Calibration and error correction in multi-channel imaging
US7079251B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 2003 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Jul 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B2290/70
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multi-channel imaging system is calibrated by measuring the geometric distortion in each sub-image, generating corresponding correction factors, and applying such factors to correct subsequent image data. In addition, intensity transfer-function arrays are measured at each pixel, and further used to correct for system and detector nonlinearities and nonuniformity between images. The procedure is repeated over a range of wavelengths to produce a complete set of correction coefficients and transfer functions. When the system is used for interferometric phase measurements, multiple measurements are preferably taken and a random phase offset in the reference path length is introduced at each measurement. The multiple phase data so derived are then averaged to reduce phase-dependent systematic measurement errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.