Method of obtaining an image
US7760264B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 2002 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Nov 14, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of creating an image 4 obtained from say a camera 1 to obtain a substantially linear representation of the brightness of the image includes, for each of a set of pixels (x, y) in a two dimensional array, calculating, in a computer 3, an estimate of the true image intensity (ixy) as a weighted average of n samples of the apparent image intensity (vn,xy). This is calculated as:where vn,xy is the apparent intensity measured, Tn is the exposure time, K is the gain of the system, C is an offset and wn,xy is a weighting factor which is defined to maximize the signal to noise ratio and discard insignificant, that is saturated or near zero, values. Thereafter each of the values îxy is saved together with other data representing the image 4, before the image is output to a display 5 or to a printing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.