Picture-signal processing apparatus and method using weighting for black-level control
US7027098B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2002 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Jul 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digitized luminance signal, representing the luminance component of a picture signal, is adjusted according to data stored in a memory. The data are output according to the value of the digitized luminance signal and multiplied by a weighting signal generated according to the amount of black area represented by the digitized luminance signal. The digitized luminance signal is then multiplied by a value obtained from the weighted product data. Use of the weighting signal enables the luminance scale to be stretched and compressed according to various different control characteristics without the need to store separate data for each characteristic in the memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.