization selective films that store data;
- a light illumination subsystem that illuminates the stack;
- an objective optics that illuminates the film stack and collects the reflected signal light from the film stack;
- a polarization beam splitter that separates the reflected signals into a pair of orthogonal polarized signals;
- and
- a plurality of image processors for each of the pair of orthogonal polarized signals, wherein said pair of orthogonal polarized signals are separated into two images.
An apparatus for block-by-block data retrieval comprising:
- a stack of wavelength dependant films that store data;
- a light illumination subsystem that illuminates the stack;
- an objective optics that illuminates the film stack and collects the reflected signal light from the film stack;
- a wavelength de-multiplexer that separates the reflected signals into a plurality of signals having different wavelength bands;
- and
- a plurality of image processors for the wavelength-demultiplexed signals, wherein said de-multiplexed signals are separated into two images.
An apparatus for block-by-block data retrieval comprising:
- a stack of chiral films that store data;
- a light illumination subsystem that illuminates the chiral stack;
- an objective optics that illuminates the film stack and collects the reflected signal light from the chiral film stack;
- a wavelength de-multiplexer that separates the reflected signals into a plurality of signals, according to the signal wavelength;
- and
- a plurality of image processors for the wavelength-demultiplexed signals,
- wherein said plurality of de-multiplexed signals are each separated into two images, according to the polarization, P1 and P2, which are orthogonal to each other.
Dependencies are inferred from the claim text.