Background correction for birefringence measurements
US11341620B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2020 |
| Grant date | May 24, 2022 |
| Priority date | — |
| Expiry date | May 5, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0009
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
One example provides a computer-implemented method for reading data stored as birefringence values in a storage medium. The method comprises acquiring an image of a voxel of the storage medium, applying a first low-pass filter with a first cutoff frequency to the image of the voxel to obtain a first background image, applying a second low-pass filter with a second cutoff frequency to the image of the voxel to obtain a second background image, the second cutoff frequency being different than the first cutoff frequency, determining an enhanced background image from the first background image and the second background image, determining birefringence values for the enhanced background image, determining birefringence values for the image of the voxel, and correcting the birefringence values for the image of the voxel based upon the birefringence values for the enhanced background image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.