Flicker detection method and flicker detection apparatus
US9167175B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2014 |
| Grant date | Oct 20, 2015 |
| Priority date | — |
| Expiry date | Jul 21, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a flicker detection method and a flicker detection apparatus. The method includes: calculating the mean values of selected rows of image frames to constitute a mean value vector; calculating a differential vector between the mean value vectors of a current frame and a previous frame; calculating a DC-free difference vector; building a first square wave and a second square wave, and a third square wave and a fourth square wave; calculating a first frequency reference value; calculating a second frequency reference value; and if the difference between the first and second frequency reference values is above a threshold, then it is determined that flicker is present in the current frame; otherwise, it is determined that no flicker is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.