Flash detection
US8218086B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 2007 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | May 9, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/186
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided a method of pre-processing video data to detect flashes, comprising calculating a normalized difference index value for a Luminance [Y] component of the video data, calculating a normalized difference index value for Chrominance [U and V] components of the video data, calculating a normalized luminance [Y] mean gradient index for the video data, and providing an indication that a flash has been detected when all the following conditions are satisfied: the normalized difference index value for the Luminance [Y] component is greater than a first predetermined threshold (TY); the normalized difference index value for the Chrominance [U and V] components is less than a second predetermined threshold (TC); and a difference between the normalized difference index value for the Chrominance [U and V] components and the normalized luminance [Y] mean gradient index is less than or equal to a third pre-determined threshold (TF).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.