Method and apparatus for conversion of dynamic range of video signals
US10594997B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 2017 |
| Grant date | Mar 17, 2020 |
| Priority date | — |
| Expiry date | Apr 20, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and device for converting a video signal from a lower dynamic range source to produce a signal usable by target devices of a higher dynamic range comprises converting with a convertor that implements a process in which a received signal is received as a luminance component and separate colour components, A modified luminance component is then produced by applying an expansion function to the luminance component for luminance values above a threshold, applying a gamma function and then applying a scaling function. The modified luminance and separate colour components are then provided as an output signal for display on a target device of a higher dynamic range. The expansion of luminance ensures that the luminance range appropriately matches the range for a target display. By applying the expansion luminance values above a threshold, values below a threshold can be maintained with appropriate values for display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.