Measurement of relative detector gain
US5302824A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Dec 1, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An imaging system including a scanning linear detector array is calibrated with the aid of a source of radiation to provide uniformity in gain among the various detectors of the array. A first memory is provided for storing a map of the source obtained by a scanning through a succession of parallel line scans by means of a single one of the detectors, the detector array being offset between the successive line scans to enable the single detector to perform all of the line scans. A second memory is provided to store an image of the source provided by a scanning by all of the detectors along their respective scan lines. The data obtained in each line scan in each of the memories is averaged. Then, the average value for a scan line stored in the second memory is divided by the average value of the same scan line appearing in the first memory to provide a ratio for each scan line. The ratio is the gain of the detector of the scan line relative to the gain of the first detector. The mapping allows equalization of the gains for eliminating the effect of nonuniformities of the test source from the resultant calculation of the relative detector gains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.