Method of adjusting hue and device therefor
US5764308A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1996 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Jun 14, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/643
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of adjusting hue in color video signals partitions the region of all available hues into subregions in accordance with the signs of U and V components of input color video signals, which U and V signals are respectively proportional to blue-minus-luminance and red-minus luminance color-difference signals. The hue in each subregion is adjusted independently of the hues in the other subregions. Within each subregion, each of the U and V components of the input color video signals that fall therein is gain-adjusted by prescribed factors according to the subregion. A hue adjustment device determines from the signs U and V components of input color video signals which of the subregions they fall into, and adjusts the hue in each subregion to facilitate more accurate hue adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.