Color mapped and direct color OSD region processor with support for 4:2:2 profile decode function
US6642934B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2002 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Dec 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/434
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An on-screen display (OSD) processor, processing method and article of manufacture are provided having a color mapped mode, direct color mode, and 4:2:2 profile mode. The OSD processor implements both color mapped OSD region processing capability and direct color OSD region processing capability, along with an ability to store quantizer coefficients for the 4:2:2 profile mode of a video decoder coupled to the OSD processor. The capabilities of the OSD processor are implemented using a common embedded memory within the processor. During color mapped OSD region processing, color table data is temporarily stored within the embedded memory, while in direct color OSD region processing, direct color descriptions are stored within the embedded memory. When the video decoder is decoding a 4:2:2 formatted image, the embedded memory of the OSD processor is used to temporarily store inverse quantization data for the decode function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.