Barrel-based white balance filter
US9350964B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Mar 25, 2014 |
| Grant date | May 24, 2016 |
| Priority date | — |
| Expiry date | Jul 18, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/55
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A barrel-based white balance filter includes an opaque barrel attachable to a camera lens of a camera and a white balance component in the form of a milky white or gray filter having a milky white or gray annular rim and axially adjustably mounted in the opaque barrel so that the milky white or gray annular rim is protected by the opaque barrel against the radiation of vivid light or reflected light during a manual white balance operation when the white balance component is completely received in the opaque outer barrel, enabling the manual white balance system of the camera to measure the average white balance value of the viewing scene accurately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.